高压开关柜常见的故障(高压开关柜常见的故障及维修)

海潮机械 2023-01-16 13:40 编辑:admin 152阅读

1. 高压开关柜常见的故障及维修

高压进线柜看进线是否带电可以通过以下几个方面来判断

先看一下高压柜上有没有电压指示表和电压检测开关。如果电压表处于零位,转动电压检测开关分别到Uab,Ubc,和Uca,如果电压表始终处于零位,基本可以判断该配电柜上没有电。反之,在电压检测开关的三个位置上,电压表都指示400伏左右,该配电柜一定有电了。

对于交流400伏以下的低压配电盘,如果所有指示灯不亮,没有电压表,可以用氖管电笔或者电子式测电笔验电。如果氖管发亮或者电子式测电笔上显示220伏左右的电压,可以初步认为该配电盘上有电。

也可以用万用表来测量。用万用表的交流电压500伏以上档位,分别测量配电柜上的三相电源进线,如果两两之间的电压在400伏左右,该配电柜上已经送上了三相电源。

电动合闸法。如果该配电柜上的空气开关是电动合闸的,可以按一下"合闸"按钮试一试,如果听到"嗒"的一声,就是电动合闸了,说明该配电柜上有电了。

如果配电柜里的空气开关是手动合闸的,手头又没有验电笔和万用表。可以先把空气开关合上,再看一下该配电柜所供电的设备,开一下电灯或者机械设备等,如果能启动用电设备,说明该配电柜上有电。

经过以上几种方法的综合检测,就可以确定配电柜上有没有电了。

作为一个电气维修或者施工人员,手头应该时刻都有验电笔。一个原则就是:只要不能确定导线上有没有电,就一律认为该导线带电。除了自己不能盲目触摸该导线外,还要提醒周边的工作人员注意安全。必要时候悬挂安全警示牌。

进线柜一般上方有三个指示灯,来电时有两个会亮的,如果没有或者坏了,那么从新换装上就好了解来电情况了。

平时灯不亮,现在也不知道柜里是否有电?那么只有用测电笔或者万用表等测电工具测量了。

2. 高压开关柜跳闸回路故障

1.

故障现象 原因在于保护动作。高压柜上装有过流、速断、瓦斯和温度等保护。

2.

判断方法 判断故障原因可以根据继电器掉牌、遥信信息等情况进行判断。在高压柜中瓦斯、温度保护动作后都有相应的信号继电器掉牌指示。过流继电器(GL型)动作时不能区分过流和速断。在定时限保护电路中过流和速断分别由两块(JL型)电流继电器保护。 继电器动作时红色的发光二极管亮,可以明确判断动作原因。

3.

处理方法 过流继电器动作使开关跳闸,是因为线路过负荷。在送电前应当与用户协商减少负荷防止送电后再次跳闸。 速断跳闸时,应当检查母线、变压器、线路。找到短路故障点,将故障排除后方可送电。过流和速断保护动作使开关跳闸后继电器可以复位,利用这一特点可以和温度、瓦斯保护区分。变压器发生内部故障或过负荷时瓦斯和温度保护动作。

3. 高压开关柜的维护

1、配电柜为船舶配电中枢八产和设备的正常运转,任何无关人员不得扳动板上的开关。

2、发电机组启动后,应利用动力屏升速开关手动缓慢加速,直到发电机进入正常工作状态,电压与频率达到规定值,方可合闸送电。

3、配电板进入配电状态后,不得随意拔动动力屏升速开关,空气断路器的闭锁开关非紧急情况不得使用。

4、发电机并联运行要严格按照并车条件要求与规定进行操作,要注意出现逆功率(逆流)和并车失败等现象。

5、停机时应先切断发电机负荷,然后空载停车,不得带负荷直接停机。

6、交插岸电时,应先切断岸电屏各动力开关,然后检查接线与相序的正确性,确认正确后,方可实施船岸电的转换,严禁带负责操作。

7、配电柜应定期进行清洁和维护保养工作,以便使设备始终处于良好的工作状态。

7、发电机工作,轮机人员进行配电板操作时,应集中思想,谨慎操作,防止意外事故发生,否则将追究个人事故责任。

9、充放电板为船舶应急配电板,当班轮机人员应经常检查其工作状况,随时保证低压电力充足,并通过板上仪表掌握磁饱和稳压器的工作状况。

10、正常航行时,配电板上各路开关应处于接通,以保证发电机能随时启动及应照时能随时投入使用。

4. 高压开关柜常见的故障及维修方案

环网柜主要功能就是用来保护变压器的;

跳闸可能原因有:

变压器短路、超温,引起熔断器熔断,环网柜脱扣跳闸;如果是断路器柜;则断路器动作跳闸;

1.高压开关柜广泛应用于变配电系统中,对电路起着控制和保护的作用。

2.高压开关柜一旦出现故障,会造成大范围停电。

3.由于高压开关柜结构比较复杂,故障形式多种多样,故障判断难度较大。

4.检修人员只有准确地判断故障类型、故障原因,并及时进行检修,才能缩短停电时间,恢复正常供电。

5. 高压开关柜常见的故障及处理方法

故障原因:主机提供的电源与主机不匹配。如果压缩机接反是容易被烧坏的,所以需要装相序保护器。出现情况怎么判断?正常情况下显示板上直接就会显示故障码

处理办法:

首先检查电源电压线接线是否正确;

如果问题还没解决,那可能就是相序板坏了,更换相序板就行。

根据经验一般多数是线接反了,相序板硬件出现问题很少见,因为出厂的新机器一般都严格检测。

2)水流开关故障

故障原因:水流小不能使水流开关闭合,导致无法开机。

处理办法:

运行过一段时间出现故障,首先检查并清理管路过滤器(新装机器无需检查);

检查管路阀门有没有损坏或者是否打开;

检查循环泵是否符合机组流量要求;

新机器调试中水泵是否接反了;

如果都正常,那么就是水流开关本身故障,则需更换,或者直接把水流开关在主板上的两条线短接一下,如果启动,那肯定就是水流开关的问题。

3)进水传感器故障

故障原因:也叫回水传感器故障,主板检测不到进水温度或者检测的数值超过限定值。

处理办法:

线没接好,需要检查探头线路有没有损坏,检查在主板侧的接头是否牢固;

传感器故障本身有问题,更换进水温度探头;

如果主板坏了,也是会检测不到水温,这时更换主板。

4)高压开关故障

故障原因:机组高压测压力太高超过设计值,压力表超过黄线,马上到红线,就会出现高压故障。

处理办法:

考虑水流不足,检查并清理管路过滤器;

检查管路阀门有没有损坏或者是否打开,质量不好的阀门可能会打开不到位,造成水流量不足,机器热量换不出去就会出现高压报警;

检查循环泵是否符合机组流量要求,是否正常运转;

检查机器进出水口内部是否有水垢,如果有水垢的话,压缩机产生热量换不出来,也容易产生高压故障。

5)低压开关故障

故障原因:这个故障比较常见,就是低压压力太低,这时候低压开关就会断开。

处理办法:

检查机组是否缺氟,遇到这种故障首先考虑就是缺氟漏氟了,因为电子膨胀阀等元器件损坏或设备震动使其震裂,和铜管的焊接工艺不好都会导致漏氟,出现低压报警;

检查表冷器翅片是否堵塞,翅片比较脏的话,或者蒸发器表面堵塞很严重就容易产生低压故障,那么在北方就要谨防柳絮的附着;

6. 高压开关柜检修常见故障类型

一、高压水枪不能出水

高压水枪不能出水的原因和处理方法大体可分三种:

1.高压水枪上的高压喷嘴发生堵塞,这时我们只要把高压喷嘴卸下来进行清堵处理就可以了。

2.高压清洗机调压阀螺母松动,处理方法是收紧阀锁紧螺母。

3.高压水泵压力不足,检查高压泵内密封组件(O型圈、水封)是否完好,活塞是否损坏。如果活塞出现损坏这就需要检修了。

二、高压水枪漏水(出水失控)

高压水枪漏水(出水失控)的原因和处理方法大体可分三种:

1.V型密封老化导致密封不严,处理方法是更换V型密封。

2.高压水枪主阀与阀座间密闭不严,处理方法是调整或更换。

3.高压水枪控制阀与主阀间密闭不严,处理方法是调整或更换,高压水射流设备。

综上所述,是高压水枪的常见故障和处理方法,我们在使用高压清洗机进行清洗作业时如果遇到上述问题不用着急,参照处理方法解决就可以了。

7. 高压开关柜的检修

主要检修开关五防1,防止带负荷合闸。高压环网柜内的真空断路器小车在试验位置合闸后,小车断路器无法进入工作位置。2.防止带接地线合闸。高压开关柜内的接地刀在合位时,小车断路器无法进合闸。3.防止误入带电间隔。高压开关柜内的真空断路器在合闸工作时,盘柜后门用接地刀上的机械与柜门闭锁。4.防止带电挂接地线。高压配电柜内的真空断路器在工作时合闸,合接地刀无法投入。5.防止带负荷拉刀闸。10kv高压开关柜内的真空断路器在工作合闸运行时,无法退出小车断路器的工作位置。

8. 高压开关柜常见的故障及维修视频

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

9. 高压开关柜常见的故障及维修方法

汽车继电器的常见故障现象有:线圈烧断、匝间短路(绝缘老化)、触点烧蚀、热衰变以及无法调整初始动作电流等。汽车有很多不同的继电器,其作用包括:

1、保护控制开关。加继电器后,控制开关只流过较小的继电器线圈电流,因而开关就不容易损坏,使用寿命得以延长。

2、 实现自动控制。一些继电器线圈电流由汽车电路中的某个工作电压控制,当电路中的受控电压达到设定的继电器动作电压时,继电器触点改变工作状态,从而实现自动控制。汽车继电器坏了,用电器就会不工作。如果所讨论的是主继电器,那么汽车将无法启动。