Question about Samsung SPN4235 42 in. Plasma HDTV

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Samsung SPN4235 fails to turn on..led blinks five times

I have an Samsung SPN4235 that fails to turn on...led blinks five times. I have replaced several parts in the set so far and get the same result. Seems like the logic board is bad because when I unplug it from the power supply board I get voltage at the majority of the test points on the power supply board. I swapped out the logic board but the same problem occurred when I plugged the new board into the power supply board. I'm at the point now where I'm not sure what to do next. Any help would be appreciated.

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  • Arlen Aug 01, 2009

    No, I haven't tried running the set with the Y buffers out since the set won't even come on. Seems to be in some type of fault protection mode. Anyway, the only way I can get voltage at VA, VS, VE, etc. is to unplug the logic board which is listed as CN803.

  • Arlen Aug 02, 2009

    I have already went through the unplugging each connector scenario to figure out which board has the problem. That's how I figured out that the voltages show up when the logic board is unplugged. The problem now is that I replaced the logic board and the problem is still the same. Is there anything else you can recommend to me?

  • Arlen Aug 02, 2009

    Can anyone else please give me some other recommendations about which direction to go with my problem? Everything I have done so far is listed above this comment.

    Thanks

  • Arlen Aug 02, 2009

    Good news is this is just a set I picked up and wanted to see if I could fix it.

    Thanks


  • Arlen Aug 02, 2009

    Looking at my previous comments can anyone say for a fact that it's probably not the power supply board?

  • Arlen Aug 02, 2009

    So far about 20 capacitors and one IC on the power supply board. I don't think any of the parts were defective though. The logic board was also replaced. I also re-flowed all the solder joints on the power supply board.

  • Arlen Aug 02, 2009

    Anyone else?

  • Arlen Aug 05, 2009

    It did end up being a bad power supply.

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Replace the power supply

Posted on Aug 02, 2009

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Have you measure the power on voltage from the main board. The problem could come from main board so it would not give correct order. Try to get power supply stands alone (unplug all loads) except the main board, then measure the Vs on when the set turn on. If this is OK, you could then re-plug each related board one and measure each time and see if there is any voltage drop causes by a shorted board.
For the Y board- you have to swap with the new Y main + buffers to avoid buffers got shorted and kill the Y-board (it happened to me). Do not forget X-board, it hard to fail but it happens.
You can use your eye to exmine those silicon glue on the IC on the buffers, if it look brownish or dark yellowish, the board has been shorted. If you need service manual, let me know, I could find it for you. Good luck

Posted on Aug 18, 2009

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What parts have you replaced? Have you tried the power supply board?

Posted on Aug 02, 2009

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Hi arlenj,

looking at the previous comments and the complexity of the problem. i just want to be honest that this may be a good time to get a new HDTV.

no need to accept or reject this answer, im just giving an honest opinion, not an answer.

regards pal,

voodoo

Posted on Aug 02, 2009

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  • Samsung Master
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The panel could be shot, or it could be a pcb inside, such as L-main, Main, or Y-main, if you open it up and check all the panel voltages you could find the board with the problem by unplugging a board at a time and then seeinfg if the voltages come up, the voltages are on a sticker and the test points and pots to set them are on the power supply board and the DC-DC board. Hope this helps and have a great evening!

Posted on Aug 02, 2009

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