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I recently acquired a PowerBook 180c and found it's trackball didn't produce any vertical arrow pointer movement, so I cleaned the ball, rollers, and the red-eye gizmos, but that didn't do any good. When I use my finger on each roller, the arrow pointer moves just fine horizontally and...

@David Cook To bring this thread to a final conclusion, I just wish to say that after removing the 3 resistors again in order to overclock back to 33MHz, and with my VRAM and 32MB RAM SIMMs installed, the motherboard booted up right away inside my Color Classic, and its currently running Norton...

With the 3 resistors still soldered to the board, I wanted to re-run TechStep again. All tests passed this time, including SCSI. When I pressed zero (0), it told me my spinner drive's make and model number. So all good on that front. Later testing will be done with the 3 resistors removed...

Oh no doubt some of those 575 body pins may have turned green. I pulled one of our office G4 Cubes from storage a week ago, and when I pushed in the handle and pulled out the core, I noticed that the soft metal mesh that goes around the top edge of the core and makes contact with the inner...

Funny, I never paid much attention to how people here in Japan referred to that particular iMac through the years. But I guess the reason I've never heard the Daifuku comparison is because there are just so many darned Windows users here! :-) That coupled with the fact I read English language...

@David Cook , you're a miracle worker. At least, I think you are. Last night, I cleaned the gold fingers with 100% IPA. Against the advice of my wife, I decided to go to work today, in part because I hate being absent, but also because my soldering equipment is at the office, and well...

You know, I hate it when someone creates a deceptive video with AI, trying to trick the viewer into thinking it's real. I've also seen a lot of "AI slop" that is thrown together too quickly and without needed edits by the human "creator". But I came across the following video the other day...

Had to take the day off due to the flu. This is the first time I've been in bed all day since I was a kid. Nasty stuff. I did make time a few minutes ago to use 100% IPA and a soft used toothbrush to clean the gold fingers of the LC520 board top and bottom and side. I gave it multiple...

@David Cook Thank you for your ongoing advice. I have DeOxit D5, but in my experience with using it on SE/30 connectors (Analog Board, etc.), I find that it cleans well, but then it leaves a somewhat oily film/residue behind deliberately so the contacts don't oxidize again. I think it's great...

ROM CHIPS I meticulously scraped both the outer and inner sides of every single pin on both ROM chips (which took a heck of a long time, let me tell you), inspected them under a lens to ensure no crud was flaking off them, then I properly install them in to their respective sockets. LC575...

Understood. Thanks. I suspect "unmodified body" is key here. I have the 84V Mod installed. As I speculated in my video, that is possibly playing a role. Another funny thing about using the stock CC motherboard with the 84V VGA Mod installed is that left/right borders are noticeably THICKER...

@David Cook I really appreciate the time you took to do that TechStep testing and provide a detailed report. Thank you! I’m getting ready for work now, so it all will have to be done after work tonight. Specifically: 1. Remove and scrape all legs of both ROM chips. Test and see what happens...

@Garrett Thank you for your advice. I actually had removed both ROM chips and re-socketed them at the time I recapped and overclocked (via resistor removal) the board even though the board was working fine. I did that restocking just to make sure everything would be OK. Even so I could go...

Last but not least, I tried my TechStep. I tried to enter TestMode but the TechStep responded saying ADB communications failed. Sadly, I had the same issue when I tested my fully working stock CC motherboard, as mentioned in my video here. Sadly, I simply cannot remember if I tried to test the...

I'm not testing the LC520 board inside my CC Mystic again. I removed the RAM and VRAM SIMMs, as well as the socketed FPU. I installed the PRAM battery after that and tested. Same as before. I flip the power switch, hear the CRT circuitry power up, then I press the Power Key on the keyboard...

@David Cook CUDA chip PIN-3 scope measurement (LC520 board with PRAM battery only)... CUDA chip PIN-4 scope measurement (LC520 board with PRAM battery only)... CUDA chip PIN-24 scope measurement (LC520 board with PRAM battery only, IIgs Keyboard Attached)... Keyboard Power Key NOT...

You've done a lot of board repair on your YT channel, so I really appreciate your kindness in making time to offer me feedback. If the CUDA is bad though, finding a replacement chip may prove difficult because it could only be sourced by removal from another logic board, correct?

I appreciate your excellent advice. My 520 board and scope are at the office so I’ll check tomorrow, but for now the CUDA appears to be the 28-pin IC shown top-left in the photo below.

I launched Mini vMac 26 (Mac II edition), booted into my S7.5.5 drive, installed After Dark 3.0b, installed the OJ module, restarted, clicked Demo, but found it still broken. But when I used the hot corner, it FINALLY worked for me! Wow. Lots of time and effort spent on this, but at least I...

I tried both the demo button and the trigger corner. Neither worked for me.