Pushpull76
Well-known member
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.What’s the significance of this?
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128k vs Rust
- Thread starter Durosity
- Start date
Durosity
Well-known member
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..
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..
Phipli
Well-known member
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 & Tools
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 & Tools
amzn.eu
Phipli
Well-known member
22 litre minimum for things like a IIx board. Even then you have to do it half at a time.
Durosity
Well-known member
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.
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.
Phipli
Well-known member
I don't think it is an issue. The boards are touching the basket under the water anyway.
Durosity
Well-known member
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?
Durosity
Well-known member
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
)
(And yes, I know the board is most likely toast, but if anything it’s a good learning experience
)
3lectr1cPPC
Well-known member
I for one would love to see you get it working fully. Best of luck!
3lectr1cPPC
Well-known member
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.
Indeed it seems to be ROM related, so tone out those connections and see where that gets you.
cheesestraws
Well-known member
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...
Durosity
Well-known member
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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