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Could someone tell me where the blue marked pin of U25 goes on the 610 motherboard? This is the replacement F245 that previously worked. The pins marked in red seem to go to the SONIC. The blue pad may be loose under the chip now. Perhaps the trace was weak from the leaked cap and some heat made...

Well I guess I had to turn the dials to 11 on this Quadra. I was playing with NetBSD, and waiting for it to generate SSH host keys while doing other things. I tapped the keyboard every now and then and it was still chugging away. It was doing this for quite a while. SSH might have been silly but...

I was trying OpenTransport, but neglected to uncheck the "Load only when needed" box to test pings. It seems to be working now.

25 Mhz, with ethernet. The etherwave and my ASUS router show link lights, but MacTCP is quite unfriendly to setup so I don't have a network connection yet. But BlueSCSI seems just fine for now.

I redid all of the capacitors and the bodge wire, cleaned carefully, and re-seated the CPU. Now i'm booting System 7.5.3 via blue scsi. Thank you for your advice and encouragement!

I'm happy to say that the chip is replaced, and I'm now getting a startup chime! I'm messing with the VGA adapter to try to get a picture. So far it is either no signal or fuzzy gray. Thank you for your help, I really appreciate it.

I think my pin 1 is broken too. Do you know where it leads? It looks like it comes back up under U24.

Ebay seems pricey for two parts. I'm not very familiar with these parts- is this an equivalent? https://www.digikey.com/en/products/detail/texas-instruments/SN74F245DBR/373705

Thank you for the assistance. I'll need to order a couple of things, including the replacement part, so it will be a bit of time before I can report back.

I should start by saying that I do not have plans to trash anything- the case and other parts are quite nice actually. I do not have any other boards to salvage from just yet. I was able to remove the bad part by overflowing with solder, but it looks like there was other damage to the board...

Two legs ended up falling off. The pads on the board are damaged too, from the looks of things the trace and thru-hole as well. Seems like this might not be easily repairable. I'm also not sure where to get a replacement F245.

I think I found the issue: U25, a F245 bus transceiver. This was next to a leaky cap. I thought I had it clean enough, but when I went over the area again one of the legs fell off :/ Based on the block diagram of the 610 this would probably cause issues reading the ROM at startup.

I forgot to add: the board was believed to be working before I got it. At least one cap was missing when I got it so I never tried to power it on before doing the recap. 8 of the remaining 9 fell of with a gentle tap. Only one had to be desoldered.

The PSU has solid 5v and 12v. The neg is -12.25. G1 measures a consistent 2.2V on that pin which seems middle-ish? I bought this adapter: https://www.amazon.com/gp/product/B0016OC1J2/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1 I would expect some signal to at least say "out of range" on...

I double checked C53, and it seems to be OK. I also checked the VLSI chip next to the CPU. I didn't notice any shorts or corrosion when looking at it under my "toy" USB microscope. I cleaned everything with 99% IPA, let dry and also used air to blow out anything under chips. I did not soak the...

The battery is new and has the correct voltage. I've also tried with and without VRAM. It should have onboard VRAM and RAM. Here is the top of the motherboard. I can take a closer picture of an area if needed. Thank you!

I have a Quadra 610 I'm trying to restore. Many of the original capacitors fell off, so I've replaced all 10 of them. There was some minor surface goo around two of the capacitors. Around C50 - the 74F245 - had some crud on it but it came clean. The legs are intact and seem to be OK now. With...