Vizio M50-C1 Nothing on screen, no backlights

[Skipper14]

I have acquired a non-functional Vizio M50-C1. Previous posts have revealed higher than expected voltages on the 12v pins (recorded at 19v). Mine is the same. LED on main board illuminates when plugged in as solid red. When powering up, it changes to red and blue. The power indicator comes on then fades out as normal. Nothing displayed on the screen even with the flashlight test. No backlights at any time. Remote functions, turning the TV on and off. Power will cycle about every two minutes. From my reading of others before me, it appears to be a short in the main board. Replacing the board will run about $60 plus shipping. Trying to eliminate any other possibilities before I spend the bucks. Pictures can be posted if required.

[diif]

Re: Vizio M50-C1 Nothing on screen, no backlights

Yes photos, investigate the 19v instead of 12v.

[Skipper14]

Re: Vizio M50-C1 Nothing on screen, no backlights

Image attached.

[budm]

Re: Vizio M50-C1 Nothing on screen, no backlights

See this link: https://www.badcaps.net/forum/showth...t=Vizio+M50-C1

[Skipper14]

Re: Vizio M50-C1 Nothing on screen, no backlights

I have read that post at least five times before creating an account and posting my query. I'm fairly confident it's the main board but was looking for any other possible test methods I could try to confirm. Thanks.

[nomoresonys]

Re: Vizio M50-C1 Nothing on screen, no backlights

Most likely mainboard, try with tv unplugged from power, unhook cable from powerboard to mainboard, plug tv back into outlet, see if backlights come on and stay on.

[nomoresonys]

Re: Vizio M50-C1 Nothing on screen, no backlights

Had 2 or 3 threads lately, where the 12 was 19 volts and fault was mainboard.

[diif]

Re: Vizio M50-C1 Nothing on screen, no backlights

I have read that post at least five times before creating an account and posting my query. I'm fairly confident it's the main board but was looking for any other possible test methods I could try to confirm. Thanks.

Investigate the 19v instead of 12v, follow the trace and see which component it goes to. You have a multimeter ?
Your photo does nothing to assist.

[nomoresonys]

Re: Vizio M50-C1 Nothing on screen, no backlights

https://www.badcaps.net/forum/showthread.php?t=76708

[Skipper14]

Re: Vizio M50-C1 Nothing on screen, no backlights

Guys, thanks for the participation. Decided to just get the replacement board and TV is now functional. Would like to know more about deep diving on these boards to identify the faulty part. That probably takes more electronics education than I have been exposed to. Will continue to improve and try new things. On to the next one.....Thanks.

[neilc6]

Re: Vizio M50-C1 Nothing on screen, no backlights

Looks like Mxx-C1 series suffers from BGA failures of the lead free solder balls used on the main processor that crack over time. This problem affects LG LV series, LG LS series, laptops, Xboxes and PS3's. If you took a hair dryer to the processor before plugging it in, then it should have expanded the joints enough to make contact and start up the tv to confirm the failure.