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Samsung Plasma - no picture. Mod: PS50Q97HDX PDP: S50HW-YB02

 
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laluna



Joined: 02 Jan 2009
Posts: 9
Location: Glossop UK
PostPosted: Sun Mar 06, 2011 6:44 am    Post subject: Samsung Plasma - no picture. Mod: PS50Q97HDX PDP: S50HW-YB02 Reply with quote
Hello.
I have a Samsung PS50Q97HD 50 inch plasma TV that keeps blowing new boards and I don't know why. It came to me with a faulty YSUS that had damaged the VS supply section in the PSU board. I fixed the PSU and fuse and have good VS voltage now. I replaced the YSUS main. I powerd the TV and the upper YDRIVE (Yscan buffer) board chips went pop. I put this down to it getting damaged unseen when the YSUS went faulty. I replaced the YDRIVE upper with new and then the lower board went faulty too (holes blew in the tops of the scan buffer chips). I replaced the lower board, now getting worried about how much this was costing me (260 pounds sterling so far!!). Powered the TV and the new upper board went pop again! I'm at a loss. Should I have adjusted the potentiometers on the new YSUS, it doesn't mention this in the service maual. Can a faulty ZSUS blow the YDRIVE boards? Can the PDP be faulty with an internal short and blow YDRIVE boards? Any help would be very much appreciated.
Dan.
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gary



Joined: 05 Apr 2005
Posts: 584
Location: MANCHESTER, uk
PostPosted: Tue Mar 08, 2011 9:33 am    Post subject: Reply with quote
probably a faulty pdp, have a very close look at the screen, check for any blackened pixels. had the same thing on a couple of panasonic plasmas recently,
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laluna



Joined: 02 Jan 2009
Posts: 9
Location: Glossop UK
PostPosted: Thu Mar 10, 2011 2:56 pm    Post subject: Reply with quote
gary wrote:
probably a faulty pdp, have a very close look at the screen, check for any blackened pixels. had the same thing on a couple of panasonic plasmas recently,


I have had a close look at the PDP and can't see any blackened pixels, how easy are they to spot?

I did find that one of the MOSFETS on the brand new YSUS board has gone short. I am still hoping it's a case of 'should have changed all three at once'.

I have replaced the faulty MOSFET in the YSUS and I still have a good lower yscan buffer board. Maybe I can test the TV with a lower buffer board only before I go out and buy another upper board. x fingers.

Dan.
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