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.
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
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if you have power problem without blinking lights or standby lights (red) the possible problem is power supply board..However if the TV have blinking or standby light but won't turn ON..there are multiple cause of that and need further troubleshooting..
Are you saying the tv does not come on when you press the power button as it should? If that is the case - the philips tvs have a known issue with power supplies and if you have experience with electronics I'd say open it up and check the power supply for bad capacitors (bulged/leaking or busted caps) if you have component level experience replace them then try your tv again - ive fixed many philips tvs with this problem.
I don't have a fix, but the same thing happened to my Philips Plasma and the V repair man tells me that Philips no longer make the service pack which contained all the parts required to fix the TV. Basically Plasma screens run very hot and the components on the main board breakdown. So when the power supply goes so do many other parts. Philips used to supply all the bits in a service pack so it would seem that they (Philips) knew all about this inevitable fault from early production.
I am livid and if you paid what I paid then you are probably livid too. I expected it to breakdown one day but I never thought that it would be impossible to fix. I would never have bought a plasma if I knew it was considered to be a disposable item by the manufacturer. It could be worse, apparently Samsung don't support their TV's after 2 years.
I am phoning Philips in the morning and will post the results of that call if they have anything positive to say.
it isnt the Y-SUS board, it is the Power supply, iv fixed this exact problem twice in the last month, try turning the tv on, and when it turns green, unplug it real fast, while light is still green, after 15 seconds plug it back in, then hit the power button, if it dont come on, hit the power button again, this time, as soon as it turns off, hit the power button again to turn back on, sometimes you can trick the tv and it will turn on, at least i was able to do it, and once it comes on, it should work fine, untill you turn it off again.
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