TCL2169开机蓝屏有雪花点，无图像无字符（已修好）

binladen · 发表于 2012-4-11 23:40:45

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本帖最后由 binladen 于 2012-4-12 17:13 编辑

TCL2169 （芯片组合：CTV222S + LA7685J）高压帽打火导致的故障现象：只能用遥控器开机（面板按键无反应），开机后屏幕是蓝屏的，无图像、无字符，只有满屏的雪花点。按遥控器或者面板按键都无任何反应（按遥控也关不了机）。开机瞬间用示波器检测存储器的6、7脚发现I2C总线电压是5V但是没有任何波形，行脉冲波形也不正常。已经换过空白的存储器和CPU “CTV222S"，LA7685J没有换过。
CTV222S的供电电压和复位都正常，为什么开机瞬间I2C总线没有波形？费解啊，请大家帮帮忙啊！在此先谢谢你们了。

该机已修好，是按键电路中的一个开关二极管击穿了。

binladen · 发表于 2012-4-12 08:31:26

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binladen · 发表于 2012-4-12 17:11:34

该机已修好，是按键电路中的一个开关二极管击穿了。

落烂神仙 · 发表于 2012-4-12 18:20:48

楼主煞费苦心自己顶个裸模出来不容易啊

11流浪 · 发表于 2013-12-3 21:03:51

学习了，楼主厉害

手撸飞机炮 · 发表于 2013-12-3 21:12:39

哈哈哈哈哈哈哈

无言浪子 · 发表于 2015-3-28 18:14:07

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大万家电 · 发表于 2016-10-28 10:34:19

学习了，谢谢分享

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[TCL] TCL2169开机蓝屏有雪花点，无图像无字符（已修好）

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