Yes indeed, it was a Maxell battery. I thought the carnage here was bad, but the pics in that thread look much worse!
Just a slight update... the HDD now intermittently works. It's still loud as an angle grinder, but the screeching/screaming sounds have quit. I guess the bearings have settled. Every time it boots when the HDD works, I get this error:
Is this a control panel setting to enable AppleTalk, or does the system automatically detect it? If the latter, I'm thinking this may be related to those missing resistors on the underside of the board.
However, it does boot into the Finder.
I have no ADB mouse, so I'm not able to do anything in it though since it seems early Mac OS doesn't support very many keyboard shortcuts. I accidentally put a bunch of extra folders on the desktop trying to find keyboard shortcuts. I believe it has System 7 installed on the HDD, but not completely certain as I can't get into the About window using the keyboard.
When the HDD does work and I do Command+Option+X+O to get into System 6 in ROM, now I get this error instead.
I've read this can be due to AppleTalk, so maybe this is also related to those missing resistors? Anyone know the resistor values for R88 and R89?
I do still get the ID = 02 error IF the HDD isn't detected and if the HDD is disconnected, so there's definitely something still not right. I've double-checked the traces and they seem to be okay, but one possibility is it looks like the Classic has a multi-layer board. Granted it seems a fairly simple multi-layer board, even shining bright light, I can't see that there are complex traces in the middle layer, but there is definitely at least a ground and also some voltage traces in that middle layer. It's possible one of those vias that I repaired needs to be grounded or tied high. Bad caps is also a possible culprit of the instability since bad caps make computers do weird things, although I haven't heard of these particular problems associates with bad caps.
Is there a motherboard schematic out there somewhere?
I doubt this motherboard would ever be stable, but it's fun to tinker!
Just a slight update... the HDD now intermittently works. It's still loud as an angle grinder, but the screeching/screaming sounds have quit. I guess the bearings have settled. Every time it boots when the HDD works, I get this error:
Is this a control panel setting to enable AppleTalk, or does the system automatically detect it? If the latter, I'm thinking this may be related to those missing resistors on the underside of the board.
However, it does boot into the Finder.
I have no ADB mouse, so I'm not able to do anything in it though since it seems early Mac OS doesn't support very many keyboard shortcuts. I accidentally put a bunch of extra folders on the desktop trying to find keyboard shortcuts. I believe it has System 7 installed on the HDD, but not completely certain as I can't get into the About window using the keyboard.
When the HDD does work and I do Command+Option+X+O to get into System 6 in ROM, now I get this error instead.
I've read this can be due to AppleTalk, so maybe this is also related to those missing resistors? Anyone know the resistor values for R88 and R89?
I do still get the ID = 02 error IF the HDD isn't detected and if the HDD is disconnected, so there's definitely something still not right. I've double-checked the traces and they seem to be okay, but one possibility is it looks like the Classic has a multi-layer board. Granted it seems a fairly simple multi-layer board, even shining bright light, I can't see that there are complex traces in the middle layer, but there is definitely at least a ground and also some voltage traces in that middle layer. It's possible one of those vias that I repaired needs to be grounded or tied high. Bad caps is also a possible culprit of the instability since bad caps make computers do weird things, although I haven't heard of these particular problems associates with bad caps.
Is there a motherboard schematic out there somewhere?
I doubt this motherboard would ever be stable, but it's fun to tinker!