Question about LG MU-42PM11 47 in. EDTV-Ready Plasma Television

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My LG MU-42PM11 popped a fuse on the zsus board. I tryed replacing just the fuse but it just blew again. Will replacing the zsus boaed fix the problem or is there anything else that could be the problem? The tv had sound but no picture or menu.

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  • mestrovich Sep 01, 2010

    Ok, I replaced the Z-sus board with a rebuilt unit bought off of e-bay. The TV worked great for about 5 days. On the sixth day, I noticed that there was some... static on the screen, like 1 white pixel for every square inch of the screen. It was like this for a few hours when the picture got real distorted/fuzzy, after about 1 min of this the same fuse that blew on the old Z-sus board blew on the rebuilt Z-sus board. So now im back at square one. The new Z-sus board has a 3 month warranty on it. Is it possible the rebuilt board is faulty or could the buffer board be bad?

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Hello again.
In case if you would replace fuse (it's one of two ceramic slow-burning fuses installed in holders next to each other) and it woudn't burn but TV still have no image - that means that both Z-Sus and Power Supply boards are bad. If fuse got blown again right away - usually indicates that Power Supply board still OK and does not need to be replaced.
Before go ahead and order Z-Sus board, visually check out narrow buffer board that attached to it. On other end of it you will see several flat ribbon cables that go into Plasma Panel. Make sure that you will not fined any cracked (exploded) microchips ot other electronic components or burn marks on it. Sometimes short in buffer board can cause Z-Sus short out as well. If everything looks fine - replacing just Z-Sus board would in 95% cases repair your TV.

Posted on Aug 19, 2010

  • russtash Sep 01, 2010

    OK. You have to check voltages that coming out of Power Supply Board and adjust them if necessary. They got names like: "Vs, Va, Vset, Vscan" etc. Each adjustable V have potentiometer on the Power Supply Board with appropriate label. There is also sticker somewhere on PDP (panel) that states correct Voltage values. You have to use multimeter to have read and adjust those using phillips screwdriver. Black probe of multimeter should be on Ground and red you can put on labeled test point or just directly into the plug with appropriate marking (every pin on every plug that comes out of Power Supply Board is marked).
    Most of the time if Va or Vs out of range - it creates that "static" looking white pixels on screen when TV is on. Those values also can change when TV is warmed up after appr. 30 minutes of use.
    Replace Z-sus once more and adjust Voltages after it fully warms up. If you will still have same problem - buffer boards or even panel itself could be bad.
    Remember - you are trying to quick fix something that takes years of practical work to learn. It's like you are trying to fly aircraft with no experience and even no instructor in cockpit. So - don't be too hard on yourself, give it another try and if it is not going to last - just save for new TV.
    And stay away from Plasma technology with your next purchase.
    Russ.

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