Watching TV and all of a sudden screen was all black except for a vertical rainbow color line down the center of the screen, then all black. I do have sound. Power light is not blinking.
Does this sound like a bulb issue?..or???
Thank you for any assistance!
Hello twisttolife,
What you have lost is horizontal deflection, this is caused by loss of the horizontal drive signal to the yoke transformers on the CRTs, for all three of these to fail at the same time is not likely so what I think is that the drive amplifier may have malfunctioned. To check this you will need:
1) schematic diagram or service manual (to determine the proper voltages and signals on the deflection board)
2) Multimeter (to measure the DC voltages on the components of the deflection board
3) Oscilloscope (to view the waveforms on the deflection board)
With these three pieces of test equipment you should be able to troubleshoot this problem.
Now if you do not have this equipment and what to take a chance at a blind guess, and just replace a board, I would suggest replacing the deflection board, this board usually contains the flyback transformer, the Convergence modules (which can cause this problem also), and the connections to the yoke transformers.
I hope this helps,
Shuttle83
http://www.electron-age-technologies-llc.com
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