Question about Akai PDP4294 42 in. EDTV-Ready Plasma Television

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Will not turn on, only blinking green light

My Akai PDP4294 has been working fine for over 4 years. just a few weeks ago it went off suddenly when my son was playing game on it. I tried to unplug the power and plug back in, the front led will turn on red, then flash red, orange, green a couple of times and then blinking in green forever. I took the TV apart, 2 450V/330uF capacitors on power supply board were popping out on top, I replaced them, but did not fix the problem. the power supply board has only +5V working, 3.3V and other outputs have no voltage at all. All fuses are fine. I'm thinking about buying a new power supply board, but not sure if it will fix the problem. Any thought would be appreciated.

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  • customchevy Sep 28, 2008

    i have the same problem with the green blinking just started to try and figure it out. Did you fix your tv? i would like in detail what you did if possible. thanks john

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Ok, your on the right track... Check the main fet or fets that is located right by the caps. Normally if the fet is short, it will pop the fuse, but if your caps poped instead, it could have prevented this. With the set unplugged, you can take a meter set to ohms (lowest setting possible) and if you read a value across any of the 3 pins on the fet (short), then it shot.. If that checks out ok, then take a peek at all the other smaller caps that are on the hot side of the board (the bottom of the board will be labled hot and cold. If one of these was out, it would prevent any of the other voltages from being present. The 5v is a standard test signal, it will normally notify the rest of board to power up when there is a draw on it (kind of like a computer power supply). But I highly recommend replacing all the caps on the hot side of the board and it should fix your problems.

Posted on Apr 21, 2008

  • Greg Steilen Apr 24, 2008

    I forgot to add, if you test the vss on the power board (will be in DC volts) with the connectors going to the side xzy's unplugged and get a reading on the meter of about 190v then the power board is fine. Plug the left side driver in and do the same test, if voltage holds, thats fine, if it fails, your problem is at the driver board. Mostlikly a cap problem as well. You should be able to test the positive leads to ground, if you have a connection, then there is a short somewhere. Just need to follow down the line a bit and see where the problem is.

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