Question about Philips 42PF9966 42 in. HD-Ready Plasma Television

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Bad power supply and regulator circuit

I have a Philips 42" Plasma, 42PF9966/37 that after being on will shut down and blink red with a clicking sounds like it is trying to come back on. Took it in and they said I need to have the power supply and regulator circuit. I have pulled the back off as suggested and do not see any issues with any caps. Is it a bad power supply board and if so, where can I get one? Thank you!

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  • jlafave Jun 25, 2009

    I actually replace the main power supply board. Based on what the TV repair shop said, that would solve the issue. They were wrong. When the new one was in it worked for about 3 hours so I shut the TV off and put it back on the wall mount. When I turned it on again, the problem started all over again. It is a huge pain that I changed the supposed problem but my tv is still not fixed and doing the same thing as before. To make things worse, there are no other repair shops in the area. Any other quick things to check?

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I had the Same issue. on a 50PF9431D/37 set. Many Plasma Set's use a LJ44-00118A PS-505-PH Power supply from Samsung. Known to have this common problem. If you can, or have a friend that can Solder components?. Unplug your set remove the back panel & locate your power supply. It will be the PCB in the center of the set just above the Video/Audio connections. http://www.shopjimmy.com/power-supply-unit-lj44-00118a-from-philips-50mf231d-40.htm. Is a Link to a photo of the PCB. Make a note of the locations of all cable connections then unplug them all. Un-install PCB, Check all Fuse first. I believe their is 5 or 6 of them on the PCB. Then replace the two 3300uf 10v 105C Radial capacitors at C8060 & C8059. Look to see if the Caps are deformed and or split at the top. The location of the caps are in the Lower bottom edge of the PCB. A local shop may Carrie them if not, digi-key has them. Part # http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=493-1754-ND. Total cost was $7 with S/H.

Posted on Jun 25, 2009

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Look for and replace any 3300uf capacitors on the board. Even if they do not appear defective visualy, they are probably bad.

Posted on Jun 01, 2009

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