I'm working on an 820-00426 board, and it's giving me tons of headaches, especially since there's no schematic for it yet. I'm doing my best with the 3787/00138 schematics, but it's tough.
The symptoms of this machine are that it restarts itself during boot with certain components in place. I'll put things in bullet format to make it easier to follow:
- Machine had liquid near U7501, and U7100. Replaced ~4 ugly caps and R7151/7152.
- Machine will start and boot fully 100% of the time without the WiFI card, SSD, or keyboard in place. Once either of those components is connected, it restarts during boot about 20 seconds after the Apple/loading bar appears.
- Thinking something was up with U7501 (since it had some liquid nearby, and that the WiFi card, SSD and keyboard all run off of 3v3 lines), I replaced it. Same result.
Not sure what else I can do to check things without a proper schematic and board view. They don't appear to be released yet, so I'm stuck here. Again, the board powers on and loads OSX fully (via USB) if the SSD, WiFi card and keyboard are all unplugged. If I plug in any of those 3 devices, it will cut out during boot. Should I try replacing Q7520/Q7560 (or rather, their equivalent on the 00426 board)?
Any ideas? All help appreciated.
The symptoms of this machine are that it restarts itself during boot with certain components in place. I'll put things in bullet format to make it easier to follow:
- Machine had liquid near U7501, and U7100. Replaced ~4 ugly caps and R7151/7152.
- Machine will start and boot fully 100% of the time without the WiFI card, SSD, or keyboard in place. Once either of those components is connected, it restarts during boot about 20 seconds after the Apple/loading bar appears.
- Thinking something was up with U7501 (since it had some liquid nearby, and that the WiFi card, SSD and keyboard all run off of 3v3 lines), I replaced it. Same result.
Not sure what else I can do to check things without a proper schematic and board view. They don't appear to be released yet, so I'm stuck here. Again, the board powers on and loads OSX fully (via USB) if the SSD, WiFi card and keyboard are all unplugged. If I plug in any of those 3 devices, it will cut out during boot. Should I try replacing Q7520/Q7560 (or rather, their equivalent on the 00426 board)?
Any ideas? All help appreciated.
Last edited: