Having problems with your Samsung SyncMaster 753 DFX 17" CRT Monitor ?
Crt monitor problem
\015 Hcl monitor red colour turns to black<< reason <
If it's intermittent it could be the red drive on the control board, but if it's constant it's probably the red gun failed. I would try the monitor on a diffrent system just to be sure but it's probably time for a new monitor.
Repair Help & Product Troubleshooting for Samsung SyncMaster 753 DFX 17" CRT Monitor
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