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OK DEFINITELY solved this time around. one of the lines from L500 was pulled to ground. Replaced CD3217 again and all is working as it should. Thanks for the help 2informaticos!

SCRATCH THAT: USB ports function fine for USB DRIVES only. Will not see a mouse, keyboard or customers MIDI devices but will see and boot my MacOS installer drives no problem.... This is in OS and also on Boot menu. strange

SOLVED - Replaced both CD3217 chips and all functionality came back. Bit of a strange one as no liquid anywhere on the board.

Hi, got an M1 MacBook Air on the bench. Unit is extremely clean with no signs of a drop or liquid. Unit will power on as normal but will only charge NORMALLY from the USB C port closest to the user. the other port stays at 5V 0.3-0.4A and no cycling (CORRECTION - unit CHARGES at 5V3A when...

SOLVED! (I think). RB090 which connects PP3V3_UPC_TA_LDO and TBT_ T_ROM_HOLD_L was hanging on by a thread. No corrosion near it but I must've been putting just enough flex on the board for it to start up. Replaced and now I'm getting 20v correctly and consistently. Wish I noticed that before...

ok, reballed UB300 and UB400. Still the same issue. I've found I don't need a lot of pressure at all to make it get 20V but I have also noticed that while all 4 ports charge when the Mac is on, only the left side gets USB activity. Could this still be CD3215 issues?

I have already tried external USB. It gets loaded to a point then just reboots. J9600 looks very clean and I would remove it entirely if I thought that was the only way. Kinda nice having the lifeboat connector there JUST incase there is no other option. Not too sure if it would work due to the...

Ok, I reflowed U2800, UB000, U3100 and U3200. the CD3215 IC's are normally underfilled but when I got this board it was removed badly from U3100 and U3200. UB300 and UB400 have still got underfill but what I noticed is that if the board is out of the housing, it's stuck at 5V and restarting...

The Mac went to sleep and kernel panicked again. Full report below: panic(cpu 0 caller 0xffffff802141705a): "DSB0(MacBookPro14,2): thunderbolt power on failed 0x15788086\n"@/AppleInternal/BuildRoot/Library/Caches/com.apple.xbs/Sources/IOPCIFamily/IOPCIFamily-428.40.7/IOPCIBridge.cpp:1428...

Another 820-00923 that had severe liquid damage. I had to replace the thunderbolt controller chips, the U7000 charging IC and remove a short circuit on PPBUS_G3H to get it working. It works great when it isn't in sleep mode or trying to update. I am actually typing this message from this board...

I have got an 820-00923 with some heavy liquid damage around one of the thunderbolt sockets. It has been cleaned and components replaced to the point where it will turn on and pass AHT with no issues. but as soon as I type the customers password to login, the loading bar starts and then the...

Yes the programming is different for each board but the SMC chip is the same. Also you cannot buy brand new SMC’s, they have to come from donor boards as they cannot be programmed once out of the factory. On the 4924 boards the fan doesn’t spin until it gets past a certain temperature. Did you...

Thanks @2informaticos, it worked great! this can be marked as fixed.

Thanks very much! is it possible the new EFI just wasn't programmed at all or the FSYS could've been corrupted after updating the new EFI for Catalina etc.?

Got an 820-3437 Air on the desk which was turning on intermittently. U1930, C1930 and R1931 were corroded. Replaced and unit is booting but does not see serial number. SPI traces all good. I ordered and replaced the EFI chip which was meant to be pre programmed but still have the same issue. I...

Hi, by any chance could you let me know the diode mode readings of: PPVCC_S0_CPU PPVCORE_S0_GPU on your good board? I dont have one to test. Thanks.

definitely, I just checked again and actually measuring 3.262v on U7100. I will try replacing U7800 again but this will be the 3rd one.

Hi everyone, got an 820-00281-10 on my desk that has no signs of corrosion or liquid damahe and was told it just died one day. I started out getting 20v on the charger but not drawing anything. I then found that I had all S5 rails and S5_PWRGD but no PM_SLP_S5_L. I found that PP3V0_G3H was only...

Those 3 pins being soldered together isn't an issue as they are all connected. I would run a decent gauge wire from pin 38,39 and 40 to somewhere like C9797, C9799 or C9000. What voltage are you getting on L9701?

:rolleyes: