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Won't power on.

I have a Philips 46pp912a/05 rear projection tv, it worked but not a great picture, I cleaned a lot of dust from the main circuit boards and now it no longer powers on, starts on 1 green light then goes to 2 green lights and 1 red one, after a while all 3 start flashing which doesn't stop, ps, this is a UK tv and I am a novice, although I can solder should it need new capacitors. Checked all connections are fine on the boards, the 3 coloured bulbs no longer light up, there is no service manual available to download from the philips website, and they have not answered my email regarding this...any suggestions? thanks.

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  • paul Jun 03, 2014

    wow i only just seen this, again lol sorry for delay try herehttp://www.cqout.com/item/PHILIPS-46PP91...

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  • 79 Answers

It may not be a fix but here goes,before this answer MAKE SURE THE POWER IS NOT ON, note where the switch is and follow the wire to main boaed, look for a plug on the end of the wire lift the plug and put it back on a couple of times also press the power seitch on and off do this a few times fast, hope this help's, paul.

Posted on Feb 14, 2014

Testimonial: "Hi, thanks for the suggestion Paul but no luck with that one."

  • 2 more comments 
  • paul Feb 14, 2014

    sounds as if when you cleaned it you could have knoced a plug in the set, igoto flea-bay, oops rbay type in the mofrl followed by psu you may get lucky :)

  • bri watson
    bri watson Feb 14, 2014

    I've since had all the circuit boards out, given them a good clean, and reseated all connections, no signs of blown capacitors, but the largest circuit board below the front screen has signs of some connectors looking a bit black on the board, don't know what they are but they look like some kind of small cap (no ally on top), but not being a tv guy I don't know if they would affect power on? Can't find any help or parts anywhere, maybe it's just too old..like me :-(

  • bri watson
    bri watson Feb 14, 2014

    Suspect??

  • bri watson
    bri watson Feb 21, 2014

    Well seems like nobody can help with this! I have now sourced a service manual for this set and have found a possible fix, just waiting for parts to arrive to try it.

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techman
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SOURCE: Hitachi 50EX20B Bigscreen TV

You can download a PDF from here: http://www.servicemanuals.net/results.aspx?type=SM&brand=0&model=50EX20B Make sure that the coolant is not leaking out onto the printed circuit boards. i have had the remote sensor cause this problem before and also I have had bad capacitors in the sweep and the main power supplies. Good Luck

Posted on Jun 14, 2007

ctf1800
  • 4402 Answers

SOURCE: Flashing Green Light on Front of 73" Projection TV

on the signal board replace the caps by the 5/9 volt regulators. c2p04 is the main culprit. 6 caps in total can be changed. I believe c2p05 also.

Posted on Dec 15, 2007

  • 2 Answers

SOURCE: Toshiba 57H81 Flashing Red Power Light, Blown Fused F850+F852

Solved by resoldering some solder joints!!!!!!!
********
Toshiba Model 57H81 Rear Projection TV - Purchased 11-09-2001

Problem: Toshiba 57H81 Flashing Red Power Light, No Picture/Sound, Blown Fuses F850 + F852

Symptoms January, 2009:

  • Upon turning on set I got flashing red power light and nothing else.
  • Removing plug for one minute and plugging in results in:
    • Audible click, steady red power light for 2 seconds then slow flashing red light
    • Pushing power button results in steady red for about 2 seconds then slow flashing red light, no other set activity
  • Removing power cord for several hours and plugging back in made no change
    • Audible click, steady red for about 2 seconds then slow flashing red light
  • Possible related note: Over past several months occasionally the entire screen would flicker momentarily and at other times be problem free for weeks.
  • Fuses F850 and F852 found blown

Repairs Made:
  • PD0074 DEF/CON Power Board
    • There are two main power supply capacitors in this set. They are C-809 and C-810. One their negative lead on the printed circuit board re-soldered leads and nearby contacts. I’m told that because the factory left out a printed circuit board eyelet, the connection will come loose over time. When I called Toshiba customer service they said there was a known solder joint problem causing blinking red light.
    • Replaced blown fuses F850 and F852.
      • I actually installed a fuse panel on the inside of the cabinet and routed the fuse connections here instead of ordering the special fuses and replacing them on the circuit board.
      • Had to use a 5 Amp SLO-BLOW for F850. Fast blow does not survive power up. Get the red blinking light.
      • Used a fast blow 2 Amp for F852.
  • PD0073 SIGNAL Board
    • Re-soldered Q751 + Q752 STK392-110 Convergence Amps
    • Re-soldered adjacent pads that looks suspicious

Total Cost to Repair about $10
  • Twelve hours of my time over three days to research issue, disassemble set, make repairs, add fuse panel.
  • Already owned Service Manual and Circuit diagrams from a different 2004 repair.
  • Less than ten dollars at Radio Shack for fuses and fuse panel. Already had wires, etc.
  • Some solder. Already owned de-soldering tools, etc.
  • Visited both local authorized Toshiba factory service repair facilities. One said repair would have to include replacing Q751 + Q752 STK392-110 Convergence Amps with ST392-180, and realigning set for a total of $500+ and it would be more if they had to order a power board. NO THANK YOU! Other shop said $65 for site visit and $30 to make an estimate that could be applied to repair.

Posted on Jan 05, 2009

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