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A1706/EMC 3071—于2017年6月上市，这台13''MacBook Pro以可升级至3.5Ghz酷睿i7动态超频至4.0GHz的Kaby Lake处理器为特征。

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Board Repair Help with 820-00239 MacBook Pro

Hello!

I haven’t done much board repair and this is my first time diving into things in a few years so I thought I’d ask and see if I’m thinking right before I go switching things out.

Background: 820-00239 MacBook Pro, No power, ~4.97 V in on charger, 0.07 amps.

I started with checking PP3V3_G3H and I have 3.4v. While doing that I noticed a hole (more of an indent) smashed in the board by F7000. F7000 appears to be the only component effected physically. Both sides of the fuse read 0V. So somewhere between PP3V3_G3H entering U7000 and PPVBAT_G3H_CHGR_REG entering F7000 there is a break down. All the power rails into U7000 appear to be working (as far as I understand), and most read the same voltage as coming in from the charger. However PBUS coming out of U7000 reads 0 V, so U7000 is my culprit? I just want to make sure I’m thinking this through right and not missing some other crucial part seen by someone who works on these more than me. Thanks in advance!

Also attached below is the page of the schematic I’m referring, as well as the board (side opposite to F7000).820 0039 PBUS SUPPLY

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@mosesbuckwalter post a close up of the damaged area. Zooming in on the current image does not work very well.

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@oldturkey03 Sorry, meant to add this one. Will Post a picture of the other side later. Thanks

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The logic board is a multi-layer circuit board, which means that there are signal /power traces not just on the top and bottom but on multiple layers in-between, see this diagram to get a better idea of what I mean.

What this means is that the punch damage, while small, probably destroyed dozens of traces and probably also caused several internal shorts. This is because it's located smack in between two major sections of logic board.

This one is probably a goner, I wouldn't invest more time in trying to repair it unless you can get your hands on actual board layout data to see what the real internal damage is.

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Ouch! So while the fuse blew, it punched a sizable hole into the PCB!

It does look like the surface traces are damaged and likely the inners ones as well. You’ll need to check the inner traces so see if you can patch things up besides replacing the damaged components.

Is it possible this got some kind kinetic force from a projectile? This looks like to much damage from a blown fuse alone, what does the other side look like?

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I’m not home at the moment, but it most certainly was not caused by the fuse. I bought it in a lot of MacBooks on eBay, and it looks like someone smashed it with a T10 screwdriver… however bizarre that might be, but who knows.

I guess I’ll need to figure out where those traces go. How would I go about checking the inner traces?

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I’ve edited the original post to add a photo of the front side. Looks like a physical force hole. The board even has a slight bow to it at that point.

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@mosesbuckwalter - This might not be repairable. You’ll need to get the board view drawings to try to trace out the lines in the area.

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