Question about Philips 42PF9936 42 in. HDTV-Ready Plasma Television

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We have a Philips Plasma 42" model 42PF9936d that was turned off all summer. When we returned home and tried to turn it on, the tv will power up for just a second, and then shuts right back down. The indicator light goes green, and then off to red. We have to manually push the button on the side of the TV to even attempt to turn it on again, but it never stays on. Thanks!

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Posted on Jan 02, 2017

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SOURCE: plasma won't stay on red light flashes and shuts unit off

I had similar problem with 42fd9932, run for a few secs or minutes, shutdown and flash red led for ever. Fans in this unit were not causing shutdown although I could stop one and get the red led flashing thing.
Replace c2212 100uf, c2508 4.7uf changed to 10uf, c2664 100uf. I also added clip on heatsink to U7203 8.5v TO-220 case regulator( next to c2212) and a drop of oil to each fan(poked a hole through label center). Something else I did was add a 47 ohm 5w in parallel with fan ps 100 ohm 5 w resistor.
These parts are all located on the two power supply boards. Use Caution 380V is present on these boards. Allow a few min for caps to discharge.

Posted on Nov 04, 2007

  • 7 Answers

SOURCE: 42" Philips plasma screen goes black

You have a Ysus problem. Sounds like a cold solder joint or loss connections on ysus main board.

Posted on Jun 07, 2008

  • 52 Answers

SOURCE: 42" Philips plasma screen goes black

you need to replace y-sustain board.

Posted on Jul 25, 2008

mumma_1
  • 903 Answers

SOURCE: 42" philips plasma

when a television turns off by itself and flashes as you say, it indicates that there is a problem inside the tv. If you keep trying to turn it on you may do more damage. It could be something as simple as a faulty fuse inside. If you have no expierience with electrics I suggest you get it checked out by a professional. I had a similar problem with another tele model and it was the fuse in the back of the tele that needed changing. I did try to this on my own but unfortunatley didn't have the right fuse so i took it to a repair shop and he done it really quickly.

Posted on Oct 23, 2008

  • 1 Answer

SOURCE: Philips 42" Flat Screen Plasma - blinking red light 7 times - HELP please!

I had the same issue with 2 of these sets. It ended up being 2 capacitors were bad on the power supply. They are located towards the bottom of the board, you can visually see they were buldging and leaking slightly. I replaced them with 2 I salvaged out of an old computer (of same values) and the tv works as it did before.

Posted on Jan 08, 2009

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42" Philips plasma screen goes black


You have a Ysus problem. Sounds like a cold solder joint or loss connections on ysus main board.

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The Philips Plasma TV have a problem with electrolytic capacitors going bad. I believe you heated some capacitors and your problem may return. If so, try replacing 2540 (100ufd@25v)
and 2508 (4.7ufd@50V).

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