Question about Philips 42FD9954 42 in. Plasma HDTV

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I have a philips 42PF9631D/37 and it will power on and the light stay green the screen seems to light up but there is no pic or sound. Please help i love this TV

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  • shadow_morga Jul 15, 2009

    ur right its not my first post and thanks. No there no menu or anything that ill come up. I have read in other post that the Power supply seems to be the cause of alot of the problems but mine isnt doin the same thing as the other post.

  • Devon Sacco
    Devon Sacco May 11, 2010

    I see that this isn't the first time you put up a post regarding your Philips TV. Are the other posts related to the same TV?

    Going from this post alone, It doesn't seem to be in "Protection Mode". Does the Menu display still pop up on the screen when you press the menu botton on the remote?

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  • Master
  • 1,077 Answers

Normally what happens with Philips TVs that does have a power supply problem, the TV detects a bad circuit board and goes into " Protection Mode ". The TV turns off and the red light starts blinking. With the TV having the green light ON, and no menu display coming up on the screen and no sound, I would believe the main mother board is the issue.
But, I can't say it's 100% the problem because I can't actually look at the tv over the internet. I can only make guesses with the symptoms.

You have a few choices:

1. You can try leaving the TV unplugged for 30 - 45 minutes so the TV can discharge and reset itself.
2. If by chance the TV is still under warranty, go that route.

3. If you have some electronic experience, if you can find and purchase a Service Manual over the internet; It will help you diagnose the source of the problem and fix it by soldering in the new part or replacing the board. The Service Manual will give you red light blinking codes, circuit diagrams, test points, and part# lists.Usually, cost under $20. And most cases the new part to solder in cost less than $15.

4. Pay a TV shop to do the repairs. It maybe costly, but get an estimate of how much they will charge. That way you can decide if it worth repairing or replacing the whole TV.


I hope I shed some light on the subject for you.

Posted on Jul 15, 2009

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  • Philips Master
  • 5,568 Answers

If you have eliminated other potential sources of trouble such as a missing input signal from cable or satellite box, you have a partial failure of the main power supply. If you have a later 2nd set, I would try that first to make sure there is a signal for the set to see.
The power supply assemblies are normally on separate boards from the main one and in a plasma set you may have two power supply boards; one that services all the lowre voltage needs and a high voltage supply for the plasma tube itself. If the latter one fails, you would probably still have audio but since both sound and picture are missing, the problem is likely in the main supply. Power supply boards can be fairly easy to find; look for boards that have larger components on them; cylindrical cases (capacitors) black blocks (chokes and transformers) and beefy-looking semiconductors. I would check with the mfr. to see if they have an exchange program or only sell replacement assemblies. Power supplies are fairly easy to repair with some techincal training so if you are forced to buy a replacement, don't discard the old one as there are smaller independent companies who will repair them for a few dollars less than replacement cost.
If you plan on opening the set to peer inside, please pull the AC plug overnight as there are dangerous voltages present for some hours after being without power.

Posted on Jul 15, 2009

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