I got a great deal on a lot of these 17" machines, so I've been going through fixing a lot of common issues, including C7771. This board had no green light due to a blown Q6910 (replaced Q6910 and U6915). Replaced both and got a green light and fan spin. Tested board and it cuts off halfway through booting. Checked C7771 and it gave the correct reading, but I replaced it anyway. Same issue persists. The board will stay on indefinitely if left at the EFI/boot select menu, but once I select OSX to boot, it shuts off about 15-20 seconds later (at about ~1/3 of the Apple loading bar filled).
I actually have two identical boards that are having this exact same issue, so I'm wondering if there are any common failures for this model that cause this issue? Replaced C7771 on both, and problem persists on both. No liquid to either board.
Any help appreciated! Thanks.
I actually have two identical boards that are having this exact same issue, so I'm wondering if there are any common failures for this model that cause this issue? Replaced C7771 on both, and problem persists on both. No liquid to either board.
Any help appreciated! Thanks.
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