Question about Mitsubishi VS-50607 50" Rear Projection Television

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Mitsubishi projection TV

My TV turns ON but no picture only volume. Before coming to this state the picture was concave sometimes turned completely red.

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  • Anonymous Jan 27, 2008

    SOUND NO PICTURE

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  • Master
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Try to re-solder the circuit board that contains the STK392-570 convergence modules. They're on the center circuit board attached to an aluminum heat sink that's about 8" long and 6" tall, about dead center in the circuit board. You may be able to recreate the problem (hour glass effect) by gently moving the heat sink (which the modules are connected to). This gives the hour glass effect on the picture and the advanced convergence screen. This is an indication that the modules pins aren't solidly connected (meaning soldered) properly. Remove the circuit board and clean the old solder off & resolder the modules pins to the circuit board reconnected the board and then retest by again pushing on the heat sink. This is a caused by a minimum effort (a.k.a. minimum cost) solder job, probably done in some 3rd world sweat shop. The "factory" job was good enough for 3-4 years but the heat (and these modules do create a lot of heat) and stress created from repeated use eventually takes it's toll, weakens the pin connections and our problem occurs. take the appropriate cautions working around the high voltage of the set & use a non-conduting piece of wood to push the heat sink when we doing tests. Best of luck, hope ya fix it. If that doesn't do it then the amps need replacing.

Posted on Jan 03, 2008

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Do the self test first to get the error codes

Posted on Jan 03, 2008

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1 Answer

Picture appears concave and shrunken and pulses in size


Replace Both of your STK convergence ICs STK392-570 If this is not number on your s use what it has on them. you can call MATs 1-800-628-1118 o Main STK is what is going bad when IC goes out all together TV will shut down and will not come on. So replace BOTH STKs ASAP! you will also need Heat sink compound to put on back of New ICs.

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Your reference to concave picture suggests a high voltage problem and not convergence. If the raster can't scan from left to right , top to bottom, your having High voltage trouble. if your colors are not dropping on top of each other that is convergence. I would suggest it may be time to consider a purchase of the new HD set for the cost of this repair. good luck

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Greetings joanne7,

The issue you are having could be caused by your television needing the convergence adjusted. During production your televison has the three picture tubes that are converged to form a single image on the screen. Over time these can come out of adjustment.
If you go to this link http://download.jazel.net/misc/filecache/b8/b89bca4c8b740315d378e8ed030461c5_1227-517SeriesOwnersGuide.pdf and check pages 57 and 58, it gives you a very detailed guide on adjusting your convergence. I am aware this model number is slightly different than yours, but I own a 47" Mitsubishi and this is the exact procedure we use to do our convergence so I am confident it is fairly universal.

I hope this helps!

Dorothy
Go Ahead. Use Us.

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No, but I do paid phone coaching for such things. Contact me directly and I'll steer you past the dangers and in all the right directions.


Mr Bob
www.imageperfection.com

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