Question about Philips 46PP9302 46" Rear Projection Television

5 Answers

PHILIPS 46 IN REAR PROJECTION ---- no picture, chirping

Tv is approximately 6-8 years old. had a Sears wty that we had to keep purchasing because the tv broke down every year. we cancelled our wty last year. always breaks down around january or march. united radio has always come to work on it. have replace boards. last time this happened i asked why the same board would go again and they said it was a different board this time, which we felt was odd. TV picture goes - black, no sound other than a chirping noise. is this something we can fix ourselves - we've spent more in service contracts over the years than we did for the tv!!!!!! Same problem on my 46 as well.

I believe the chirping to be coming from a Diode #6304 on the Large Signal Board, but i'm not sure what to replace. I could replace Cap # 2313, but not sure. Anybody fixed one yet??

Cheers,

Greg

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  • 4 more comments 
  • greglamont Jul 21, 2008

    Just to clarify, my set is a 46PP862/79 (Australian Model) - a DPTV325 Chassis.

    I already have the Service Manual, but need a little more guidance on where and what to look at next. Power supply is good.

    Cheers,

    Greg


  • greglamont Jul 21, 2008

    Any more details somebody can share with me?

  • greglamont Jul 21, 2008

    Replacing the Large Signal Board is an option. I'll contact Philips Australia to get a quote on price, but guessing it could be a little scary!! This seems to be a common fault with this model. Has anybody worked on and fixed this fault??

  • greglamont Jul 21, 2008

    Yes VOTIT, I do have the complete Service Manual with schematics.

  • greglamont Jul 21, 2008

    "jithinantony" just posted "try to check the circuit board". There's an interesting thought!!

  • greglamont Jul 21, 2008

    Thanks Dan,

    VOTIT just suggested the HOT as well. I have been over the board looking for bad resistors and solder joints, touched up a few but still nothing.

    I have uploaded the service manual to :

    http://www.server382.com/download/Philip...

    Will leave it there for a few days.

    Thanks again for your help.

    Cheers,

    Greg


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  • 3,459 Answers


Its the HVG - AKA Flyback. You can get a new one for around 130.00 

Posted on Nov 28, 2008

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The "chirping" is usually a sign that the power supply is attempting to startup and is failing. This can be cause by a number of things. Check the common failure items first:

1) Horizontal Output Transistor. This is mounted onto a heatsink and is located close to the flyback transformer (part with large red wire out the top).
2) Check for cold solder joints - Look at the modules and resolder any joints that appear grainy or have rings.
3) Check the area of the convergence ICs for Pico fuses or low valued resistors. If the fuses are blown or the resistors appear to be burned, that is an indication that the convergence ICs are bad and could be drawing down the power supply.

I don't have access to Austrailian models, so I can't give you any more details. If the service manual is available electronically, I'd be happy to look at it and give you more specifics.

Dan

Posted on Jul 21, 2008

  • ABRsvcs Jul 21, 2008

    I'll look over the manual tonight and update this in the AM.



    Dan

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Try to check the circuit board

Posted on Jul 21, 2008

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I would suggest replacing the whole Large Signal Board.  It is very hard to identify exactly where the problem is and would probably waste more of your time and money

Posted on Jul 21, 2008

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The power supply section is not working.
Common possibilities are:
- Convergences amps have failed overloading the supply
- High-voltage section (flyback transformer) has failed
(happens sooner or later, about 8 years typical))
- CRT tube has failed overloading the supply
- Power surge has popped the power input circuit.
(Fuse, rectifier diodes, turn-on relay etc)
- One of a hundred of electrolytic capacitors has failed short overloading the supply. They dry out with age, are cheap to replace, but hard to find which one it is,and it is caused of chirping sound....

Posted on Jul 21, 2008

  • 2 more comments 
  • LORETO LACARON
    LORETO LACARON Jul 21, 2008

    is your manual like this have a schematic diagram so i know the voltage out at the last page of this manual has a schematic...



    Training Toshiba PLASMA TV PDP 42WP37


  • LORETO LACARON
    LORETO LACARON Jul 21, 2008

    Somehow I can't help but think that
    you have a shorted Horizontal Output Transistor (H.O.T.). It's easily
    replaceable if you can identify which transistor is the H.O.T. (BTW, it's
    usually installed with a heatsink if you care to look). If you decide to
    replace it yourself then DO NOT USE A GENERIC REPLACEMENT!!!!!! Using some
    cheap knockoff is likely to not do the job and you'll just be wasting money.
    Insist on using only the genuine Magnavox part number.



    Click below for the picture of (
    HOT) transistor of PHILIPS magnavox….





  • LORETO LACARON
    LORETO LACARON Jul 21, 2008

    i forgot to paste the (HOT) transistor,find this transistor with heat sink...

    Phillips F8 chassis


  • LORETO LACARON
    LORETO LACARON Sep 02, 2008

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A cheaper way is a DIY but it seems like this failure is not a DIY.
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