Vizio M420NV Powers on for a few seconds then resets
I have a friend who's Vizio is having issues. I have the set here and have recapped the entire power board but still having the same issues.
From a cold start (>10m) the unit will stay powered on for about 2 minutes. After that time, it reboots. Each time it reboots the time till failure decreases. After about 5 reboots it only stays on for maybe 10 seconds then continues to reboot. If you leave the unit unplugged for about 10-15 minutes it will stay on for another 2 minutes or so before doing this all over.
He had actually called Vizio and they were going to send someone out and "replace the power board" for $199. Hardly worth it since I was almost sure it was a cap issue because of the symptoms, however it wasn't.
Anybody up for helping me diagnose this sucker? Looks like a combination power/inverter board and I suspect something is heating up and then failing -- I'm just not sure where to start and I can't find a schematic for this thing. It doesn't seem like the normal eeprom issue you normally see with the Vizios.
I have my dmm ready! Thanks!
EDIT: I did not replace the 2 big 450v caps. I believe these are know as the filter caps?
From a cold start (>10m) the unit will stay powered on for about 2 minutes. After that time, it reboots. Each time it reboots the time till failure decreases. After about 5 reboots it only stays on for maybe 10 seconds then continues to reboot. If you leave the unit unplugged for about 10-15 minutes it will stay on for another 2 minutes or so before doing this all over.
He had actually called Vizio and they were going to send someone out and "replace the power board" for $199. Hardly worth it since I was almost sure it was a cap issue because of the symptoms, however it wasn't.
Anybody up for helping me diagnose this sucker? Looks like a combination power/inverter board and I suspect something is heating up and then failing -- I'm just not sure where to start and I can't find a schematic for this thing. It doesn't seem like the normal eeprom issue you normally see with the Vizios.
I have my dmm ready! Thanks!
EDIT: I did not replace the 2 big 450v caps. I believe these are know as the filter caps?
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