Search results

Try DFU restore first.

Try DFU keeping 3V3_S5 tied to ground. This will prevent Intel side to power up.

What is CPU core voltage behavior? Did you test the board alone, nothing connected?

Any error pops up starting in diagnostic mode? Just in case, try clean ME BIOS.

Test external video.

It doesn't appear on Disk Utility at all?

Did you test external video disconnecting internal LCD? "We can get to DFU mode and we get out of DFU mode without any problem" I hope no DFU restore has been done; SSD gets erased in such case. If data is still there, it can be recovered in DFU mode, by an Apple authorized service. If finally...

Try changing U5110.

What about U5110 voltages?

Any fault history available? Tried DFU with 61/87W charger and charged battery connected?

Do you get 3V3_S5/SUS?

Broken trace for R7520/3, for example...

Did you try SMC bypass?

Only NANDs from same board model can be replaced directly.

Correct value can only be checked out of board! Only low value resistors (usually under 100 ohm) can be checked onboard; depending on the circuit position.

You can buy with confidence here: https://www.masterliuonline.com/products/a2681-u8100-pmu-343s00554-for-820-02536

You should try more times. Once, I got a machine working even when DFU didn't complete. It never showed an error, just stuck in last step; however, machine started working. Be sure to have charged battery and good trackpad connected.

You must play with power button and FORCE_DFU. Is not always easy to enter DFU mode. First force the board off pressing power 5s. https://logi.wiki/index.php/DFU_Mode_Restore_(Macs)#DFU_Mode_using_external_switch

Try another SMC...

For this reason I told you to check donor board configuration...