SE/30 - chime of death, garbled screen, nothing helps so far

[Kurasiu]

Recently I managed to track down a nice looking SE/30, all cleaned up, with the board recapped by the seller, and with a new 30GB SCSI drive. The seller showed some photos of machine up and running, so I didn't expect it would end like this.

Unfortunately, when it was delivered, instead of a working SE/30, I was greeted by a chime of death and this pattern:

Tried to reseat the RAM and ROM, remove the battery and RAM altogether, even booting with bare minimum on board, and nothing works, the same pattern and chime of death still prevails. I glanced over Dead Mac Scrolls, but couldn't find that exact pattern. Currently, having no other idea (as I said before, the board was recapped with tantalum capacitors already, so I don't think that's the case), I just left it to soak in vinegar for 2 hours, as there might be some corrosion I haven't spotted. Anybody had a similar problem and have any idea what could I do next?

 

[aeberbach]

Soaking in vinegar? I would not do that, you want to neutralize any leaking alkaline electrolyte (capacitors, battery) but not allow the vinegar to eat away at any metals for hours. It is a weak acid but still an acid, will clean a penny in a short time or corrode and pit it given long enough. After a wash with gentle detergent and then alcohol, and enough time to dry, have you tried reseating every socketed chip? After shipping mine had 341-0635-A sitting up ready to pop out of its socket.

 

[Kurasiu]

Yeah, that's why I only left it in vinegar for about an hour, and then gave it a good wash and scrubbing. Left it for the majority of today to dry, but that did no harm or good - the Mac is still death chiming with the same pattern. The seller also suggested swapping the RAM around, but even with simm 1 and 2 populated with just 1 or 4 MBs of RAM (even tried sticks pulled out of my working 486DX machine), it still boots to the same pattern...

The only socketed chip is the video ROM, which I indeed resocketed, but it didn't do any difference too.