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R5101/02 no soldered. UPC_I2C_INT_L 0V. USBC2_AUXLSX_N broken pad under ug400, is that a problem for the board to boot without battery ?

Sorry for that. Yes battery is recognized and shows correct percentage. With magsafe only : PPBUS_AON 11.98v 3V8_AON 3.78v J5101 : 3 1.23V 5 0V 7 0V 9 0V 11 0V

Trackpad clics wen battery is disconnected and magsafe light is orange. But the board is not booting

Thanks for your response. I don't have another battery to try. But the board won't boot without battery. The battery discharge function well. The board should boot without battery with magsafe and usb c but it doesn't.

Hello, I got an a2442 with some liquid damages. After some replacements it boots fine, but won't charge. The magsafe light is orange but no charge, and none of the usb c will charge it. I tried dfu restore successfully but it still won't charge. Where should I start ? Thanks for helping,

Hello, i would be pretty happy if someone here is able to sell me apart UL000 or the 339S00758. That chip is on every new m1 macbook imac or mac mini. I can buy the full donor board if you prefer.

Yes PPBUS_AON is stable. Board is taking 20V and around 0.45 amps then drops to 0.12 amps. I noticed smth strange, sometimes the board will stay at 5V, unplugging and plugging back will make it go to 20V. It may be UL000, if no one is having a solution i’m just going to wait until a donor...

Any idea of what can cause u8100 to cycle ?

i tried both : to maintain and without maintaining as explained in logi wiki Both will show the machine in ac2 only for 2s

I tried with the force dfu button, i can see the mbp in apple configurator 2 for 2s and then it reboots. No acces to any boot menu because it reboot before, but the machine can start the process to the recovery boot, but will shut down after few seconds.

Hello, I received a board from a new m1 mbp that had some liquid spill on it, pp3V3_S2 was shorted because of UL000 that was dead, after removing it the board do the chime, but has no display or caps lock, but trackpads clics, I cannot find another UL000 (wifi/bt module) because I cannot find...

Thanks for you help. I’ll give some feedback when the board will boot

Thanks for the information, I wasn't knowing that. Do U7210/20 needs CPUCORE_FCCM to be ok? Because CPUCORE_FCCM is 0v. If that is not the problem, what do they need absolutely to provide voltage? and if they have all the power rails necessary but the board isn't sending anything to cpu does...

After doing some measurements with the multimeter I don't get anything, no usb c activity (no power), no voltage on L7210/20... but I'm still able to enter dfu mode and complete it. Even when fan spins I can't have any of L7210/20 or usb... VCore is still 5v. PPBUS is good.

L7410 is 0v L7420 0v L7210 0.8v L7220 0.8v sometimes L7220 and L7210 are 0v. VCORE 1 and 2 are 5V fan spins now

After some research, the MacBook is able to get in dfu mode, and complete the step 4. But I can't have any image, on the screen or on an hdmi adapter. I've tried a different lcd flex and the problem is still the same. Even with an other screen that is the same. What could be bad ? is it a dead gpu?

I won't inject voltage, I was wondering I any short was possible. L8100 is 1.2V P1V_PRIM_SW.. is 0V from U7800, PPVPCORE 0V. Meaning that U7800 is bad? U8213 is not on the board, I assume this is normal. U8290 only have PP3V3_G3H_RTC U8207/8 have nothing. The rest Is ok I'll try dfu mode tomorrow.

Yes, all seems to be fine... Maybe I did wrong measurements, that could be possible. But I don't think. I found that the cpu get hot for 2 minutes and then stop getting hot. For the solder and traces I'm sure, there insnt anything bad (visible). Should I inject some voltage or is it a bad idea...

near C8411, C8468, J3810,R8507, R5335, J5110 (30,26,24), C6900, L8410. All the corrosion affects only one component or a really really small area.

thanks for your answer, the board is a 820-01598-06. L7410 is 0V L7702 is 0V L7420 is 0v L7210 is 0v L7220 is 0v L7270 is 0.8v L8102 is 0.95v