Question about Polaroid TBX-2000AF 20 in. TV/VCR/DVD Combo
The color comes and goes (yellow) without color
The remaining red retrace are the giveaway that this is most likely not a CRT problem.
(If there were no red lines, it could be the filament for the red gun of the CRT going on and off due to a bad connection inside the CRT - bad news.)
How is a black and white picture? (Turn down the color control).
If B/W picture is good, then the problem is somewhere back in the chroma decoder circuitry.
Check the video input to the CRT video driver board and signals on that board. If B/W picture is also bad, then you can compare red and green signals to determine where they are becoming different. The red lines in your description sounds like the red video output circuit is drifting and messing up the background level, blanking, screen, or other setting. Could be a capacitor or other component.
Hope this will help...
Posted on Jun 02, 2010
If this is erractic and occurs when the tube heats up you must check on the CRT base for any dry connections, open resistor to the gun drives. If soldering the base does not resolve the issue, then you have a possible serious tube damage, the guns are shorting. Check also for a dry solder on the Y/C processor and drive.
Posted on Jun 30, 2010
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Posted on Jan 02, 2017
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