Question about Philips 42PF7320 42 in. EDTV-Ready Plasma Television

2 Answers

No picture, VSCAN issus.

I have a 42 in Philips that is about two years old and the picture no longer works. When the unit is turned on there is no picture and you hear sound for about 3 seconds then it stops and the light on the front blinks 7 times. I have followed some of the directions here to troubleshoot the issue and have narrowed it down to a VSCAN issue. I have removed the back cover and when the power switches off the green light on the power supply blinks 3 times. The code on the PS board says that 3 = VSCAN. When I remove the wire that is labled VSCAN from the PS board and power the unit up the sound stays on but there is no picture. I do not want to take it to a repair shop as they have told me they charge $250 just to look at the problem. What is my next step? Do I need to replace the PS board? Do I need to replace some capasitors on the PS board? Is there a different board that I need to replace (VSCAN). Thanks in advance for any assistance you can offer.

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  • 2 more comments 
  • bwana247 Jul 18, 2008

    I have identified the Y-main and Y-buffer (2) boards. They do not appear to show signs of overheating but I have not removed them from the system to inspect the rear of the boards. Is there a way to identify if the voltage from the PS to these boards is correct? I was able to do some testing with a meter and it appears that there is less than 5VDC going out for both the VSET an VSCAN.

  • bwana247 Jul 18, 2008

    There is no hissing sound.

  • bwana247 Jul 18, 2008

    Thanks for the advice. However, if I was interested in having a technician do the work on my set, I would not be on this site. The only qualified (per Philips) technician within 50 miles wants $250 just to look at the set and they said it is most likely a PS issue and would charge me $675 to replace it. I can replace the unit at todays prices for about $900 (paid $2300 2 years ago). If I blow the set I am no worse off than where I am now NO TV!

  • bwana247 Jul 18, 2008

    I am looking for assistance in identifying the problem down to the exact board and possibly even down to the defective component on the board. I am sure if I just went in and replaced all the boards that the system would start working again but I can't afford, nor is it my desire, to spend a few grand on a set that can be replaced for less than 1K. Any assistance that can be offered is greatly appreciated.

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  • Philips Master
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If you hear a kind of hissing sound then is a faulty ballast

Posted on Jul 18, 2008

  • 4 more comments 
  • Ginko
    Ginko Jul 18, 2008

    Three flashes is reserved code, it means a major fault. If it is accompanied by an hissing sound this mean a faulty ballast, the sound ends when safety switch takes power off and returns flashing code.
    I can find the replacement part, however I suggest calling in an expert repairman for mounting it.


  • Ginko
    Ginko Jul 18, 2008

    Sorry, this is a plasma I was typing solution for traditional rear projection, plasma is much easier. Just replace Ysus board.

    About testing the Ysus, you should really not be in there messing around. You need to set voltage drop across R36 to -200v within 1/2
    volt. That is enough voltage to
    completly ruin your TV if you make a mistake. Find a qualified technician to do this for you.
    Or take the risk and replace the whole Ysus with a Y sus kit.



  • Ginko
    Ginko Jul 18, 2008

    Here you find a replacement board, inquiry them with an email if you can't find the part on website.
    Or post model number here.

  • Ginko
    Ginko Jul 18, 2008
  • Ginko
    Ginko Jul 18, 2008

    You can find Y-sus kit for a cheaper price on Ebay.

  • Ginko
    Ginko Jul 18, 2008

    Well, it should not be done by a non expert repairman. In any case, to test your Ysus you need to measure across resistor

    R36. and then set it to -200 +/-.5v.
    Get a DVM, set it to the 1000v DC scale. connect DVM on the two sides of the resistor. DVM should read around +_200vdc,
    I do not know what polarity, but it is not important at this stage. If reading is wrong replace the whole Ysus kit.


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