If i hit the back of the tv the picture comes back for a few minutes then goes again
You have answered you question yourself:
You have a loose connection inside---may be a plug or connecter inside or a physical problem on one of the boards or even the main display panel.
Someone has to open it and see what they can find by probing the chassis in different areas.
SOURCE: HI WHEN WE TURN OUR
I suspect you have a poor contact on the video processor board or the upscaler itself on the screen.
Check all ribbon connectors and look for any components that have got very hot, there may be a dry solder joint beneath them.
Hope this helps.
SOURCE: 42 inch lg tv powers on,goes off after about 30 seconds
hello my friend you have some loose connections on the digital board.this board is located right in the top center of the tv.if you do not have repair skills call the repairman he should not charge you too much for this job. good luck
SOURCE: Have LG 42 inch plasma, 1 inch black line down
Sounds like the middle scalar board is defective. Since the issue comes and goes it could just be a loose connection to the between the scalar board and the PDP Module (plasma panel).
Great caution needs to be taken when checking this connection because it is a ribbon cable connection it and needs to be put in correctly aligned or it could cause a short in one of the circuit boards.
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