Question about Toshiba 55H70 55" Rear Projection Television

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Red is offset

I have a 55" big screen about 8 years. Lately the red seems to be offset from the rest of the subject on the screen. This is an intermittent problem and the offset is not always offset in the same direction on the screen. It's a pretty nice set yet and I would like to fix it if possible. Thank you for your help.


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Re: Red is offset

Check out this link:

I offered some help to another person with the same problem and gave him a couple of good websites that will help.

I helped a friend with this problem. We fixed his set for about $25. The shop quote him $400.

Take a look and let me know if you need more help.

Posted on Dec 20, 2007

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Wavy green lines and offset during convergence calibration

There is whats called a convergence IC that is going bad inside this TV set. There is only one for all three tubes and the IC number is STK 393-11- and can be purchased here You will only need to order one. If you are handy and can solder this should correct your problem. One very important thing is, before you reinstall the new convergence IC, make sure you use a good coating of heat sink compound on the back of the new IC. If you do not, the IC will fail within a short time frames. Only if you are good with a soldering gun should you attempt the repair. If you are not, this repair should run you about 300 bucks or so. Also if you are handy, there are seven capacitors that go bad inside a board called the DM board. These will go bad very soon so while your in there these should be changed as well. If you need info on how to change these capacitors, let me know and leave an e-mail and I will send you the pictorial on how this is done. the IC change you will need to find that, but I do have a service manual if you need one also to help you along if you can follow the schematic. Good Luck

Nov 01, 2007 | Mitsubishi WS-55511 55" Rear Projection...

1 Answer

Red screen(rear projector tv)

Most likely bad convergence amplifiers. They are soldered in components.They can become intimentent and the lines come and go, usually red or blue.

May 14, 2009 | Projection Televisions

1 Answer

Samsung HCM5525W 55inch

This is a convergence problem. It happens to all big screen rear projectors. The convergence output ic's need to be replaced. I would let a repair man do this.

Nov 11, 2008 | Samsung HCM5525W 55" Rear Projection...

1 Answer

Phillips 55' tv big screen

You should check and see if the red tube is showing any light. The green and blue make yellow when the red tube stops working. If it is showing red but looks dull, you will need to change out the fluid inside the tubes, as it is corroded. I will post a fluid change procedure on the repair tip for this set. I cannot post it here as they will not let me. They say it is too long. Go figure. They do not let you post what you want I guess.. Good luck with your repair.

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1 Answer

PCN5425R Fading in and out

No It is not the picture tube.
First, I would suspect a bad solder connection (cold solder connection) to find this problem hit the side cassing to see if the picuture goes away or comes back.
Another way is take the back cover off and tap gently on the boards with something not conductive or your hair would look like mine. The most commond section is power supply and neer the Horizontal flyback transformor.
The horizontal transformor look at it, it's a big greyish darty little thing about 3" x 4" and stand up about 4" with a big red wire going out of it. Don't touch it, it has very high voltages, just look what it done to my hair I'm telling you don't touch it along with it's red lead's. Just look to see if it is arking if so replace it.

When you have convegence problem , it is mis aligment of the colours in the genmentry aligments.
I would suspect more in the power supply section.


What about Bob
Timmins, Ontario
Home of Shania Twain.

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1 Answer

Problem with red on one side

all you have to get to the convergence area to adjust that quadrant thats bad

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1 Answer

Blurry Image problem with Mitsubishi WS-55805

Hello, if you want I can supply you with the service manual, please leave your email. Best regards, Arpi

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1 Answer

Screen now has 3 small boxes in middle - one red, one green, one white

Its easy to fix and cheap. Check for chip kits.

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