Helloz everyone! I have a TeleVideo TS-1605 that powers on but nothing shows up on the monitor. I have some familiarity with vintage pcs… obviously not enough. Anyone know of any TeleVideo TS-1605 repair references? Im having trouble finding anything on this.
Tech ref manual can be found here.
https://vt100.net/manx/details/6,21245
Monitor schematic on pdf page 58. Here’s a screen clip of the video input connector. Looks like the pinout is as follows:
3 = ground/common
4 = video in
1 = horizontal sync
5 = vertical sync
First thing to check is if sync and video are good at the monitor input, to determine if the problem is the monitor or processor board video. If the video+syncs are good, check the voltages on the regulators of IC101, IC102, IC103, and Q102/Q103.
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