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| 128k vs Rust | |
Posted by: Pushpull76 on 2022-08-24 02:58:53What’s the significance of this? 🤔It's presumably the production week of the motherboard (23rd week of 1984). Mentioned @LaPorta because I was searching one in the last months marked 8422. | |
| Posted by: LaPorta on 2022-08-24 04:27:53 He was mentioning this because I currently have four 128k boards I am going to try and rehab that are in far better cosmetic shape than this. Yes, indeed, I can be persuaded to supply one for this if that is the route you’d want to pursue. | |
| Posted by: Durosity on 2022-08-24 06:23:31 I appreciate the offer. We’ll see where it goes. At present I’d describe my board repair skills as experienced beginner (despite many decades fiddling with stuff and working as an apple tech 20 years ago, but then that was just part swaps). My main concern at present is making it worse, but I’m pretty certain with some help we’ll be able to make some progress on it! First thing I need though is to get it cleaned up so I’ll need to get a good ultrasonic cleaner first.. and I’ll need permission from SWMBO for that.. | |
Posted by: Phipli on 2022-08-24 06:33:00I appreciate the offer. We’ll see where it goes. At present I’d describe my board repair skills as experienced beginner (despite many decades fiddling with stuff and working as an apple tech 20 years ago, but then that was just part swaps). My main concern at present is making it worse, but I’m pretty certain with some help we’ll be able to make some progress on it!This is what I've been using in mine. Not sure if there is anything better out there as I haven't used anything else yet. Seems to work well enough. Cleans things and gets rid of flux. Ultrasonic PCB Cleaner and Flux Remover 5 LTR Fluid, for use in ultrasonic Cleaning Tanks and Baths, removes Debris, Dirt and Grease, 5 Litre : Amazon.co.uk: DIY & ToolsUltrasonic PCB Cleaner and Flux Remover 5 LTR Fluid, for use in ultrasonic Cleaning Tanks and Baths, removes Debris, Dirt and Grease, 5 Litre : Amazon.co.uk: DIY & Tools
amzn.eu
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| Posted by: LaPorta on 2022-08-24 07:57:34 I need to get one of those cleaners. Anyone recommend a certain size? Even for some larger, tower style boards? | |
Posted by: Phipli on 2022-08-24 08:03:11I need to get one of those cleaners. Anyone recommend a certain size? Even for some larger, tower style boards?22 litre minimum for things like a IIx board. Even then you have to do it half at a time. | |
| Posted by: Durosity on 2022-08-24 09:33:59 I was wondering how viable it was to do half a board at a time.. I was worried it may cause some damage to the components that were resting on the edge of the tray. This is kinda why I was thinking of building my own, much like Bruce at Branchus has done. Something wide and long but not terribly deep. | |
Posted by: Phipli on 2022-08-24 09:38:34I was wondering how viable it was to do half a board at a time.. I was worried it may cause some damage to the components that were resting on the edge of the tray.I don't think it is an issue. The boards are touching the basket under the water anyway. | |
| Posted by: Durosity on 2022-08-24 13:16:29 Aye that’s true! Food for thought. | |
| Posted by: Durosity on 2022-09-19 13:29:02 So I’ve finally found some time to look at the 128k logic board after getting it cleaned up a bit. I’ve had to replace the caps as they were all leaking, but the pads for the positive connection have rotten through and won’t take any solder.. for the life of me though I can’t work out where it goes to to run a wire to.. anyone have any idea? | |
| Posted by: mgmac on 2022-09-19 13:59:23 my opinion, it's too compromised the motherboard, I had such a case many years ago with a Mac Quadra I would get a new PCB from a re-128 Mac, keep the good chips and solder myself a new motherboard to use for the next 30, 40 years 😉 | |
| Posted by: Durosity on 2022-09-19 14:42:32 Oh it probably is.. but I’m still gonna waste the time on it. I will eventually admit defeat.. one day! | |
| Posted by: Durosity on 2023-03-18 13:45:13 So I’ve borrowed a friends ultrasonic cleaner and I’ve managed to clean up the 128 board a fair bit! Now it does actually power up, but to black/white lines. It does the same with known working ROMs from another board, and indeed the same even if there’s no ROM on the board, so I suspect a r problem on the pathways before it gets that far… any thoughts on if that’s a fair assumption? (And yes, I know the board is most likely toast, but if anything it’s a good learning experience 😅) | |
Posted by: Durosity on 2023-03-18 13:46:34   | |
| Posted by: 3lectr1cPPC on 2023-03-18 13:57:42 I for one would love to see you get it working fully. Best of luck! | |
| Posted by: Durosity on 2023-03-18 14:16:58 So would I! I don’t think it’s likely.. but I wanna give it as much of a shot as I can. Alas at this juncture I’m not sure what the best next steps are. | |
| Posted by: 3lectr1cPPC on 2023-03-18 14:30:10 Dead Mac Scrolls, page 65: https://vintageapple.org/macbooks/pdf/The_Dead_Mac_Scrolls_1992.pdf Indeed it seems to be ROM related, so tone out those connections and see where that gets you. | |
| Posted by: cheesestraws on 2023-03-18 14:56:38 It looks to me like no code is running at all, or at least not enough to zero-init RAM: that's why the dead mac scrolls says it's ROM, but it could be almost anything in a board that's been in that condition. It might be oscilloscope time... | |
| Posted by: Durosity on 2023-03-18 15:01:01 Oooh thanks! I did actually have a look in the DMS but those pages are missing from my PDF! | |
Posted by: Durosity on 2023-03-18 15:03:15It might be oscilloscope time...Alas not something I have access to at present, but I am gonna follow back the traces on the rom to make sure they’re actually connected before doing anything else! | |
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