53HX71 Replaced STK392-110 about 7 months ago worked well..now convergence failed again
I replaced the STK392-110's about 7 months ago and the TV picture looked beautiful. Yesterday I saw a wavy blink, and the blue horizontal waves started. Today the red and blue have started to fail. I had the ic's professionally soldered and the soldering quality looked outstanding. He used thermal compound quite liberally so I am not sure that's the problem. I think there are two possibilities if the STK's failed again: overheating or a bad quality part. Can you suggest a good part's site, and any other possibilities before I swap them out again? Or is there an upgraded part number to replace these?
Re: 53HX71 Replaced STK392-110 about 7 months ago worked...
Thermal compound should be used SPARINGLY for maximum effect. There should be enough to create a thin film over the entire mating surface. Too much compound reduces the heat transfer from component to heat sink.
I buy parts from www.mainelectronics.com
They are reputable and I can drop by on my way to work :-)
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Very common problems,through out the DLP tv life cycles could happen again again until end of the tv life itself.The tv have a problems known as a convergence picture problems,it is dead.Tv have any colors lines like R,G,B mis alignments,have colors shadow pictures or 3D pictures look alike?Yes?Than the tv convergence board it is dead.The tv convergence board must have it components parts replaced like 2 STK convergence ICS and some or all of it resistors too.To fixed the tv convergence board to solved the tv convergence picture problems.The Shop will cost u like $300-350 for parts and labors.
Yes,the tv problems it is the same,it is the tv convergence problems again,now it just color it is shaded in shadows pictures,instead of wavies mis colors R,G,B mis alignments.Yes.The tv convergence board it is the problems,must be repair again.
The convergence is dead,Must replaced Convergence ICs and resistors.Tell the shop to repair it again.They probally didn't replaced the ICs or resistors.This problems can't come back about a week,at 6 months i can understand.
Well, my thought is that there are a ton of knock off generic convergence IC's out there that usually hold up as long as yours did. Professionals like me will only use Sanyo original STK's. The counterfeit STK's out there are everywhere. Do some research on the web to locate Sanyo originals, they are out there.
Don't feel bad about Mits. All the projection companies and all
the new TVs have markedly poorer reliability than the good old CRT
types. You should see all the class action lawsuits against even
some of the best companies!
The power supply section is not working.
Common possibilities are:
- Convergences amps have failed overloading the supply
- High-voltage section (flyback transformer) has failed
(happens sooner or later, about 8 years typical))
- CRT tube has failed overloading the supply
- Power surge has popped the power input circuit.
(Fuse, rectifier diodes, turn-on relay etc)
- One of a hundred of electrolytic capacitors has failed
short overloading the supply. They dry
out with age, are cheap to replace, but hard to find which one it is.
- Or any of many other possibilities.
In short, you need a experianced tech to troubleshoot this.