Search results

Did you maintain chips position when soldered them on the board? Just in case, you should try to reflash/replace corresponding TBT ROMs; make backups anyway.

Magsafe's CC1 voltage should be same as other ports CC1/2 lines, depending on the cable orientation. BTW, Magsafe port uses only CC1, no CC2 line neded there. 1.66V looks good enough. Anyway, on Magsafe case, there are more chips involved than USBC side. What voltage do you get on PPBUS_AON and...

Check UC830 voltages.

Unlock what? Test if it is recognized in Target Disk mode by other Mac. A thunderbolt cable may be needed.

If you mean U4770 (SoC ROM), just erase it. It will be reflashed with correct information in DFU.

https://www.google.com/search?q=MacBook+Air+M4+2025+NAND+upgrade&client=firefox-b-d&hs=ZJe9&sca_esv=abeb4f522ce11e62&ei=ADBAadywJb397_UP-tTG8Q0&ved=0ahUKEwjcsNXj-r-RAxW9_rsIHXqqMd4Q4dUDCBE&uact=5&oq=MacBook+Air+M4+2025+NAND+upgrade&gs_lp=Egxnd3Mtd2l6LXNlcnAiIE1hY0Jvb2sgQWlyIE00IDIwMjUgTkFORCB1cGd...

T2 machines don't need working CPU to access SSD. SSD is directly connected to T2. So internal data can (possibly) be retrieved in DFU mode; but ONLY by an authorized Apple service center.

I saw several wrong readings on that page. May be the case now. BTW, you may have problems getting lower reading on a power rail, instead of expected. However mentioned rail is not a LDO; it should come on later.

U8100 & U7700 have more LDOs. Check diode mode on the ones with missing voltage; compare with good board.

Do you get correct voltages on the other SSD side? An authorized Apple service shop can try to recover the data in DFU mode. Connection with Apple server is required. BTW, write directly into bottom reply box, instead of clicking Reply button. I don't see any reason to quote an entire post...

Any history available? All MPMU/SPMU LDOs OK?

You can try that. Think first if is worth to do it...

Which big coils get voltage?

"0.540 (should be 0.752)" Not necessary true. Measuring with different multimeter on the same board, or other similar board, you can't expect same exact readings. Did you test with known good touchbar?

Post voltage on all (big) secondary coils; don't forget L9080/580.

You may have SSD problems...

ALWAYS check diode mode, or ohm scale ONLY with power removed (charger and battery)! When you go to DFU mode, do you get DFU, or Recovery logo?

I meant power rails, not enable, or power good signals. "P1V8_AON_EN stable at 1.8V" UC120 output stable also? All MPMU/SPMU LDOs are stable? What about SSD power rails?

Such layers boardview is not available. You can check continuity for some traces which supposedly pass through that area.

First of all, welcome to the forum! If NANDs have been affected somehow by the liquid spill, data is lost. What is actual diode mode reading (red probe on ground) at L9080? Do you get all SSD and G3S voltages?