Picture pulsing, tv turns off and on
My Philips picture pulsing, tv turns off and on
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Product Troubleshooting for Philips
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Sounds like a power supply problem, If you are competent with electronics, you may find some blown capacitors or resistors on the power supply board. Equally you can probably buy a new power supply board.
WARNING: the power supply board contains lethal voltages even when switched off and unplugged. If you are unsure what you are doing take it to a repair shop.