Question about Mitsubishi WS-55857 55" Rear Projection Television

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Convengence problem? I had the picture convengence into the middle. top part is concave down and the bottom part is convex up. Both side are OK.Once a while I power off the system for 5 minutes and power it back up. The picture go perfect for 5 second then back to convengence again

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Re: convengence problem?

The stk ic . the big amp chip has cold solder joints . resolder the ic

Posted on Nov 30, 2007

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I have a SP-47Q7HE Samsung rear projection TV that has 3 pictures that are not aligned. Top and bottom of screen distorted concave and convex?? Any advice appreciated

You need to replace your STK ICs they are big black ics will have part number on them you also need to CK 2 reisitors low ohms in same circuit 2.7ohms Mats has the ICs 9.95-14.95 each.
Encompass Parts Distribution you can order the whole board if they still have any in stock visit their website and type in your model number or call 1-800-638-3328

Jul 16, 2010 | Samsung HCM4215W 42" Rear Projection...

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My Sony Projection TV middle of the screen curves down on top and curves up on bottom. Picture looks dubble like 3D, screen looks like concaved. Left side of the screen color is light green and blue, right...

This is a very common failure on Projection sets. Its called a convergence problem.
You may have one or more of the following symptoms.
Screen looks 3D
Colors don't line up
One or more colors can't be adjusted when using the convergence menu.
Screen is bowed or warped.
No Audio / No Video - Makes Chirping Sounds
You can see some examples and find a fix here...

Sep 26, 2009 | Sony KP-51WS510 51" Rear Projection...

1 Answer

RCA R52WH74 52 in Blue & red in picture are shadowy Picture concave/convex

try goin to your menu and find settings ,,go to convergence,,if u got it ,,it may fix it,,it realines the colors,,good luck with that

Oct 06, 2008 | Projection Televisions

1 Answer

Green on screen

try to do it inside the board.
there are some adjustments except brightness and focusing..
try if you can ...


Aug 10, 2008 | Mitsubishi WS-65511 65" Rear Projection...

1 Answer

Sony KP-53XBR35 TV Concave top & Bottom in wide screen, along with color distortion around sides

thats usually a convergence IC failure, Are you able to move the red and blue colors in the convergence adjustment menu?

Jul 14, 2008 | Projection Televisions

2 Answers

Almost fixed!

see my last post to you regarding the converegence resistors

Jun 15, 2008 | Panasonic PT-53WX53 53" Rear Projection...

2 Answers

Picture has 3 images, all different colors (red-blue-green) screen looks concave in the middle top & bottom

This is what is known as convergence..(very common)... first question DO you have the "CONVERGENcE" option in your setup menu?.... if you dont there may be a special fuse issue... if not then more than likely it is what is known as convergence power supply issue. you have complete loss of convergence?

Jun 01, 2008 | RCA D52W19 52" Rear Projection Television

1 Answer

Convergence problem

The convergence ICs are located on the left board on a huge heatsink they should be STK392-110 or STK392-120. You can get replacement ICs at the following link and they also provide free step by step instructions on how to remove and install the new ICs.

Mar 29, 2008 | Philips 60PP9202 60" Rear Projection...

1 Answer

Hitachi 61SDX01B picture...

Sounds like the blue convergence circuit still not working.

Assuming both IC's are good, look for open soldered-in pico fuse.

Once bowing problem is solved,then convergence should adjust ok.     

Jul 27, 2007 | Hitachi 61SDX01B 61" Rear Projection...

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