Vizio M43-C1 No Backlights

[alfatv]

Re: Vizio M43-C1 No Backlights

Got a Toshiba 43l621u with broken screen.
Took good screen from M43-C1 and put it into Toshiba,
Problem solved, much less hassle than dealing with Vizio main boards.

[ShortLegs]

Just want to thank all the great contributors to this site for such excellent detail. I had a Vizio M50-C1 that my son was about to trash so I decided to try and revive it. The behavior was that the TV would turn on, then after a few minutes, reset and then pickup where it left off (on a Roku stick). It began to do this intermittently, then more or less constantly.

After vetting the power supply and thinking it was OK, I moved on to the main board. I was fascinated to read all the threads on the Ball Grid Array (BGA) process and the negative characteristics of the lead-free solder balls used in the C1 TVs. It's an old TV, and was on its way to recycling, so IMO it wasn't a candidate for the more professional reflow service. I decided to give the home oven bake a try. I settled on a 400°F @ 10 minutes method, with a gradual ramp up to the full 10-minute heat at temperature, and a long cool-down in the oven to ambient temperature. It worked! It's at least useful as a diagnostic tool, even if it won't persist long-term.

During my investigation of the PSU, I ran into the issue so many of you did, with the six points on the CN9102 connector labeled 12VDC but reading 19VDC. All I can say is that after getting the TV operational, I went back and re-read those points - they are all still at 19VDC. So I assume that the board is indeed mismarked.

I did find a link for the power board general schematic at
https://elektrotanya.com/715g7732-p0...wnload.html#dl

At any rate, I had a lot of fun during the repair, and learned a lot. Thanks to the Badcaps community!