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Question about Mitsubishi VS-55601 55" Rear Projection Television

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Update and a few questions (Convergence Problems - VS-55601 55 in Projection)

Question (see below for more details): The big question I have is this: If the convergence chip went bad, why would the TV exhibit the convergence problem, then have it go away for a day, then come back again? I would think once it goes bad it would stay bad? The problem was immediate upon turn on, then I turned it off for 10 minutes, back on and everything was back to normal (and for several hours that night). Then the following day and ever since, the problem is back. Thinks I tried: I removed the convergence board (disconnecting all connections) and found the following: 1. No resistors were burned, no overheat marks, and all the pins on the SK convergence chips looked ok. 2. I saw that one resistor and 2 pins on the VGR connector had flux near them (assuming this means someone had replaced these in the past). By tracing the solder traces these seem to be related to the center convergence chip and trace to the VGR connetor (assuming this is for the green convergence). 3. I removed (solder) and resoldered all the main resistors and flowed clean solder on them. I also reflowed the solder to all pins on the center convergence chip. 4. I tested all large resistors and read consistant values for each (1.7 ohm, 4.5 ohm, and 0.555 kOhm) 5. On powerup, I jiggled all connectors to the convergence card and the corresponding connectors on the yoke of the green tube (carefully!). I also adjusted the screen and focus for the green tube (worked fine). None of the above changed the result. I still have convergence issues with the green tube and *only* in the vertical direction. I spoke with a local tech friend who said something about each chip has vertical and horizontal convergence sections and there are separate sections per color (he said 2 chips: 1 vert 1 horizontal, then 3 colors per chip, but doesn't work on Mitsubishi's). From what I can tell this is 3 chips (1 per color) and guessing each chip has vert and horizontal sections. Is the above correct? If so it would seem the chip could be bad for the vertical section. The big question I have is this: If the chip went bad, why would the TV exhibit the problem, then have it go away for a day, then come back again? I would think once it goes bad it would stay bad? I may order the chip and just replace it and see if anything changes, given I am dreading any manual convergence after replacement. Is there a good source for these chips? The chip is an STK-391-020. Thanks for all the help! :) Buzz

Posted by Anonymous on

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Anonymous

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Yes, they go bad interment because they have a large current go thru them and they generate heat, they are mounted on a heat sink with white silicone to help disapate heat. replace both not just one, try MCM Electronics get heat sink compound also

Posted on Oct 17, 2006

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Hello I have a mitsubishi vs-45603 with what appears to be a convergence problem.

You may have bought bad chips or your soldering...
This is a common problem on many brands of Projection Tv sets. Its usually a convergence issue. You can get more details and a solution here on fixya using this link http://www.fixya.com/support/r11932741-convergence_repair_dull_video_repair
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Projection TV sets are known to have two common problems. The first problem that is common to these sets is convergence failure. When this happens the TV will usually look 3D, Wavy/Distorted, etc. It may also shutdown and blink an error code.

The second common problem with Projection TV sets is dull video, halos around objects, white looking video, or red overpowers the screen. This is commonly caused by the fluid in the lens being clouded over.


You can find more details and solutions here on Fixya at the following link below. Or click HERE

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Yours may have one or more of the following symptoms...

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My Mitsubishi VS-50705 has an all over 3-D effect.

Yes it sounds to be convergence issue .

You have convergence problem in your tv . You need to replace convergence IC . YOu can get from the link below .

Convergence ICs

You need to replace both convergence ICs .It will cost you around $30 .
The IC number is STK392-110 .

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