Question about Philips 50PF7220A Television

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Phillips Plasma Error

I have a Phillips 42PF9630A and it has started to shut itslef off after I power the set up. The sound comes on without a picture and after a few seconds the set shuts off. Then a red LED on the front blinks slowly six time and then quickly three times. Any ideas or suggestions?

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  • wv_armydog May 20, 2008

    I feel fairly confident in replacing the board myself, but want to be certain I order the correct smps - is there anyway to varify the part number by inspecting the current component? Also, what would I have to do to check the Y & Z sustain boards for shorting?



    I appreciate your time and expertise.



    - Armydog

  • wv_armydog May 21, 2008

    Is there somewhere I can go to get a general schematic of the set (not wiring schematic) but something like an exploded view so I will be able to identify some of the components you mentioned (e.g. Ic's, z & y sus, etc.)? Also, will prolonged use of the set with a bad smps cause additional damage to other systems?



    Thanks again - you have no idea how long I have been trying to find someone with some answers.



    - Armydog

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  • Master
  • 934 Answers

That unit is a BP2.2UAA chassis and from the sympotoms you're describing you have a power supply problem. The power supply is an smps (switch mode power supply) Philips p/n# 996500033880 and available at Vance Baldwin for $473.58 plus shipping, which includes a $250.00 core which you can get back when you ship them the old part.
If you buy the supply yourself and attempt the repair it's a simple plug-n-play but you should also check the Y & Z sustain boards for possible shorting.
Bill

Posted on May 20, 2008

  • William Rayburn
    William Rayburn May 20, 2008

    Armydog,

    That is the correct number for the smps. In fact the original part number will actually sub to that number I gave you for that unit. However, you can goto http://www.VanceBaldwin.com yourself and click-in as a guest and put in the model number youself. When you get a list of parts click on the power supply and follow any sub part suggestions if that one is NLA - and it will be.

    As to the testing - this is where it gets a bit tricky. Philips has what's known as a Force32 program. Techs such as myself spent a few thousand on this program and that's the only place I have any access to the schematics for this unit and you will need the schematics in order to do some testing. There is no way to get what I have to you with the best hacks in the world. You'll also need a DMM (digital multi-meter) and a 100mHz scope to do it right... Since I know some of this is way over the casual home repair let's try the McGyver approach. Unplug the Z-sus board and power the unit without it. If everything is okay you won't get a picture but you should have sound. The next step is just dumb luck - - power the unit down and carefully check the fuses and along the Ic's mounted to the heat sinks on the z-sus, if ANYTHING looks burned or suspicious pay and have it tested - if not - then plug in the z-sus and power it up. If you have ANY feedback from the smps pull the plug and consider sending the z-sus in for testing.

    Bill

  • William Rayburn
    William Rayburn May 21, 2008

    The ONLY block diagrams, schematics or exploded views I'm aware of would be in the service manual itself. You may get lucky tracking it down through SAM's... Philips is a rare breed that is propritatry paranoid. So even SAM's might not have it...

    Best I could do for you is to explain that most LCD and Plasma in the larger sets look very similar in layout. After removing the back the Y-sus will be on your left the Z-sus on the right. Directly center and usually up towards the top a bit is the smps with the logic, analog, digital boards below. To the extreme left of the Y-sus is the upper and lower Y-drive boards.

    Most connectors have their voltage values printed on them, on the board, next to each pin they represent. Makes it fairly easy to do some voltage scans with a dmm..

    Other than that I'm afraid I can't be of much help with locating layout. But if you run into any questions along the way or need to identify something drop me a mail or picture if you need to and I'll try to help.

    Bill



    premtech@willapabay.org

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