Question about Mitsubishi WS-55908 55" Rear Projection Television

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Help with bowing

I own a ws-55908 mitsubishi hd tv and it bowes from the top and bottom of the screen. If I smack it, will go back to normal and then go back to bowing after a few minutes or it just will not do it all. Plase help me it drives me crazy

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Re: help with bowing

Usually consumer described bowing is bad solder connects

on pins of convergence IC's. If the effort is made to pull the center PC board out,then replace both Stk392-570 IC's for



Note: V-Pin amp and pin out relates to left/right side bowed-in

  issues,a problem not usually found on your model.

Posted on Oct 20, 2007

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Re: help with bowing

If the picture bows in from the top and bottom, the V-PIN amp has stopped working. If you smack the set and the bow goes away, it means that the V-PIN circuits are intermittent because of a cracked solder joint, most likely on one of the 2 output transistors. The set needs to be disassembled, the chassis pulled out and flipped over and the solder joints of all parts on heat sinks must be resoldered. If you have never done anything like that before, allow a qualified tech to handle it for you.

Posted on Aug 30, 2007

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It is a convergence problem, probably one of the convergence ICs has blown and must be replaced. Call the number in the last pages of your user manual to get repair service in your area.

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My tv jumps back and forth with a bow on the top and bottom

Replace both of your STK iCs STK392-570s they are big black iCs will have part number on them Call Mats Electronics 1-800-628-1118

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If this is a ws-65411: it sounds like one of the two STK-392-110 convergence IC's is bad; you need to have both replaced at the same time; I do this type of repair(done hundreds of them) and most can be done right in your home.

The two ic's can be purchased on Ebay for about 12 dollars plus shipping.

This is the slow time of year for TV repair shops--find someone in your area who knows how to do this kind of repair---here shops charge 3-4 hundred but I charge 200-250 total depending on brand of set.

Shop around and if they insist on "taking set to shop" keep looking---any good tech can do this repair in your home---MAKE SURE HE CHANGES BOTH of the IC's!

I do this here for free so if this has been helpful give me a vote here.

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1 Answer

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Check resistors might have cold solder joints are changed resistance values around replaced STK393-110
Pay attention to faded colored or fried resistors.
You can download service manual for WS-55511 from HERE to get schematics and technical info. (download all 3 parts of file and use WinRAR to extract file)
Good luck.

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Hello Pherpher85:

The convergence needs to be realigned it will need to go to a repair shop.

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You will find a very good guide here and here to fix your TV.
This might not be a DIY if you do not feel comfortable. The repair shops charge about $350.00 to $400.00 for this type of repair.

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