Question about Philips 42PF9630A 42 in. Plasma Television

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Tv wont turn on, red blinking light by the power light. How do I fix this?

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Plasmas can be a little tricky to diagnose. If you are comfortable with dismantling the TV and doing some multimeter (voltmeter) testing then, here's what to try. I need to express to you that what your are about to do can seriously hurt you if you aren't careful, The boards on plasmas can hold charges HOURS after the TV has been unplugged. DON'T FUMBLE AROUND! If you aren't comfortable using a mulitmeter to check for faulty circuits, then call the local repair guru. But if you're willing to learn something new and get that feeling of self accomplishment I'll help out in any way I can. This is going to be a long repair instruction aid:
First use a thick cloth or blanket on a clean work bench or table that you don't mind occupying for a few days. Lay the TV face down on the cloth with the stand hanging off the table. Remove the stand and position the tv for stability. Next, take the back off. There is about a million or so hex screws holding it in place on this model. Keep track of these screws, not necessarily where they all go, because they're all mostly alike. Once the back is off you will see five large rectangle circuit boards or different sizes, and four long skinny boards. Starting from the left side of your view you will see two long skinny vertical boards attatched to eachother and to a green board with a large heat sink they have 3 orange ribbons attatched to each one. Those skinny boards are the Y Buffers. The board they are attatched to is the Ymain or the YSUS (Y sustain). Next is a small board behind a silver tray holding the signal board. The signal board is easy to distinguish because it has all the input connections on it. Behind that one is the Logic Main. The largest board that is almost directly in the middle is the Power Supply Board, or the PSB. To the right of the psb is the XSUS. Along the bottom of the tv are two long skinny horizontal buffers that operate from the X sus.
You need to start with the PSB. Usually near the xsus is a visible sticker with voltages displayed. They coorespond to things like Va Vs Vsc etc. All of these voltages can be checked on the PSB. Look carefully at the PSB particularly to where the cable that connects the psb to the y main. Each of the terminals is labled. Its been a while since I've seen this particular board but often there are test points that coorespond to each of the voltages given on the sticker. Using your multimeter on the dc 200 setting, check to see if all your voltages are close to spec. If they are slightly, and by slightly I mean + or - 2 volts, that is ok. If they are any further off than that but not drastically off, there are adjusters for each voltage somewhere on the PSB. They look like plastic phillips screw heads in a 1/4 square metal housing. with your meter grounded to the tv safely, adjust these to find the correct voltage. DO IT SLOWLY, like GRANDMA IN MOLASSES IN MICHIGAN IN DECEMBER SLOW! If one of the voltages is severly off, replace the PSB and fire the tv up. You can try to rework the board, but trust you me, its not worth the time, risk nor effort involved. IF all your voltages are ok, then move on to the next likely problem. The Ysus. This model was made with samsung and LG parts and tv's from those makes also are plagued with this problem. The Ysus is most likely the problem anyway. They have a horrid tendency to burn out and to take the buffers with them. I recommend you replace all three. I don't know a sure fire way of testing this board accurately so you'll just have to take my word for it. The cheapest place I have found to have these boards replaced or repaired is on ebay, there is a seller with the tag of superdog**(something) and his name is Tri Nyugen. He lives in so cal somewhere and is where I send my parts (I've had two different tv's with these exact same innards, one was a phillips, the other a samsung, with IDENTICAL problems, the Ysus and the buffers). He does a great job and has lightning fast turn around. Tell him Captain_Axle sent you. Replace all three boards at the same time. If you don't you'll burn the new ones out quick. I am 99.99% positive that your TV will be up and running after replacing these boards. If its not, post another comment and I'll continue with the repair novel. Feel free to email me directly for help.
Good luck.

Posted on Feb 25, 2009

  • Axle80
    Axle80 Feb 25, 2009

    Just to clear which three boards I was taking about in the end there, the two skinny Y buffers and the ysus. You can get the part numbers off the boards themselves. You will have to remove the large screen brace to get access to the Ysus. Even then its a bit snug when taking it out.



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SOURCE: red blinking light

Hey ojustgowithi,

While this blinking red light may indicate a potential hardware problem, it may just as easily be the result of a built-in protection to prevent the TV from being damaged by power surges. To determine if this is the case, I would suggest unplugging the TV and all connected devices for a few minutes. If the TV operates normally once you've plugged everything back in, the unit may only have needed to be reset.

You may also wish to refer to your owner's manual documentation and troubleshooting FAQ for more information. Some model TV's will have error codes listed in the owner's manual that are dictated by the number of times a given light flashes on the front panel of the TV.

Hope this helps you out.

Go Ahead. Use Us.

Posted on Jul 24, 2008

  • 1 Answer

SOURCE: Red Blinking Power Light Sharp Aquos

What do three blinks of the power light mean on my Sharp Aquos LC-C5262U? I cannot power up my display.

Posted on Sep 07, 2008

SOURCE: My panasonic 42" plasma wont turn on, but the power light blinks

With this symptom, it is impossible to tell what the exact "Cause" of this symptom is. The LED's do not tell us what is wrong, sometimes it may indicate the "Area" in your case it is the X board. BUT thats NOT where the "Fault is" thats just the part that is affected. These days unlike the "Old" analogue days it just isn't realistically possible to fix anything but the most basic of problems with todays sophisticated units. This is quite apart from the Safety aspect, any unit that can cause a firs or have an explosion, or both, is NOT to be treated lightly, and and the repairer, of the unit is legally responsible, another thing to think about. Also, one must have tools, a Multimeter, a soldering iron, a deslodering iron, an oscilloscope, a signal tracer, tools, and most important of all, a Service Manual, without which, there is no way to even begin to understand and fix it, and more importantly Program it, AFTER it has been fixed. As these days a TV, is a PC, a Tuner, and an HDTV Monitor, and more, all in one. in the "old" days TV"s were more, rudimentary, and built to last for 20 years, and a "Parts" supply was set aside. They usually used to fail for only a few reasons, and they while still difficult, were less difficult to repair. Electrical knowledge was transferable, and they could be and would respond to, This-is-the-symptom-This-us-the-Fix, But that no longer applies, as now, it can be a Fault on I squared Bus, or "Sensor" failure, or it simple may have "Crashed" just like a PC, It could be a Diode go bad, and that will stop the whole thing. You see, in the day, the sets were Very "Fault Tolerant" because they were Analouge, and a faulty, component, or more sometimes, the set would always diplay something usually, and when they didn't it was one of anly a few things, sure there are always the horrid ones, and there are pleanty of those, but all in all it was quite easy. But with Digital Electronics, it either goes, or it doesnt, there are usualy few half measures. I mean thats the definition of logic either going or not. So it can take very little to completely paralyse a set, and generally give the only sysmptom, it can, by not working, usually No picture, or the like. So you, see the list is endless almost for any given SYMPTOM, as that is what is being seen, not the cause, as I keep going on about. Also any fault, usually involves the Power Supply, it is either the cause, the cause of the damage, or it is damaged. or ALL of them. Then after you have done the electronic repairs, you then must program the set to work, and align, and set up in general, any one of those settings missed or done wrong, back to square one. So, it is nearly always my professional opinion that one should always get a "Quote" form the manufacturers recommended service center, I cannot stress how important that last point is. It is even worth the cost of shipping. you see an authorised service agent, will have trained staff, trained on their brand, also they have first hand access to parts, original parts. This will actually save you money and ensure you can actually get it back fixed. Of course asking for a "Quote" also gives on the option of repair or replace. Often my clients,do not go through with repair, unless it is moderate, but in some of the more costly jobs they see it, as do i, that a replacement, with a warranty, is a better option. As an aside here, one could then tear the TV down, and sell the Known Good bits. You'd be surprised who needs parts, i myself often must by from third party sources to effect a repair. So money could be recouped, somewhat,and help out someone else.

Posted on Apr 17, 2010

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