68kMLA Classic Interface

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Macintosh m1296 recap good then issues.

Posted by: Jonweimer on 2024-10-19 08:37:05 I recently recalled this m1296 which has bad vertical collapse. On first run it looks fine as in the picture. I went into the monitors panel and hit identify monitor and it’s coming up built in monitor. Then I did a soft reboot. Now I’m getting this: So thinking I may have borked the resolution settings. I disconnected the hd and did a pram reset. Now it’s just solid lines and distortion. I checked all the voltages (don’t really think it matters) and they’re all there. Maybe a little high in the 24 and 100 but within 10%. I’m out of ideas.

Posted by: Jonweimer on 2024-10-19 08:42:04 Ps. I hooked it up to a vga monitor and it looks fine, so it’s not the cpu.

Posted by: Jonweimer on 2024-10-19 10:08:47 Ok I feel stupid. The vhold was a bit lose and with some rework it is back in shape.

Posted by: Jonweimer on 2024-10-28 11:30:49 Ok here’s an interesting one. I took the bezel off to retrobrite it. I put it back on. Now when I power the unit, you can hear the screen energize for about 5 seconds then there’s a click and the screen powers down. The board stays powered. Power is normal at the 24v tp, unit starts up with all the voltages correct then when the screen powers down the 80 goes to ~14, the 12 goes to ~1.4 and the 100 goes up to about 112. Is this a bad voltage regulator or something?

Posted by: Jonweimer on 2024-10-29 10:30:42 H hold was too high and triggering hv shutdown. All good now.

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