My portable DVD has sound but no picture on the monitor, I have hooked up to the TV and it all works fine on the TV screen but no picture on the portable.
Check the Monitor/TV switch on the side of the player.
The back light of the monitor might be defective. or the drive signal might not be getting to the screen you will need a schematic, multimeter, and an oscilloscope to troubleshoot this issue. This is how you will have to go about this using the schematic locate the screen test points measure the voltages with the multimeter and look at the signals with the oscilloscope. this will lead to you finding the exact problem.
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DVD WORKS BUT NO PICTURE OR SOUND
Same problem - works ok with TV, but not not its own
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