Question about Philips 42PF9630A 42 in. Plasma Television

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I have a Phillips 42 inch plasma T.V. The lower half of the screen will randomly go black.With a whack to the left middle of the unit the situation is resolved.I also have a continued set of colored lines on the upper 4 inches of my screen which will not go away.

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  • shanrocker Feb 01, 2009

    I'd the exact same problem with the lover half of the sreen going black. If I tapped the screen, it would go back to normal. Now the lower half is all distorted. It's not black anymore but now all fuzzy with all sorts of colors blended in. I'm so bummed! Any ideas for a fix?

    Thank you!

  • holleyhaisch Feb 11, 2009

    Thanks for the helpful advice.I now know I cannot fix the problem aloneand the repairman is on the way!

  • gbtr Feb 14, 2009

    There is a vertical black line approx 5" wide on the left side of the screen, any idea's?

  • akee68 Apr 02, 2009

    The bottom half of my screen is fuzzy with red corlored dots. The top half is ok.



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I wanted to share my solution to this problem. Not only is it an easy fix (aside from taking the tv apart) but it also explains some of the strange methods I've read that have worked, such as taking out padding from behind the boards or putting a magazine under one side and even tapping on the tv for a temporary fix.

Granted its only been a few days of it working but I tell you this....It's not done the half black screen once! And trust me when I say it was doing it constantly.

Ok so first off the problem definitely lies in the upper/lower buffer boards. On the model mentioned by the OP (same model I have) it's located on the same side as the power button (right side when you are looking at the tv).

Ok so you've got the tv openned face down on a non static surface. Btw I was shocked at how many youtube videos I found of ppl working on their tvs while its laid flat on their sofas!

When you are looking into it you will see on one side there are two vertical boards hooked up to another board more towards the center. These two boards are your upper and lower boards that provide the upper and lower picture. The problem I was having was in the lower section of the tv going black so obviously that corresponded to the lower board. (They are labelled upper and lower if you look closely)
So here is what I did:

I noticed the lower board was not sitting flush so I unscrewed the one screw on the bottom and noticed how much of a gap was in the screw hole. The problem was it was screwed down in such a way that one of the connections going to the main board was not making it's proper connection. So I just gave it a little push towards the center, held it, and screwed it back down.

That's it! It's fixed now. No need for replacing anything. Just poorly drilled holes and a few things not lining up correctly!

So hopefully anyone else that's having this same problem might have some luck in using this fix. Good Luck!

Posted on Mar 15, 2009

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Not to be arguementative, but these buffers aren't difficult at all to replace. The hardest part is ordering them. If you have any sort of mechanical inclination or even if you have experience with legos, you can do this repair. Here goes:
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 or philips screws holding it in. Keep track of these screws, and 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. There will be two large metal braces that run vertically along the TV. You may have to remove the one on the left to get access to your buffers and Ymain. There should only be a couple of bolts holding it on. Once removed you'll see a bunch of circuit boards, the ones on the left are the ones needing your attention. Starting from the left side of your view you will see two long skinny vertical boards attatched to each other and to a green board with a large heat sink. These long skinny vertical boards have orange ribbons attatched to each one. Those skinny boards are the Y Buffers. These are what you need to replace. The board they are attatched to is the Ymain or the YSUS (Y sustain). Most commonly the buffers and Ymain go out together. But start with replacing the buffers. You can find a part number on each of the boards, it will be labled with P/N: or Part: and will likely have a description written underneath, like Ybuff or Vert-buff. If you can't find it. Take a picture of the board and email it to me and I'll point it out for you. From there go to or the cheapest place is ebay, and order your buffers. Now there is something to be aware of here. The buffers and the Ymain, the larger rectangle board they are attatched to, all work as a compensating circuit. You may be fine just replacing the one piece, but like changing only one lightbulb in a fixture of four, the others will go out sooner because of the different signal given by the new part. I recommend changing both buffers at the same time, but if money is an issue, just pull them both and look for any tell tale burn signs. That'll be the buffer you need to replace. Yes they are different. Upper and Lower. If you can't find a burn mark, replace the one that cooresponds to the problems on your screen, black or funny lines. But like I said, you'll be better off to replace both. The buffers are held in place with a couple of mounting screws each and the ribbons are usually on with pressure clips. Unsnap everything, remove it carefully and reinstall and reverse your dismantle. If you get stuck or have any problems. Email me with pictures and I'd be happy to walk you through it.
Use common sense with any repair. Make sure the TV has been UNPLUGGED for an hour before starting. Not just off, but actually disconnected from the wall. This give the capacitors time to discharge. If you were to call in a technician to do this repair, it would take him 1 hour and would cost you over $700. Do it yourself and save $500.
Good luck.

Posted on Mar 04, 2009

  • Axle80
    Axle80 Mar 04, 2009

    Just one more quick disclaimer. This solution relates to HORIZONTAL lines, Vertical ones may be a result of just a weird setting in your menu, or if the picture is missing not just moved over, you may have a bad X buffer. They are the long skinny boards running along the bottom of the tv. Procedure to fix is relatively the same. Keep in mind that the Xsus is the board to the far right of the back of the tv. That may need to be replaced. X buffers rarely go out. But this should give you a place to start.


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You need to have a technician verify the correct upper and lower Y buffer boards for your TV's. These are common failure items and are not for the novice to replace.

Posted on Feb 01, 2009

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