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?
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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!
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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
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.
You have probably have installed the wrong lamp or you installed a third party/off brand Lamp. If that is the case anything other than a Factory replacement Lamp will have a different color temprature. Install a Lamp that is listed from the manufacture.
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/
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
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)