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Sorry. My brain was off yesterday afternoon. Yes, the model number and board are the same.

Thanks for that. This is for a different board. Does it work on 820-01949? Also, do I need to change the Serial number?

I managed to back up the firmware from the IC, but I can't find another good firmware anywhere. Can you help me with that?

Data is very important on this one. I never flashed U4770 SoC ROM. I will try to find how to do it.

Hi, everyone. Need help, please. Die suddenly for no reason. The logic board is very clean. When connecting in AC2 it shows straight in Recover mode. We tried to revive it in DFU mode and it failed. LogicBoard stand-alone. PP1V2_AWAKE - 1.2V PP1V8_AWAKE - 1.8V PP3V3_AWAKE - 3.35V PP1V1_SLPS2R...

Thanks for your correction of my assumption. I'm still a beginner and learning a lot with you. It will improve my skills in future repairs and help more people with this issue.

I tough it may be useful for everyone with the same problem. PP1V1_UPC_XB_LDO_BMC Missing. This line is created by TB ROM (U2890) this IC has its own firmware. All LDOs on the CD32 ON, except PP1V1_UPC_XB_LDO_BMC I've replaced both USB-C controllers 2 times, ISL9240HI (U7000), W25Q80DVUXIE...

I've checked on another working board and measurements in Diode mode on: L7430 CPUGT_SW3 - 0 L7420 PPVCCGT_CPU_PH3 - 0 is same as on the faulty logic board. L7430 CPUGT_SW3 - 3.2 Ohms L7420 PPVCCGT_CPU_PH3 - 3.2 Ohms Is this normal?

For some reason, the backlight stopped again. No idea what's going on here.

Diode mode measurements on RB923 pin 1 were incorrect, but resistor is OK. U8400 resoldered. Backlight is on. Thanks

The CPU VCORE voltages I mentioned above is for DIODE mode. Not Voltages. Voltages is. L7430 PPVCCGT_CPU_PH2 - 0V L7420 PPVCCGT_CPU_PH3 - 0V L7410 PPVCCGT_CPU_PH1 - 0Vv L7210 PPVCC_CPU_PH1 - 1.08V after about 8 secs drops to 0.64V L7220 PPVCC_CPU_PH2- 1.08V after about 8 secs drops to 0.64V...

H, everyone. I've received it to repair as liquid damaged. Dead board and after some work and jump wires on R5620 pins 3 and 4 to it's test points and cleaning, it now turns on. Bad liquid on LCD connector and no display. EDP_INT_AUX_N shorted. Fixed by replacing the U9850 MUX converter. It now...

Hello everyone. I need help, please. Got this Mac in to repair, and it's stuck on chime sound, sound is cycling, video link showing the issue. It gets backlight, but no display. BIOS flashed with another Clean ME firmware and still the same. PPBUS_G3H = 13.3V PP3V3_G3H = 3.41V PP3V0_G3H = 3.0V...

The short was coming from a cap on the same line, PP3V3_S2 . After a 2nd full inspection under microscope, I found this crack on the cap, Replaced and it turned on. The problem was that the cap was causing the Wi-Fi module to shine under the thermal camera. After all, I had to replace the Touch...

Checked all LDOs lines on all chips and diode values are OK. After start to remove the Black glue around the U3100, I found corrosion on R3108 side 1. R3108 replaced. All works amazingly fine. Thanks 2informaticos

Hi everyone. Need help here, please. Liquid damaged around U3200/U3200 and UB300. PP3V3_G3H shorted – CB300 faulty and replaced. I have already checked all rails on page 120 and 121 for shorts and all rails are fine. 2 Caps replaced as it was bad corroded. C3108 - PP3V3_UPC_XA_LDO C3100 -...

The charger I'M using is an original 96W. All the coils are good in diode mode, including SSD. Do you think that there is any chance that U7800 - CALPE-PMU is faulty?

Not pulsing. PPBUS_G3H - 12.30V 3V3_G3H_RTC - 3.38V

https://youtube.com/shorts/J0ouUxz3cgY?feature=share On this video, you can see T2 chip pulsing. I don't know if it was pulsing before, but I just realized now that these lines are pulsing every 2 sec. PP1V8_SLPS2R → Pulsing PP1V8_AWAKE → Pulsing PP1V1_SLPS2R → Pulsing PP0V8_SLPS2R → Pulsing...

I just tried DFU revive with another good battery and same results.