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Try with that... http://www.filestube.com/3c4e959f7e53ba6703e9,g/PHILIPS-42PFL7932-LC420WU5-V2-CIRC.html
Symptom: Sound but no picture.
Cure: Master or Slave inverter is defective. It can be that the driver IC is defective or MOSF inverter transformers, or 470uF 35V C Replace driver IC BD9897FS or MOSFET's. 996500046243 IC BD9897FS 996500046242 Mosfet FDD8447L 996500046241 Zener KDZ100V
I have the same problem. No video just audio. No on screen display visible either (volume, channel labels) nothing.
Samsung tried to repair this under warranty TWICE within 2 months. Second time they replaced circuit board and it worked for another 8 months. So I paid $1.500 for a TV that died again after 1,5 year - this is ridiculous.
I have no idea what the reason might be and I wont try to fix this since samsung tech could not fix it without replacing circuit board.
Check the power supply module voltages first, it should have 5vdc standby voltage at all time the minute the TV is plugged into the wall outlet, try turn on the TV, then the main 5vdc, 12~16vdc and the 24vdc should be on. Look at the supply for burnt parts, blown fuse, etc.
It sounds like you have a Power Supply Board problem. The PSB is the center Board (towards left) after you remove the back off the TV. Remove Board from TV with the 6-7 screws. Replace capacitors CM811, CM812, CM817 & CS806; 1000ufd 25volts.
It is most likely the inverter, here is a trick to check it.
Turn the tv on a channel where you have audio(sound)
Take a flashlight or a lamp with a bare buld and shine it on the screen.
Look very closely at the screen, if you see a video image your inverter is bad.
Let me know and I can instruct you on replacement.
based on this info what happened is this someoe accidentally changed the setting on where the sound was to be inputed. by unplugging it you returned the tv to default. hope you can rate me thanks for asking and letting me know how it turned out. S