Question about Philips 42PF9431D/37 TV

2 Answers

Hello: I have a Philips 42 inch Plasma 42PF9431D/37, Chassis number BJ2.5u PA which has the infamous 7 blinking led problem. When first turned on, the power light is green as normal for about 10 seconds as the TV tries to turn on. Then after that, the raster on the screen shows up for a half second and then the TV turns off and the LED light color switches to red and blinks 7 times fast, over and over. No other blink sequences appear except for the LED8001 on the power board which also blinks 7 times. To my surprise, the board itself has the "Alarm Signals" indicated right on it and it clearly states that "7. Ve" I assume that this is a reference to the 7 blinking LED. My board is NOT the usual LJ44-00117 that so commonly has the 8059 and the 8060 caps blown/bad and if I read about the bad caps one more time, I am going to put a shotgun to my own TV. It is not, I repeat, NOT a bad cap problem as in the 117 board. My board is LJ44-00119a instead and I assure you, I have checked all the caps with an ESR meter and this board does not have any 10v 3300uf caps as the 117 does. As you perhaps can tell by now, I do know my way around electronics repair to some extent, and have repaired this same type TV 2 other times just in the last month. However, this one has really got me stumped. I did also check all the fuses, including the pico fuses, and even replaced them for good measure just in case I missed something and that did nothing. I even checked all the FETs and the IGBts as the service manual described. All check out fine on the Y and the X SUS boards. The buffer boards checked out fine as well from their check points. From there, I proceeded to unplug the YSUS, then the Buffer boards and then the XSUS to try to narrow the problem and no matter what sequence that I unplug the boards or even all at once, I still get the same 7 blinking error. I have narrowed down the issue to be speciffically with the Ve on the power board itself after checking all the voltages on all boards in all their appropriate test point locations. The Ve is lost down to 6 volts when it should be 110v on the power board itself. I first assumed that this was an XSUS problem, but as I said already, the XSUS checked out fine according to the service manual and even unplugging the XSUS resulted in the same error code and the same 6 volts in the Ve of the power board test point. I checked all the common components around the Ve area on the power board that I could including diodes, resistors and caps, even replacing some just for good measure, but all attempts to fix the issue, only result with no change at all. My final straw was to perform a google search with all my advanced ways of searching to filter out some of the **** that does not help me. The closest that I came to figuring this out was that another person had the same issue and simply replaced a ceramic fuse on the YSUS board. This did nothing for me and I honestly think it was a fluke for him and his problem will someday soon return. And oh yeah, tricking the TV to turn on with all the ways that one can do this with a Philips plasma, also did NOT work. A software upgrade does not work either. The TV won't even stay on for more than 1/2 second. Can someone please help me with this issue before this gets the shotgun repair? Thanks

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  • Jeramie
    Jeramie Mar 23, 2011

    Thanks for the reply, but as indicated in my original post, I have checked all the voltages and the Ve is the one at fault and only 6 volts instead of the 110.
    I don't feel that you answered my question in any way and I hope that I didn't just pay $12 dollars for a generic answer.
    Do you have any experience with the question at hand?

  • Jeramie
    Jeramie Mar 23, 2011

    Great idea about the supplement 110v line for testing. I'll try that if I can come up with a simple way of doing it. Might have to build a power supply of my own first though.
    To answer your other question about a new board, the very last thing I do is replace the whole board. It's the easy way out and not always the most economical method. So that is my last resort. I'll keep you posted.

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  • Master
  • 325 Answers

Let's start simple. Have you tried, or are willing to try a new power supply board? I've had times where the read outs of all components are fine and finally before I was about to break it, I just stayed simple. I ordered a power supply replacement (new NOT "refurbished") and it corrected my problem. Secondly, your Ve is 110v?! That is on the sticker itself on the back of the panel? If so, and you were desperate, you could always run a line from the HOT main 110v to the XSUS that would supply the 110v needed (testing perposes only, not long-term use). Update me on what you find out.



THANKS!

Posted on Mar 23, 2011

  • Andrew P.
    Andrew P. Mar 23, 2011

    Thanks for the 110v comment. I'm sorry I just work through things by asking questions. I've played with plenty of tvs with Ve issues, but from my experience my ratio of win/lose with Ve is mostly lose. I have successfully found component level issues for Ve correction before, but the odds were always stacked against me. Let me know what you find out after the 110v supplemental testing

  • Andrew P.
    Andrew P. Apr 01, 2011

    Agree with silverdragon. I ALWAYS start with the power supply. Hopefully the supp 110v line will give him a marker as to WHICH part of the supply is faulty. Capacitors generally fail for a reason, be it engineering faults or other components at fault. I didn't, and wouldn't just jump for the easy solution of "replace capacitors." They fail for a reason and in your cause wouldn't assume them to be at fault. Hopefully, he has supp'ed his 110v and has figured out more.

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  • Philips Master
  • 12,061 Answers

Hi, i see all the time these people who think that every fault in a unit, is a capacitor, when it simply is not.
While caps do indeed go "Bad" just replacing them seldom will permanently fix anything. What most miss is that also there is "Other" damage done to "other' even seemingly disconnected componentry.
As said usually we have a fault, the cause, the damage done, and the co-lateral damage ALL must be found and repaired, or the fault will simply reappear, in one form or another.
Accordingly whenever we embark upon a repair the very first place we MUST start, as I tell all my students, is with the Power Supply.
Here we must check ALL voltages, as if they aren't correct here then NOTHING can nor will work correctly anyway.
So to check said supply one simply MUST HAVE a service manual.




Posted on Mar 23, 2011

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