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Hi, I’m working on an A2681 logic board (820-02536) that originally had a 512GB dual-NAND setup. Unfortunately, both original NANDs (UN000 and UN100) are faulty. For testing purposes, I want to convert this board to a single 256GB configuration using a KIC5224 NAND pulled from a donor A2681. I...

Hi, I have a MacBook Air M2 (13” / 820-02536 / A2681) that is stuck at 5V. It had water damage in the following areas: F5200 was blown and has been replaced. R8450 (pin 1 / PPBUS_AON): the pad was missing. After restoring the pad, PPBUS_AON could not be measured there for some reason, so I...

Hi, I have upgraded the RAM on a test machine from 8GB to 16GB (SKhynix 9CCNNNBJTAL). What is the correct MLB_RAMCFG strap setting for this configuration? Proposed 16GB Config: MLB_RAMCFG0 = Low (1k ohm resistor to ground) MLB_RAMCFG1 = Low (1k ohm resistor to ground) MLB_RAMCFG2 = High...

Model: A2681 Board: 820-02536 Symptom (with charger only and battery/charger): The device continuously power loops between 5V and 20V (5V → 20V/0.01-0.12A → back to 5V → 20V/0.01-0.12A …). Measurements: PPBUS_AON: 12.26V → 11.97V → 6.6V → 12.26V ... not stable PP5V_AON: 5V stable PP3V8_AON...

Hi, I have an 820-03286 (A2941 / MacBook Air M2 15” 2023) that has no PPBUS_AON and gets stuck at 5V / 0.05A. Note: I replaced U5200 because PPCHGR_VDDA/VDDP was only at 4.5V. After replacing it with an ISL9240 (from a MacBook Pro M1 2020), it’s now back to 5V. Current measurements...

Hi, I have an iPad Pro 11” (3rd generation – model A2377) with a non-functioning Face ID. It consistently displays the message: “Move iPad higher/lower” during setup. When inspecting the TrueDepth system with an infrared-sensitive camera, I noticed that the dot projector is not emitting any...

Hi, I have a MacBook Air M2 with a non-working trackpad and keyboard. I tested it using a known-good trackpad and keyboard, but they didn’t work either. Based on this, I suspect a logic board failure. Here are my measurements so far: UT3A0 Output: TPAD_KBD_WAKE_L = 1.8V UT320 Output...

Hi, I have an A2442 (820-02098 / MacBook Pro 14 M1 Pro) that is power cycling every 3 seconds. The USB-C meter shows the following sequence: • 5V (PPBUS_AON = 12.26V) • 19V (PPBUS_AON = 11.96V) • Power cycling occurs (PPBUS_AON = 6V), and the cycle restarts. I have noticed that...

Hi, I have an A2337 (820-02016) which is draining the battery while it is sleep mode. (Like 20-30% during the night) Note: - Battery has 100% health, so basically new.

Hi, after a CD3217 replacement the MacBook Pro M1 (A2338 / 820-02020) no longer boots into the OS and it shows the "restore" screen. I have noticed that PPBUS_AON is 11.98V instead of 12.3V, any idea where I should start? Note: - Device restore via AC2 doesnt work ... Error 4014. - PP5V_S2 =...

Hi, Im facing keyboard and trackpad issues (no function) on an A2337 (820-02016 / MacBook Air M1). I have already tried the following: Replaced the flex cable (between logic board and trackpad) Tried another top case (same issue) Replaced UT330 and UT355 IPD_SPI_EN_CON = 0.596 IPD_SPI_EN =...

Hi, I have an A2337 (820-02016) with 5V and 0.02-4 A on both USB-C ports. - PPBUS_AON = 11.80-12.25V - PP3v8_AON_VDDMAIN = 3.8V - PP5v_S2 = Missing - PP3v3_S2_UPC = Missing - PP1v25_S2 = Missing - PP1V8_S2 = Missing - PP3v3_UPC0_LDO = 3.3V - PP1v5_UPC0_LDO_CORE = 1.5V - PP3v3_UPC1_LDO = 3.3V -...

Hi, I have here an A1989 (820-00850) with a water damage on J8500 between PIN 1 , 3 and 43. Note: EDP_INT_AUX_N is shorted to ground - so I guess the onboard GPU got fried by the backlight circuit (PPVOUT_S0_LCDBKLT), right? I was able to restore the device via AC2 - no issue. But im not...

Hi, I have here an A1990 - Touchbar doesnt work. (no signs of life) Note: J5100 was corroded - cleaned it and removed the corrosion. (Flexcable was fine) J5100 power lines: - PP1V8_SLPS2RSW_DFR: 1.8V - PP5V_G3S_DFR_FILT: 5.1V J5110 power lines: - PP1V8_SLPS2RSW_DFR: 1.8V - PP3V3_G3HSW_DFR...

Hi, i have here a „820-01041-07“ with PPBUS_G3H on 12.23V. When I connect it to the charger (just the logicboard / without battery) I’m getting 19.6V / 0.00-0.05A (it’s power cycling). Already tried a DFU restore via AC2, sadly it ends with an error. (T2 is getting warm during DFU restore)...

Hi, I have a MacBook Pro M1 which doesn't recognize the battery (0% - Cross Icon). PPVBAT_AON (with charger and battery connected) = 11.96V PPVBAT_AON (without charger and battery connected) = 1.4V PPVBAT_AON_CHRG_REG = 11.96V PPDCIN_AON_CHRG_R = 20V I assume the board is fine because both...

Hi, MacBook Air (M1) got water damaged in area of the CD3217 (USBC0) ... device is able to boot. - 20V boost is working fine which means that the CD3217 is fine - Issue: Unable to power USB device on USBC0 port // USBC1 port is working fine. What should I check first? Is there something wrong...

Hi, I have here an A1989 where the left USB-C ports are not recogizing any peripherals - charging is working - right side no issues. Could it be that the THB IC is damaged or corroded? (Should I reflow the IC?) Note: The MacBook was water damaged in that area, (U3200 was bad)

Hi, every had such a strange behaviour on an A1989?

Hi, PPBUS_G3H is looping between 12.25 and 12.57V on an A1989 (820-00850). Also the output of the USB-C ports are weird. - 19.4V - 0.00-0.04A I assume the CD3215s are fine because I get 20V, right? What should I check next?