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I hane a Sanyo Model HT32744 CRT HDTV I purchased in April of 05 and for a year now it will drop out the red and green spectrum and the only color is blue and yellow. If I wack the cover it goes back to normal colors. The first time I did this it worked fine for over 3 months but now it is more frequint! I saw some websites that had comments on this problem like cracks in solder connections on the color board that plugs into the CRT and component problem on a PC board. Checked the connections on color board and they looked fine. It sounds like this a common problem with this TV. I was wondering if the PC board creating this color problem is available and where?

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  • overyjb Jun 25, 2008

    Are there any more comments before I take it appart again?

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  • Master
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I found the part number for the board, but unfortunately I couldn't find any for sale on the web. You might try contacting Sanyo directly. Here's the part number, hope it helps.

Sanyo Model HT32744 Main Micro board P/n E22459

Posted on Jun 25, 2008

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  • Master
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What I do with colour cast problems :-

1) check the voltage (with no aerial signal) on the collector of all three video output transistors (on the crt base) they should be +-5v of each other if one is different, then swap over this transistor with one of the other two and if color changes, its the transistor, If not then I use a 2k-4k wirewound and touch it from each collector to chassis in turn, and watch the screen (I use a mirror) each color should be equally bright with flyback lines, if not its probably the tube (CRT) faulty.

2) If all of tests are ok, then I find the three wires coming up from the the main pcb to the crt base panel and swap over the green/red and see if the color cast changes
If yes then its the chip on the main board, If no its on the crt base board, so check values of all the resistors there.

Posted on Jun 25, 2008

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  • Master
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Yes, check for any bad solder on the convergence module..

Posted on Jun 25, 2008

  • 1 more comment 
  • micromaster
    micromaster Jun 25, 2008

    and do a test on the IC, and capacitor, resistor on that area too..

  • micromaster
    micromaster Jun 25, 2008

    let me know..

    kindly rate my solution if this solve the problem..


  • micromaster
    micromaster Jun 25, 2008

    if you don't have any idea or professional background servicing that kind of unit, it was not advisable for you to work on that..

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