Question about Toshiba 55H70 55" Rear Projection Television

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Toshiba 55H70 Green CRT

Hi, My green CRT went out. Local Toshiba authorized repair place said I should replace it. I did. No the color balance and brightness is way off. They've been out adjust it, but said they need to come back with the service manual and some test equip. Meanwhile I start doing some research and find that most everyone suggests not to replace one of the CRTs because it will never balance right. One person said there is separate driver electronics for each tube, and a good tech should be able to adjust down the new green or adjust up the red and blue tubes. Any thoughts on this, while I wait for the tech to get a service manual mailed to his shop and come back out? Thanks, Don

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Re: Toshiba 55H70 Green CRT

Whgat you should have done was to take off the red tube socket and put that socket on the rear of the red tube onto the green tube. If the green worked then you know the green tube was good and the driver was bad. If a set is over 6 to 10 years old, and if you replace one tube, It will never get a good grey scale(B&W). I hope you didnt replace the tube when a driver was bad!

Posted on Sep 06, 2006

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My sony kp-51ws500 tv screen would turn green and stay on for about 30 sec, then trun off. I adjusted the green screen button on the black box in the front of the tv....via info from this site. It fix the...

Doing the adjustment is not actually a fix, all that does is change the drive amount of the green CRT which allows the set to work but the 3 CRts will be out of balance so picture color will be affected. The only way to repair a bad CRT is to replace the CRT itself. You can get replacement Green CRT from

Jul 30, 2011 | Sony KP-51WS500 51" Rear Projection...

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The color is messed up. the color is all different colors like red,green and blue.

Your convergence is out of whack.

This can be caused by a failed convergence IC - or can be adjusted using the Convergence settings in the main menu.

May 15, 2011 | Toshiba 55H70 55" Rear Projection...

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Lost the green tube where do I find one? The color is either red or blue on my set.

Need the model number of the tv. Are you sure it is the tube itself? The fluid in the CRT may have turned cloudy and need replacing. Check to see if the bulb is glowing in the CRT neck. Can you see any light coming out of the bulb?

If you need to replace the CRT, it is always recommended to replace all three in order to keep the colors balanced. Look on Ebay for a used CRT. You need to get the part numbers off of the CRT assembly, usually located up near the face of the CRT itself.

Jan 30, 2011 | Toshiba Projection Televisions

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Projection is messing up. Too much red and blue color.

A CRT projector requires Convergence and Color balance adjustments from time to time. These settings can drift. What you are seeing is a lack of Green color intensity. Do you see some pink in the 'whites'?
The Green CRT surface also burns off faster than the Red and Blue leaving behind the same appearance. As long as your Green CRT is not too burned by gaming or watching Golf and football, a local tv tech will be able to dial it in for you.

Jan 07, 2010 | RCA HD52W56 52" Rear Projection HDTV

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If the red isnt responding via the remote you will need to replace the STK392-110 Ics as the service menu adjustment will not correct it 100% due to the IC being faulty and the red and half the green is controlled by one IC and the blue and other half of green is controlled by the second IC so without changing both ICs the set will progressively get worse. Both ICs are stk392-110. You can get replacements at the following link along with instalation instructions

Jul 13, 2008 | Toshiba 55H70 55" Rear Projection...

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Toshiba 55h70

sounds like the convergence ICs are defective and need to be replaced, they are STK392-110 you can get replacement ICs at the following link that include free instalation instructions.

Jun 06, 2008 | Toshiba 55H70 55" Rear Projection...

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Toshiba 55H81 Blue and Red Only

so you missing the green is is either a bad connection on the green crt or convergence amp ic bad
do this first
then if that doesnt fix it

Jan 23, 2008 | Toshiba 55H70 55" Rear Projection...

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Bad picture

Try to consider the following tips:

Smearing out of one or several colors, best seen in txt-mode, my 27CE4599/30R smeared out in red and green, not in blue, fully exchanging the drivers (input and output complete, otherwise the RGB driver will blank the crt) moved the fault to the other color
Replace the 180K feedback resistors in the amplifiers with normal 1/4W metal film instead of 1/8W, they can become open circuited (in mine both green and red were faulty in this way). Change all 3 and not just the defective ones, replace also all the paralleled 75K resistors per color (fe by 47K+27K) to prevent bright color raster (they can also become open circuit)

Nov 29, 2007 | Toshiba 55H70 55" Rear Projection...

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Adjusting the color convergence

You are going to have to have the convergence IC's replaced, the only way to correct this I'm afraid. Good Luck

Jun 24, 2007 | Toshiba 55H70 55" Rear Projection...

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