1. lng装卸操作视频汽车改液化气不能加民用液化气。 液化气罐的接口管径与灌装天然气的加气枪也不一样,无法通用,即使经过改装,天然气公司的人也不会给用户加的,家用燃气为LNG而车用燃气是CNG。 煤气罐中是液化石油气,主要成分为丙烷、丙烯、丁烷、丁烯等,而煤气其主要成分是一氧化碳、甲烷和氢等。两者有相似的地方,但是还是有一定区别的。 2. lng装卸车视频上进液可以使上不压力将下来,使得LNG槽车卸车时越卸越快,下进液可以使得LNG直接进入储罐底部。没有从上到下的挥发过程,卸车比较平稳缓慢。如果罐位比较低时候,建议你用下进,尽量保证进多少存多少。但是若有不同组分的LNG进一组罐时,车上比储罐密度小下进,密度大上进,防止翻滚! 3. lng装车流程视频一、竣工验收检查 建设项目是否经过消防验收合格。 二、消防安全管理检查 1.是否落实站区现场火源管理,是否存在加油加气区内吸烟、营业期间动用明火等违规现象,辅助服务区内是否存在新增明火或散发火花地点,设在加油加气区内的站房内是否存在明火设备。 2.是否严格落实动火审批制度,因设备检修等情况必须动用明火时是否停止加油加气作业,并采取提前清理置换罐体、管道油气、清除可燃物等可靠安全措施。 3.是否在站区内设置了“严禁烟火”等醒目的消防安全标识,加油加气区与辅助服务区之间是否设有明显界线标识。 4.是否按照操作规程进行卸油、加油(气)等作业。 5.是否在操作中落实防静电措施。 6.是否对现场开展防火巡查检查,及时发现并处置“跑、冒、滴、漏”现象。 7.是否按要求定期对消防设施器材和防静电装置进行检查、维修、保养,固定消防设施是否按要求每年至少进行一次全面检测。 8.是否定期对防静电接地装置进行检测。 9.是否按要求委托有相应资质的防雷装置检测机构对防雷设施进行定期检测,查阅检测报告结论是否为合格。 10.可燃气体浓度探测装置的报警阈值是否每年由当地质量技术监督部门进行检定,并查阅检定证书。 11.是否结合站内具体情况(针对储罐区、加油加气区、压缩机、站房等不同部位起火的情况)制定了灭火和应急疏散预案。 二、建筑防火检查 (一)平面布局检查 1.站内的储罐、加油机和液化石油气、压缩天然气工艺设施等部位,与站外建、构筑物的防火间距是否存在变化。 2.站内各建筑和设施的状态是否改变。 3.加油加气作业区内是否存在违规设置住宿、餐饮、商场(不含经营食品、饮料、润滑油、汽车配件等小商品的便利店)和娱乐等设施的现象,辅助服务区内的服务设施是否与加油加气作业区保持足够防火间距。 4.是否存在超量储存的现象。 5.站区内是否违规采用沥青路面。 6.站内是否存在违规种植的油性植物,液化石油气加气站内是否违规种植有树木和易造成可燃气体积聚的其他植物。 7.加油加气作业区内,是否有“明火地点”或“散发火花地点”。 (二)防火分隔检查 1.小型内燃发电机组的废气排出口是否安装有阻火器,排烟管口至各爆炸危险区域边界的水平距离是否符合以下规定:当排烟口高出地面4.5m以下时,不应小于5m;当排烟口高出地面4.5m及以上时,不应小于3m。 2.加油加气站内是否按规定采用明沟排水,围墙处设置的水封装置是否正常。 3.位于爆炸危险区域内的操作井、排水井的防渗漏和防火花发生的措施是否到位。 4.站房与餐厅、汽车服务、锅炉房、厨房、员工宿舍、司机休息室等设施之间是否以无门窗洞口的实体防火墙分隔。 5.站内的锅护房、厨房等有明火设备的房间与工艺设备之间的距离符合防火间距的规定但≤25m时,其朝向加油加气作业区的外墙是否为无门窗洞口的实体防火墙。 6.加油站内的工艺管道除必须露出地面的以外,是否均已埋地敷设。当采用管沟敷设时,管沟是否用中性沙子或细土填满、填实。 (三)电气防爆、防雷、防静电措施检查 1.检查站内罩棚、泵房、压缩机间、营业室等部位设置的事故照明是否正常。 2.爆炸危险区域内电器设备选型、电气线路敷设是否符合防爆要求。 3.储罐(瓶组)防雷防静电接地是否完好,接地点是否不少于2处。 4.埋地储罐与量油孔、通气管、放散管及阻火器、油罐车御油用的卸油软管、油气回收软管与两端快速接头等附件相互间的电气连接是否良好。 5.油品和液化石油气卸车场地,是否设置接地装置、跨接线及静电接地仪。 6.爆炸危险区域内的油、气管道上的法兰、胶管两端的金属线跨接是否保持完好。 7.当采用电缆沟敷设电缆时,加油加气作业区内的电缆沟内是否充沙填实,电缆是否违规与油品、气体管道以及热力管道敷设在同一沟内。 三、消防设施器材检查 1.检查LPG、LNG加气站及合建站设置的固定消防给水系统。 2.检查加油站的灭火器材配备。 3.检查配置的灭火器型号是否与使用环境相符;检查灭火用沙子是否保持干燥,有无结块、冰冻现象。 4.检查加气站、加油加气合建站内设置有LPG设备、LNG设备的场所和设置有CNG设备(包括罐、瓶、泵、压缩机等)的房间内、罩棚下是否按要求设置可燃气体检测器,报警功能是否正常,配备的不间断电源是否正常。 四、重点部位检查 (一)加油加气作业区 1.加油机、加气机是否违规设置在室内。 2.加气枪加气软管上是否设有拉断阀。 3.自助加油站是否设置了加油油气回收系统和视频监控系统,加油机是否设置了释放静电装置和紧急停机开关。 4.加气机附近是否设有防撞柱(栏);加气机附近安装的可燃气体探测器是否完好、正常。 5.液化石油气加气机的液相管道上是否设置能自行关闭的事故切断阀或过流阀。 6.液化石油气加气机附近是否设置有紧急切断按钮或装置。 7.压缩天然气加气机安全限压装置是否正常。 8.加油加气机内部电器选型和电气线路敷设是否符合防爆要求,防静电等电位连接和接地装置是否完好。 9.加油(气)软管是否存在软管老化、管内导静电铜丝断裂等情况。 10.现场是否存在“跑冒滴漏”现象。 11.站内紧急切断系统功能是否正常。 (二)油罐区 1.检查油罐通气管管口阻火器是否完好。 2.检查汽油罐与柴油罐是否分开设通气管,是否高出地面不小于4m,通气管公称直径是否大于50mm。 3.当采用卸油油气回收系统和加油油气回收系统时,汽油罐通气管口是否安装了机械呼吸阀。 4.检查油罐车卸油是否采用密闭卸油方式,密闭卸油管道的各操作接口处,是否设有快速接头及闷盖和明显标识。 5.油罐液位计的高液位报警及自动停止进油功能是否正常。 6.卸油时用的卸油连通软管、油气回收连通软管,是否采用导静电耐油软管或内附金属丝(网)的橡胶软管,软管有无老化、管内导致静电铜丝断裂等情况。 (三)站房内锅炉间 1.设置在站房内的锅炉间是否用耐火极限不低于3h的隔墙与其他房间隔开。 2.燃煤锅炉烟囱出口是否高出屋顶2m及以上,是否采取防止火星外逸的有效措施。 3.采暖用燃气热水器是否设有排烟系统和熄火保护等安全装置。 4. lng罐车卸车教学视频焊工操作证是焊工作业必须持有的证件,具有极强的法律效应。焊工操作证也称为焊工上岗证,是由应急管理厅(原安监局)颁发的,像身份证一样大小,是IC卡形式的。 考试基本介绍 考试介绍 焊工证属于特种作业操作证,又称熔化焊接与热切割作业操作证。证书全国通用,是由安监局进行颁发的正规证书。证书每三年一审,六年一换。证书类型(IC卡片)类似身份证。焊工操作证不分等级,一般只要是从事金属焊接切割作业(电焊、气焊、弧焊、电焊气割)等工作,都是领取同一种焊工操作证,不需要细化,证书带磁卡,全国通用。 IC卡版证书样本 国家文件明文规定企业聘用人员必须持此证,焊工等级资格证:俗称焊工等级证,是由人力资源与社会保障局简称为人社局,也就是以前我们常说的劳动局颁发的。 焊工职业共设五个等级,分别为: 初级(国家职业资格五级)中级(国家职业资格四级)高级(国家职业资格三级)技师(国家职业资格二级)高级技师(国家职业资格一级)。这个证是按照焊接工龄,技术水平的因素综合鉴定的。 报考条件 (一) 年满18周岁且符合相关工种规定的年龄要求; (二) 经医院体检合格且无妨碍从事相应特种作业的疾病和生理缺陷; (三) 初中及以上学历; (四) 符合相应特种作业需要的其他条件。 报考时间以及考试时间 不同城市考试时间不同。焊工证的报名时间是没有限定的,在任何时间都是可以报名的,报名之后需要完成培训才能参加考试。需要注意的是报名和培训需要委托给当地的定点学校,并且是当地应急管理厅指定的焊工培训机构。每个月最少两次考试,考完3天证书可查。根据报考级别不同,下证时间也会变化,一般考后3-6月下证。 科目介绍 焊工理论 1、焊工安全生产法律法规与安全管理 2、熔化焊与热切割基础知识 3、熔化焊与热切割作业危险源辨识 4、融化焊与热切割安全用电 5、化学品的安全使用 6、熔化焊与热刀割的防火防爆 7、熔化焊与热切割作业劳动生产与防护 焊工实操 科目一:安全用具使用 1、焊条电弧焊劳动保护用品的选用 2、二氧化碳含劳动保护用品的选用 3、环弧焊劳动保护用品的选用 4、气焊、气割劳动保护用品的选用 科目二:安全操作技术 1、焊条电弧焊安全操作技术 2、二氧化碳焊安全操作技术 3、镗弧焊安全操作技术 4、气焊、气割安全操作技术 科目三:作业现场安全隐患排除 判断作业现场存在的安全风险、职业危害 科目四:作业现场应急处理 1、单人徒手心肺复苏操作 2、灭火器的选择和使用 考试形式介绍 理论考试 100道题,其中60道判断题,40道单项选择题,每道题1分。满分100分80分合格,使用电脑考试,考试时间120分钟。(理论考试为电脑机考) 实操考试 四个科目,其中科目一:安全用具使用(劳动保护用品的正确选择与穿戴,20分); 科目二:安全操作技术(手工电弧焊、二氧化碳焊、氩弧焊、气焊,抽考其中一个项目,气割必考,40分); 科目三:作业现场安全隐患排除(视频看图隐患排查,20分); 科目四:作业现场应急处理(急救与灭火器的选择与使用,20分)。 满分100分80分合格,现场操作,考试时间60分钟。 证书领取 特种作业操作证有效期为6年,满3年需要复审,满6年需要换证。请在证件复审期或换证期满前60日内回学校申请复审换证。 备考方法 焊工证笔试 焊工考试作为一门职业资格考试,理论知识是是以卷面考试的形式呈现的, 试题十分专业化,这就需要我们积累足够的知识与做题量。所以经常要刷题,有句话说的好熟能生巧,考试题目都是在刷题里抽查的。平时练习的话可以用云习App,免费、方便、简单、工种多、试题多,也可以下载考证宝典,全国安排考试的,里面有国家标准题库,只要多多练习,通过率很高。 焊接的实际操作考试主要分为手焊工和焊机操作工的考试,可以根据情况来选定或者有些省份是抽取。抽取内容为:焊条电弧焊、二氧化碳气体保护焊、氩弧焊及气焊中的一项。主要就是日常工作中的一些内容,比如说能否焊出合格的焊缝,对于焊接的操作是否合理,能否选择正确的焊接设备和焊接材料以及焊出图纸要求的简单的一些管件等,人为因素还是比较大的,换句话说,只要焊接的差不多考官都会给通过的。 焊工证实操 焊条电弧焊 焊条电弧焊是利用手工操作焊条进行作业,通常能够满足平焊、立焊和仰焊等多种施工位置。由于焊条电弧焊的设备比较轻便简单、操作灵活,可以适用于任何拥有电源的地方作业。焊条电弧焊同时也是最不挑剔的焊接工艺,对于各种金属材料、厚度及结构造型没有刁钻苛刻的要求。 二氧化碳气体保护焊 二氧化碳气体保护焊简称二保焊,学名又称CO焊。CO具有氧化性,且CO来源广,价格低,所以作用于保护气体非常合适。为了保证获得良好的焊接效果,在焊接过程中需要考虑设施设备、施工工艺及焊丝选择等方面。在目前的焊接领域,CO焊已经是黑色金属材料的最重要焊接方式,同时,在工艺上也能够取代大部分的焊条电弧焊及埋弧焊。 氩弧焊 氩弧焊是升级版的电弧焊,利用氩气保护金属焊接材料,在作业中,高电流可以让焊接材料在被焊接材料商熔化形成熔池,达到冶金结合的技术。在高温热熔焊接的过程中不断输入氩气,断绝了焊接材料和空气接触,能够防止焊材的氧化,所以对于铜、合金。铝等有色金属来说,氩弧焊是最为合适的焊接工艺。 气焊 气焊是通过气体产生火焰将两个材料的接头熔化部分位置,再添加填充金属,等熔池冷却凝固后,两个材料形成一个整体的焊接手法。气焊的工具设备很简单,通用性比较大,对厚度薄、体量小的焊接材料作业时不易烧穿,在无电源的情况下也能够使用,所以气焊的应用环境相当广泛,不仅运用在在管道和薄壁机械的制造和安装,而且还能运用于小体量的机件和铸件的修复。 焊证考试的技巧口诀是焊接人机料法环,操作技艺占为先。手脑合一最重要,切忌浮躁心不专。右手僵硬是大忌,内旋外旋施时变。纵横并进三方向,牢记焊接三要点。焊前组对按规范,焊条质优且要干。引燃电弧有技巧,划擦撞击可任选等等。 实操考核方面,需要注意的点: 1、焊接时焊条的直径应根据工件的厚度、接头的形式、焊接位置和焊接层数、焊接电流的大小来选择 对于非平焊位置焊和开槽多层焊的第一层,应使用直径较小的焊条;立焊、水平焊和仰焊使用比平焊更小的电极;厚板使用更厚但不合适的电极 超过板厚。 2、收弧时注意填满弧坑 常用的焊缝收弧方法有:圆弧收弧、反复断弧和收弧、收弧外弧重焊收弧等。当一个焊道完成后,如果立即断弧,会在焊接面下方形成弧坑;弧坑过深不仅影响外观,还会削弱端部的强度,容易造成应力集中或形成弧坑裂纹。 3、引弧方式一般有:划痕引弧法和直接引弧法 操作时用力要适中,行程或行程要干净利落。否则,如果引弧动作过快或电极抬高过高,难以建立稳定的电弧,启动后电弧可能会熄灭;如果引弧动作过慢,电极和工件会粘在一起,造成长期短路。使焊条过热发红,引起药效如果皮肤脱落,则无法建立稳定的电弧。 4、对于大间隙,一般采用三点焊,并应注意焊道的焊接顺序 除了铸铁嵌件的焊接外,金属填料不适合大多数大型焊接,因为不可避免地会出现熔深不足的缺陷,焊脚的增加会影响焊件的强度。 5、避免磁偏吹 直流电弧最大的缺点是电弧会被磁吹,导致电弧不稳定,严重时无法焊接,尤其是大电流、深坡口、角焊。避免磁偏吹的措施包括:使用交流电源进行焊接,正确选择电缆接入位置,调整焊条角度。 %3Chowto_content%3E[{"type":"paragraph","attrs":{"is_abstract":true},"children":[{"type":"text","text":"焊工操作证是焊工作业必须持有的证件,具有极强的法律效应。焊工操作证也称为焊工上岗证,是由应急管理厅(原安监局)颁发的,像身份证一样大小,是IC卡形式的。","id":""}],"text":"","id":"doxcn22rp3QIwxsZX1FnWLTZ9wf"},{"type":"heading","attrs":{"level":1},"children":[{"type":"text","text":"考试基本介绍","id":""}],"text":"","id":"doxcnwk6xyAA8iAJVYdrJ8LtTUc"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"考试介绍","id":""}],"text":"","id":"doxcnIhqmxNFsB3D0Z5woNBHICz"},{"type":"paragraph","children":[{"type":"text","text":"焊工证属于特种作业操作证,又称熔化焊接与热切割作业操作证。证书全国通用,是由安监局进行颁发的正规证书。证书每三年一审,六年一换。证书类型(IC卡片)类似身份证。焊工操作证不分等级,一般只要是从事金属焊接切割作业(电焊、气焊、弧焊、电焊气割)等工作,都是领取同一种焊工操作证,不需要细化,证书带磁卡,全国通用。","id":""}],"text":"","id":"doxcnHB3cel6vhGxSNquBnfTBIb"},{"type":"image","attrs":{"height":367,"note":[{"type":"text","text":"考试介绍","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/815c806d7cc944ae9d34bffa09027eb6","width":292},"text":"","id":"doxcn8tcjqLUpJwKuvuLt7F4fXf"},{"type":"paragraph","children":[{"type":"text","text":" IC卡版证书样本","id":""}],"text":"","id":"doxcnUrG5hgzQmqaqRLK0uaJheh"},{"type":"paragraph","children":[{"type":"text","text":"国家文件明文规定企业聘用人员必须持此证,焊工等级资格证:俗称焊工等级证,是由人力资源与社会保障局简称为人社局,也就是以前我们常说的劳动局颁发的。 焊工职业共设五个等级,分别为:","id":""}],"text":"","id":"doxcnt9EZQjQ3peSkUz13S3zwuh"},{"type":"paragraph","children":[{"type":"text","text":"初级(国家职业资格五级)中级(国家职业资格四级)高级(国家职业资格三级)技师(国家职业资格二级)高级技师(国家职业资格一级)。这个证是按照焊接工龄,技术水平的因素综合鉴定的。","id":""}],"text":"","id":"doxcnTbXHkQjFIEIRrZ8xoEQlze"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"报考条件","id":""}],"text":"","id":"doxcnyeFIFyp49nVAxxhqjxaWrb"},{"type":"paragraph","children":[{"type":"text","text":"(一) 年满18周岁且符合相关工种规定的年龄要求;","id":""}],"text":"","id":"doxcnD6GOuuPQ7bx8TzwKX1Q8od"},{"type":"paragraph","children":[{"type":"text","text":"(二) 经医院体检合格且无妨碍从事相应特种作业的疾病和生理缺陷;","id":""}],"text":"","id":"doxcnuvAE4ZAyAWbIOLEvmDf7fg"},{"type":"paragraph","children":[{"type":"text","text":"(三) 初中及以上学历;","id":""}],"text":"","id":"doxcnzt4XtShprqzM3Rvco1fiHh"},{"type":"paragraph","children":[{"type":"text","text":"(四) 符合相应特种作业需要的其他条件。","id":""}],"text":"","id":"doxcnM5FZKPQzKLTO7xoOemhL2g"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"报考时间以及考试时间","id":""}],"text":"","id":"doxcn5krbvqNCrqm8IQUTp3EmKd"},{"type":"paragraph","children":[{"type":"text","text":"不同城市考试时间不同。焊工证的报名时间是没有限定的,在任何时间都是可以报名的,报名之后需要完成培训才能参加考试。需要注意的是报名和培训需要委托给当地的定点学校,并且是当地应急管理厅指定的焊工培训机构。每个月最少两次考试,考完3天证书可查。根据报考级别不同,下证时间也会变化,一般考后3-6月下证。","id":""}],"text":"","id":"doxcnX51bL4RQFp1Hgyo5RvgwBb"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"科目介绍","id":""}],"text":"","id":"doxcnyw9qH5RCYhjGKpmc1YX43f"},{"type":"heading","attrs":{"level":3},"children":[{"type":"text","text":"焊工理论","id":""}],"text":"","id":"doxcnAGMdA5JCXLvAAHiQI0oNeb"},{"type":"paragraph","children":[{"type":"text","text":"1、焊工安全生产法律法规与安全管理","id":""}],"text":"","id":"doxcnlQ2swuKQl7jSobe6RBM4Ib"},{"type":"paragraph","children":[{"type":"text","text":"2、熔化焊与热切割基础知识","id":""}],"text":"","id":"doxcnQujfeZUpbVx2UIOYKS86Xd"},{"type":"paragraph","children":[{"type":"text","text":"3、熔化焊与热切割作业危险源辨识","id":""}],"text":"","id":"doxcnLvwxynz8W7KTvLDEkm1VUb"},{"type":"paragraph","children":[{"type":"text","text":"4、融化焊与热切割安全用电","id":""}],"text":"","id":"doxcnCDfPSIIB4ij1xpv1Ce9Trh"},{"type":"paragraph","children":[{"type":"text","text":"5、化学品的安全使用","id":""}],"text":"","id":"doxcnMO7CdVi1AjUtizJEifwWHd"},{"type":"paragraph","children":[{"type":"text","text":"6、熔化焊与热刀割的防火防爆","id":""}],"text":"","id":"doxcn9g5SjKP612q3tKHwb6vnQd"},{"type":"paragraph","children":[{"type":"text","text":"7、熔化焊与热切割作业劳动生产与防护","id":""}],"text":"","id":"doxcnWEWVmTlARILo1jzL9MOTQg"},{"type":"heading","attrs":{"level":3},"children":[{"type":"text","text":"焊工实操","id":""}],"text":"","id":"doxcn2LI5NTQ23kfVg4ZVwftsQf"},{"type":"heading","attrs":{"level":4},"children":[{"type":"text","text":"科目一:安全用具使用","id":""}],"text":"","id":"doxcnEIxx2I9W9Blitf1ugEt7vU"},{"type":"paragraph","children":[{"type":"text","text":"1、焊条电弧焊劳动保护用品的选用","id":""}],"text":"","id":"doxcnCaSb00xcNxn1RfYuvzx3yb"},{"type":"paragraph","children":[{"type":"text","text":"2、二氧化碳含劳动保护用品的选用","id":""}],"text":"","id":"doxcnz6VnDlNGG11DGHnbphN4Oo"},{"type":"paragraph","children":[{"type":"text","text":"3、环弧焊劳动保护用品的选用","id":""}],"text":"","id":"doxcnw2aOuslR2JPtLqte8Mgewd"},{"type":"paragraph","children":[{"type":"text","text":"4、气焊、气割劳动保护用品的选用","id":""}],"text":"","id":"doxcnG92WpIEfJRoiRwT3rnw73b"},{"type":"heading","attrs":{"level":4},"children":[{"type":"text","text":"科目二:安全操作技术","id":""}],"text":"","id":"doxcnTgLdmrvUFMPzWL35Njk35b"},{"type":"paragraph","children":[{"type":"text","text":"1、焊条电弧焊安全操作技术","id":""}],"text":"","id":"doxcn16BFZVRlRLnELT8EaZAwbh"},{"type":"paragraph","children":[{"type":"text","text":"2、二氧化碳焊安全操作技术","id":""}],"text":"","id":"doxcnWK4EIYD9JHtnVmHobiN6Lg"},{"type":"paragraph","children":[{"type":"text","text":"3、镗弧焊安全操作技术","id":""}],"text":"","id":"doxcn011gOKQR73JReLEcLh8ric"},{"type":"paragraph","children":[{"type":"text","text":"4、气焊、气割安全操作技术","id":""}],"text":"","id":"doxcnEttlfoH5pHsuKHRhR2UABb"},{"type":"heading","attrs":{"level":4},"children":[{"type":"text","text":"科目三:作业现场安全隐患排除","id":""}],"text":"","id":"doxcnBfkfiO90sTGQumg9CU2Mjb"},{"type":"paragraph","children":[{"type":"text","text":"判断作业现场存在的安全风险、职业危害","id":""}],"text":"","id":"doxcnvzuLYDAWqt9vZbSvxGdDif"},{"type":"heading","attrs":{"level":4},"children":[{"type":"text","text":"科目四:作业现场应急处理","id":""}],"text":"","id":"doxcne1DkM16WRT5PCw64kMG4ze"},{"type":"paragraph","children":[{"type":"text","text":"1、单人徒手心肺复苏操作","id":""}],"text":"","id":"doxcn55kk3lywXEiuNOyk233Fhh"},{"type":"paragraph","children":[{"type":"text","text":"2、灭火器的选择和使用","id":""}],"text":"","id":"doxcnIkY6CtUxLUlGlksRO4rLif"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"考试形式介绍","id":""}],"text":"","id":"doxcnMupZXNHBK3RiivTWFbgJQg"},{"type":"heading","attrs":{"level":3},"children":[{"type":"text","text":"理论考试","id":""}],"text":"","id":"doxcnwFVuMgbIkoncVMzred6I7e"},{"type":"paragraph","children":[{"type":"text","text":"100道题,其中60道判断题,40道单项选择题,每道题1分。满分100分80分合格,使用电脑考试,考试时间120分钟。(理论考试为电脑机考)","id":""}],"text":"","id":"doxcn9saCtmKnSFw5yMMxojX8vg"},{"type":"heading","attrs":{"level":3},"children":[{"type":"text","text":"实操考试","id":""}],"text":"","id":"doxcnNIyvUcGBlwJ5GKGf03k2ud"},{"type":"paragraph","children":[{"type":"text","text":"四个科目,其中科目一:安全用具使用(劳动保护用品的正确选择与穿戴,20分);","id":""}],"text":"","id":"doxcnHeygMEuE0eW5Ivm6v1MpNh"},{"type":"paragraph","children":[{"type":"text","text":"科目二:安全操作技术(手工电弧焊、二氧化碳焊、氩弧焊、气焊,抽考其中一个项目,气割必考,40分);","id":""}],"text":"","id":"doxcnbSs8z9swLWi5m3Tm6YGhVf"},{"type":"paragraph","children":[{"type":"text","text":"科目三:作业现场安全隐患排除(视频看图隐患排查,20分);","id":""}],"text":"","id":"doxcngtjEXZGO53yDRgtUXq25Wd"},{"type":"paragraph","children":[{"type":"text","text":"科目四:作业现场应急处理(急救与灭火器的选择与使用,20分)。","id":""}],"text":"","id":"doxcnm6mL8tclRRvpPgMnRWd2fb"},{"type":"paragraph","children":[{"type":"text","text":"满分100分80分合格,现场操作,考试时间60分钟。","id":""}],"text":"","id":"doxcnbVQ80bjVL1oTMPLlL8Av8b"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"证书领取","id":""}],"text":"","id":"doxcnHnh6StuRT9YZ6mwRqvh24g"},{"type":"paragraph","children":[{"type":"text","text":"特种作业操作证有效期为6年,满3年需要复审,满6年需要换证。请在证件复审期或换证期满前60日内回学校申请复审换证。","id":""}],"text":"","id":"doxcnkZpGmjcQXa2Wm34yBnrose"},{"type":"image","attrs":{"height":461,"note":[{"type":"text","text":"证书领取","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/5332ac5998bd471a990437b91ca6223b","width":720},"text":"","id":"doxcnFzyTJHODpNTorzMSQjbtBe"},{"type":"heading","attrs":{"level":1},"children":[{"type":"text","text":"备考方法","id":""}],"text":"","id":"doxcnXcWDCrIQpYPPBm3vQUKJTb"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"焊工证笔试","id":""}],"text":"","id":"doxcnJntQSM26HtDhEJsGjnqgmc"},{"type":"paragraph","children":[{"type":"text","text":"焊工考试作为一门职业资格考试,理论知识是是以卷面考试的形式呈现的, 试题十分专业化,这就需要我们积累足够的知识与做题量。所以经常要刷题,有句话说的好熟能生巧,考试题目都是在刷题里抽查的。平时练习的话可以用云习App,免费、方便、简单、工种多、试题多,也可以下载考证宝典,全国安排考试的,里面有国家标准题库,只要多多练习,通过率很高。","id":""}],"text":"","id":"doxcnxcE0nu3JTbqEqRAtRhWq3g"},{"type":"image","attrs":{"height":480,"note":[{"type":"text","text":"焊工证笔试","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/47915e275dbf4e239a61dc8c94554ee9","width":640},"text":"","id":"doxcnBZYYVQw3MDBS6tb0mZP66g"},{"type":"paragraph","children":[{"type":"text","text":"焊接的实际操作考试主要分为手焊工和焊机操作工的考试,可以根据情况来选定或者有些省份是抽取。抽取内容为:焊条电弧焊、二氧化碳气体保护焊、氩弧焊及气焊中的一项。主要就是日常工作中的一些内容,比如说能否焊出合格的焊缝,对于焊接的操作是否合理,能否选择正确的焊接设备和焊接材料以及焊出图纸要求的简单的一些管件等,人为因素还是比较大的,换句话说,只要焊接的差不多考官都会给通过的。","id":""}],"text":"","id":"doxcnYS9XB8KgdF3PPbjwN7zSKb"},{"type":"image","attrs":{"height":400,"note":[{"type":"text","text":"焊工证笔试","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/b648f950eccc475790e3053946ce6600","width":600},"text":"","id":"doxcnQ5vNmOkhGZ1dH0PhV46Qxg"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"焊工证实操","id":""}],"text":"","id":"doxcnLIBhmlcdjJb3z9CXnlZMFd"},{"type":"heading","attrs":{"level":3},"children":[{"type":"text","text":"焊条电弧焊","id":""}],"text":"","id":"doxcnlUJvQ3X61D8n0Z8RkaD4nQ"},{"type":"paragraph","children":[{"type":"text","text":"焊条电弧焊是利用手工操作焊条进行作业,通常能够满足平焊、立焊和仰焊等多种施工位置。由于焊条电弧焊的设备比较轻便简单、操作灵活,可以适用于任何拥有电源的地方作业。焊条电弧焊同时也是最不挑剔的焊接工艺,对于各种金属材料、厚度及结构造型没有刁钻苛刻的要求。","id":""}],"text":"","id":"doxcn1NbIqJECnBoyazgomzmwPf"},{"type":"image","attrs":{"height":553,"note":[{"type":"text","text":"焊条电弧焊","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/45d2e1f0f95049f283464ff5bfcad210","width":915},"text":"","id":"C8UmdKis0oucEuxkzsucLKrVnvg"},{"type":"heading","attrs":{"level":3},"children":[{"type":"text","text":"二氧化碳气体保护焊","id":""}],"text":"","id":"doxcn8o327noxrLek70IC8ixBvh"},{"type":"paragraph","children":[{"type":"text","text":"二氧化碳气体保护焊简称二保焊,学名又称CO焊。CO具有氧化性,且CO来源广,价格低,所以作用于保护气体非常合适。为了保证获得良好的焊接效果,在焊接过程中需要考虑设施设备、施工工艺及焊丝选择等方面。在目前的焊接领域,CO焊已经是黑色金属材料的最重要焊接方式,同时,在工艺上也能够取代大部分的焊条电弧焊及埋弧焊。","id":""}],"text":"","id":"doxcn7zjgHGwUF5irmwvpxjooYg"},{"type":"heading","attrs":{"level":3},"children":[{"type":"text","text":"氩弧焊","id":""}],"text":"","id":"doxcnAT4JKMqmFeNCYmxHeXiMxd"},{"type":"paragraph","children":[{"type":"text","text":"氩弧焊是升级版的电弧焊,利用氩气保护金属焊接材料,在作业中,高电流可以让焊接材料在被焊接材料","id":""},{"type":"text","text":"商","id":""},{"type":"text","text":"熔化形成熔池,达到冶金结合的技术。在高温热熔焊接的过程中不断输入氩气,断绝了焊接材料和空气接触,能够防止焊材的氧化,所以对于铜、合金。铝等有色金属来说,氩弧焊是最为合适的焊接工艺。","id":""}],"text":"","id":"doxcnlyayOp8N78sLHAXS79wnre"},{"type":"image","attrs":{"height":533,"note":[{"type":"text","text":"氩弧焊","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/919c36c42e314a679a85300ae8ef42b0","width":800},"text":"","id":"doxcn0ldcMa1vXa6el64lfefnel"},{"type":"heading","attrs":{"level":3},"children":[{"type":"text","text":"气焊","id":""}],"text":"","id":"doxcniCKBOznlXBpTdof6dVZL3e"},{"type":"paragraph","children":[{"type":"text","text":"气焊是通过气体产生火焰将两个材料的接头熔化部分位置,再添加填充金属,等熔池冷却凝固后,两个材料形成一个整体的焊接手法。气焊的工具设备很简单,通用性比较大,对厚度薄、体量小的焊接材料作业时不易烧穿,在无电源的情况下也能够使用,所以气焊的应用环境相当广泛,不仅运用在在管道和薄壁机械的制造和安装,而且还能运用于小体量的机件和铸件的修复。","id":""}],"text":"","id":"doxcnpinDmh0Asi0dR3MKa4OjZc"},{"type":"image","attrs":{"height":567,"note":[{"type":"text","text":"气焊","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/f704d88df9e14826878d6cbe42f039a7","width":788},"text":"","id":"Fkw8dgoi4oyYeYxELHocBPUsnUe"},{"type":"paragraph","children":[{"type":"text","text":"焊证考试的技巧口诀是焊接人机料法环,操作技艺占为先。手脑合一最重要,切忌浮躁心不专。右手僵硬是大忌,内旋外旋施时变。纵横并进三方向,牢记焊接三要点。焊前组对按规范,焊条质优且要干。引燃电弧有技巧,划擦撞击可任选等等。","id":""}],"text":"","id":"doxcnX22xLHc5fXtTtYMenUBgHf"},{"type":"image","attrs":{"height":497,"note":[{"type":"text","text":"气焊","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/dbe167f486da418693afff76397d336b","width":1066},"text":"","id":"doxcn7CrJ2222suBiw4znFZQkae"},{"type":"heading","attrs":{"level":3},"children":[{"type":"text","text":"实操考核方面,需要注意的点:","id":""}],"text":"","id":"doxcn1CESKAwsFPSOv51mX0dGcf"},{"type":"heading","attrs":{"level":4},"children":[{"type":"text","text":"1、焊接时焊条的直径应根据工件的厚度、接头的形式、焊接位置和焊接层数、焊接电流的大小来选择","id":""}],"text":"","id":"doxcnlzn5tdGqdVV8akwCzJUw5f"},{"type":"paragraph","children":[{"type":"text","text":"对于非平焊位置焊和开槽多层焊的第一层,应使用直径较小的焊条;立焊、水平焊和仰焊使用比平焊更小的电极;厚板使用更厚但不合适的电极 超过板厚。","id":""}],"text":"","id":"doxcnBiSFpJ4Zy4WrMKrMgeb4kc"},{"type":"heading","attrs":{"level":4},"children":[{"type":"text","text":"2、收弧时注意填满弧坑","id":""}],"text":"","id":"doxcn8eiJE0RBUYFgTnyL6sZxgh"},{"type":"paragraph","children":[{"type":"text","text":"常用的焊缝收弧方法有:圆弧收弧、反复断弧和收弧、收弧外弧重焊收弧等。当一个焊道完成后,如果立即断弧,会在焊接面下方形成弧坑;弧坑过深不仅影响外观,还会削弱端部的强度,容易造成应力集中或形成弧坑裂纹。","id":""}],"text":"","id":"doxcn3n3FS41xbeTZvxydI7dz6t"},{"type":"heading","attrs":{"level":4},"children":[{"type":"text","text":"3、引弧方式一般有:划痕引弧法和直接引弧法","id":""}],"text":"","id":"doxcnUWuzqkma6tBKH0ptSSXWjc"},{"type":"paragraph","children":[{"type":"text","text":"操作时用力要适中,行程或行程要干净利落。否则,如果引弧动作过快或电极抬高过高,难以建立稳定的电弧,启动后电弧可能会熄灭;如果引弧动作过慢,电极和工件会粘在一起,造成长期短路。使焊条过热发红,引起药效如果皮肤脱落,则无法建立稳定的电弧。","id":""}],"text":"","id":"doxcnKPQYoYeYoCMKGFHtyW9tSd"},{"type":"heading","attrs":{"level":4},"children":[{"type":"text","text":"4、对于大间隙,一般采用三点焊,并应注意焊道的焊接顺序","id":""}],"text":"","id":"doxcn8Ze72xpat4vMMFE4HPaOQe"},{"type":"paragraph","children":[{"type":"text","text":"除了铸铁嵌件的焊接外,金属填料不适合大多数大型焊接,因为不可避免地会出现熔深不足的缺陷,焊脚的增加会影响焊件的强度。","id":""}],"text":"","id":"doxcnfjYnj152tPLjJvGXqdeMks"},{"type":"heading","attrs":{"level":4},"children":[{"type":"text","text":"5、避免磁偏吹","id":""}],"text":"","id":"doxcn8UOyelKqKiDp8d3187Rwfd"},{"type":"paragraph","children":[{"type":"text","text":"直流电弧最大的缺点是电弧会被磁吹,导致电弧不稳定,严重时无法焊接,尤其是大电流、深坡口、角焊。避免磁偏吹的措施包括:使用交流电源进行焊接,正确选择电缆接入位置,调整焊条角度。","id":""}],"text":"","id":"doxcn26R6Q22l6wsmP0XbZDxwUe"}]%3C%2Fhowto_content%3E 5. lng槽车卸车视频讲解换车的下口可装车操作时,他是有一个型号一样的卡套,把他拧转卡住 6. lng的卸液流程视频自从液晶电视上市以来,逐渐受到了人们的喜爱,很多人家里都安装了液晶电视。和普遍的电视机相比,液晶电视比较省电、较为环保。但是对于电器来说,使用久了,出现故障也在所难免,那么该如何维修呢? 基础知识 组成结构 液晶电视机的组成原理,大体有4个主要功能模块电源板,电视主板,逻辑板,背光模块,以及屏线,遥控器,按键输入和喇叭输出。 电源板 顾名思义,电源板负责整台电视的供电。功能好比人的心脏,给人全身输送能量。如果电源板坏了,就像人的心脏停止跳动,电视机自然就不能工作了。 很多黑屏,背光不亮,指示灯不亮,遥控按键不起作用等现象都是因为电源板故障引起。 电视主板 电视主板是整个电视机控制的核心,也可以说是电视的大脑。 如果电视主板出现问题,可能导致指示灯不亮、或者指示灯颜色异常、遥控按键无响应、黑屏、花屏等现象。 逻辑板 逻辑板也称TCON板,是信号中转站。负责将主板的LVDS信号转换成屏能处理的TCON信号。 如果TCON坏了,可能导致画面黑屏,花屏,条纹干扰,屏闪,屏保等异常现象。 背光模块 背光模块的功能是给电视机显示提供背光光源。 如果电视背光不亮,很有可能是背光模块出现了问题。 LVDS信号线 屏线,又称差分信号线。如果接口松动,接触不良,很容易导致黑屏,雪花点干扰,花屏等异常现象。 注意:4K电视,因为数据量大,LVDS信号线已无法满足传输要求,一般都采用V-BY-ONE的信号线传输。 遥控接收头 遥控接收头,也称IR,负责接收遥控器的红外控制信号。如果按遥控器没有反应,可能是遥控接收头出现问题。 按键板 如果遥控器可以正常操作,但按键板不起作用,估计是按键板或者相关电路坏了。 三合一板卡 将背光模块,电源板和电视主板集合到一块板卡上,俗称三合一板卡。将背光模块,电源板和电视主板集合到一块板卡上,俗称三合一板卡。 随着产品的标准和规范化,电视模块将越来越简化。目前市面上的电视,里面的模块基本都简化成两片电路了,一块三合一主板加一片逻辑板。 工作原理 如上图,红色的箭头是供电电路,蓝色的箭头是信号电路。 电源板负责将220V交流电压转换成各个模块工作所需的直流电压; 电视主板负责处理按键信号,响应遥控器信号; 控制电源板开关,直接或间接控制背光模块; 接收各类视频信号,图像转化成LVDS信号输送给逻辑板; 声音信号输出到喇叭; 逻辑板主要功能是将电视主板输出的LVDS信号转换成液晶屏能处理的TCON信号; 背光模块负责给背光灯条供电。 维修常用工具 螺丝刀 螺丝刀是工具,分手动或电动,用于旋拧(安装)和旋松(除去)螺钉。 镊子钳 夹持导线、元件及集成电路引脚等。 万用表 ,万用表又称为复用表、多用表、三用表、繁用表等,是电力电子等部门不可缺少的测量仪表,一般以测量电压、电流和电阻为主要目的。 示波器 示波器是一种用途十分广泛的电子测量仪器。它能把肉眼看不见的电信号变换成看得见的图像,便于人们研究各种电现象的变化过程。 温度可调热风枪 热风枪主要是利用发热电阻丝的枪芯吹出的热风来对元件进行焊接与摘取元件的工具。 电烙铁 电烙铁是电子制作和电器维修的必备工具,主要用途是焊接元件及导线。 锡丝 锡丝的特质是具有一定的长度与直径的锡合金丝,在电子原器件的焊接中可与电烙铁或激光配合使用。 维修技巧 基本维修的方法 直观法 肉眼观察烧黑的地方,看有无连接线松动及元器件击穿的情况。 触摸法 用手触摸关键部件,观察供电部分发热情况(数字板),特别是对老化几小时后出现的软故障情况比较实用。 问题法 了解故障出现的具体状态(比如雷击、打火、冒烟、积水及以及人为操作等)。 测量法 使用万用表、示波器测量(有些情况可用指针式万用表交流来代替示波器测量一些普通的信号)。 代换法 有条件的情况下,可以代换电源板,数字板,高频板,背光板,屏,LVDS数据线,软件等,这种方法维修快。 排除法 缩小检修范围,准确判断故障位置(如信号源部分、信号通道部分)。 逻辑检修法 该方法要求对所修板件的信号流程、电源逻辑关系非常熟悉,可以确定维修的顺序:是先从后级向前级检修,还是单一通道向公共通道检修等等。 满足法 先大体确定故障部位后,再检修部分电路的工作条件是否满足(特殊情况下可人为制造工作条件)。 对比法 条件允许的情况下,可以对比好的板件进行检修,也可以对比同一板件上相同的电路(对称电路)来进行检修。 先软件后硬件 软件涉及的故障范围广,但是需要检修的范围小,对于一些软故障,建议先升级软件。 初步检修流程 维修口诀 液晶维修并不难,工作原理记心间; 电压来自电源板,亮度来自背光源; 信号处理机芯板,显示分配控制板; 5V供电最勤劳,一年四季歇不了; 12V供给机芯板,中放功放向它看; 24V送到背光板,无它屏幕缺光源; 机芯板子是领导,开关信号向它要; 电源模块背光板,电平高开(机)低关; PWM脉冲很重要,少了亮度提不高; LVDS线要求高,变质松动有干扰; 液晶电视不普通,程序经常闹罢工; 三天两天发神经,需要复位来摆平; 液晶屏幕很脆弱,要维修时细(心)操作 平板维修费用高,学好技术很辛劳; 赚钱固然很重要,安全二字记心牢。 常见故障分析 显示器整机无电 1、电源故障 这是一个应该说是非常简单的故障,一般的液晶显示器分机内电源和机外电源两种,机外的常见一些。不论那种电源,易损的一般是一些小元件,象保险管、整流桥、300V滤波电容、电源开关管、电源管理IC、整流输出二极管、滤波电容等。这些常用的芯片在专业液晶配件店里都能买到。 2、驱动板故障 驱动板烧保险或者是稳压芯片出现故障,有部分机器是把开关电源内置,输出两组电源,其中一组是5V,供信号处理用,另外一组是12V提供高压板点背光用,如果开关电源部分电路出现了故障会有可能导致两组电源均没输出先查12V电压正常否,跟着查5V电压正常否,因为A/D驱动板的MCU芯片的工作电压是5V,所以查找开不了机的故障时,先用万用表测量5V电压,如果没有5V电压或者5V电压变得很低,那么一种可能是电源电路输入级出现了问题,也就是说12V转换到5V的电源部分出了问题,这种故障很常见检查5端稳压块(常见型号8050SD-LM2596-AIC15-01等)。 另一种可能就是5V的负载加重了,把5V电压拉得很低,换一种说法就是说,后级的信号处理电路出了问题,有部分电路损坏,引起负载加重,把5V电压拉得很低,逐一排查后级出现问题的元件,替换掉出现故障的元件后,5V能恢复正常,故障一般就此解决,也经常遇到5V电压恢复正常后还不能正常开机的,这种情况也有多种原因,一方面是MCU的程序被冲掉可能会导致不开机。还有就是MCU本身损坏,比如说MCU的I/O口损坏,使MCU扫描不了按键,遇到这种由MCU引起的故障,找硬件的问题是没有用的,就算你换了MCU也解决不了问题,因为MCU是需要编程和写码的,在没办法找到原厂的AD驱动板替换的情况下,我们只能用通用A/D驱动板代换如151D或161B等。 显示屏黑屏,无背光,电源灯绿灯常亮 斜视液晶屏有显示图像,是因为MCU问题造成没有输出开关控制电压,可以直接提取3端稳压块的。 (AIC1084)3.3V代替,修理高压板的思路(电源保险丝--开关控制管--电源管理IC--推挽发大管--电源开关管--DA转换电路(储能电感整流管)--LC升压电路(升压变压器、升压电容)--耦合电容--灯管。 屏幕亮线,亮带或者是暗线 这种问题,一般是液晶屏的故障。 亮线故障一般是连接液晶屏本体的排线出了问题或者某行和列的驱动IC损坏 暗线一般是屏的本体有漏电,或者TAB柔性板连线开路以上两种问题基本上就是给机器判了死刑了,没有维修价值的,因为一块屏的价格太高了。(广州有专门更换码片的,收费极高,返修率也高)。 花屏或者是白屏 这种问题一般是屏的驱动电压出了问题,先换驱动板和驱屏线试验,若不行检查屏背板供电电路。 维修思路:驱动板5V转3.3V的稳压块(AIC1084)是否有供电输出--屏体驱动板保险丝(F)-3.3V--DC转换电路--负压形成IC(-7V)--行列驱动IC。 AAT1101AM150XN05屏电源管理芯片,损坏后表现为白屏开机图像暗淡等。 AAT1164M170EG01新款屏通病,主要用在明基FP71G+液晶显示器上面。用一段时间会白屏、关机在开用一段时间又出现白屏。本芯片为液晶屏高压产生及管理芯片、明基液晶显示器常坏、故障为:白屏。 偏色故障 一般可以进入工厂调整模式进行调整。 维修思路:更换屏线和转接板--重写驱动程序--驱动板坏(不常见)--屏背板的控制IC坏(不常见)--拔掉屏线观察背光颜色(背光偏色为灯管老化)--换灯管。 字符虚或拖尾 维修思路:检查VGA信号线,重点看RGB三色线的地线是否连接正常--更换屏线或转接板--重写驱动程序--换驱动板--LCD屏背板信号接口 IC坏--LCD屏背板对比度电位器调整--LCD屏导光板错位--偏光片错位。 LCD屏幕内部有污点 维修思路:擦拭或更换换保护膜--拆开屏体清洗外层偏光片和有机玻璃(用棉球纯净水处理)--风筒吹干。 LCD屏漏光或光线不均 维修思路:重新安装灯管--调整导光板。 LCD屏亮点 一个或二个大的亮点,可以尝试轻轻用指尖压亮点,可消失,说明多为此像素的开关管和电极虚连小的黑点和灰点有可能是内部导光板或偏光片有灰尘造成可清洗处理。 LCD屏亮度低 检查高压板ADJ亮度调节电路--换灯管--换高压板---调整或更换导光板。 错误提示超出频率范围 检查信号线--重写MCU驱动程序--更换EPROM--重写EPROM程序--换驱动板。 通电后不按开关按键即白屏,出现背光按键后图像可正常显示 高压板接口的开关信号和ADJ信号反接造成部分属于驱动板MCU的开关信号输出不正常,可以重写MCU程序修复--换MCU。 补充一点,对于灯管老化的屏更换时要搞清灯管的尺寸,因为尽管屏幕尺寸一样,但是灯管长度与粗细略有差异,在找不到相同尺寸灯管的时候,如果能用短灯则好,如果不能使用,稍长的的灯管用手术刀小心切除屏框,并用热缩管做好绝缘。 注意事项 电视机是有电高压的一种电器,维修时有关的安全问题一定要注意。 1、打开机壳:要注意不能用蛮力打开机壳,如果太紧打不开,一定是还有螺钉或卡扣没有松开,要再仔细找找;拉开机壳时有的电视机电路板与机壳之间会有电线相连,要注意不要拉坏,比较好先折下机壳上固定的电路板;拉开机壳时要拿稳机壳,不要脱手掉下,否则容易砸到显像管管径,一旦砸断可就麻烦了。 2、要注意电视机的“热地”:有的电视机的电路板的地是“热地”,就是与市电没有隔离,如果恰巧电视机的电源插头又将未隔离的电视机的“地”端插到市电的“火”线上,那么维修时如果你不小心碰到电视机的某个接“地”的部分,就有触电的危险。一方面触电本身很危险,另一方面人在触电时身体会发生不由自主的痉挛,一旦把电视机拉到地上,就又出大麻烦了。解决这个问题比较好是用隔离变压器,如果没有,比较好在电视机通电时能调整好插头方向,使电视机的“地”接到市电的“零”线上,这样可以使电视机比较容易碰到的地方不“电”人,但是电视机里还是有与“火”线相连的强电的,仍然要小心。 3、要注意电视机内的高压:在更换行输出变压器的时候,一定要用万用表笔或其它导线将显像管高压帽下的高压泄放干净,否则在摘下高压连线时会受到高压电击,同样比较危险。 如何保养 1、保持干燥 放置的中央,环境要保持干燥并远离化学药品。假如放置环境湿度很大,电器内部就会结露,容易形成漏电、短路等。平常使用的发胶、灭蚊剂等都是高挥发性化学品,也会对液晶显现屏形成损伤。 2、亮度调低 日常使用,尽量防止长时间显现同一张画面。长时间工作容易惹起内部老化或烧坏,特别糟糕的是长时间内显现同一画面,可能会招致某些像素过热,形成内部产生坏点。而这种损坏不能修复。因而不用时应该关闭显现屏或选择屏幕保护程序,或者把显现屏亮度调低点。 3、不能频繁清洗 液晶显现屏不能频繁清洗。正确的清洁办法是拿一块沾有少许玻璃清洁剂的屏幕擦布,轻力把污迹擦去。注意不要让清洁剂流到屏幕、屏框接口中,以免出现短路。也不要用硬质毛巾擦洗,以免刮花屏幕。还要定时定量擦洗。 4、制止坏习气 杜绝使用坏习气。不要用手对屏幕指指点点。此外变压器电压很高,不要在带电的状况下翻开屏的后盖。 %3Chowto_content%3E[{"type":"paragraph","attrs":{"is_abstract":true},"children":[{"type":"text","text":"自从液晶电视上市以来,逐渐受到了人们的喜爱,很多人家里都安装了液晶电视。和普遍的电视机相比,液晶电视比较省电、较为环保。但是对于电器来说,使用久了,出现故障也在所难免,那么该如何维修呢?","id":""}],"text":"","id":"WW8Ide2aGoiCgsxk5encV6gvnkh"},{"type":"heading","attrs":{"level":1},"children":[{"type":"text","text":"基础知识","id":""}],"text":"","id":"Zg4sdAmW0oa0Gsx50oLcYGQdnbR"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"组成结构","id":""}],"text":"","id":"Q2qyduGcyoGOuAxkbcycCbuBnlg"},{"type":"paragraph","children":[{"type":"text","text":"液晶电视机的组成原理,大体有4个主要功能模块电源板,电视主板,逻辑板,背光模块,以及屏线,遥控器,按键输入和喇叭输出。","id":""}],"text":"","id":"YqSOdSGksoKCkkxgjdpc8VC0nEd"},{"type":"image","attrs":{"height":547,"note":[{"type":"text","text":"组成结构","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/d49597eb3f2f458fb1aacdb8bcdbef9c","width":600},"text":"","id":"KIuGduc4Yo64sGxgDHGcyS0Hnog"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"电源板","id":""}],"text":"","id":"NCcadCGASoIKKaxI1gYcygzZnoc"},{"type":"image","attrs":{"height":382,"note":[{"type":"text","text":"电源板","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/33c208a51667444093165fd7f535bdad","width":640},"text":"","id":"N8OodMuAWo6Y0kxgTEac2Ntdnic"},{"type":"paragraph","children":[{"type":"text","text":"顾名思义,电源板负责整台电视的供电。功能好比人的心脏,给人全身输送能量。如果电源板坏了,就像人的心脏停止跳动,电视机自然就不能工作了。","id":""}],"text":"","id":"E2y2dAoKqo22aoxkhhmcxKcinxb"},{"type":"paragraph","children":[{"type":"text","text":"很多黑屏,背光不亮,指示灯不亮,遥控按键不起作用等现象都是因为电源板故障引起。","id":""}],"text":"","id":"K6S2dK66Uos0mCx6PqTc7rRPnIe"},{"type":"heading","attrs":{"level":3},"children":[{"type":"text","text":"电视主板","id":""}],"text":"","id":"Om6gd4siSo44U6xyplZcfDDQnzX"},{"type":"paragraph","children":[{"type":"text","text":"电视主板是整个电视机控制的核心,也可以说是电视的大脑。","id":""}],"text":"","id":"HQWQd2WKgoEWIExa0EecUNIln8f"},{"type":"paragraph","children":[{"type":"text","text":"如果电视主板出现问题,可能导致指示灯不亮、或者指示灯颜色异常、遥控按键无响应、黑屏、花屏等现象。","id":""}],"text":"","id":"OyS4dCMsKoCkwSx8w6qcWrSFnCc"},{"type":"heading","attrs":{"level":3},"children":[{"type":"text","text":"逻辑板","id":""}],"text":"","id":"BAA0dYS4ko8GaExOAlwcSMQzn3f"},{"type":"image","attrs":{"height":200,"note":[{"type":"text","text":"逻辑板","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/6a2ec3b6487a474bb0572cd6b41a6a41","width":476},"text":"","id":"ZgksdK60koWCCuxANPMcX2Ijnuf"},{"type":"paragraph","children":[{"type":"text","text":"","id":""}],"text":"","id":"GKWadUmOWoQK6cxQbUoclY8cn9f"},{"type":"paragraph","children":[{"type":"text","text":"逻辑板也称TCON板,是信号中转站。负责将主板的LVDS信号转换成屏能处理的TCON信号。","id":""}],"text":"","id":"AQKCd4EUoooEGwxwV6EcWW8EnVg"},{"type":"paragraph","children":[{"type":"text","text":"如果TCON坏了,可能导致画面黑屏,花屏,条纹干扰,屏闪,屏保等异常现象。","id":""}],"text":"","id":"Nwyud4k2moy8w0xMfDUcsxd2nYf"},{"type":"heading","attrs":{"level":3},"children":[{"type":"text","text":"背光模块","id":""}],"text":"","id":"W0iudm0eMosGogxEnR0cFf7unhh"},{"type":"image","attrs":{"height":376,"note":[{"type":"text","text":"背光模块","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/f0a58b74bfb149388085b7d3c065f517","width":640},"text":"","id":"DkCCdyq0eoGMsWxGg10cl1h3nue"},{"type":"paragraph","children":[{"type":"text","text":"背光模块的功能是给电视机显示提供背光光源。","id":""}],"text":"","id":"XgqgdA6eSoamscxGkTEcrEuhn7e"},{"type":"paragraph","children":[{"type":"text","text":"如果电视背光不亮,很有可能是背光模块出现了问题。","id":""}],"text":"","id":"FEMsdQsKaoEuyGxMx62cer6vn8d"},{"type":"heading","attrs":{"level":3},"children":[{"type":"text","text":"LVDS信号线","id":""}],"text":"","id":"KesmdsScsoMkAaxUZkacXFfanwf"},{"type":"image","attrs":{"height":174,"note":[{"type":"text","text":"LVDS信号线","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/f2f5112c462f4d7689d15cca1b1d7274","width":288},"text":"","id":"IG2edW4gAoimeMx1qfDc7n8EnbS"},{"type":"paragraph","children":[{"type":"text","text":"","id":""}],"text":"","id":"QM0odQQqaoIgYkxmu1Nc6e2hn7g"},{"type":"paragraph","children":[{"type":"text","text":"屏线,又称差分信号线。如果接口松动,接触不良,很容易导致黑屏,雪花点干扰,花屏等异常现象。","id":""}],"text":"","id":"EcUMdCeuMoMgs8x2v7Nc6yronId"},{"type":"paragraph","children":[{"type":"text","text":"注意:4K电视,因为数据量大,LVDS信号线已无法满足传输要求,一般都采用V-BY-ONE的信号线传输。","id":""}],"text":"","id":"HwyGdSIWkoKoiUx06WXcQbkUnOc"},{"type":"heading","attrs":{"level":3},"children":[{"type":"text","text":"遥控接收头","id":""}],"text":"","id":"D8OCduQagoGUkmxCK1hc1UlanHg"},{"type":"image","attrs":{"height":386,"note":[{"type":"text","text":"遥控接收头","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/81b73b4097b34fa7bd7d91fc61b8ffbe","width":640},"text":"","id":"K2iYdKsC6oggeMxOInhcnIq1nCe"},{"type":"paragraph","children":[{"type":"text","text":"遥控接收头,也称IR,负责接收遥控器的红外控制信号。如果按遥控器没有反应,可能是遥控接收头出现问题。","id":""}],"text":"","id":"EUckd0E8woqg2ixQZxYcNcumn3f"},{"type":"heading","attrs":{"level":3},"children":[{"type":"text","text":"按键板","id":""}],"text":"","id":"CeAEdImqSoAkwIxYFN6c7Mrpnfh"},{"type":"image","attrs":{"height":400,"note":[{"type":"text","text":"按键板","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/4b0ba99b7c2442769d79d4a9279d604f","width":640},"text":"","id":"YMCWdMQQ2oO2K6xcTq3cLUXTn9g"},{"type":"paragraph","children":[{"type":"text","text":"如果遥控器可以正常操作,但按键板不起作用,估计是按键板或者相关电路坏了。","id":""}],"text":"","id":"TaYyd4SY0oo8w8xIvaVcgwuincc"},{"type":"heading","attrs":{"level":3},"children":[{"type":"text","text":"三合一板卡","id":""}],"text":"","id":"YYUEdw6o2o0scqxuECxcwD3lnbg"},{"type":"image","attrs":{"height":491,"note":[{"type":"text","text":"三合一板卡","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/7535a9c507344b82928b198c99420481","width":640},"text":"","id":"VO4QdQGoWogi4UxKOLZcgMWznrg"},{"type":"paragraph","children":[{"type":"text","text":"","id":""}],"text":"","id":"LeAydA80Ioo4GYxURGrcJawOnyg"},{"type":"paragraph","children":[{"type":"text","text":"将背光模块,电源板和电视主板集合到一块板卡上,俗称三合一板卡。将背光模块,电源板和电视主板集合到一块板卡上,俗称三合一板卡。","id":""}],"text":"","id":"YQIKdaEU0ooICyxMLricXBHZn4d"},{"type":"paragraph","children":[{"type":"text","text":"随着产品的标准和规范化,电视模块将越来越简化。目前市面上的电视,里面的模块基本都简化成两片电路了,一块三合一主板加一片逻辑板。","id":""}],"text":"","id":"VOcUdisEwooGAgxI1Ktc7i3InEd"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"工作原理","id":""}],"text":"","id":"QSsGdMOgoo4acOxoH3TcxZQLnWh"},{"type":"image","attrs":{"height":326,"note":[{"type":"text","text":"工作原理","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/68aff4ee95924b829b046559d8011a66","width":560},"text":"","id":"PiiKdKEIWoSgoWxw1LIczFsxn5g"},{"type":"paragraph","children":[{"type":"text","text":"","id":""}],"text":"","id":"LySYdoqgAo2iSyxiqL8cXzGFncc"},{"type":"paragraph","children":[{"type":"text","text":"如上图,红色的箭头是供电电路,蓝色的箭头是信号电路。","id":""}],"text":"","id":"AEcCdkeOAoYcgKxkYH9cVldUnSX"},{"type":"paragraph","children":[{"type":"text","text":"电源板负责将220V交流电压转换成各个模块工作所需的直流电压;","id":""}],"text":"","id":"MIssd0cCeosqOqxu4n0c1CEtnbf"},{"type":"paragraph","children":[{"type":"text","text":"电视主板负责处理按键信号,响应遥控器信号;","id":""}],"text":"","id":"Cuy0duUmmoQ4C4xh7VecJdQpnIF"},{"type":"paragraph","children":[{"type":"text","text":"控制电源板开关,直接或间接控制背光模块;","id":""}],"text":"","id":"Buysd8umuok2uWxQF5Zc6wbqnUe"},{"type":"paragraph","children":[{"type":"text","text":"接收各类视频信号,图像转化成LVDS信号输送给逻辑板;","id":""}],"text":"","id":"GS6Od4wKGoweqOxCUwQc7HRqnPe"},{"type":"paragraph","children":[{"type":"text","text":"声音信号输出到喇叭;","id":""}],"text":"","id":"GO08diuImociUExEdiFc5RHRnag"},{"type":"paragraph","children":[{"type":"text","text":"逻辑板主要功能是将电视主板输出的LVDS信号转换成液晶屏能处理的TCON信号;","id":""}],"text":"","id":"W20SdySYkoCGy4xQ7FCcNZKrn7c"},{"type":"paragraph","children":[{"type":"text","text":"背光模块负责给背光灯条供电。","id":""}],"text":"","id":"HIEudaucuooyMoxCMydcBzEAnQn"},{"type":"heading","attrs":{"level":1},"children":[{"type":"text","text":"维修常用工具","id":""}],"text":"","id":"PqYUdMemsoMW2YxWC6UcVbsxn7f"},{"type":"paragraph","children":[{"type":"text","text":"螺丝刀","id":""}],"text":"","id":"JIqSdkcOuoA4OwxQ1UAc84Vuntf"},{"type":"paragraph","children":[{"type":"text","text":"螺丝刀是工具,分手动或电动,用于旋拧(安装)和旋松(除去)螺钉。","id":""}],"text":"","id":"Aokydu6Meo0C0YxcRXPcthghnrd"},{"type":"image","attrs":{"height":683,"note":[{"type":"text","text":"维修常用工具","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/4b51b4fe86544c75ba4ea5bc9e54bf7d","width":1024},"text":"","id":"YiiEdMaw8oaIWyx8TbtcYPpLnGd"},{"type":"paragraph","children":[{"type":"text","text":"镊子钳","id":""}],"text":"","id":"WUIQdQUKWoiso4xwRErcTPeRnPe"},{"type":"paragraph","children":[{"type":"text","text":"夹持导线、元件及集成电路引脚等。","id":""}],"text":"","id":"ZokAduqK4o0Miixgl6vcbAVgn1f"},{"type":"image","attrs":{"height":681,"note":[{"type":"text","text":"维修常用工具","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/16b3f92f4846467b820c96c3fe71c112","width":1022},"text":"","id":"VkO0d40cyowY22xO8AecwLVKnee"},{"type":"paragraph","children":[{"type":"text","text":"万用表","id":""}],"text":"","id":"S0AQdUyocoQU2oxIVjQcZFzKnge"},{"type":"paragraph","children":[{"type":"text","text":",万用表又称为复用表、多用表、三用表、繁用表等,是电力电子等部门不可缺少的测量仪表,一般以测量电压、电流和电阻为主要目的。","id":""}],"text":"","id":"JgaCdWCQ4oI82ExOKAtcS8SFn6b"},{"type":"image","attrs":{"height":683,"note":[{"type":"text","text":"维修常用工具","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/8878cbc13def408e92616a5d5c628006","width":1024},"text":"","id":"Xs4qdYIIIowUO8xycjHcP1Henbd"},{"type":"paragraph","children":[{"type":"text","text":"示波器","id":""}],"text":"","id":"QYM2dQySeomqkGxQh56cEy5Gn9e"},{"type":"paragraph","children":[{"type":"text","text":"示波器是一种用途十分广泛的电子测量仪器。它能把肉眼看不见的电信号变换成看得见的图像,便于人们研究各种电现象的变化过程。","id":""}],"text":"","id":"GqImdCkCqomwYKxSQzxczW75nTb"},{"type":"image","attrs":{"height":683,"note":[{"type":"text","text":"维修常用工具","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/3977407aa4cb4be4b12c7ebf713e417d","width":1024},"text":"","id":"PswqdGKCyoYOosxCy92cwPjtnqg"},{"type":"paragraph","children":[{"type":"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被冲掉可能会导致不开机。还有就是MCU本身损坏,比如说MCU的I/O口损坏,使MCU扫描不了按键,遇到这种由MCU引起的故障,找硬件的问题是没有用的,就算你换了MCU也解决不了问题,因为MCU是需要编程和写码的,在没办法找到原厂的AD驱动板替换的情况下,我们只能用通用A/D驱动板代换如151D或161B等。","id":""}],"text":"","id":"WEKKdMm82oO0AOxmijgcGJ82nCg"},{"type":"image","attrs":{"height":718,"note":[{"type":"text","text":"显示器整机无电","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/6877eef394f0460391549cc7950ff2b9","width":1077},"text":"","id":"TemOdY8o8ooCscxC4v0cctYNnJe"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"显示屏黑屏,无背光,电源灯绿灯常亮","id":""}],"text":"","id":"ScwmdYC2soiC0Uxy0AScaYgon7c"},{"type":"paragraph","children":[{"type":"text","text":"斜视液晶屏有显示图像,是因为MCU问题造成没有输出开关控制电压,可以直接提取3端稳压块的。","id":""}],"text":"","id":"DcCAd0sWyoUm0WxzWWcclrOVnIg"},{"type":"paragraph","children":[{"type":"text","text":"(AIC1084)3.3V代替,修理高压板的思路(电源保险丝--开关控制管--电源管理IC--推挽发大管--电源开关管--DA转换电路(储能电感整流管)--LC升压电路(升压变压器、升压电容)--耦合电容--灯管。","id":""}],"text":"","id":"GUWGd8kEoo68ewx80Iqc5gxsntc"},{"type":"image","attrs":{"height":683,"note":[{"type":"text","text":"显示屏黑屏,无背光,电源灯绿灯常亮","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/28d1d08e0d744012a98d93b2b825562d","width":1024},"text":"","id":"MsYyd8kKIoYUAsxWIPDcYNDFnKb"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"屏幕亮线,亮带或者是暗线","id":""}],"text":"","id":"EOYgdaWOwoggwoxohgqc5uwvn5b"},{"type":"paragraph","children":[{"type":"text","text":"这种问题,一般是液晶屏的故障。","id":""}],"text":"","id":"J04udMScEogEgixag7UcHcR4nyh"},{"type":"paragraph","children":[{"type":"text","text":"亮线故障一般是连接液晶屏本体的排线出了问题或者某行和列的驱动IC损坏","id":""}],"text":"","id":"AcEAdaQkIoUY4OxY585cDxs6n4d"},{"type":"paragraph","children":[{"type":"text","text":"暗线一般是屏的本体有漏电,或者TAB柔性板连线开路以上两种问题基本上就是给机器判了死刑了,没有维修价值的,因为一块屏的价格太高了。(广州有专门更换码片的,收费极高,返修率也高)。","id":""}],"text":"","id":"HWy8dsS2IoyCmqx2xcmc66POnFg"},{"type":"image","attrs":{"height":2000,"note":[{"type":"text","text":"屏幕亮线,亮带或者是暗线","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/f8d9eb1e799a4641b7f7ba71179f73c8","width":3000},"text":"","id":"KY0Ad8EKooqioaxkZVwcJ31Unxf"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"花屏或者是白屏","id":""}],"text":"","id":"OA26d4yEeomOIAxOyyFc1I1anxg"},{"type":"paragraph","children":[{"type":"text","text":"这种问题一般是屏的驱动电压出了问题,先换驱动板和驱屏线试验,若不行检查屏背板供电电路。","id":""}],"text":"","id":"JQiIdcoY0oyyKExqonxcIxPVnie"},{"type":"paragraph","children":[{"type":"text","text":"维修思路:驱动板5V转3.3V的稳压块(AIC1084)是否有供电输出--屏体驱动板保险丝(F)-3.3V--DC转换电路--负压形成IC(-7V)--行列驱动IC。","id":""}],"text":"","id":"BwSgdaAkgoEwGuxQt1GcFIwRnde"},{"type":"paragraph","children":[{"type":"text","text":"AAT1101AM150XN05屏电源管理芯片,损坏后表现为白屏开机图像暗淡等。","id":""}],"text":"","id":"W8YwdySA4ogUMCxWAF3chxuOnBd"},{"type":"paragraph","children":[{"type":"text","text":"AAT1164M170EG01新款屏通病,主要用在明基FP71G+液晶显示器上面。用一段时间会白屏、关机在开用一段时间又出现白屏。本芯片为液晶屏高压产生及管理芯片、明基液晶显示器常坏、故障为:白屏。","id":""}],"text":"","id":"F6UcdsIaYoigw4xhXQYcSTbtnA4"},{"type":"image","attrs":{"height":720,"note":[{"type":"text","text":"花屏或者是白屏","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/0382d695e62249e48ce88ddd45e7eab2","width":1080},"text":"","id":"PECGdywYoouQEqxcjYVcjWO4nsg"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"偏色故障","id":""}],"text":"","id":"WUakdWow4oC0AYx8TxNcdEFKn2c"},{"type":"paragraph","children":[{"type":"text","text":"一般可以进入工厂调整模式进行调整。","id":""}],"text":"","id":"KAwwd8GmcoMgQoxJOl6cUuWingX"},{"type":"paragraph","children":[{"type":"text","text":"维修思路:更换屏线和转接板--重写驱动程序--驱动板坏(不常见)--屏背板的控制IC坏(不常见)--拔掉屏线观察背光颜色(","id":""},{"type":"text","text":"背光偏色","id":""},{"type":"text","text":"为灯管老化)--换灯管。","id":""}],"text":"","id":"OE2EdwMqAo22G0x2hsKcJpSYnYf"},{"type":"image","attrs":{"height":595,"note":[{"type":"text","text":"偏色故障","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/682812f3a52745ab9015c2bdb8a8ffca","width":892},"text":"","id":"R2aAd6qASoCwSqx2DfncS7VlnFb"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"字符虚或拖尾","id":""}],"text":"","id":"QS0Ydw8IkomMO0xQDMicNxRVnid"},{"type":"paragraph","children":[{"type":"text","text":"维修思路:检查VGA信号线,重点看RGB三色线的地线是否连接正常--更换屏线或转接板--重写驱动程序--换驱动板--LCD屏背板信号接口 IC坏--LCD屏背板对比度电位器调整--LCD屏导光板错位--偏光片错位。","id":""}],"text":"","id":"D0KUdse84ouMuQxGGovcCqUWnHf"},{"type":"image","attrs":{"height":683,"note":[{"type":"text","text":"字符虚或拖尾","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/49e51c98340e47e8b7bfb8076eb3684a","width":1024},"text":"","id":"Dyu2dmkEsoSiimxyOIScRdQ8nHh"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"LCD屏幕内部有污点","id":""}],"text":"","id":"WIyKdkuCuoI2MqxSkyZcRKEcnMg"},{"type":"paragraph","children":[{"type":"text","text":"维修思路:擦拭或更换换保护膜--拆开屏体清洗外层偏光片和有机玻璃(用棉球纯净水处理)--风筒吹干。","id":""}],"text":"","id":"Ygi2dkiY4oO6sExAXsycPzo6nSc"},{"type":"image","attrs":{"height":746,"note":[{"type":"text","text":"LCD屏幕内部有污点","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/3411022d6b21474aa77b1f139bcb0fcf","width":1119},"text":"","id":"EAUGdQi4yoaaY4xEFqIcBxQrnKd"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"LCD屏漏光或光线不均","id":""}],"text":"","id":"O4KWdaCcio8gqGxuGtWcl6ktnVc"},{"type":"paragraph","children":[{"type":"text","text":"维修思路:重新安装灯管--调整导光板。","id":""}],"text":"","id":"EgYMdOAgOosEU8xu8BJclmLjnqg"},{"type":"image","attrs":{"height":575,"note":[{"type":"text","text":"LCD屏漏光或光线不均","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/4f1fae90dd7f4885875a98b12d344c37","width":862},"text":"","id":"KaA2dmCEQocMuwxaEhlcgUhwnKd"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"LCD屏亮点","id":""}],"text":"","id":"RQE0dwIycoAK2ax2hmVc4DIWn2c"},{"type":"paragraph","children":[{"type":"text","text":"一个或二个大的亮点,可以尝试轻轻用指尖压亮点,可消失,说明多为此像素的开关管和电极虚连小的黑点和灰点有可能是内部导光板或偏光片有灰尘造成可清洗处理。","id":""}],"text":"","id":"BCQUdoykSoGQcAxh5gQcr7XenxI"},{"type":"image","attrs":{"height":720,"note":[{"type":"text","text":"LCD屏亮点","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/39e02217bd5d47d88ba8642545866e1b","width":1080},"text":"","id":"CEgKd8sgWosqEmxG8gBcswkynme"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"LCD屏亮度低","id":""}],"text":"","id":"GOQmdYWuioG6KExmKzJcaD6anVh"},{"type":"paragraph","children":[{"type":"text","text":"检查高压板ADJ亮度调节电路--换灯管--换高压板---调整或更换导光板。","id":""}],"text":"","id":"PIgCdkW6eoKeEAxA1K6cYRjknzh"},{"type":"image","attrs":{"height":720,"note":[{"type":"text","text":"LCD屏亮度低","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/d2f309cae5554291ad52f0a37e78fa36","width":1080},"text":"","id":"PMYMdWGmqoKiQMxUzJ5cZG7bnBf"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"错误提示超出频率范围","id":""}],"text":"","id":"UKkGdaY0UoYoeKx0AVLcATRRnTb"},{"type":"paragraph","children":[{"type":"text","text":"检查信号线--重写MCU驱动程序--更换EPROM--重写EPROM程序--换驱动板。","id":""}],"text":"","id":"MAEMd8Mywom02Ox6f52cPjNondb"},{"type":"image","attrs":{"height":683,"note":[{"type":"text","text":"错误提示超出频率范围","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/ddcfcfe2eef44b059d28fdf4aff6f628","width":1024},"text":"","id":"QoYidAMsMo2gk4xye2Bchj7nn0f"},{"type":"heading","attrs":{"level":2},"children":[{"type":"text","text":"通电后不按开关按键即白屏,出现背光按键后图像可正常显示","id":""}],"text":"","id":"OqYsdU2e6oCMuuxGCkRcnqnpnne"},{"type":"paragraph","children":[{"type":"text","text":"高压板接口的开关信号和ADJ信号反接造成部分属于驱动板MCU的开关信号输出不正常,可以重写MCU程序修复--换MCU。","id":""}],"text":"","id":"UOw0dACO4oKkYIxeQAFcx3sfnVf"},{"type":"paragraph","children":[{"type":"text","text":"补充一点,对于灯管老化的屏更换时要搞清灯管的尺寸,因为尽管屏幕尺寸一样,但是灯管长度与粗细略有差异,在找不到相同尺寸灯管的时候,如果能用短灯则好,如果不能使用,稍长的的灯管用手术刀小心切除屏框,并用热缩管做好绝缘。","id":""}],"text":"","id":"UyU8dEUCaoUWygxc98xcWNPknee"},{"type":"image","attrs":{"height":483,"note":[{"type":"text","text":"通电后不按开关按键即白屏,出现背光按键后图像可正常显示","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/e69eef55771b48e7bbf6ebcdc5b0165c","width":725},"text":"","id":"FkEQdQikyouEcMx2xS3chyPon8d"},{"type":"heading","attrs":{"level":1},"children":[{"type":"text","text":"注意事项","id":""}],"text":"","id":"GAsmd4agGouIk2x43LCc4WoTnRg"},{"type":"paragraph","children":[{"type":"text","text":"电视机是有电高压的一种电器,维修时有关的安全问题一定要注意。","id":""}],"text":"","id":"YCaIdiMsSogi28xUdokcdns6nng"},{"type":"paragraph","children":[{"type":"text","text":"1、打开机壳:要注意不能用蛮力打开机壳,如果太紧打不开,一定是还有螺钉或卡扣没有松开,要再仔细找找;拉开机壳时有的电视机电路板与机壳之间会有电线相连,要注意不要拉坏,比较好先折下机壳上固定的电路板;拉开机壳时要拿稳机壳,不要脱手掉下,否则容易砸到显像管管径,一旦砸断可就麻烦了。","id":""}],"text":"","id":"RG2KdeSkco0eAKxIN1TcdXBFneg"},{"type":"image","attrs":{"height":888,"note":[{"type":"text","text":"注意事项","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/3541dbd8ad7a44cab04154722ed2ea1b","width":1332},"text":"","id":"HcUGdoY4GoEOYxxSOaVcjAjbnio"},{"type":"paragraph","children":[{"type":"text","text":"2、要注意电视机的“热地”:有的电视机的电路板的地是“热地”,就是与市电没有隔离,如果恰巧电视机的电源插头又将未隔离的电视机的“地”端插到市电的“火”线上,那么维修时如果你不小心碰到电视机的某个接“地”的部分,就有触电的危险。一方面触电本身很危险,另一方面人在触电时身体会发生不由自主的痉挛,一旦把电视机拉到地上,就又出大麻烦了。解决这个问题比较好是用隔离变压器,如果没有,比较好在电视机通电时能调整好插头方向,使电视机的“地”接到市电的“零”线上,这样可以使电视机比较容易碰到的地方不“电”人,但是电视机里还是有与“火”线相连的强电的,仍然要小心。","id":""}],"text":"","id":"YEMOdOAAwomg86xkPm3cBlyqnEe"},{"type":"image","attrs":{"height":682,"note":[{"type":"text","text":"注意事项","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/e970d754d0ab4531b80dbfe870179d92","width":1024},"text":"","id":"SeQOdeAgUoYeucxXA1NcWhdHniE"},{"type":"paragraph","children":[{"type":"text","text":"3、要注意电视机内的高压:在更换行输出变压器的时候,一定要用万用表笔或其它导线将显像管高压帽下的高压泄放干净,否则在摘下高压连线时会受到高压电击,同样比较危险。","id":""}],"text":"","id":"TE2WdG8MgoUkOUxUDBNcZVgnnLV"},{"type":"image","attrs":{"height":683,"note":[{"type":"text","text":"注意事项","id":""}],"url":"https://p3.douyinpic.com/large/tos-cn-i-qvj2lq49k0/3d725834cf604f28a031e3d43eccc47f","width":1024},"text":"","id":"KeMGdIuYioCEyGxWMP9c3GeTnqh"},{"type":"heading","attrs":{"level":1},"children":[{"type":"text","text":"如何保养","id":""}],"text":"","id":"Z6QEdMcCuoamSqxUh4rcvQvEnSe"},{"type":"paragraph","children":[{"type":"text","text":"1、保持干燥","id":""}],"text":"","id":"Uq6qdkaMyoi0AgxobSVcuh03nhc"},{"type":"paragraph","children":[{"type":"text","text":"放置的中央,环境要保持干燥并远离化学药品。假如放置环境湿度很大,电器内部就会结露,容易形成漏电、短路等。平常使用的发胶、灭蚊剂等都是高挥发性化学品,也会对液晶显现屏形成损伤。","id":""}],"text":"","id":"SQkMdwWcSoSIqmxCen9cYGrQnTg"},{"type":"paragraph","children":[{"type":"text","text":"2、亮度调低","id":""}],"text":"","id":"GmA2dmAcQoIgS6xcTwycWgUXn8g"},{"type":"paragraph","children":[{"type":"text","text":"日常使用,尽量防止长时间显现同一张画面。长时间工作容易惹起内部老化或烧坏,特别糟糕的是长时间内显现同一画面,可能会招致某些像素过热,形成内部产生坏点。而这种损坏不能修复。因而不用时应该关闭显现屏或选择屏幕保护程序,或者把显现屏亮度调低点。","id":""}],"text":"","id":"SeyYdg6moo2qSwxAdYKchuc0nRb"},{"type":"paragraph","children":[{"type":"text","text":"3、不能频繁清洗","id":""}],"text":"","id":"N848dWgAmomgIOxk7BLcs9wcnsd"},{"type":"paragraph","children":[{"type":"text","text":"液晶显现屏不能频繁清洗。正确的清洁办法是拿一块沾有少许玻璃清洁剂的屏幕擦布,轻力把污迹擦去。注意不要让清洁剂流到屏幕、屏框接口中,以免出现短路。也不要用硬质毛巾擦洗,以免刮花屏幕。还要定时定量擦洗。","id":""}],"text":"","id":"HcMadkiiooWOkcxKaNackUibnKe"},{"type":"paragraph","children":[{"type":"text","text":"4、制止坏习气","id":""}],"text":"","id":"UquIdAgkYoM22axczmCckeQ6nzg"},{"type":"paragraph","children":[{"type":"text","text":"杜绝使用坏习气。不要用手对屏幕指指点点。此外变压器电压很高,不要在带电的状况下翻开屏的后盖。","id":""}],"text":"","id":"IEuGdMIkUo68QoxmAQdcM5DWnbc"},{"type":"paragraph","children":[{"type":"text","text":"","id":""}],"text":"","id":"I8mydKKoWoei8exM3hYcwT4BnJc"}]%3C%2Fhowto_content%3E 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