Vizio M502i-B1 Power Supply Issue

[nomoresonys]

Re: Vizio M502i-B1 Power Supply Issue

Seems like it or a bad connection in the backlights, did you try jiggling the backlight cable on the bad side?

[JunkmanJimbo]

Re: Vizio M502i-B1 Power Supply Issue

I did try jiggling the cables. But now it looks like I'm back to square one. I swapped the LED driver boards just to see what would happen and then I had no picture. But I think I blew that board while testing awhile back. So I put the replacement board back in and then I had a picture. So I tried disconnecting the LED cables one at a time again, and now instead of the symptoms being on one side only, it's now on both sides.

[nomoresonys]

Re: Vizio M502i-B1 Power Supply Issue

Maybe the bad led if it is the problem just got worse, maybe very carefully tear it down and check the backlights and connections, the panels are VERY flimsy and easy to break, that's why you should test as much as you can before teardown, lots of videos on youtube of procedure, many use suction cups for lifting panel off more safely.

[JunkmanJimbo]

Re: Vizio M502i-B1 Power Supply Issue

Thanks nomoresonys. I've done the voltage test and listed those earlier in the thread. I considered ordering another LED driver board just to see if it makes a difference. I've done a lot of backlight repairs so I might go ahead tear it down but I haven't decided for sure yet. I am so close to giving up on it but I have so much time and money in it now I would like to try to fix it.

[nomoresonys]

Re: Vizio M502i-B1 Power Supply Issue

I don't blame you, 50 is a pretty nice size, not too big and not too small, can put m in a lot of places.