SAMSUNG plasma PS42Q91HD turn off issue

[h2setyabudi]

I got samsung plasma to be salvage here from a friend. when i powered it on, it goes on for 20 mins or so then it just shut off and clicking with 30 seconds apart until I unplugged it from power point. The remote does not work when the issue happened.

I opened up the back of the tv and looked at possible bad caps symptoms but no luck. All caps look good, no leaking, no bulge, no burnt mark, no mark at all. I suspected couples of 1000uF 35v, which measured at 1600+uF on circuit but when I pulled these out. it just measured correctly around 980uF.

Anyone can gimme any idea how to proceed with troubleshooting?

[martyparish]

Re: SAMSUNG plasma PS42Q91HD turn off issue

You'll get more help if you take some good clear photos of the whole back of the TV and closeups of the boards.

[h2setyabudi]

Re: SAMSUNG plasma PS42Q91HD turn off issue

Thanks for the advise martyparish.

Guys, please help. dunno whats the next step.
I attached the pics now, sorry a bit late.

[tw2005]

Re: SAMSUNG plasma PS42Q91HD turn off issue

Thanks for the advise martyparish.

Guys, please help. dunno whats the next step.
I attached the pics now, sorry a bit late.

I've had a 50" which would randomly shutdown after it warmed up and ended up being bad solder joints on the FETS on the long slim heatsink in the middle from memory.

[tom66]

Re: SAMSUNG plasma PS42Q91HD turn off issue

It's a very common issue and easily fixed.

[h2setyabudi]

Re: SAMSUNG plasma PS42Q91HD turn off issue

It's a very common issue and easily fixed.

Thanks Tom, but any advise to fix?

[tom66]

Re: SAMSUNG plasma PS42Q91HD turn off issue

Yes, locate the transistors along that long heatsink and re-solder all of the joints on each of the transistors.