Question about Philips 42PF9431D/37 TV

1 Answer

Power Up Problem

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!

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  • radio_davio Aug 13, 2008

    Wow, that was quick! Thanks, I'll give this a try this weekend.



    Any chance of getting a link to layouts of the boards?

  • radio_davio Aug 13, 2008

    Wow, that was quick! Thanks, I'll try this this weekend.



    Any chance of getting a layout of the boards? Or any other technical data?

  • radio_davio Aug 27, 2008

    Woo Hoo! I fixed it!!!! We finally started leaving the set on all night, but the power company strung new wires on our road and cut our power. The tv never came back on after that - do our die moment with the wife not happy!



    The problem was in the power supply, must be the 8.6v section as gooruflash suggested.



    There were two radial electrolytic filter caps that were obviously puffed out on the top. The pair were rated at 3300uf @ 10V, and considering the small physical size for that rating, I bet they fail in a lot of tvs of this model. All of the other electrolytics n the power supply looked much more robust physically per their rated values than the baddies.



    The way the pair was laid out in the circuit, it looked as if they were filter caps for a +/- supply, so I went with an appropriate rated part that what was available locally for replacement: 4700uF @ 35V.



    The new caps were considerably larger and axial instead of radial, so I had to solder wires (used heat srink to cover the joints) and then CAREFULLY tie wrapped the replacements to a convenient strut inside the tv.



    I was a little concerned about radiated noise from the wires, so I twisted the wires and made sure that the wires were positioned as far away from the other electronis as possible.

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  • 36 Answers

You have a 8.6v supply error according to the 7 error code being displayed, what you can try is when the set goes to blinking disconnect the Y sustain board (if looking at the tv from the back the board on the left) from the upper left side of the power supply, if the error code stops then you know your Y sustain board is pulling down your power supply and causing the error, if the error code continues you have a probelm with your Logic Board (located under your Small Signal Board) disconnect this from the Y sustain board and see if the error code stops if it does you know that the Logic board is bad, if the error code is still blinking then the 8.6v supply line from the Power supply is faulty and the Power Supply needs to be replaced

Posted on Aug 13, 2008

  • Dan Ferrante Aug 15, 2008

    You would need a service manual , you can try to google the model number online to get one

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SOURCE: Power Up Problems

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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Posted on Jan 02, 2017

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