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Need Diode part numbers for Philips Y-Main board

I have a Phillips 42PF320A/37 Plasma TV (Chassis # BP2.3U) with red flicker, (see and thanks to Premtech I've located two defected SMD diodes on the Y-Main Board. The reference designations are D5001 & D0018 and I'm unable to determine either Philips or commercial part numbers for these. They both have the marking F4 over 5J. The board is a Samsung PCB Code LJ41-02759A and Service Manual states that for Service it is a "Black Box" suggesting it's not repairable at component level and calls for board swap. I'd like to try and repair it.
Also, if someone the board schematic it would help me fault isolate associated circuity.

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  • Plka Bob
    Plka Bob Nov 26, 2007

    Did some more DVM testing and determined that U5014 is also bad but with no replacement part numbers, I chose to remove the board. I have emailed PTS on Friday for repair quote or replacement board cost and also how to register. Their site keeps redirecting me to a page requiring a username. They have not responded yet.

    I removed the Y-main board with the upper and lower buffer boards intact so as to not damage the boards. I am not sure if there are locking devices on the large black connectors CN5404 & 5504. Also is there a special tool for un-connecting CN5406 & 5506? (See photo)

  • dmt47 Oct 07, 2008

    I have a Philips 42PF7320A/37 with seven blinking lights. Repair cost through an authorized service rep is too high: $600+. After reading on line it appears my problems are in the Y Main or Y Buffer. Do you think PTS may be able to help with my challenge?


  • jdm979 Feb 09, 2009

    I have a Philips 42pf320a/37 plasma that will not turn on. When I plug it in it gets a green light then I hear a snapping sound then a red light flashes what seems to be a code of 6 long flashes then 3 short. Which i would read as 63. If I unplug it then plug it back in I get a sequence of 7 blinking lights. I have purchased a new plasma tv but would like to repair this on for my game room. Would like to repair it myself and am looking for advice.



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Not serviceable at component level, yeah right! They wish it isn't - it's a well known fact that electronics manufacturer's spare parts divisions generate more profit (with less revenue) than the retail units.

Long story short, we've serviced tens if not hundreds of those boards and we certainly aren't one of the biggest "unauthorized" service centers around.

I.e. we do not have a Samsung license and frankly, we don't need one.

LJ41-02759A is anything, but a black box and its weaknesses are well known within the service tech's community.

For D5001 you can use any 1A fast or ultra-fast rectifier diode with at least 200V reverse voltage. We use this:

If you need help, check out blog or contact us for service information.

Posted on Apr 30, 2010

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Old Drummer, that is indeed a BB board... It's propritary... It's that way because Samsung doesn't want Philips stealing it's ideas to make their Tvs..
The only authorized center for those is PTS Electronics and I believe Tri State Module is about to get authorization soon... Other than that it is not replaceable at component level and those part markings will do you no good - they're not in any list that you'll ever find...

Posted on Nov 22, 2007

  • William Rayburn
    William Rayburn Nov 22, 2007

    PS... Good job static testing to find two smts... Is that all you found wrong? No regulator failure?

  • William Rayburn
    William Rayburn Nov 26, 2007

    Old Drummer,

    No special tool to unbutton the buffers from the board, but that's fine just the way it is... Just call PTS 800-844-7871 and you should be able to speak with someone regarding the rebuild.

    Simply send it in - in a well padded box - and it takes about 10-15 days normally turn-around. Might be a bit longer with the holidays upon us..




This is a follow up for others with the same problem. Thanks to Premtech's advice, I sent all 3 boards to PTS and they resolved problem by determining that the lower buffer board was defective and they repaired it. I now have a great HDTV. Thanks again Premtech.

Posted on Feb 22, 2008

I have a phillips plasma that is also having this same problem. I suspect it is this same PCB that is bad. Did you end up getting yours fixed?

Posted on Feb 16, 2008

YO tengo un samsung que presenta la imagen con brisa a la mitad, despues nitida y mas abajo con brisa como si fuera un problema de horizontal yo quite la y main y la voy a cambiar para mejorar ya que presenta tambien recalentamiento por la parte de arriba y abajo

Posted on Aug 21, 2008

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