Question about Philips 42PF9431D/37 TV

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Power Up Problems

Good morning,

Our Philips 42PF9431D works fine, once it finally powers up. Here's a description of the problem:

TV is off. Press power button and the green LED lights up and the screen is blank. After about a minute, the green LED goes on and the red LED blinks 7 times and goes off. The red LED will cycle the seven blinks continuously.

If we unplug the TV and try this again, and again, eventually the TV powers up and works fine all day.

When this problem first appeared, the TV only needed to be unplugged once. Now we're up to 10 or 12 times, unplugging and re-plugging the power cord from the wall.

I've repaired CRT monitors, power supplies, mother boards and such for a living for many years and possess the tools and background to attempt a repair on my own. But with the cost of a plasma TV, I'd like to gett all the help I can before pulling electrolytic caps all day looking for ugly ones.

Help me!

Posted by on

  • radio_davio Aug 20, 2008

    Thank you!!! Good advice. Since we have not yet tried to pull the tv off the wall to poke aound, I will have this info handy when we do.

    Since the replacement boards cost almost as much as replacing the tv, I'll have to try repairing myself.

    Until then, we just leave the tv on and let the satellite receiver go into its own sleep mode at night.



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7 blink error is 8.6 volt error on that model. usually tied to y sustain board located on left side of set looking from back. disconnect y main from power supply and power on and if comes on verify power supply primary voltages located on label on pdp itself. if voltages present you would need to replace that board as not designed for component level repair. however if you find failed components like swollen caps or burnt ic's you could replace those. also when replacing the y main board there are two y buffer boards to left of main board that also would be recommended to be replaced at same time as they work as circuit and replacing one board without other could cause failure to other boards still in set

Posted on Aug 19, 2008


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