Question about LG 42LC7D-UB Television
When turning on, the green light comes on and the screen stays black for much longer than it used to. Finally after 1 min or so the screen lights up with the input selection and the cable box shows the set as available. Then it usually shows no signal, and then invalid format, and then comes on. I updated the software, but that did not help.
This is a very common symptom indicating the the filter capacitors on the power supply board are beginning to fail. These parts are used by the power supply to stabilize the power from the board but they overheat and start failing after a few years of use. If you can do a little soldering then you can do the repair yourself by replacing the filter capacitors of the board. Below you will see a picture of what the capacitors look like when they start to fail.
And here is an article about failing capacitors:
There are 9 capacitors on your board to replace and once they are replaced the unit should be as good as new.
Here is a link to information showing which capacitors your board needs and the locations of the ones to replace.
I hope this helps,
Posted on Dec 07, 2012
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Posted on Jan 02, 2017
Your plasma TV has a power supply 6709900019A. These power supplies failed due to defective capacitors. See the picture below and check the capacitors mark with the red lines. There are 10 capacitors that should be replaced even if they do not show signs of bulging/swelling on top.
The value of the capacitors is 3300uF/10V but you can use 25 volts as long as they fit in the space provided by design.
Posted on Sep 24, 2010
I may put money that some one did stole your internal cable from the power supply to the main board !
Don't be surprised they did it to me at LG company .
Posted on Nov 15, 2010
The power on problem is a cap in the power on circuit. The loss of signal for an areal is delayed. Nothing you can for DIY.It needs repair shop visit.
Posted on Feb 12, 2011
Steve, that was awesome. Thanks a bunch. I already have the tools and I can get the solder easy enough. Thanks a again. I went to Best Buy this weekend and all they could say is that the entire board would need to be replace and that they really recommended a new tv as the cost for the new board would be as much as a new TV.... :( typical of them!
Posted on Nov 22, 2011
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