Re: Vizio VO47L inverters or Power supply
Wow, I see it now. Then I may have quite a bit of re-soldering to do since I noticed that in various places. I will certainly gain some experience on board work here. At this point with the TV being made in Dec. of 2007, is this going to be an ongoing issue with all heavy or oscillating parts?
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Re: Samsung HPS4273
My experience is limited; but I had a similar problem in a Samsung 55". It ended up being the tabs attached to the panel itself. I could temporarily fix it by manipulating the frame. I suppose that one may also troubleshoot those tabs with heat or cold, but I've never tried it.
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Re: Vizio VO47L inverters or Power supply
So you think that it is possible that this transformer is heating up, losing solid connection and sending unstable power signals to the inverters? I could see that, but wouldn't cracked solder pose a much higher threat cold than hot? Things do expand when heated. Also, ive done a fair amount of soldering, and these all looked solid to me. I admit though that ive never soldered on a board though.
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Re: Vizio VO47L inverters or Power supply
Thank you BammBamm. At this point, ill leave it on again for a while and see if the flashing starts. If not, I'll put it all back together and wait for it to become permanent instead of intermittent or wait until I get an ESR meter to do some further inspecting.
By the way, how could you tell this was not being used? The lack of any sign of previously applied solder to the joint?
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Re: Vizio VO47L inverters or Power supply
I have not been able to reproduce the flashing in the past few days to do any more voltage testing, but I do have the power supply removed and noticed that one leg of one of the transformers has no solder. Why would this be and do I need to solder this area?...
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Vizio VO47L inverters or Power supply
Hey guys,
Trying to repair this Vizio tv and after scouring the site and others as well, I'm confident that this is a common problem and points to the caps on the inverter boards, but I have what may be a basic question. Ill describe briefly the problem since its been talked about extensively, then my question.
Problem:
Intermittent back light flashing. Sometimes it starts immediately and other times it takes hours or never happens at all. I pulled it off the wall expecting to see bulging caps, but unless I'm missing something, all caps look good on all boards...
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