Question about Projection Televisions
On main board (central one covered by heatsink), Measure on cold start voltage at tab of U42 if less than 1.75V replace U42 (You need a decent multimeter for this measurement.).
If you also have/had scrambled picture issues check C414 (470uF16V) near LVDS on main board.
Posted on Jun 11, 2012
If all the voltages appear normal, I would suspect a main failure because in many LCDs the power supply will power up only after all the voltages circulates through all the circuits and check OK.
You can also have the TV connected to the main power source and press the ON and monitor the voltages at the moment you press the ON button.
Posted on Jul 11, 2008
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