Hello,
Working with an 820-2936-B from a 2011 A1278 that we inherited after Best Buy could not fix. The computer has a broken screen but the LCD itself looks fine. It powers on and boot chimes but powers itself down, sometimes partway through boot, sometimes during an Internet recovery. It's the inconsistency that's confusing. I don't see any signs of water damage and was honestly hoping for a quick glass replacement and SMC/PRAM reset but those hopes are quickly fading.
The only apparent issue, aside from a prior repair attempt that probably used a Phillips bit to remove the Torx screws, is that the webcam cable was torn out of the board but the connector itself left in J3402. I extracted the connector from the jack and J3402 looks ok on the board. I have removed the customer-supplied RAM and put in a single stick of known-good. ASD EFI did not show any issues but I did not run the extended RAM tests because there was no change in behavior between our RAM and the pre-installed RAM. The computer shut down while trying to boot into ASD OS.
We tried disconnecting all of the cables aside from display and could not reproduce the power-off issue. Began reattaching cables and still could not reproduce the power-off issue, even with all of the cables connected again. So, we began an Internet recovery and everything was going fine but then partway through the install it shut down again.
Charger is an 85W Magsafe1 from Apple direct but we did also try a different charger, with the same result.
Booted from verbose mode a couple times when it was powering itself down with some regularity and twice it got to about the same point.
First time through it powered down right after:
rooting via boot-uuid from /chosen: C6C816DB-704F-389E-BFDB-F2CD80836F29
Waiting on <dict ID="8"><key>IOProviderClass</key><string ID="1">IOResources</string><key>IOResourceMatch</key><string ID="2">boot-uuid-media</string></dict>
Second time through it had the above message plus this:
Apple.AppleFSCompressionTypeZlib load start
Apple.AppleFSCompressionTypeZlib load succeeded
I'm not sure what is supposed to happen after that or what it might be trying to load. The only relevant hits that I could find with bits of those strings was around people trying to make a Hackintosh work, but not on an actual MacBook. When it powers itself off, the power button is then unresponsive and we need to pull the charger entirely for a few seconds.
It's most confusing.
Steve
Working with an 820-2936-B from a 2011 A1278 that we inherited after Best Buy could not fix. The computer has a broken screen but the LCD itself looks fine. It powers on and boot chimes but powers itself down, sometimes partway through boot, sometimes during an Internet recovery. It's the inconsistency that's confusing. I don't see any signs of water damage and was honestly hoping for a quick glass replacement and SMC/PRAM reset but those hopes are quickly fading.
The only apparent issue, aside from a prior repair attempt that probably used a Phillips bit to remove the Torx screws, is that the webcam cable was torn out of the board but the connector itself left in J3402. I extracted the connector from the jack and J3402 looks ok on the board. I have removed the customer-supplied RAM and put in a single stick of known-good. ASD EFI did not show any issues but I did not run the extended RAM tests because there was no change in behavior between our RAM and the pre-installed RAM. The computer shut down while trying to boot into ASD OS.
We tried disconnecting all of the cables aside from display and could not reproduce the power-off issue. Began reattaching cables and still could not reproduce the power-off issue, even with all of the cables connected again. So, we began an Internet recovery and everything was going fine but then partway through the install it shut down again.
Charger is an 85W Magsafe1 from Apple direct but we did also try a different charger, with the same result.
Booted from verbose mode a couple times when it was powering itself down with some regularity and twice it got to about the same point.
First time through it powered down right after:
rooting via boot-uuid from /chosen: C6C816DB-704F-389E-BFDB-F2CD80836F29
Waiting on <dict ID="8"><key>IOProviderClass</key><string ID="1">IOResources</string><key>IOResourceMatch</key><string ID="2">boot-uuid-media</string></dict>
Second time through it had the above message plus this:
Apple.AppleFSCompressionTypeZlib load start
Apple.AppleFSCompressionTypeZlib load succeeded
I'm not sure what is supposed to happen after that or what it might be trying to load. The only relevant hits that I could find with bits of those strings was around people trying to make a Hackintosh work, but not on an actual MacBook. When it powers itself off, the power button is then unresponsive and we need to pull the charger entirely for a few seconds.
It's most confusing.
Steve
