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Likely you have a heat related issue in the tuner. The picture cutting out is related to the tuner board over heating and signalling the power board to switch it off. The solution is to get better heat control on your TV. Try using a fan to see of this improves anything, and get a better ventilation to your tuner.
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Did you experience any storms recently? IE. the power cut off unexpectedly?
Bruce
LCD's use a colorful crystal see through display which only visible when light is shining through it. if you have sound and no picture it's always a faulty PSU. Very easy to change out actually.
if yo know how to solder , re solder your tv, second adjust the IF transformer by using the plastic or wood stick. IF transformer is looks like a cube made of metal with an adjustment screw at the top. try to adjust it and observe what happen.
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