Have an SE, early two 800k floppy model, that I have been sorting out and it has been working for about a week. Today developed the checkerboard pattern on the screen so I resoldered the connections on the analog board that connects to the tube back connector. All good worked again for about ten minutes then rewbooted into checkerboard pattern, tried resoldering agin but no go. Had a spare analog board so changed it and it worked for a short time and then rebooted but now the screen is good but the mouse and the serial ports for appletalk no longer work. Tried a couple of mice and booting from another system but the pointer is stuck in top left hand corner and nothing works. Anyone come across this? thanks
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Macintosh SE Mouse pointer stuck
- Thread starter Fred1212
- Start date
How's the analog board cable that goes to the logic board? My SE did the same. Discovered that it'd work fine if I moved the cable around. Verified it was the cable by flipping it around. The area on the cable that I'd touch to make it work wound up being at the other end (same part of the cable itself) of the run.
While you're in there, check to see if there's any sign of damage on the wires of the harness. That's exactly how my SE acted when the cable was bumped the wrong way. It'd freeze up, then I'd try to reboot it, and be greeted by the checkerboard. Move the cable a little, and *BIPPP*, the machine would start up.
What does it do, exactly?
Have you reseated RAM and the ROM chips etc?
It's worth re-flowing the solder for the power connector socket on both the logic board and analog board sides, do the yoke connector as well while you're at it. They are prone to having weak solder joints.
What does it actually do? Stuck on grey screen, sad Mac, or what?
You can check the voltage of the ADB ports to see if you're getting 5V (http://www.interfacebus.com/ADB_Pinout.html)
If you're not getting 5V, check traces on the board. Might just be a broken trace.
If you are getting 5V, and your keyboard has a soft-power button, you can see if that button does anything while the machine is booted. The soft-power button can't boot the machine, of course, but IIRC it either starts a shutdown or prompts for one if you're already booted. I'm not sure if a certain system version or configuration is required to support that, though.
Or you can just ground pin 2; I believe that's just what the soft-power button does (but I'd want someone to back me up on that first)
Edit: Of course, you should check both these things on both ADB ports, so you can further determine where the failure lies.
If you're not getting 5V, check traces on the board. Might just be a broken trace.
If you are getting 5V, and your keyboard has a soft-power button, you can see if that button does anything while the machine is booted. The soft-power button can't boot the machine, of course, but IIRC it either starts a shutdown or prompts for one if you're already booted. I'm not sure if a certain system version or configuration is required to support that, though.
Or you can just ground pin 2; I believe that's just what the soft-power button does (but I'd want someone to back me up on that first)
Edit: Of course, you should check both these things on both ADB ports, so you can further determine where the failure lies.
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7.5.1 was the first system version when the power key was utilized for bringing up the shutdown dialog box.
Aha, didn't realize that was so late, but fortunately that should run on an SE (slowly) if you have a drive with that installed.
Yeah, it's a bit pokey on mine. Much prefer using 6.0.8 instead.
