68kMLA Classic Interface
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| Two SEs & Accessories - $300 | |
| Posted by: Phipli on 2023-05-06 08:43:04 Could you take a closeup of the top of the BBU? The big square chip. It looks mangled? | |
Posted by: jdcurry on 2023-05-06 08:49:49Could you take a closeup of the top of the BBU? The big square chip. It looks mangled?  | |
Posted by: Phipli on 2023-05-06 08:51:46View attachment 56214Are the pins chewed up? The photo is out of focus, I can't quite tell. | |
Posted by: Berenod on 2023-05-06 09:20:43Are the pins chewed up? The photo is out of focus, I can't quite tell.Indeed, looks a bit weird, but hard to see on the photo... | |
| Posted by: joshc on 2023-05-06 09:37:22 Yeah those pins look damaged to me - like something was dropped on them maybe. | |
Posted by: jdcurry on 2023-05-06 09:44:15Are the pins chewed up? The photo is out of focus, I can't quite tell.Yes it appears something got damaged.  | |
Posted by: Berenod on 2023-05-06 09:53:55Yes it appears something got damaged.Guess you have found the reason why the LB won't work! How does the socket looks like? You might be able to get yourself a cheap battery leak damaged SE board where the BBU is not affected... | |
Posted by: jdcurry on 2023-05-06 09:55:17Guess you have found the reason why the LB won't work!The socket appears in good condition as far as I can tell | |
| Posted by: Phipli on 2023-05-06 10:22:56 Yikes. Why did they even have the BBU out! It's not exactly a user serviceable part. There is a chance that that level of damage has also bent pins in the socket. You might be able to bend the pins back, but it will take a lot of care and skill. Cheapest solution is probably a replacement working logic board. I'm not saying it isn't fixable, but if you need to buy a BBU and socjet, and then pay a professional to solder in a new socket, it will cost more than just getting a board. | |
Posted by: Berenod on 2023-05-06 10:39:36Yikes. Why did they even have the BBU out! It's not exactly a user serviceable part.Bob's turnin' around in his grave 🤣🤣 | |
| Posted by: jdcurry on 2023-05-06 12:00:15 Repair attempt #1 failed. But I must say I think it looks a little nicer (not that it means anything if it doesn't work). Been using a plastic spudger tool with a pointy end to carefully move the pins around.   | |
Posted by: Phipli on 2023-05-06 12:05:08Repair attempt #1 failed. But I must say I think it looks a little nicer (not that it means anything if it doesn't work). Been using a plastic spudger tool with a pointy end to carefully move the pins around.Did pretty well. It's likely that the previous mangled insertion bent the pins in the socket back, so worth checking to make sure the contacts are... in contact. Put a straight edge down the pins and check for ones that don't stick out enough. Check the socket, are any contacts crushed? Can they be adjusted with a careful poke? | |
| Posted by: Phipli on 2023-05-06 12:08:49 Note even if you get it right, it is possible that the BBU being mangled like that has toasted it, or something else on the board. Just to warn you. What RAM do you have in it at the moment? If you haven't cut the resistor you need the 256k SIMMs. | |
| Posted by: Berenod on 2023-05-06 12:09:00 Sure looks a whole lot better, but I just worry the BBU itself might be toast due to the pins being shorted out or being in the wrong place before... ---edit--- Phipli beat me by a nanosecond 🤣 | |
Posted by: jdcurry on 2023-05-06 12:30:33Note even if you get it right, it is possible that the BBU being mangled like that has toasted it, or something else on the board. Just to warn you.Yes, it has four sticks of 256k. I have included four close-up images of the BBU socket (rotating the board as I go). I don't have a magnifying tool to assist me but it looks to be okay. Maybe. Please let me know if you see anything out of place...     | |
Posted by: jdcurry on 2023-05-06 12:38:27Sure looks a whole lot better, but I just worry the BBU itself might be toast due to the pins being shorted out or being in the wrong place before...I am sorry for my ignorance but I don't know what the BBU function is .... at first glance it appears that could you could insert it incorrectly though. | |
Posted by: Phipli on 2023-05-06 12:44:51I am sorry for my ignorance but I don't know what the BBU function is .... at first glance it appears that could you could insert it incorrectly though.The BBU is many things. It is a load of functionality that was spread through several chips in older macs done better in a single chip. It does address decoding, clock generation and other stuff. It is... a very bad thing to plug it in the wrong way. | |
| Posted by: Berenod on 2023-05-06 12:45:52 BBU, short for the Bob Bailey Unit, combines a whole lot of functions which were handled by individual chips (PLA's) in earlier Macs. One of the issues you had before with the display being garbled,, well, the BBU handles memory access for the video, so the sypmtoms make an bit more sense now seeing the state of your BBU! ---edit--- Feeling old, keep on getting beaten 🙂 @Phipli definitely types faster | |
Posted by: Phipli on 2023-05-06 12:49:53definitely types faster... on his phone 😛 @Berenod, here you go 🤣 : | |
Posted by: Berenod on 2023-05-06 12:54:45... on his phone 😛🤣 🤣 Ain't gonna learn how to type now...too old for that 😴 | |
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