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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