Question about Philips Magnavox 9P6034C 60" Rear Projection Television

1 Answer

60" Philips Projection... Erratic red color.

Hey guys... I'd appreciate some insight if you could...

I started with the problem of needing a coolant fluid change... so I tried changing the coolant inside the TV... ended up dropping spilling some drops of old coolant on the board with my first attempt at the blue CRT. So, I stopped what I was doing, and removed the crt assemblies from TV and took out the board and went through a thorough and careful cleaning up of the fluid.

With the CRTs out of the TV, I cleaned the other lenses and changed fluids of the Green and Red CRTs.

So... I put it back together and with minor adjustments, I had the prettiest picture I've seen from the thing since I brought it home in 2000... I watched it for a couple hours before declaring victory and hitting bed.

Well, that didn't last long, apparantly after about 45 of viewing the next morning, the convergence went haywire. All 3 colors went nutty and none were on the same convergence... and after a couple minutes, I was left with wiggly convergence lines and no picture what-so-ever.

So... I thought maybe I missed some spilt fluid and went to work in re-disassembling the thing. I didn't see any evidence of residue anywhere, and even used some compressed air to make sure nothing was hiding.

I put it back together and found that I once again had a picture... but the red convergence was severely pulsing. The Blue and Green lined up fine. I used the convergence menu to get the Red as close as I could... but couldn't get it right. I noticed that the Red would be more tame when I toned down the Red intensity adjustment, but the first colorful picture that showed up on the TV would scramble the whole screen.

If I turn up the Red intensity adjustment... not maxed or even halfway... it hums (which is a reassuring sound) and affects the other two colors by causing them to severely flicker and sometimes shut off entirely.

I went into the factory adjustment screen in hopes to fix the convergence, and got things just about perfect... but as soon as I started watching something on the screen, the Red would again flare.

For now, I have the Red intensity adjustment turned all the way down... and am living with a mostly Blue and Green screen (the red still shows a bit)... which still looks better than the picture I had before I tried changing the fluid... I've also toned down the TV's color, brightness, and picture settings because when a screen of intense red or orange comes on, the tv tends to scramble...

Another thing that I tried was swapping the convergence connections for the Red and Blue... by hooking the Blue CRT to the red controls, I was able to easily converge the Blue and the Green in the factory screen... but the Blue control wasn't able to fix any of the pulsing of the Red CRT

So, any ideas?

Sorry about the book... but I figured more information would be better than less...thanks!

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  • PFFB Mar 20, 2008

    Thanks for the reply.



    So you think that the problem is within the circuitry and not the Red CRT itself? I suppose that is good news so long as the circuit board is still good...



    Any recommendation on the type of alcohol/cleaner? Tomorrow's holiday would be a good day to celebrate inside the back of the TV... so hopefully I can have an update by then.



    Thanks again.

  • PFFB Mar 21, 2008

    Winner!



    I thought I might need to use denatured alcohol... so I ran out last night to pick some up.



    Well, apparantly my thorough cleaning wasn't thorough enough. I guess the alcohol draws out any residue and when the alcohol evaporates, the tiny droplets of the glycol are left. Well, there was a considerable amount of droplets that were left behind.



    Another thing... I didn't take apart the retaining clips that hold some of the components to the metal uprights the first time, and clean the barrier sheets. I did that this time and found a couple that were wet, I guess the compressed air caused the glycol to migrate there. Oops.



    As for the boards... where I couldn't get a brush, I literally flooded with the alcohol and again used compressed air to flush out any residue and repeated until no more droplets appeared.



    It took about 2 hours, but I had the thing apart and back together and working... it took considerably longer to get the convergence back in shape. After chasing a moving object for the past couple of days, the red convergence wasn't pretty.



    I stuck a Cars DVD in to help reset the color intensities and focus... using the pause button to freeze a frame and set accordingly.



    Thanks again for your replies... it surely saved me some bucks and a number of late nights.

  • PFFB Mar 21, 2008

    Oh... and for anyone else who is reading this...



    If you're going to change your fluids, just take the CRT assembly out first. It's a 10 minute job (take them out of the front of the TV)... the connections are labeled pretty well that if I would have done before I started to drain the fluid, this would have been a 3 hour job from start to finish.

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I will try to help on this one.
Stay tune.

Posted on Mar 20, 2008

  • 1 more comment 
  • Jaime Hernandez Mar 20, 2008

    Great info you are providing.

  • Jaime Hernandez Mar 20, 2008

    Here's something you can try:

    If the coolant spilled on a circuit board assembly, I would suggest to remove that board and use a good amount of alcohol to clean it using a brush. The liquid coolant is very corrosive and even will become conductive if expose to a high voltage due to its oily and viscosity composition.


  • Jaime Hernandez Mar 21, 2008

    Just any rubbing alcohol will be just fine. Make sure you clean that circuit board really good. If the TV was fine before you added the coolant, then it should be still OK.

    Good Luck.

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