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My LG Plasma 50PX1D popped and now shows a dark blackened image with sound. Could it be the x, y or z sus boards? If so, which one would most likely be the problem and how do I test them? Thanks

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You mean you heard a pop sound before the display went dead? If yes then you will probably be able to look for tell-tale signs of damage. Look for anything like a blown fuse, a charred area on the board, Cracked leaky or swollen capacitors(usually at the tops), expanded transformer(if the coil is damaged). Check all 3 sustain boards and also the logic control board and post back with your observations.

Sai.

Posted on Feb 11, 2010

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Very likely either the YSUS board is going bad and/or the power supply voltages are getting noisy because of failing capacitors.

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The first thing you should look into is the Z-SUS board, the one situated on the right side viewed from the rear. This board develops a high voltage during operation that might be the source of the popping sound. It is also responsible in refreshing the panel for proper picture display. The weird colors on your TV indicates a faulty Z-SUS board.
Note: Unplug the TV and wait for at least five minutes in order to allow the voltages to drain before you disconnect or reconnect any connector.

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Either X,Y, or Z-boards seem to have developed a problem, when this happens it results in a 'sound-no-picture' condition. If its under warranty take it back, if not have your local tv repair center fix it for you....

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1 Answer

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Well it takes a good Y and Z to make a good picture.

Slow turn-on sounds like power supply problem to me, although I've worked more on LCD sets than plasma, so I could be wrong.

Here's an ebay link that tells how to test your Z, and coincidentally has a Z board for sale.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=350088827899

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Hi you need the y-sus board. You May find it @ partstore.com Thanks.

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Z-Sustain PCB will cure it.

It is inside the TV, on the Right Hand Side.

www.chsinteractive.co.uk or Google for a replacement.

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i would replace both the z-sus and y-sus boards. These should be replaced by a technician as some adjustment is needed afterwards.

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Hi , I recently had the same problem which I was determined to fix . So I did a few weeks of research to find that it was the Y SUS board which burns out. I'm sure you realized that the TV gets hot. Personally I think this is why. circuit boards don't like heat and I've learned that the cooling fans are a joke. I replaced the board and got my picture back. I proved the fan theory because after the screen started to act up. I placed a cooling fan near the vent holes on top and the problem cleared right up,It also helps if you lower the brightness which helps out on the heat situation.I will soon be adding a fan with a temp. sensor. This shoud help if your screen has lines when you initially turn the cool TV on.then I have Some other costless solutions. Hope this helped these are great TV's and like our cars we maintain them not throw them away..................................Mr Wiseman

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Hi all..i had the same problem with my 42 inch LG
rz42px11. its a faulty zsus board(Z sustain part no 6871QZH033A) the pop
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