| Electronics > Repair |
| Repairing a video monitor in an IBM 3279 terminal |
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| jmaynard:
I'm trying to bring an IBM 3279 color CRT terminal back to life. Following their diagnostic procedures, I've isolated the problem to the video monitor, a unit they purchased from an OEM. There's only one logo on the monitor, and the only part numbers are IBM's, so I'm flying blind without a schematic. The power supply voltages are all good, and the rest of the electronics report good as well. The logo is the triangular symbol in the picture. Where do I start? (Aside from not getting across the 28 kV anode supply, that is...) |
| wasedadoc:
Is the CRT heater glowing? |
| sanleontexas:
There is no doc available on these products unless you can find what was used in R&D or in service planning. In the field we used what what doc you apparently have. Having said that and that it's been over 30 years since I worked on this product line, look for a missing white plastic washer about 3/8" diameter on the underside of the display unit. I remember getting a call from another FE who had spent 2 or 3 days replacing FRU's multiple times when he called me for help. When I told him what to look for he called back a few minutes later to tell me of his relief and thanks. I had been there before. One of those problems that you always remember. That's the best I can do with my age and failing memory. |
| tunk:
I doubt IBM made the CRT and CRT electronics themselves. There could be a label on the CRT or PCB(s) that may identify who made it. And is this any help: https://terminals-wiki.org/wiki/index.php/IBM_3279 |
| tom66:
That logo is Matsushita, the predecessor / original name of the modern Panasonic. https://deskthority.net/wiki/Matsushita The monitor likely works on something like CGA signals, is there some way to hook up an external monitor to this kit to see if those are correct? |
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