Recent content by SMMRepair

Yes, pin 4 went high as-normal and I got signal at JT400 normally then as well, but the DFU failed *exactly* the same way. Diode reading is also NORMAL on IPD_SYS_AWAKE (.340) as compared to working board, so it's not shorted. Every other pin at JT400 is normal/present compared to a working...

IPD_SYS_AWAKE is 3.3v on a working board, and it's present at all times. On this board, it never appears or pulses or anything at all. :(

Thank you! Have tried DFU in multiple cases probably 50 times at this point. I have attached the exact error that happens every time. Also, I will mention: The error happens well-into the DFU restore; the Apple logo appears and progress bar at bottom of screen reaches ~80% done before the error...

Working on an A2991 board that had an overvoltage on 1v2_s2 which killed several components on that rail, including UG400, UG260, UG090, and UJ120. I restored power and the board seemed to work well; however, when I DFU restored it to install MacOS Tahoe, the board fails DFU with error 1 (no...

The T2 chip on the board must support the increased RAM. This is a big issue on the 00850 because of how many T2 model chips there are. If the board you pull the RAM from doesn't have the identical-model T2, it won't work, even if you configure the CFG resistors properly.

Bad info here--the lid angle sensor on the A2141 *DOES NOT* require any programming or pairing at all. Only the A2485/A2442/etc do. You can replace the A2141 lid sensor as much as you want without any other work.

Just added some Mac Minis! Hard to find boards here, and a little insider information: 50%+ of these are simple firmware/DEP locks, and may work just fine once unlocked (but are technically/officially "untested"). https://www.ebay.com/itm/133986125834

I run a very large logic board repair shop on the East coast. We repair a lot of boards, and in doing so, we buy a lot of boards/units from large vendors. Well, we're very "stock-rick" right now, and will never, ever have a chance to get to all the boards we have (thousands). These are all very...

Just curious if anyone has messed around with combing through BIOS dumps to find any info that might be related to the pairing of the TouchID Buttons. Alternatively, has anyone maybe tried swapping dumps/ME regions between boards to see if the other TouchID would work? Is the TouchID programming...

Have you tried a new USB-C port assembly?...Common for those to fail on this model, and will typically present in the way you're describing. Also make sure your trackpad/cable and battery are both good.

GPU probably toast.

The screens are not compatible...you need to use an A1707 screen with A1707 boards/units; only use A1990 screen with A1990 boards/units. Probably blew the camera filter near the LCD connector.

Check inside the camera connector to make sure no pins are pushed "up" and not making proper contact with the cable; have had a few instances of this. Also, did you buy U3900 reballed, or did you reball it? Where did you buy it? What diode readings do you get at the big coils near the chip?

No, totally incorrect. External display and internal display are handled totally separately. In fact, the eGPU on these boards USUALLY fail with external video working normally but no internal video. I have a stack of 20 boards I'll be happy to show you with the exact issue. Your board is toast.