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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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CTX PL7 Monitor
The monitor is a 17" CTX PL7. I believe it has a 1769-J21 Chassis.
I was using the monitor when it's brightness begun increasing in steps at 1 second intervals. After a few intervals, I shut the monitor off as the image was very bright. When I turned the monitor back on, the screen was very bright and out of focus, after 5 - 10 seconds the horizontal deflection failed leaving a single vertical line. Since I have been testing the monitor, the problem has become worse, now after 5 - 10 seconds, the high voltage shuts down. The voltages off the switching transformer are steady at 72, 35, -35, -47, -6.7 and -14.5 VDC. The voltage at the base of the HOT is steady 1VDC however at the collector of the HOT the voltage rises steadily from 20VDC to ~115VDC. When the voltage reaches 115V, the high voltage shuts down and the collector voltage immediately drops to ~85 volts and continues to drop. While the collector voltage is increasing, a few bright, focused, slightly diagonal, horizontal lines appear in the lower section of the screen. I traced the path from the collector of the Hot to the flyback, then ohmed out the pins until I found a set that measured .6 ohms. The voltage at this pin measured a steady 72 volts. Unfortuently, I do not have a scope to check any signals. Thanks, Nate -- http://www.Weber-Automation.net:8000 |
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