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Color is off and can't adjust the blue convergence on my 55 inch philips rear projection

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If the blue component of the picture is bow-tie shaped, you probably have a fried convergence amplifier (CRT type sets only). They are inside two modules in the typical CRT type RPTV. Each one has three amplifiers inside, so you have two for each color. If the blue CRT shares an amplifier from each module, you will need to replace both. I recommend replacing both anyway because they are notorious for having a high failure rate and you won't have to guess which one has the blue amplifiers. Check the resistors connected to the middle pins of the amplifiers - sometimes they get burned out when the amplifier fails.

The part number on the convergence module is STK392-nnn, where nnn is a three digit number indicating the variant specifically used in your set. Some of the variants are rated for a higher current than others, and some have different pin arrangements. Make sure you get a name-brand such as Sanyo or Samsung; there are some unbranded Chinese copies out there with poor reliability. The typical price is $12-$25.

The modules are black plastic slabs about 3" wide by 1 3/4" high, with the bottom corners trimmed off at a 45 degree angle. A row of pins comes out of the bottom edge and go into the circuit board. They are mounted on some sort of metal plate or radiator to dissipate heat (heat sink). When you replace them, apply a very thin even coating of thermal transfer grease to the metal plate on the backside of the module, and clean off the old grease on the heat sink. You want only enough grease to ensure a "wet contact" between the parts; more than that will actually reduce heat transfer. While replacement is straightforward, it does require skill at reworking soldered connections on circuit boards.

The hardest part will be restoring convergence since you tried to adjust it. Be patient, and try to get the convergence points square to each other so the picture isn't distorted. Adjust each one a little bit at a time. There is some interaction between the adjustments, so what you do on one part of the picture affects other areas.

Posted on Mar 14, 2011

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http://tinyurl.com/lmp6eu
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