Question about Philips 37FD9954 37 in. HD-Ready Plasma Television

3 Answers

Philips 37fd9954/17 Plasma flashing red light - found 1 problem

I just picked up a non working Philips 37fd9954/17. Originally it did nothing and I began surgery. The main fuse was blown, so I tried replacing it and it blew again. I found the main problem to be a shorted power mosfet (One of the two STP15NK50ZFP). I replaced them, checked all 9 fuses and gave it a go. When I plug it in, the red standby light comes on and stays on. When I turn on my tv, the green light will come on for about 10 seconds, (no picture or sound) then will flash red until i turn off the set. When i try again the same thing happens. What would be likely to have also gone out with the mosfet?

ALSO... On the back of the power supply board, there is a black wire juming from a FET to a transistor. there is also a small glass diode jumped across 2 pins of a 16 pin ic. Are these supposed to be there?

Suggestions on what to look at next?

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  • Seth Alison
    Seth Alison Jun 05, 2010

    I would also like to add that I got this TV not working. The flashing LED on the front has just a constant steady flashing to it. I have the service manual already. The previous owner said that a tech looked at it and that it needed a new 'power source.' I am pretty sure that she meant Power Supply. Shopjimmy has been out of stock for 2 months and counting...

  • Seth Alison
    Seth Alison Jun 07, 2010

    Caps are good, and yes I can solder and use a meter. I figured that was pretty obvious from my first question. Last call for suggestions?

  • Seth Alison
    Seth Alison Jun 07, 2010

    Thank you for all of your assistance! I will find you if I have more problems!

  • Eric Fernando Nov 08, 2012

    I have same problem with my PHILIPS 37FD9944/01s. did you fix your problem.

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3 Answers

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  • Master
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What exactly do you mean by jumped accross the pins of an IC? Can you please get me an image so that I can help you with your problem. The diode you are talking about is called zener diode. The possible source of the problem is the voltage regulator IC however I would like to see the image first. Please upload it to imageshack.us and get me the direct link so that I can have a look.

Posted on Jun 07, 2010

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  • Seth Alison
    Seth Alison Jun 07, 2010

    I removed the diode and the jumper and misplaced the part. the diode was a small glass zener / signal diode between pins 7 and 8 of IC7650 - MC33368P / CPBY0325. I drew in the location of that and the jumper. The set acts the same with or without them in place. The pictures show both the bottom and the top of the area I am descibing. I did replace most of the capacitors except for the 5 largest ones. I may just pick up a new supply board if and when shopjimmy restocks. I would love to get this one fixed though.

    the other larger 16 pin IC on the board is a MC34067P/CPCW0323

    thank you!




  • eagle338
    eagle338 Jun 07, 2010

    I can hardly see a thing. Please upload the images to imageshack.us and get me the direct links to the images. It does look like its fried though. Meanwhile I will check my collection to see if I have a service manual for this model.

  • Seth Alison
    Seth Alison Jun 07, 2010

    http://img69.imageshack.us/img69/359/pla...
    http://img709.imageshack.us/img709/6302/...
    http://img689.imageshack.us/i/plasmaboar...
    http://img687.imageshack.us/i/plasmaboar...



    The 2 mosfets I replaced are on the skinny heat sink in the middle of the board.
    the 'fried' look may be just a result of desoldering
    Uploading took awhile - sorry.
    Let me know what you think


  • eagle338
    eagle338 Jun 07, 2010

    From the images you have sent me the capacitors look like they are damaged. The tops are not flat. Possible leaked electrolyte? The first thing I would do would be to replace them since the problem you are talking about sounds like a voltage drop related. Can you tell me how many times the red LED b links in between each pause?

    Sai.

  • Seth Alison
    Seth Alison Jun 07, 2010

    the LED doesn't stop flashing at all. It just flashes steadily forever. I will order some new caps and maybe the IC's too.

  • eagle338
    eagle338 Jun 07, 2010

    Ok. If problem persists let me know and we will initiate a comprehensive troubleshoting procedure. I don't have the schematic for this one but I have found it online.

  • Seth Alison
    Seth Alison Jun 07, 2010

    Cool, I did find the service manual and it looks like the jumper and diode are supposed to be there based on the schematic. Thank you!



  • eagle338
    eagle338 Jun 07, 2010

    You can use our repair directory to search for a tech if you are in the US. Enter the zip code and choose tv tech from the drop down menu from the left hand side and click search. Pick the one closest to you, call him and fix an appointment.
    http://fixya.com/repair


  • eagle338
    eagle338 Jun 07, 2010

    SOrry I posted that here by that here by mistake. Yes it did not look like the diode really jumped that's why I did not mention it.

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  • Philips Master
  • 1,210 Answers

I have not repaired this model. One of the most common problems are the capacitors. You will need a cap checker to locate these. Hmm.....Look over the powerboards......You may see two or three capacitors that may be bulged or skinned. I would most certainly look for these. The capacitors are one of most reason these TVs go down. And in many cases easy to replace. Good Luck and thanks for asking!

Posted on Jun 05, 2010

  • 1 more comment 
  • Seth Alison
    Seth Alison Jun 05, 2010

    I have tester all of the caps with an ESR meter and they all seem fine. I have not used a capacitance meter since that involves testing each one out of circuit. No obvious swollen or bulged caps. All diodes check fine too. I have not tested the tiny surface mount ones. I found a Power supply 'kit' on e-bay containing 9 new capacitors and a 16 pin IC. There are only 2 16 pin IC's on the board. This person is asking $80 for the kit. HAHAHAHA - right...

    Any other sugestions?

  • matt martin
    matt martin Jun 06, 2010

    A good clue is the fact this E bay source has a kit with 9 capacitors and a 16 pin IC. I must stress, that a bad cap may show good with an esr meter. Thus a dry or shorted cap will test good in circuit. Unfortunately you may have to remove, to the best of your knowledge the bad cap or caps and test out of circuit. I know it is time consuming...and repair may require lots of patience. Now, one other test is to check the Microfarads of these caps. This sometimes is a lost art, as techs rarely go this far. Well anyway, thought I would touch base with you. Let me know how you are doing! Later alligator!

  • matt martin
    matt martin Jun 06, 2010

    PS...I would just check the electrolytics for now....the suface mount caps are pretty reliable!

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  • Master
  • 1,099 Answers

Hello
The problem can be solve by the following
you have to read the glass diode and the transistor by the use of a multimeter to check for defected one but if otherwise Ur power supply board is dead, u know basic electronics’ and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get ur tv power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
Thanks for asking

Posted on Jun 05, 2010

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