Question about Philips 42FD9954 42 in. Plasma HDTV

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42fd9954 42" plastma philips tv - power source seems bad - started with hard to put it on - then just no power. do you have a power supply part for this plasma tv?

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  • jglennwj Nov 03, 2007

    i've had the same problem. red on light comes on but tv will not turn on. after trying many, many times the tv will finally come on. now the power light will not come on at all. i've heard this is a common problem with this unit.

  • phxbill Nov 12, 2007

    I have the exact same problem. I've had it looked at, and the "power supply module" needs to be replaced - for $900!! Is there any way I can buy that part and replace it myself? If so, where is the best place to buy the part for the best price, and where can I find the repair manual? Thanks.

  • the body Nov 29, 2007

    hard to get set to come on plays different time lengths then shuts off

  • Anonymous Dec 05, 2007

    I have a similar problem-phillips 42FD9954/17S red LED is on,turn on gree LED on for 10 seconds red comes on constant blinking. Advised to replace power supply

  • the body Dec 09, 2007

    cuts of intermittantly

  • ERNO FUST Dec 13, 2007

    42" plastma philips tv - power source seems bad - started with hard to put it on - then just no power

  • hguinan Dec 18, 2007

    same red-green problem. mine started gradually months ago at power on with multiple red flashes & "clicks" before eventually going green after a minute or two. eventually that stopped completly with only a red led if that. if replacing the P/S is the answer then does anyone have insight on part purchase and installation steps for do-it-yourself'ers?. MFG help is $$ priced

  • CONSTRUCTORS Dec 23, 2007


  • tom_ee_nerd Jan 20, 2008

    I have the EXACT same problem as hguinan. Any luck on troubleshooting the issue. Seemed like you need to let the system "discharge" for quite some time before it would turn on. Now it will never turn on. A lot of money for a little used TV. By the way Philips was a bit "deceiving" on the warranties since they only covered the eBox and NOT the plasma. Did it turn out to be the power supply? Tom

  • Granky1 Jan 20, 2008

    We had the same problem, the push button kept having to be replaced every 18 mo. as it would start blinking red, & it was under warranty. this time to get it started it was in 6 minute increments, 6, 12, 18, min. fire it up My son had had problems with his x-box & was instructed to wrap it in a towel or blanket to get it to start. He suggested using a blow dryer near the power button & under the unit. It worked like a charm for a couple weeks, only taking 3-4 min. to fire up the plasma, then mu husband held it too close and it went dead. Now after a prior diagnosis that the power push switch was bad, the TV people are claiming it is the power supply for 800 plus labor. Start with the switch for $110 in parts. These units are kown to have bad push buttons. 3 switches in 6 years.

  • Anonymous Feb 24, 2008

    I have had the same problem with the green and red light and the clicks! My solution was to finally leave the tv on but a power failure turned it off and I have no red light. Need a quick solution...Help!

  • Anonymous Apr 04, 2008

    Mine will not even light up. No red or green light.

    Where would I start at. This will be my first attempt to correct the problem.

    Are there any parts on the power supply board that go bad all the time?

    Thanks for any help.


  • jglennwj Apr 04, 2008

    i had the same problem but it is now fixed. i removed the power supply board, sent it in and some guy i found on the internet fixed it for $279. i've never even opened the back of any TV before. it was similar to pulling out a mother board on a computer, wrap it up and send it out. took about 30 minutes to remove and another to put back in. my tv has worked good now since the super bowl. no fear of turning it off at all now. one of my postings here has the name of the guy that did the work in New Jersey (i think). i was afraid to use him at first but then said, what the heck. i paid him before the board arrived so i know i took a chance but i now have my hd plasma back.

  • jglennwj Apr 04, 2008

    here is the link to he page of the guy that fixed my power supply board. i-mail him, he is helpful.

    good luck


  • high_jinx21
    high_jinx21 Oct 10, 2008

    need to repair or buy new used one Phillips Plasma Power Supply 42FD9954/17S i have gone through 2 now need #3 can you help me?

  • jnjerge Jan 26, 2009

    Ii just bought a new Main power supply board and replaced it. I have the same exact problem. My TV will not come on unless I put a hair dryer pointed directly at the relays on the main power supply board. When I do that it comes right on and works beautiful. Now I have two P/s boards, yet I have the same problem. If I didn't have such a beautifull picture after using the hair dryer I would forget it, but I hate to let it go. Any ideas.

  • hguinan May 11, 2010

    to jglennwj..... right now I have mine sitting in the garage waiting for me to decide the right next step. keep me posted on how your repair goes since I'm still hoping to get mine fixed but for lose to $1k....I might just take that and get a new one w/lessons learned



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Not a fix, but it got my tv on.
I removed the back and tried the power switch.
I located the relay that was clicking.
I have two blue relays in the middle of my power board.
I placed a hair dryer over the relay for a few minutes.
After four tries of the power switch and it stays on!!!!!
Heat keeps the relay from just clicking off.
I don't know why.
This will at least get the tv on though.

Posted on Apr 12, 2008

  • Kevin Couronis
    Kevin Couronis Jul 09, 2014

    Just as a follow up....After the hair dryer thing, I did get a new board. It started doing the same thing a year later. Those recon boards don't get all new parts. If you are handy with a soldering iron, you can pull the square caps off and get replacement caps at radio shack. I did this and it works great now.


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My system is FIXED!!! Great recommendation on EBE Electronics. Removed the supply, shipped it to them and it was back within a week. The system fired up like new and now enjoying it again. It is disappointing that Philips won't own up to this obvious design flaw. Just looking at the supply board you can see the problem... a bunch of electrolytic caps and lower temp rated components sandwiched by 2 LARGE heat sinks. Not to mention that fact that there is absolutley NO circulation for the supply. So much to read about this problem on line. $50 fix it kit on eBay may also work but I think the $300 cost by sending it to someone who has the right check out equipment was well worth it just in case it was something more than the caps (heat is suspected to bledd of the electrolytes) and the MC34067P IC which is the suspected problem IC. Good luck to all. Never buying a Philips again... but at least I have a working Plasma again....

Posted on Apr 04, 2008

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To those of you using hair driers to warm up relays to keep tv on, each relay is fed through a highish wattage resistor. These can go high in value OR suffer dry joints where they are soldered onto the pcb. You could try resoldering them. This applies to any tv, monitor, or other display whether its plasma, lcd, or crt. Where there is a high wattage resistor, it can go dry jointed.

Posted on Aug 18, 2009

It has now been over 9 months and my phillips works fine. Ebcelectronics was the best choice. it was also the only fix i could find.

Posted on Nov 10, 2008

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The switch was replaced by a large elctronics repair store. The part, each time, was always on back order. If you google the part number it will come up under various suppliers. I do not know why the last part no. has a decimal in it. I could not find it on the web. the idiots who have my plasma are still trying to jack me around. I faxed them a copy of the repair from ebc electronics. I guess I have to call the morons again. Sure would be nice to have my TV back after 30 days. That or pick it up and take it to a larger corporation who is capable of multi-tasking on more than one tv a day......
BOARD/LED/SWITCH PANEL ASSEMBLY "Push Button" Part No. 312235721103 & 31221236006.3

Posted on Jan 28, 2008

  • Granky1 Jan 28, 2008

    just rec'd word he is replacing the regulator on the power source. Will know tomorrow if this is the solution. Will keep you informed


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To Granky1...where did you get the replacement switch?

Posted on Jan 28, 2008

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Same problem people, for months mine had been clicking. Then all of a sudden the red LED light just won't switch to green. I am thinking it is the Power Supply Module like you people said. Very frustrating!

Posted on Jan 24, 2008

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I have had the same problem and my philips 42" plasma went completely out. a tv repair shop said the power board is $800 plus anothe $200+ labor to fix.
i found a guy at ebcelectronics that fixed my board for $284 plus shipping. he did a good job and had good communication. i was leary at first but i trusted him and it worked. look up ebcelectronics on google and he will come up. it even has a pic of the board that is giving us all the problems.
i now have a SCAVIO problem with the same tv and i have ebcelectronics looking at it. the scavio is the board that all the peripherels plug into.

Posted on Jan 15, 2008

  • jglennwj Jan 25, 2008

    i am waiting for my repaired power board and scavio board to come back to me. if this does not work i will sell the parts on the tv to try and recoup some money so i can buy another. you can bet it won't be a philips.

  • jglennwj Jan 28, 2008

    the parts are supposed to be here tomorrow. ebc electronics said the scavio is fine and the power board is now fixed. he put it in a test tv and ran it for about 4 days with no problems.

    i will put both board back in when i get it. if it is still the same problem then i am giving up. it could be the power supply button but i'm not sure i want to cough up another $100+ on this thing. if it doesn't work, i'll be selling the power board, scavio and whatever else i can pull out. the plasma screen itself is only 2 1/2 years old but i'm not sure pulling it out and shipping the big heavy screen is cost effective for anyone.


Anyone of you thought about selling the tv for parts?

Posted on Jan 14, 2008

TriStateModule ( can your existing power supply board for $400 or you can look on ebay and sometimes find the power supply board. The part number of the power supply is: 312235721971 or 312235721972

Posted on Dec 04, 2007

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Usually the electrolityc capacitors will cure the problem

Posted on Nov 10, 2008

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