Question about Mitsubishi WS-55807 TV

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The red color stops working. If I tap the convergance board it sometimes pops back in.

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If ws55807 it is not bad connections on the middle board where the two STK-392-570 convergence chips are.

I have seen this over 100 times in these sets. What happens is the pins break loose inside the chips----I have had ones where I unsoldered the pins and some just fall out--only the solder trying to hold them in.

The good news is Total parts cost for the repair on EBAY (I use a seller there) will be about 15 for the two chips and should be under 30 total for everything needed.

I also have start to finish step, by step instructions for this repair in this model---tell you everything you will need and the best way to do it.

I will attach a photo of a typical convergence IC---yours are up front on the middle board facing the front of the set.

If this information told you something you did not know, rate this solution as very helpful as I do this here for free.

SD TECH



The red color stops working. If I tap the - 95782e7.jpg Yours will have the STK-392-570 NUMBER ON THE FRONT OF THEM.

Posted on Aug 30, 2010

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My Mitsu rear-projection WS-B55 was purchased in '03 or so. Now the screen is sometimes turning red. I can do a system reset, and the color goes back to normal. Then it eventually (maybe days later)...


No,pictures go all red?Pictures have colors shaded shadows or 3D pictures look alike?Yes,than the tv it is developing a problem known as a convergence problems it dying.The tv convergence board have problems,must be resoldering those 2 or replaced 2 STK covergence ICS and some or all of it resistors too.To fixed the tv convergence board,to solved the convergence picture problems.The shop,will cost u like $300-350 for diagnose the problems and do all the resoldering work or replaces those parts on the tv convergence board.

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Your set uses the 195 series chassis, which has separate components for each of the 6 convergence channels and a separate power supply for the convergence circuits. If all 3 colors have drastically shifted, especially around the edges, then chances are your convergence power supply has stopped working. This is usually caused by the failure of the STK730-010 switching IC. If one of the colors has dramatically shifted by itself then something has stopped working on the convergence board. Sometimes I see CRT coolant leaking onto the convergence board as the cause. In either case this is something that should be repaired and realigned by someone experienced with RCA projection TV convergence circuits.

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It sounds like the common problem with this set. It is an intermittant picture tube, or there is a loose connection on the green drive board on the green picture tube. Try lightly tapping all around on the green drive board while the set is on and see if you have any change. BUT BE VERY CAREFUL! Lots of high voltage on the board. Also use a plastic or wooden device to do the tapping. If you do great, you know you need to resolder the connections on the board or clean the CRT socket on the green drive board. If there is no change, I would bet the green CRT is on its way out. But try tapping the green drive board all over as I said before, that is a very very common fault with these types of TV sets. Good Luck

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The tv 100% have convergence problems,it dead.Tv have colors lines R,G,B mis alignments,have colors shadows pictures or 3D pictures look alike?The tv have a dead convergence board,the 2 STK convergence ICS and some or all of it resistors are dead too.These parts on the tv convergence board,must be change to fix the tv convergence board to solved the tv picture convergence problems.The shop,will cost u like $300-350 for parts and labors.

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I have an 52 inch hdtv model number hd52w59 and my tv was workin fine and then it started to make this popping noise in the back and now sometimes my menu screen pops up the volume changes and it changes...


The tv have a problems known as a convergence problems,it dead.The tv have colors lines R,G,B mis alignment,have colors shadows pictures or 3D pictures look alike?The tv convergence board have dead 2 STK convergence ICS and some or all of it resistors too.These parts on the tv convergence board,must be replaced to solved the tv picture convergence problems.The shop,will cost u like $300-350 for parts and labors.

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Convergence Board (I hope)


check this out I have the same problem check your solder spot make sure the solder points are not touching one another, that could be one of the reason is doing this or just to make sure you can desolder the stk chips clean the holes where the pins go trough the board and power the tv with board and if the tv start fine if could be bad stk chips be very careful when desoldering or soldering good luck about another is not worth it they cost too much around 350-450

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1 Answer

HELP MY PICTURE IS RED AND SLIGHTLY BLURRY


It is probably a convergence problem which would involve solder work to change convergence i.c.s or if there are not colored shadows around everything it could be a problem with tubes. On a few of these I was able to remove the front grill and take off the small door, and with an insulated screwdriver gently tap on the neck of the tubes with the set on. Now if the picture flickers you have some particles on the filaments of the tubes and sometimes the debris will break free when you perform this, allowing your picture to restore full color and brightness without changing any parts whatsoever. Otherwise, the convergence chips are located on a large metal heatsink and have a generic part number printed on the front of each. Sometimes you have to remove a pressure clip to see it. Hope this helps, Russmann.

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1 Answer

Red & Green seem "off centered"


Your set uses the 195 series chassis, which has separate components for each of the 6 convergence channels and a separate power supply for the convergence circuits. If all 3 colors have drastically shifted, especially around the edges, then chances are your convergence power supply has stopped working. This is usually caused by the failure of the STK730-010 switching IC. If one of the colors has dramatically shifted by itself then something has stopped working on the convergence board. Sometimes I see CRT coolant leaking onto the convergence board as the cause. In either case this is something that should be repaired and realigned by someone experienced with RCA projection TV convergence circuits.

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