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Subject says no sound but picture, but problem is mentioned is have sound and no picture. Which is correct? Anyhow try the following: Try changing the input device to something you are sure, works such as a DVD player. Look for any loose contacts in RC jacks/sockets/Cable.
it is going to be a failure of the Z sustain board if you can see dark video. you can either replace the Z sustain board or the IPM that is bad on the Z sustain. the board is about $175.00 or so part number is 6871QZH034 I THINK.
This condition, sound no picture, is generally a result from a failed y-sustain and/or x-sustain board. You can check the fuse for continuity or resistance using a multimeter. I am helping someone repair their LG 42pc3d, that's why I thought I'd help you out too.
Y sustain board6871QYH053B Z sustain board6871QZH056B
One of the SUS panels will be defect.On these panels you will find several fuses,the panel with the broken fuse must be replaced.
Sus panels are the panels with the big cooling blocks.
Our 42" LG picture is also split down the middle. It doesn't matter if it is cable or a DVD. I would love to know if anyone has found out the solution to this prob. The TV is only 3 years old...
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