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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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On Wed, 02 Mar 2005 14:15:21 +0100, CIP wrote:
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? NTSC is standard North American TV video. What you have essentially is a monochrome TV being used as a monitor. You should be able to be able to cheaply buy a replacement TV type monitor. One place to check is video security monitors. A security camera being recorded on a VCR is using an NTSC signal. The video monitor for such a task would probably be a drop in replacement for your defective monitor. Note that even if you could repair this monitor, it will not be reliable at its age. A brand new monitor will give you the reliability needed for a factory environment. Aidan Grey |
#3
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In message , CIP
writes 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. The HV shouldn't hum, it should whistle, you can check for operation of the flyback transformer by holding a neon screwdriver close to the transformer, it should glow on a monochrome unit if it's running. 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? Replace it, if it's in a factory it's needed! You could probably replace it with a 12" PAL Unit and get away with it with a couple of minor tweaks to the frame rate and line sync. http://rswww.com supply chassis monitors as do many other 'industrial' electronics component suppliers. -- Clint Sharp |
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"Aidan Grey" wrote in message k.com... On Wed, 02 Mar 2005 14:15:21 +0100, CIP wrote: 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? NTSC is standard North American TV video. What you have essentially is a monochrome TV being used as a monitor. You should be able to be able to cheaply buy a replacement TV type monitor. One place to check is video security monitors. A security camera being recorded on a VCR is using an NTSC signal. The video monitor for such a task would probably be a drop in replacement for your defective monitor. Note that even if you could repair this monitor, it will not be reliable at its age. A brand new monitor will give you the reliability needed for a factory environment. Aidan Grey Don't forget that there might be special mounting considerations. Also I would not nessesarily expect a modern TV to last anywhere near as long as that monitor did, if the image was still reasonably good I'd repair it personally. |
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