Question about Samsung SPN4235 42 in. Plasma HDTV

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The TV powers up but there is no picture. I have replaced the power supply, Main Logic board and Y-board and yet the problem remains.  I have checked all of the recommended voltages and everything seems to check out.   What else should I do?

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  • Joe Knudsen Feb 09, 2009

    As I have stated, I have already replaced the Main Logic Board with no change.  I would appreciate any help you can provide in check the panel and other voltages.  Please feel free to call me at 8057205945.



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Your logic board is bad replace it and you should be fine unless your panel went bad i can walk u through to find out requirs volt meter

Posted on Feb 07, 2009


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Hi T Quinn.
Does the TV behaves the same way in all the inputs?
Does the color chances when the TV has been on for a while?
This failure could be in the main board, all the video info gets into the logic board from the main board itself.
I would suggest to check for proper voltages from the power supply to the main board, if all the voltages measure as expected. I would suggest to use a small cooling fan and place it near the main board.
Let me know if you require further assistance..

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The 24vdc is turn on by the signal from the main logic board, it is not always on, the standby 5vdc is always on. So yes it can be the power supply board is bad, but just to besure we need to find out if it is getting the turn on signal from the main board first.
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2 Answers

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