Our LG TV model number 42LB5500 suddenly lost both sound and picture (black screen). Don’t know if this is connected, but for a few weeks prior to the failure, the top left corner of the picture kept going slightly darker and then returning to normal, every few seconds.
I’ve replaced both the main board and the power board, but this hasn’t fixed it.
Anybody have any ideas please?
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Hi @philtoni ,
Don’t know the answer but maybe the service manual may help.
There appears to be 3 different chassis versions for the various model variants so try the one applicable to your exact model.
Usually the service manual has troubleshooting flowcharts for various problems like No Power or no video/audio etc.
Here’s an image of the No Power troubleshooting flowchart for a LA49B chassis just to give you an idea
(click on image to enlarge for better viewing)
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