Question about LG RU-42PZ61 42 in. HD-Ready Plasma Television

2 Answers

LG Plasma TV RU-42PZ61 vertical bars of all colors

I have a question regarding my LG Plasma TV RU-42PZ61.
The initial problem started with two vertical red bars ~2" on each side that occasionally would go away.
By poking around I found to be a possible cold solder joint on the control board (6871QCH038A); by wedging a piece of wood behind the board it would work ok for quite a while.
Until one day the image detriorated completly. (I believe that I heard a pop) I ordered a replacement for this board w/ a different part # (6871QCH060Q) . I was told that this was a new redesign that replaced the original one. (??)

The replacement board did not fix the problem entirely; now it displays verticall lines of all colors.
(When I switch to another input that has no signal, the screen reduces to a narrow vertical strip of about 6 or 8"). Is this due to possibility of the board replaced not being compatible Or another board was also damaged?
If so, which board would be based on the symptoms?
Your help is much appreciated.

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  • 7 more comments 
  • Luis Pinto Mar 30, 2008

    Hello IB4G2008,
    Thanks for your response;
    I was not aware that plasma TVs have deflection ckt.
    Unfortunatly I don't have the service manual or schematics for the TV; however I know where the power supply is located.
    Thanks for the help.

  • Luis Pinto Mar 30, 2008

    There is a considerable difference in behaviour between the two control boards; probably I can assume that was part of the problem. Would you be able to provide me with the voltage values and test points?
    Thank you.

  • Luis Pinto Mar 30, 2008

    I measured the voltages on the power supply board (APS208) as they appear to match the values marked in the pcb. The only one that I am not sure about is Vr, it measures 60VDC.

  • Luis Pinto Apr 01, 2008

    Help anyone? Thanks

  • Luis Pinto Apr 01, 2008

    I will try replacing the YSUS and I will let you know if if it fixed the problem. Thank you.

  • Luis Pinto Apr 08, 2008

    Actually I believe I just found the problem or part of it; the ZSUS board has a blown fuse. I will be replacing the ZSUS board instead.

  • robwaring Sep 20, 2008

    I have vertical lines of many colors that change when I change the channel or input - seems to be recognizing the signal but not properly rendering it. Fuses on the ZSUS board seem to be good. Anyone know of a fix or what to check? I have a basic multimeter but not much knowledge of how to fix these sets.

  • Evoo Dec 11, 2008

    The TV responds to the basic functions, on/off, volume and channel. However the picture has deteriorated to dark black and blue pixels with one vertical red bar on the left side of the screen about two inches thick.  The picture tends to darken as to almost black when the TV is on for a period of time. 




    any rough estimates of what this might cost to fix? I have no knowledge of tv's... 

  • Anonymous Apr 10, 2009

    the same

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  • LG Master
  • 19,396 Answers

Change the YSUS board, it often cause this problem.

Posted on Apr 01, 2008

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  • Master
  • 3,587 Answers

Sounds like your deflection circuit is weak..seems a power supply issue is at hand..what documentation do you have in your possession?

Posted on Mar 29, 2008

  • Patrick Michaels
    Patrick Michaels Mar 30, 2008

    well..not in the traditional deflection circuit approach..but the sweep oscillator serves the same function. Lack of voltage is usually the cause of most visual issues with these Plasma sets.

  • Patrick Michaels
    Patrick Michaels Apr 02, 2008

    crosses fingers...and hopes for a good outcome.

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Check this out

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have a nice day

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