Question about Toshiba 55H70 55" Rear Projection Television

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Green Pillow after Conv ICs replaced

I had the problem described here and elsewhere about the STK392-110s failing. I replaced them and fixed the power problem, but there is still a problem. It's best seen in service grid mode, the red and blue grids look good, but the green is distorted like a pillow. The vertical lines are all straight. The horizontals are curved away from the center line which is straight.

Any suggestions. I don't have a service manual yet.

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Re: Green Pillow after Conv ICs replaced

The zip is on it's way. I'll check the resistors tonight and let you know.

Posted on Dec 11, 2007

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Re: Green Pillow after Conv ICs replaced

Did you check the resisters? also there is a reset that youcan do on the remote, go to this site:

Posted on Dec 05, 2007

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Red and green wavy lines 3d

Generally speaking a convergence problem will show up as a picture that appears like a 3D image with a bowing from the top and bottom. If this describes the problem, then try resoldering the pins on the convergence ICs. If that fails to resolve the problem, replace the ICs. These are large black ICs attached to a heatsink that should be marked STKxxx.

Keep me posted.


I am sorry about the late response. With the site changes, the questions aimed directly to me were no longer on the initial page and I was not aware of this.

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Can't control red convergence on VS-45607

The STKs are three channel ICs they each control horizontal and vertical of one color the third channel controls part of green and the other half of green is controled by the other ICs third channel. Its customary for the Ics to fail and only have one channel bad in the IC. However its recomended to change both because of the bad Ic having green it can actually weaken the other IC and that one will fail shortly.

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Hitachi 53UWX10BA convergence problems error code 4

Replace the conv ICs. Sometimes it's just the soldering involved, DK on Hit. But bottom line it's usually the conv ICs. They work very hard in there.

Mr Bob

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1 Answer

Blue conv. not adjustable

you will need to change both convergence ics they are STK392-110. You can get replacement ICs at the following link with free instalation instructions with pictures.

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1 Answer

Diagnosis 23

Protection cutting in can be caused by many different things, at least half a dozen.

Most of the time on a Mit, this is caused by the conv sys blowing a fuse that operates it, which is the same power supply that keeps the unit on. When that fuse blows, the voltage from the power supply that keeps the set on disappears.

The 5A fuses that keep the plus and minus 24v rails going are little green things that look like resistors, but are actually "IC protectors". They can be replaced by regular 5A fast blow fuses, GMA type (also known as F type - small, and hopefully pigtail, for soldering to the bad fuses. Parallell one or both of them onto the blown little green things after testing each with a VOM, which can be done easily in circuit while the unit is unplugged.

If either of those 5A fuses are blown, chances are you'll need to replace their conv ICs as well.

Mit's will work with their conv ICs disco'd - you'll have no conv correction, but the set will work and you'll see an uncorrected picture. At that point it's a shoe-in that the conv ICs are bad and need to be replaced.

Mr Bob

Jun 13, 2008 | Mitsubishi VS-50607 50" Rear Projection...

1 Answer

Conv problems with no pic has sound

Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

This is a very common failure on these projection sets and a fairly simple DIY fix. All projeciton sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.

Common Symptoms include....
  • 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.
  • TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some photos of convergence problems.



Here is a quick test....

Using your original remote go-to the settings menu then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move RED and BLUE in all directions - up, down, left, and right. And you should be able to get the grid straight.

If you can't move them in all directions or cant move them far enough your convergence chips are bad and should be replaced. This is a common problem.

Note: If you TV has as flash focus or magic focus button only try pressing the button. If it fails to fix the convergence your need to fix it. See below for a fix


You will need to replace the convergence chips and possibly some convergence resistors and pico fuses.
This is a a fairly easy DIY job if you are handy and can follow directions. You can get complete repair kits from or click here. They have put together DIY repair kits that include the OEM parts and step by step photo instructions for each repair. If you are not handy or can't follow directions we would suggest calling a shop.

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