No picture or sound in my Panasonic TH-P42UT30A plasma TV?
Hi Ifixit,
I've got a Panasonic th-p42ut30a plasma tv that has a fault with it.
The standby light is on (red) but it doesn't come out of standby. Pressing buttons on the remote don't do get a reaction from the TV and pressing the buttons on the side of the TV itself don't get a reaction out of it either.
No blinking lights or anything to help diagnose the problem. Just sits there with a red standby light.
I'm not scared of getting my hands dirty by opening the unit and testing voltages. I just need some general help with what board to test or if possible, a repair guide on the unit.
Any help would be appreciated!
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5 opmerkingen
Ok so I've opened the unit. In the middle is the power board.
Standing behind the unit, to the left is another board that has rows of panisonic chips that is connected by a "V sus" cable to supply power from the power board.
To the right is another board which is also connected by a "V sus" cable. The board runs underneath a board that has all the input jacks on it.
I've checked fuses. All have continuity and aren't blown. I've tried unplugging the other boards and testing to see what happens.
When the left board is disconnected, I get a voltage of ~230v when the TV is first turned on. It then flashes a red LED on the front of the TV and power slowly goes down. The right board meanwhile gets the same and also 16v on it's 15v wire.
When plugged back in. The voltage doesn't rise. An ammeter shows ~4-5A running through and then back to nothing.
The TV doesn't turn on the whole time, nothing shows and there's no sound. The LED on the front stays green showing it should be on.
door Paul
The board on the left is your SC (Scan Drive) board and there should be two boards on the right, one being the Main AV input board and the other one the sustain drive board.
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