Vizio SV421XVT Not turning on

[Louis82]

Hello,

I have this Vizio Tv SV421XVT that does not turn on. Front orange light is on and does not change to white after pressing power button as vizio tv's usually do.

Power supply and backlight tested good. I used jump on PS-ON and BL-ON. My next step is the main board. I looked for bad voltage regulators but I'm not sure if they are good or bad. Here are the reading:

U4 (L213 G9117)
IN: 3.3v
OUT:1.2v
ADJ: 0v

U7 (L213 G9117)
IN: 5.1v
OUT: 3.3v
ADJ: 2.0v

U2 (L213 G9117)
IN: 5.1v
OUT: 3.3v
ADJ: 2.0v

U6 (L213 G9117)
IN: 12v
OUT: 8.1v
ADJ: 6.9v

Thank you for your help.

[Nick's Tvs]

Re: Vizio SV421XVT Not turning on

http://www.shopjimmy.com/vizio-sv421...eprom-only.htm
Symptoms EEPROM replacement MAY fix:
- TV won’t power on with remote or buttons (LED indicator remains same color)

I have gotten probably 5 vizio tv's out of 8 in the last months with bad EEPROM chips. This is not a solution, but just a suggestion. They are very cheap so in my opinion worth a try especially since these main boards are super expensive.

[Nick's Tvs]

Re: Vizio SV421XVT Not turning on

Have you gotten any new information about the tv, or have you decided to give the EEPROM a try?

[Louis82]

Re: Vizio SV421XVT Not turning on

Hi Nick.
Thank you for responding. It was on my mind to try replacing EPROM but in my experience only 1 out of 8 have worked for me. I ordered it anyway and will report back the results. Thank you again.

[Nick's Tvs]

Re: Vizio SV421XVT Not turning on

Forgot to ask but when you jumped PS-ON and BL-ON did you get backlight?
As for the EEPROM fingers crossed.

[Louis82]

Re: Vizio SV421XVT Not turning on

Yes. Backlight works after applying jumps on BL-ON. Replaced EPROM, it didn't work.

[Louis82]

Re: Vizio SV421XVT Not turning on

I tried the trouble shooting performed on the link below and i get backlight, front orange light remains same color and no display or picture at all.

https://www.badcaps.net/forum/showthread.php?t=34303

Any suggestion?