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Pin1 of LT400 - PPBUS_AONSW_IPD = 11.97V Pin2 of LT400 - PPBUS_AON_IPD_FLT = 11.97V (without battery connected) Edit: I think it’s a LID sensor/circuit issue because when I open the MacBook (display) it doesn’t boot overall. I have to press the power button manually. Maybe that’s the reason...

I have checked both sides, same results. (LT400-3) 11.97V without battery connected. (battery charging is working) What do you mean with "bypass the coil"?

LT400 = 11.97V - seems to be low. LT401 = 3.3V LT402 = 3.3V LT403 = 5.2V

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 =...

U8100 and U7700 getting warm after like 20seconds - maybe i just killed the PMUIC and U7700 🤞 (5V / 0.40A)

Fixed - R5222 was blown replaced it now PPBUS_AON is back on 12.27V. I noticed that PP3V8_AON_VDDMAIN is just at 2.8V (too low) instead of 3.8V. Step 1. Check for a short to ground on PP3v8_AON_VDDMAIN. C5887 is a good place to measure from. Normal diode mode to ground reading = ~.350. -...

My fault other way around … C5220 = 180k ohms C5260 = 2.3 ohms so R5222 and R5221 right?

C5220 = 2.3 ohms C5260 = 180k ohms

C5220 = 0.520 C5260 = 0.580 F5200 removed / C5254 = 0.9-2.5V (looping) Yeah true ... its a reset signal - sorry.

Yes I have tested it without anything connected. (no audio board etc.) PPDCIN_AON_CHGR_R = 5.0-5.1V CHGR_AUX_DET = 1.2V CHGR_RST_IN = missing / 0.580 PPCHGR_VDDA = 5.0-5.1V PPCHGR_VDDP = 5.0-5.1V CHGR_AMON = missing / 0.591 CHGR_BMON = missin / 0.592

I have re-soldered the original PMU IC .... PPBUS_AON is still looping between 0.9 and 1.1V - what the ... ? The following are missing .... - PP3v8_AON_VDDMAIN / 0.320 - P3V8AON_PWR_EN / 0.565 - CHGR_EN_MVR / 0.598 U5200 is good - Will be PP3v8_AON_VDDMAIN generated when PPBUS_AON is at 0.9 -...

Hmm IC looks good and perfectly soldered - I will re-do my work. Edit: After re-do same result - so I guess the IC is faulty because PPBUS_AON is looping between 0.9 and 1.1V … I hope I will get a refund (source: AliExpress)

I have replaced the U8100 - PPBUS_AON is now on 1V …. Output USB-C: 5V / 0.04A

Ok not the battery is causing the "short" - only happends when the audio board is connected. PPBUS_AON (with audio board connected) = 8.1V / Diode mode says "OL" (measured while turned off - not connected to charger/battery) PPBUS_AON (without audio board connected) = 12.26V I think I will...

- PP1V2_S2 = Missing / 0.336 - PP3V3_S2_UPC = Missing / 0.447 Clicking noise is coming from "Q5800" - When I connect the battery and USB-C cable (for charging) the values are 5V / 0.36A - Q5800 is getting hot. I have already replaced it - no short on PPBUS_AON after doing the same (battery...

- MPMU_VREF_ADC = Missing / 0.559 Which LDOs are missing? I can't find any LDOs (without NC) - could you please help me out. (im on page 34)

Board looks clean and the previous owner told me he that he close the MacBook and on the next day it stopped working. (no boot) - PP5v_S2 = 0.287 - PP3v3_S2_UPC = 0.447 - PP1v25_S2 = 0.268 - PP1V8_S2 = 0.330 I have checked the following: - PP1V4_LDO_PREREG = Missing / 0.291 -...

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 -...

Reflow of the J5100 solved the issue - thanks for your help.

TB is now working. After reconnecting the flex all (TB, camera and ALS) is working again - what the hell? Edit: Sometimes it’s working sometimes not. Edit2: ALS and camera is always working - TB is now dark again.