Recent content by blturner

Well, this board was previously working before I washed and re-capped it. Afterwards, the issue was that it would boot, but only without RAM SIMMs installed which left it with only the 1MB onboard RAM. At first, I was suspicious of the RAM buffer chips, so I swapped those with another board. No...

Small update: I've been booting from a BlueSCSI V2 and I setup a new image with a minimal install of 7.1 to try out. There are no video artifacts afaict and Snooper has been running the 20 pattern RAM tests all afternoon with no errors. I'll have to try a full install of 7.1 and maybe a...

After failing to find any further broken traces, I decided to soak the board in IPA yesterday for about 8 hours. There was starting to be a fair amount of flux residue left over so I wanted to rule out that a dirty board was exacerbating things. I let it dry over night and booted it this morning...

I am dealing with a IIsi exactly like this and have gone through the exact same steps! 😭

Yeah, the cap goo on C7 made me extremely suspicious of all the 74ALS651's, especially after @Hugotronics comment. I swapped all of them with chips from a board that I know has working video and I haven't found any broken traces between those chips and the NUCHIP, RAM SIMMs, etc. It does seem...

Some progress made. In a bout of frustration I started following some traces in other parts of the board I haven't scoured over yet. When I got to the barcode, I noticed it was covering the traces near C19 and it had some suspicious looking discoloring right near the edge of the label. I lifted...

Congrats on your success @DevyDevly! I was working on my board last night, I ended up replacing every 74ALS651 with chips from a Mac II with working video and no change, so that doesn’t appear to be the root issue. I measured some of the replacement caps and noticed they were under voltage...

Hello fellow Seattleite! Coincidentally, I have a Desktop G3 300 I was thinking about just today. I found it on CL, the previous owner also picked it up from RE-PC. It came with 768MB of RAM, 6MB VRAM, DVD, and the AV IO card (which is the main reason I picked it up). I used it recently with a...

I replaced the SMD electrolytics with tantalum caps on this Macintosh II board 820-0228-A. The board boots, and sound is good, but the video appears with a scrambled pattern. I can see the cursor move between the broken up columns. I'm using a known good Macintosh Display Card with correct DIP...

i know what you mean, i recently found 4 LC475 boards that all chime when powered on but need VRAM and recapping!

It's got a different chip number, 5000112-00-01. I blew some compressed air on the slot connector and the pins tonight, there was a sneaky cobweb in there, tried it again but no change. I'll give the oxidizer a try when I have a chance to pick some up. As far as I can see from a visual...

I've also got a flaky IIsi PSU I was considering re-capping, but this looks like it might be a tempting alternative:

I’m attempting to setup a Farallon LC PDS card with an RJ-45 connector I had lying around in a Performa 637CD I recently obtained. I originally picked up the card for an LCII that’s in storage. The card installs fine, and powers on with a green LED, but so far I have not been able to get a...

Some good news to report: last night I sat down and began removing corrosion from the pads with an xacto knife. They cleaned up well enough to take some new solder and I was able to reattach the HC132 components that had fallen off. @KennyPowers was kind enough to mail me some extras from his...

How's a dishwasher compare to the ultrasonic cleaner? 🙃