Question about JVC Televison & Video
You haven't mentioned nothing about the sound status of your TV. Assuming sound is there and its ok, I posts this solution.
If the lines are thin and scattered throughout the entire sceen at abou an inch apart or so, Blue Colour Output of your TV has damaged. This section, is integrated on the picture tube base card itself. It can be located at the neck of the picuture tube, pluged onot it with the help of a socket. You can pull it out from the picture tube neck. Be carefull when pulling it out. Never mak a shake upwards of sideways, as it may break the picture tube neck. Just pull it straight backward.
Just look for any dry or bad solderings at that board. I suggest you to resolder suspected soldering points, as loose solderings may be microscopic, and cannot be detected by our naked eye. Make sure not to make any solder bridges in between the adjecent soldering points.
Check the result. If it helps it is ok. If not, measure the voltages at the RED, BLUE and GREEN cathode of the respective picture tube pin points on the CRT base card you just pulled out. They must be almost equal to each other, provided a small difference of 3% or so, is allowable. In your TVs case, if blue output section is damaged, the voltage at that cathode will be very low with respect to the other two. Find out the reason. Normally, the transistor used there as blue output may be leaky. If so replace it. In some TVs, IC or ICs are used in this section. Whatever it may be, the blue output section in your TV is faulty and must be get repaired. I posts this solution, as I indicated earlier, assuming that the sound output is normal. OK.
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Posted on Dec 31, 2010
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Posted on Jan 02, 2017
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