跳转到主内容

修复你的物品

维修的权力

商店

Vizio 42" LED TV released in September 2012.

36 个问题 查看全部

Vizio E420-A0 fails to sustain power

TV will shutdown eventually on its own - longest "session" was longer than half a minute. In some instances, the TV never generates a backlighted Vizio logo and its power LED immediately starts to fade after going full bright white.

I can't replicate the exact behavior with regards to duration of the power-on state. Sometimes the TV fails to turn on. Sometimes its power LED will light and then fade. Other times the TV will behave as expected before generating the "No Signal" box and powering down with backlighting from power-on to sudden shutdown.

Someone else tested the voltages going from the power board to the video board, and I remember him saying the 5V standby was present. We did not test voltages going from the power board to the LCD strips.

Caps have not popped and at least one is by Chemicon.

We tested the power cord and got continuity even when twisting the cord (at both ends).

Friend who tested voltages from power board to video board was thinking there's something wrong with the keyboard controller board (POWER button/swtich, change input, menu navigation, etc.). He thought a bad power board would at least give consistent behavior, even if that behavior didn't lead to a working TV.

I am also aware of a bad EEPROMS, too. I am not sure how to test such an EEPROM:

What else should I examine and diagnose further?

回答此问题 我也有这个问题

这是一个好问题吗?

得分 2

评论:

lkvee "He thought a bad power board would at least give consistent behavior, " not necessarily. This would totally depend on which part has failed. If it is a Mosfet or other power transistor it can do the shutdowns without consistency. It might help us if you can tell us where and what connector you measure and what voltages you got.

完成的

添加一条评论

1个回答

最有帮助的答案

Based on the description of your TV issue, I suggest replacing the EEPROM on the main board. When this IC reaches a high temperature its very likely to cause strange behaviors.

Also, the EEPROM is cost effective and it only requires of an average soldering skills.

Good luck with your Tv RepairJourney

Mike W

这个答案有帮助吗?

得分 1
添加一条评论

添加你的答案

lkvee 将永远感激不已
浏览统计数据:

过去的24小时: 1

过去的7天: 4

过去的30天: 30

总计 1,479