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I have a LG 60PC1D-UE.AUSLLJR After it has been off for awhile, like overnight, when it is first turned on I get a horizontal band across the screen for about two thirds of my picture from bottom to top. It stays on for about 5 min. I have replaced the y sus and upper and lower y drive and the large power supply. Still the same. I have a good picture of it that I can send. Suggestions?

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  • Patrick McAlexander Jul 20, 2010

    Is this also called the control board?

  • Patrick McAlexander Jul 21, 2010

    There is one other thing that bugs me about this tv. There looks like either trash or maybe even a burnt spot on screen. I see that there is a plastic cover over the screen and a mirrored spot in same location on cover and on screen. There are other random spots over screen. I highly doubt its dirt. Could there be burnt spots on the screen? Whats your idea?

  • Patrick McAlexander Jul 28, 2010

    Thank you. You have been very helpful.

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Hi:
It is common that when you replace the Y-sus you replace the x sus, especially when dealing with LG, LG also recommends when replacing these board to replace the Digital singnal processing board also. also make sure that before you connect power connectors to the sys boards you measure and adjust the VA and VE and VS voltages to the factory spec's voltage chart that are on the label attached to the panel. Not adjusting these voltages to the correct values could blow the boards or if to low could result in unexpected results.Not to say this is your case but, with my experience with working on LG units we always order all four major boards in the unit. I would be looking at replacing digital board or logic in this case seems you have a thermal problem on one of the boards, but since you already replace several of them and have the same results try replacing the board that is actually responsible of producing the picture on the screen , Logic board assembly. Logic and digital may be one and the same board. GOOD LUCK...

Posted on Jul 20, 2010

  • Lavell Turner
    Lavell Turner Jul 21, 2010

    Yes, but sometimes these boards are seperate, depending on the model and year manufactured.

  • Lavell Turner
    Lavell Turner Jul 21, 2010

    Hi: As to your latest question the spot on the sreen. Plasmas only use glass fronts, there could be a fungus growing between the glass and panel, one way to check is remove the panel from the unit, the front glass will be left in the unit when the panel is remove and clean the two piecies at this point, if the spot does not go away then try contacting LG about a new one either glass or panel which ever one is defective usually the glass, eventho the unit is no longer under warranty as this is a manufacture defect and no fault of the consumer, LG have a tendancy to be willing to listen if pushed hard enough,lol. As for the random spots appearing on the screen, I am thinking you are talking about speckels spots appearing randomly, if so this is due to the VE and VS ,VA voltages set to low, Make sure you measure these voltages and use the trim pots to adjust them out. On the power supply the large white plugs that attached to the Sys boards the plug termainals are labeled on the board, using a ohm meter on dc voltage setting attach ground of meter to panel and positive lead to VE,VS and VA terminals. Look for the corresponding trim pot on the power supply and using a none metalic screwdriver adjust these voltages to the same as labeled on tag attached to the panel. There may be fore voltages to set on LG's as your PS is new, so this needs to be done.

    There also may be ve and vs voltages trim pots on the sys boards also, but on these boards mark the trim pot with a black marker before you attempt to adjust so you do not turn them to far out of tolerance. There is no voltage reading on the sys boards so you will have to watch the screen at the same time while adjusting the pots on the sys board. turn CCW /CW until you just see the random spots disappear.

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