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U8100 Pins 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 16, 17, 18, 19, 20 – 0V on all of than. Pin 12 – 5.14V Pin 15 – 4.93V Diode on Pin 2 is not normal if compared with another boards. Not same boards, but I think it should at least be similar. Pin 2 – 0.054

The resistor was measuring correct, but I replaced anyway, and for some reason it made a difference. R8123 Replaced Pin 12 – 5.14V Pin 15 – 4.93V Those are the only pins with voltage.

U8100 Voltage on pins. 6 – 0V 12 – 0V 16 – 0V 17 – 0V resistance to ground 1 - 350 Kohm 5 - 411 Kohm 9 – 107.6 ohm All resistors are fine.

Coming back with quick update and asking for more help, please. All 4 RAM modules replaced. Same capacity, but different brand. I had to move a resistor to change MEMORY CONFIGURATION STRAPS. Originally it had a Micron Memory and I have replaced for a Samsung Memory. R1331 moved to R1330 to fits...

1.3V injected on PP1V1_S3 and only RAM modules are getting slightly hot. All 4 removed and the short on the board is gone. On the modules, the pins are shorted to the ground. I will get new modules, replace them, and return here with an update.

I removed the Current sensor R8118. Diode mode: PP1V1_S3 - 0 (2.2Ohms to ground) PP1V1_S3_REG_R - 0.448 ISNS_CPUDDR_P - 0.706 ISNS_CPUDDR_N - 0.706

Is this normal? PP1V1_S3_REG_R - 0 Diode mode Res. to ground 2.6 Ohms

This is what happens when trying to revive. The System cannot be restored on this device. The operation couldn't be completed. (AMRestoreErrorDomain error 6 - Failed to handle message type StatusMsg (Operation failed)) [AMRestoreErrorDomain - Ox6 (6)]

For some reason with the firmware that you gave me, it gets stuck on 5V. I've reprogrammed it with the original firmware and it is back to 20V.

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...