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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  • Don Stafford Sep 06, 2006

    Thanks for the response. The green tube itself was arcing, I saw that myself while the green color was flashing on and off. Also, the tech did unplug a PCB from another tube and try it on the green tube, and it didn't light up. He told me the green tube shorted itself out, I believed him. The TV is 5 years old. I'm hoping he can adjust it, but I'm doubtful. I don't know what my next step will be if it's not adjustable enough to make a good picture. I guess I could ask them to take out the new green tube and replace it with a used tube, or I could have them replace the other two tubes. I asked him to bring a color bar generator because it's hard to tell just by a broadcasted picture if the color is right. If anyone has any ideals, I'd love to hear it. Thanks, Don

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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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Posted on Jan 02, 2017

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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 www.tvrepairworld.com

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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.

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you have defective RGB Circuit The Red, Green, Blue, You have shorted Green Circuit in Crt circuit this needs to diagnose to locate the shorted parts...

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1 Answer

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.
http://servicemanuals.vstore.ca/

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1 Answer

Color sudden change


Good day.
Your unit is still worth. It may be a caused of loose contacts along the circuitry. It can be remedied by resoldering the terminals particularly the chroma section and the crt circuit.


chris

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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
http://www.riddledtv.com/repair/journal/Toshiba51H84/index.html
then if that doesnt fix it
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

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1 Answer

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)

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1 Answer

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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