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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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Very old monitor repair
Hi everybody,
I got an very old monochrome monitor that is dead. It's an NEC BU-1201M(E)-1 from about 1985 It had an burnout fuse on the main board, replaced it but the screen remains black. Audio works. When I switch it on the first second the end of the CTR lights up but then it gets very dim or even no light at all. I can hear the HV make a little hunnimg noise. It's a monitor from a computer that controls a factory. The monitor was turned on in 1985 and never turned off, but when not in use the screen was cleared. The video input is NTSC Checked the power transistors (h/v) and they are ok. Transformer is ok. Anybody any tips? |
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