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Gary119

Just purchased M5126 HELP

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Hello everyone, I apologize ahead of time if I posted this in the wrong forum. This is my first post. To make a long story short, I just bought my first Apple computer I’ve ever owned. It’s a Macintosh Portable M5126. I took it apart the other day to inspect the main board. I know the capacitors all need replacing, but I discovered other areas of concern. On the bottom side of the main board, I discovered deterioration to a substantial amount of traces. I’ve attached photos of the more prominent areas. My question is, could this be surface tarnish, or are these traces completely gone? Any help is GREATLY appreciated. I’ve got a history in cleaning and maintaining game systems, but I’ve never taken on a repair task like this before. Hope to hear from you all soon, thanks.

 

I want to bring this computer back to life.

 

Gary.

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Actually, Those are probably mostly okay. But mostly okay is like mostly peaceful, you're probably going to have at least problem trace. I suggest to go ahead and recap it and see if it works, it may in fact work. Who knows? Case in point, I had a SE/30 board I bought on ebay that wouldn't boot because one trace was open by the width of a human hair.

Edited by 360alaska

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8 hours ago, 360alaska said:

Actually, Those are probably mostly okay. But mostly okay is like mostly peaceful, you're probably going to have at least trace. I suggest to go ahead and recap it and see if it works, it may in fact work. Who knows? Case in point, I had a SE/30 board I bought on ebay that wouldn't boot because one trace was open by the width of a human hair.

Thanks so much for the response! I’m ordering all replacement electrolytic capacitors. What’s the best way to test continuity on the traces, to ensure which ones are not broken?

 

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Well, the schematics are available: https://drive.google.com/drive/folders/0B_Xp3uN-BcxsQjFLRUZqeEw2VFE?usp=sharing

 

But mostly if I suspect a bad trace I'll uncover both ends by gently scraping or sanding the surface to reveal the copper and then test continuity. But I'd suggest waiting for your caps and then checking it after. You'll also need working battery for it to boot.

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On 9/6/2020 at 12:27 PM, 360alaska said:

Well, the schematics are available: https://drive.google.com/drive/folders/0B_Xp3uN-BcxsQjFLRUZqeEw2VFE?usp=sharing

 

But mostly if I suspect a bad trace I'll uncover both ends by gently scraping or sanding the surface to reveal the copper and then test continuity. But I'd suggest waiting for your caps and then checking it after. You'll also need working battery for it to boot.

Got the through hole axial caps in the mail, the leads are too large and won’t fit through the holes on the board. I measured the original cap lead size, which was 0.65 mm. The ones I got in the mail are 0.80 mm. Does anyone know where to get ones that will fit? 

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