Recent content by SMMRepair

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.

Don't waste your time--eGPU is dead. You killed it when the LCD cable tore with power applied. I've had a dozen or so boards come in with damaged LCD cables (screwed-through, torn, etc) and it ALWAYS kills the eGPU. You need to replace the board. There is almost no margin of error for working on...

I just remembered something I saw recently, and just to be safe: Make sure you have the battery communication cable right-side-up. Had a customer with similar issues and it turned out he had his battery cable installed upside down...

Working on an 820-00165 2017 that I believe has a CPU fault causing no audio. Checked all the common issues for no audio, but found HDA_SDOUT shorted (.000) at J9500. Since this comes from the CPU, I suspect a CPU fault and nowhere else to go. Removed R1313 and found HDA_SDOUT_R shorted to...

I tested it in several assemblies as noted in the original post. It's a board fault, not a camera/assembly fault. With those resistors removed from the board, camera works in all 3 test assemblies of ours. With resistors in place, camera works on none of them. That's why I was suspecting the...

No ideas I guess? Will just consider this one fixed with the ALS SMBUS resistors removed. Not ideal having keyboard backlight on full-time and no auto-dim of LCD, but it will work I guess. Thanks.

@piernov any ideas on this one? Could SMC fault in such a way that it would only affect ALS SMBUS and not anything else connected to that line?