Question about Philips 60PP9202 60" Rear Projection HDTV-Ready Television

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Replacing Coolent Is it a difficult repair to replace the coolent in the lenses? How much is it to have someone do it verses doing it myself? My pictures convergence lines are blurry or fuzzy. Also I have a yellow hue in the middle of screen. I already replaced the ICs and resistors myself so is the coolent problem harder? Where do I get the coolent? THNX

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  • dvsax Jan 14, 2008

    I was told that the fuzzy red convergence crosshairs on the adjustment menu meant that the lenses need new coolent. I already replaced the ICs and resistors that cause the convergence issues. I just need to know the symtoms of bad or empty coolent. Another Fixya member says it is a new coolent issue. I found the coolent in a 3 pack for $55 at Tigerdirect.com. I also obtained the service manual. It does look extensive. I will try the repair when I can assure the problem is the coolent. I wonder what the cost of the repair is. WB

  • dvsax Jan 14, 2008

    Do you mean adjust the focus knob inside the unit? It's not the picture thats fuzzy, it is simpy a "fuzzy red glow" around some red or white edges of pictures. Then in the convergence adjustment mode of the standard user menu the red convergence crosshairs have a 'red fuzzy glow' under them and the multipoint convergence crosshairs are completely red fuzzy glows. I need to pinpoint the problem though for sure. I dont know what new or refilled coupling fluid is suppose to fix.

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I have the service manual, and it looks like this is a bit of a job. You also need a special coolant fluid, not water. Still, I can't think why this would need replacement unless it has leaked out or you were replacing the picture tube. Are you sure it's not a focus problem?

Posted on Jan 14, 2008

  • jsherman Jan 14, 2008

    You might want to try and get the set into Convergence Alignment Mode (062597 Status) and check out each gun individually. I can't imagine all 3 CRTs would need new coupling fluid. Again, have you tried adjusting focus? That's pretty easy to do.

  • jsherman Jan 14, 2008

    Yes, there are focus pots mounted in a block accessible from the rear with the panel off. Give that a try first. There are screen adjustment pots on the bottom you should leave alone. It sounds like only your red CRT is affected, so you should only need to adjust the red focus.



    The coupling fluid cools the CRT and also couples the output optically from the CRT faceplate properly to the lens. Since the idea is to cool the CRT, if it's really gone I suspect the CRT would not last long without it and may be damaged.



    If the focus adjustment doesn't work, I'd check the lens and CRT for debris that might be obstructing the image before I'd work on the coupling fluid.

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-Dileep


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1 Answer

Directions on replacing coolent


  1. Must be careful, projection coolent must not get on circuit board. It will short out. You must have a pump to suck coolent out of tv. Use alot of towels to catch dripping fluid.
  2. first take off lense
  3. then take out drain plug
  4. suck out coolent, be sure to either raise tv up to level off or have towel out to capture all fluid lost.
5 then when all out, clean all parts with windex or glass cleaner.
6 check gasket if bad replace.

7 refill with new coolent, remember to fill all the way.

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It's hard to tell for certain, but from what you're describing this sounds like the degaussing mechanism of the TV is either malfunctioning, or that there's some electromagnetic field around that keeps screwing with your TV. This could be caused by speakers, lamps, or any other electrical device. In any case don't hurry to spend 400$ on repair, it's been only three days, and there's a nice chance its not the convergence, or that you'll be able to find someone in your area that won't overcharge you. If there was any device added to the mix around the TV lately, remove it, and try plugging out your TV over night. If turning it off and on a few times won't solve it in the long run(that's the way you make the degauss mechanism work), you should look again into repair options in your area. Good luck

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