Question about LG DU-42PX12XC 42 in. Plasma HDTV

1 Answer

LG plasma TV won't power up. Don't hear that loud click of relay

I want to try to make a long story short, but need to give a little background. I have an LG plasma tv, model DU 42PX12X, which has a well known problem with its control board. There are extensive posts about the problem on this site and others. I've pulled the bad board and attempted to re-solder bad connections on an integrated circuit that's been identified as the problem, but in the process I've developed additional problems. First my remote control quit working, but I can find no connector that's loose or any other reason why the remote would quit working as a result of opening the back of the set, moving the two large AV boards out of the way, and accessing the control board. Other than checking all connectors and fuses, I have no idea how to troubleshoot the remote. Worked fine before opening the TV. While handling the TV, I accidentally pushed the power button that's located at the bottom left of the screen, but that's it. Can't thing of anything that would cause the remote to go out. I've re-checked the connector to the buttons at the lower right of the screen, which also connects the infrared eye, many times with no luck.

My second problem is that the TV will no longer power up. I ran the TV several times with the AV boards moved out of the way and several connectors disconnect, as suggested by a poster on this site, and I had no problem. The last time I did this and attempted to see if my soldering had repaired the control board, I did somethign different. I unplugged a couple connectors to the AV board that I hadn't unplugged previously with the TV on. One of the connectors was to one of the fans, which I understand could cause the power to turn off. That's what happened; TV was on for just a minute or so and then shut off on its own. I've reconnected the fan, and all other connectors, but power won't come on. I've checked and re-checked all connectors, and all fuses that I can see, but no power. When I press the switch, one of the red lights on the AV boards comes on, and I can hear humming from the main power board, but I do not hear the usual loud click from a relay or whatever it is that you usually hear a half second or so after turning on the TV. Any ideas about the power and the remote will be appreciated. I have the new control board installed.

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  • LG Master
  • 76,099 Answers

If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/Plasma TV troubleshooting procedure is given. Faults to all brand Plasma displays are similar.

Posted on Feb 27, 2017

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6 Suggested Answers

6ya6ya
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SOURCE:

Hi there,
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Posted on Jan 02, 2017

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ThaMp3Doctor
  • 8596 Answers

SOURCE: Have sound, but only bright mostly yellow vertical lines

Since I haven't heard back ,I am clearing this from my queue. Best of luck.

Posted on May 30, 2008

  • 1 Answer

SOURCE: DU 42PX12X LG

having the same problem. an authorized Lg service center is at a loss. LG is not helpful at all. Now worried that it may not be fixed. Let me know what you have found. aldinger@sco.edu

Posted on Jun 25, 2008

  • 1 Answer

SOURCE: LG DU-42PX12X Verticle lines of various colors, and widths throughout the screen.

Check within you area for a reliable LG repair center. To fix the problem of the blue, red or green vertical line you just need to replace the control board PN 6871QCH038C. The part cost about $150.00 and a honest repair center should not beat you up to bad on the labor. Good luck and Good viewing.

Posted on Sep 10, 2008

  • 298 Answers

SOURCE: Loud pop Blank screen 42 inch Viore Plasma

Unfortunately, that board is the inverter board. And for this model the inverter board is only supplied with the the PDP panel. The panel is quite expensive, here's a link if needed:

LG 42PX5D Replacement Part PDP Plasma Display Panel

Posted on Dec 29, 2008

sullivan8733
  • 11 Answers

SOURCE: LG DU-42PX12X

Check the controller board, 6871QCH038A. This board is one layer deep into the assembly after the cover is removed. Gently lift the covering circuit board back plane to access.

To do this direct a blast of cold air unto the large chip in the center of the board. If the picture comes back on then you have found it. This means powering the TV while open and this means danger to the novice. Voltage can end your life when you become the circuit path.

Order Part number 6871QCH060Q as the suitable replacement part to this circuit board.

7060 State Road 84 #12
Fort Lauderdale, FL 33317
(800) 432-8542
Fax: (954) 723-9044

Posted on May 04, 2009

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Have sound, but only bright mostly yellow vertical lines on my LG DU-42PX12X .


Since I haven't heard back ,I am clearing this from my queue. Best of luck.

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3 Answers

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Check within you area for a reliable LG repair center. To fix the problem of the blue, red or green vertical line you just need to replace the control board PN 6871QCH038C. The part cost about $150.00 and a honest repair center should not beat you up to bad on the labor. Good luck and Good viewing.

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