Search results

I was not able to access DFU mode. Anyway JT400 (trackpad connector) it's water damaged. When the flex cable is connected i got short to ground on PPBUS_AON.

Right. Is worth to force DFU mode? How I can do it in this board? Thank you!

Unfortunately i'm not able to sop any bad solder or broken traces. There is any advice how to do that? really thank you. Anyway I post also that measures, is everything right with U5700? U5700 1 P3V8AON_DRVL1 0v 2 P3V8AON_SW1 3.77v 3 P3V8AON_DRVH1 3.68v 4 P3V8AON_BST1 4.50v 5...

Following @farfan14 post on diode mode to ground compare with good board good board farfan14 measurement / my faulty board format: PPBUS_AON 12.28v 480/ 588 12.32V PP3v8_AON 3.8v 157/ 374 3.77V PP3v3_S2 0v 402/ 470 0V P3V3S2_SW 0v 402/ 470 0V P3v3S2_EN 0v 703/ 950 0V...

Ok, I'll do! IF I remember correctly, I read in somenone other post that Macbook M1 U8100 and M2 one are different. At the moment, I don’t have a donor board to take it, and I don’t know if I’ll ever have one. As I mentioned, U5700, Q5800, Q5820, Q5840 have been replaced, taken from the M1...

My bad, PP3V8_AON_SPMU_ISNS_VIN CY1S5 3.77V RD580 voltages TPE018 TP_ISNS_SPMUHS_N ISNS_SPMUHS_N 3.77V TPE017 TP_ISNS_SPMUHS_P ISNS_SPMUHS_P 3.77V CY1SB PP3V8_AON_SPMU_ISNS_VIN 3.77V CY247 PP3V8_AON 3.77V

here it is: U8100 PP3V8_AON_MPMU_ISNS_VIN CY1M3 3.77V PPVDD_LDO20_14_8_3 C8300 0V DIODIE MODE 269 PPVDD_S2SW_VDD2H C83B1 0V DIODE MODE 36 PP1V8_AON R8620 1.79V PP3V3_S2_LDO C8331 0V DIODE MODE 1.25 (20k multimeter scale) PP1V2_AWAKE_PLL C8360 0V DIODE MODE 358 PP1V8_AON_MPMU...

Checked for knocked off components and broken trace, no one missing. Now PP3v8_AON is back, 3.78V

Done, but no progress at all. Same as before. No crap underneath seen. Then I had put logic in ultrasonic cleaner and now I did not have voltage on PP3v8_AON. Are you referring to diode mode readings? Probably my multimeter is not good quality one.

Right. I'll try to heating U7700/8100 with quality flux, even if I didn't notice any moisture nearby it. I would like also let you know that prior to post all my readings U5700 buck converter IC, Q5800, Q5820, Q5840 mosfets has been replaced, taken from M1 820-02020 logic. This was done as I...

There is anything I can do to confirm diagnosis? Anyway I have a donor A2338 M1 logic board, could U8100 be swapped? Really thank you for support provided to me. Hope to solve and get this macbook back to work.

U8100 LDO OUTPUT PP1V8_AON 0.18V PP3V3_S2_LDO 0V PP1V2_AWAKE_PLL 0V PP1V8_AON_MPMU 1.80V PP1V2_AON_MPMU 1.20V PP3V3_AON 0.35V PP0V855_S2SW_CIO 0V PP3V3_S2SW_SNS 0V PP1V2_S2_CIO 0V PP1V5_LDOINT_MPMU 1.49V U8100 LDO INPUT PP3V8_AON_MPMU_ISNS_VIN 3.77V PPVDD_LDO20_14_8_3 0V...

I'm using this BVR + schem. https://files.fm/u/zdwvagcwj . Anyway, the schematics are the same. Do I need to check LDO voltages direclty on U8100?

Exaclty Not getting all voltages in MPMU LDOs: VDD LDO 3/8/14/20 C8300 1 PPVDD_LDO20_14_8_3 0V LDO 2 DECOUPLING C8320 1 PP1V8_AON 0.18V LDO 9 DECOUPLING C8310 1 PP1V8_AON_MPMU 1.80V LDO 11 DECOUPLING C83B6 1 PP0V855_S2SW_CIO 0V LDO INT DECOUPLING C8380 1 PP1V5_LDOINT_MPMU 1.49V VDD...

Hello out there. I purchased this mac MacBook Pro 13'' M2 chip, model A2338, logic board number 820-02773 as partially working. Seller give me an apple report saying: "Liquid spill on trackpad flat, BMU battery flat and logic board. Macbook starts only when connected to DC IN and show...

Unfortunately my multimeters probe are not so small to let me check left/right J9600 pin inside connector, but it seems they are fine. I posted pictures of both connector and top plate. I cleaned both anyway. I really can't find any corrosion anywhere. But taking a look in U9400, it seems like...

Damn, I dunno what happened. I’m pretty sure the first time I had readings. took measures again: C9126 - PP1V8_SSD_COLD - 0v C9304 - PP0V9_SSD_FIXED - 0V C8724 - PP1V2_SSD_HOT - 0V C8714 - PP1V8_SSD_HOT - 0V C8732 - PP1V2_SSD_COLD - 0v C9323 - PP0V9_SSD_REG - 0v PP3V3_S5_SSD and it's 3.34V. I...

Hello people. I've purchased this mid 2017 13" MacBook Pro touchbar, logic board number 820-00923 who don't recognize internal SSD anymore. When powered on it display the question mark. Seller says that it simply stop working one day, no liquid spill, failed update or so. It can operate...