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Working on an iMac for a change. No real prior experience (ripped the power button cable already) but as it's pretty much a MacBook on the inside, I should be able to work on this quite easily. 2 leds, no chime All rails present 5v rails are 5.1 - normal on these? or maybe just unloaded Some...

Got this one where it would get to 0,4A power draw and shut down after a bit. Restored firmware with DFU mode twice. Now it chimes but that's it: no image, no external video but responds to PRAM-reset. Pulls full power on 87W charger now. Not a lot of experience with these. Any pointers?

Works perfectly except for the screen. * Lines on screen when booted * No lines during boot * Doesn't boot with an A1708/2017 screen * No test screen available Behaviour does not change when moving the screen cables / moving the screen, so flexgate not likely(?). During boot: Booted:

This one came in with only 0V on one of the USB ports in one orientation. Changed the corresponding CD3215, first problem solved, it now has 20V and boots. Next problem, it now has a left fan that's on 100% all the time. Temps look ok (no reason for high fan temp wise). Ideas?

No visible damage, clean board. All cd3215's measure the same, no cycling on any of them. All 4 LDO voltages present for all, except BMC.

Got this one braindead; running fans, but nothing else. Reflashed BIOS with a clean one found on this forum (serial changed + checksum fixed) on a different chip and it came to life. Started a Big Sur install, crashed while loading the installer and now it's looping; fans spin for a while and it...

A customer sent this in with diodes D3300 and D3400 both shorting the PP20V line. I did the same repair 1,5 months ago on this machine. Suspecting a bad charger, any other things I should check?

* Crashes shortly after booting: black or garbled screen and no response * Everything seems fine till then * Logging looks normal * Removed a small bit of liquid damage between two of the unpopulated pads for U5450, looks clean otherwise.

No liquid damage, board in perfect condition. According to customer, this MacBook suddenly died on him. Measurements: PM_PWRBTN_L 3,3 PPBUS_G3H 12,6 PM_RSMRST_L 3,3 PPBUS_HS_CPU 12,6 PM_DSW_PWRGD 3,4 PPBUS_HS_GPU 12,6 RTC_RESET_L 3,1 PPBUS_HS_OTH5V 12,6 PCH_SRTCRST_L 3,1...

* Liquid damaged board (mostly SMC area) * None of the USB ports are working, 5V present. * No keyboard/trackpad (likely USB related) * Both USB hubs (4600/4650) seem fine visually. * Working fine otherwise (limited testing w/o USB though) It seems to me that the USB link between PCH and these...

All rails present, except for vcore and PP0V75_S0_DDRVTT (needs CPUIMVP_PGOOD). U7400 gets enable and power. ALL_SYS_PWRGD present PM_PCH_PWROK: present PM_PCH_SYS_PWROK: NOT present >> CPUIMVP_PGOOD NOT present History: * Milk damage * Mostly near SMC, but SMC was underfilled/glued...

I know these can have the CPU buck converter problem, but the error trace suggests the SSD (aftermarket with adapter, running flawlessly the past 2 years). panic(cpu 0 caller 0xffffff7f9d6c9231): nvme: "Fatal error occurred. CSTS=0xffffffff US[1]=0x0 US[0]=0x2e VID=0x1179 DID=0x115 . FW...

Any ideas how to attack this one? Seems to work ok, until it doesn't. Board looks clean. Considering a mem reflow.

Repair attempt 1: Recently fixed this one after minor water damage. Replaced the RIO because of crackling sound. Tested it, everything seemed to work. Repair attempt 2: Got it back because it wouldn't wake up on occasion. Measure around for a bit and found SMC_LID_RIGHT and LID_OPEN_RIGHT to...

Fixed up major liquid damage near CPU FETS and Wifi/BT area. All voltages present, but not booting, no USB activity. Changed EFI. Dead CPU?

This logic board keeps crashing, but only under load. Likely heat related? Any suggestions on this one, I'm not really familiar with this model.

Customer dropped this laptop and started having problems with the GPU ±3 months later. As a first attempt I've reflowed u9300, didn't help. Any suggestions on how to proceed?

This board works fully (in limp mode / 800MHz) when the battery is disconnected. When the battery is connected it chimes repeatedly, so at the end of the chime, it chimes again. A different battery produces the same result. Replaced ISL6259, didn't help. Any thoughts? Could this be GPU related?

Things tried so far: * Boot with wired connection * Boot with touchbar, touchID and screen disconnected * Full reinstall Will boot into safe mode. Had some corrosion on the touchbar side of the logic board.

- No liquid damage - Fixed short on PP3V3S5 FET. - PPVIN = 20v - Several short (?0.1 ohm) on U7800 (PMIC) rails ** PP1V8_S5G ** PPVCCPCH_S5G ** PP1V_S5G_REG Lifted coils for the last 2 and both have the short on the load side a.k.a. CPU/PCH. Of course, the CPU could be shorted. Would it also...