Mitsubishi WS-55857 55" Rear Projection Television Logo

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Question about Mitsubishi WS-55857 55" Rear Projection Television

1 Answer

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

Posted by lonn_l on

  • Anonymous Aug 05, 2008

    Hey this seems to be the very exact problem that I am having with this same model tv. The only problem is that i didn't fully understand the solution to the problem that was presented. Thank you for your help

  • sushihs Sep 22, 2008

    I have the same problem, how do I locate the STK IC? Is the one with the big heatsink on the main mother board?



1 Answer


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

Posted on Nov 30, 2007


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I don't know what concave means

The curve of a lens is either convex or concave, that causes light to be focused depending on the direction of the curve.

So to answer your question, concave is just a bulging 'out' shape.


How do convex polygons differ from non-convex polygons?

A convex polygon is one with each of its interior angles less than 180 degrees and every line segment between any of its two vertices remains inside or on the boundary of the polygon.

150px-pentagon.svg.pngExample of a convex polygon (WIKIPEDIA)

A concave polygon will always possess an interior angle with a measure that is greater than 180 degrees.

150px-simple_polygon.svg.pngExample of a concave polygon (WIKIPEDIA)

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

Compaq 6410nx won't come on unless switch is removed and the pins are touched.

Is the aesthetics of the computer a factor?

May sound like an inane question, but there are those of us that can live with two wires hanging out to a switch.

This Actually IS the usual style, and shape of most Power On switches.

Once you take the Power On button mechanism, out of the Front Panel of your computer, you may see this type of switch, incorporated into it.

Advise use care, as Power On button mechanisms are made of plastic, and the power on switch is usually held in by tangs formed out of that plastic part.

The tangs have the tendency to snap off easily. Warm water usually helps when removing the old switch, by heating the plastic up. Dry accordingly, install the new switch.

Or, you may want to peruse a computer repair shop, and see if they have one available. Sometimes they tear down old computers, and save the switches.

This information stated, goes more towards the Mom and Pop type of computer repair shops, not the fancy, 'I want to sell you an expense computer, before you go out the door', shops.

The Power On button you push is just a plastic device, that pushes against one of these types of switches.

Pushes against that little 'N-ipple' that sticks out of the switch.

Just for edification, as not many techs bother to take a Power On switch apart;

Viewing the photo of the switch in the link I provided.

1) You'll see a square case. Metal square top for half of the case, plastic for the bottom half.

2) The n-ipple that sticks out, is a cylindrical shape that is molded to the middle of a flat square base.
It's made of plastic.

3) The metal top is square shaped, and has a hole in the middle. There are tangs that come down the sides of the metal top.
These tangs are bent over, and this is what holds the metal top, onto the plastic square bottom piece.

4) Inside under the movable part of the switch itself, (Number 2 above), is a square, flat, thin sheet of spring metal. (Very Thin)
It is convex shaped.

Pushing the n-ipple in of the switch, depresses the concave shape of the flat spring metal piece.
Makes it flat.

When it is flat, it contacts two terminal contacts at the bottom, of the plastic bottom piece.
The two terminal contacts, are attached to those two wires you see sticking out of the switch.

Letting go of the Power On button let's the flat spring metal piece pop back into it's convex shape.

All the things you never wanted to know, huh?

I am getting a high spot in the middle of the length of the wood that I am planing ie the middle is higher than the two ends, it bulges!

Always plane the concave side of the board rather than the convex side---its almost impossible to straighten a bulging side!

Green on screen

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


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?

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.

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.     


Screen Image is Concave

sony trinitron colour 29ins tv its black and white not colour but the teletext is colour
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