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Still glitch free, maybe it was just a pin on the cpu not making good contact.  Diagnostics ran for two days in a loop, no errors in that time.

Well I am knocking on yellowed plastic here, but since reseating the CPU I have power cycled this poor GS about 50 times and haven't once had the glitches.  Now with my luck the minute this post goes up it will glitch, but right now it is behaving.  Thanks for all the input and info on this...

Cruff,  I will run the GS diagnostics again, but I left them running overnight with no issues found.  Maybe when I notice the glitches I will try to run them then without the power cycle.   Gorgonops, Now you have me worried about the VGC.  Would the fact that it only happens in graphic modes...

Your right, there are two boards on this floppy.  Haven't taken any component out to test, but I looked at all the traces and can't see any that burned.  The smoke was very faint, but unmistakable.   I almost am leaning toward two wires in the main cable touching there to cause the smoke.  I...

Is there a somewhat finer approach to pinpointing what component I need to be looking at on the mainboard to fix this?  I will pull the CPU from the socket and reseat it, although I have pushed firmly on all socketed IC's but haven't pulled any.  Assuming that doesn't help, is there an IC I need...

I apologize in advance as I have been having more than a few issues with a newly acquired iigs. I have graphical glitches say in every 1 in 15 boots.  I have ran the IIGS diagnostics and it shows no errors.  I have a GGLABS 4MB card and an apple 1MB card and this anomaly will happen with either...

Very nice.  I may order a few just in case.  Several keys didn't always work 100 percent.

Hooked it back up in pieces reluctantly after finding nothing damaged that I can see, and amazingly it still works, as long as it is apart.  Going to carefully put it all back together and try one last time.  The metal braid around by the base of the 19 pin cable looks a little ragged, wonder if...

spoke too soon, the minute I reassembled the drive and tested it, same no boot antics.  Must have a loose wire somewhere.. on the 3rd boot attempt, let the magic smoke out of the drive, I can't tell where it happened exactly, but the smell is strongest by the back connector (from external data...

I have done everything I can think of with no results.  If I tap the front of the switch area when it is apart I get a close circuit, however when it is together I don't get a single sign that it is closing the path.  I tried shimming with cardstock, adding a drop of glue to the area that...

I took the 5.25 drive apart, didn't see anything obvious, I unplugged the bigger wire harnesses on the PCB and reattached and tested it while apart and it seems to boot fine now.  I don't know if I was dealing with a loose connection despite it looking fully attached, but preliminary results...

Forgive me I am not familiar with apple II troubleshooting at all.  I have a GS ROM1 that came with both a 3.5 and 5.25 drives.  When I connect both drives the 5.25 won't boot off of known good disks that work in my IIc, and it also makes the 3.5 drive get "stuck" where the drive access light...

I recently picked up a IIGS and the keyboard it came with had alps orange switches.  Well several of the keys didn't respond well (maybe about 6 keys) sprayed the switches out with deoxit and finally after several dozen pushes they started responding pretty consistantly.  However the "4" key...

Glad you got the drives working.  Only thing I can say in relation is my amiga 1200 had similar issues with the speed of rotation where it wouldn't read disks at all until replacing a small little capacitor that had gone out of value.  It luckily was a common fault and well documented on the...

Thanks cruff for looking into what the 12 volts is for.  Makes me feel a bit better about the low 12 volt output

Well the original 1987 cap with the blown top still measures @ 323uf on the Peak tester, the new cap comes in at 309uf.  I had ordered two different series of nichicons from Mouser and tested them all and I don't get a value higher than 311uf and infact one of the new 330 caps measured as low as...

Thanks for the reply.  I have tried to search this issue with low voltage and the only thing I have came up with is someone saying that that main filter cap could cause the voltage drop.  I know these new caps have a 20% tolerance, maybe the 330 isn't exactly 330 and closer to 300.  Just out of...

I picked up a IIGS advertised as working.  As with most 25+ year items I like to recap at least the power supplies.  I never turned the unit on myself before starting the recap due to the main filter cap having a puffy top.  I got everything recapped with the lowest ESR Nichicon caps I could...

Got the socket from Maceffects and it fit perfect.  Had trouble getting the old socket off and lost two traces on the front and one on the back, but it seems to be solid with 4MB now.  Apple diagnostics ran over 50 loops of long RAM test, so I am gonna say it was a success.  Thanks again for the...

Thanks Maceffects.  I will send you a PM for details.