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Lcd goes dark after 15 minutes

\015 Screens works for 15 minutes and then can hardly see anything. I change the inverter board and still same problem. Could it be the screen?\015\012thank you\015

Answers :

More likely the power supply. If you have the ability, use a ESR meter on the caps in the power suply. I think you'll find that several caps are old and failing.
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