Hello, I have a problem with my tv witch only produces sound but no picture,,, It sometimes comes on displaying only one white horizontal line right in the middle and nothing else. Does anybody have any ideas or is this unit done. Thanks much.
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If you turn all of the color out of the TV, the picture should be black and white. If that picture is not a true black and white picture, the TV will produce a color picture that has that behind it. It takes the proper mixture of red, green and blue light to produce white. This is something that is done inside the glass picture tube.
In your case, one color (blue is stronger) and the others are weaker.
It probably had not been used for a while. SOMETIMES, the weaker colors will get stronger with use. Adjust the brightness and picture controls to get the closest you can to a black and white picture, and then add the amount of color that seems right to you. Use the TV and hope for the best. It will improve, but 2%, 10%, or 50%; I do not know. The proper repair is to replace the glass picture tube, which is not an option at this time. So, turn it on, play games, and HOPE for the best.
I have the same TV and what is happing is the TV has 2 recievers in it to allow the PIP, So you have a power pack gone on 1 reciever the other is working, Your set has 2 power packs,1 for each receiver.
I had both of mine go, 150$ a piece to have fixed, good luck.
This should be a quick fix. Try resoldering the vertical IC. This is a small flat IC attached to a heat sink with about 11 pins. It should be marked LA7837 or something similar. That should resolve the problem.
The most common problem (I have fixed lots) is the Vertical amplifier has developed a loose connection. It probably just needs resoldering. As things expand it makes and looses connection you picture goes in and out. The vertical chip is a large black chip that gets hot, over time it degrades the solder until a connection is damaged. Most newer sets have a protection circuit that senses the lack of height, and shuts down the picture tube to save it. When the picture dropped to a line on older TVs and left that way too long it would burn a line into the face of the picture tube. You then had to have the picture tube replaced along with the vertical amp. it's kinda like a screensaver for your TV.
Sounds like you've got whats called a cold solder connection somewhere in the horizontal width control circuit or a connection in the sweep section. Should'nt be two expensive but unless you have had some soldering and troubleshooting experience I would leave this on to the pros. Good Luck