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MacBook Pro A1398 stuck on Apple logo with trackpad flex. Replacing the trackpad and tape does not help. Only turns on without trackpad flex in the motherboard - J4800. I did a pram and SMC reset. Please help.
PP5V_S5_CUMULUS - 5v
R4800 and R4808 are ok
Macbook 15 Pro A1708, stuck 5v. Any idea ?
CB300: 3V3_G3H: Diode-Mode: 0.331
Diode Test on LDO Rails:
PP3V3_UPC_TA_LDO: on CB308: 3.3v, diode-mode: 0,492 only in one USB port
PP1V8_UPC_TA_LDOA: on CB306: 1.805v, diode-mode: 0,502 only in one USB port
I have iMac 27 5K 2019.
On the startup, mac will random shut down on 1-2 second from start.
After shut down is displayed only 2nd diagnostic LED.
I checked other power supply, new BIOS, new processor, new RAM, resetting NVRAM, SMC, RTC battery and checking visible damage.
I had no backlight.
U7701, d7701, f770, rebuilt XW7720 and cleaned the rest.
now the backlight works but D7701 pin 1 - 6,8v pin 2 - 24v.
Q7706 pin 6 - 6,75v
The macbook turns on from the keyboard but does not detect it after starting.
Mac is stock on 20V 0.3A.
Its stuck in recovery mode in Apple configurator 2. It begins installing the system using system restore. The outputs
"failed to recive message from device, might be a connection problem with usb host) [AMRestoreErrorDomain - 0x9 (9)]
SLPS2R I AWAKE are present
What to do ?
Hi guys this time I have a 820-00163 board with no water damage or corrosion. I checked:
I am new to this forum. My name is Marcin and i work a electric repair shop in Poland. I am new to MacBook repairs and have lot of knowledge to complete. As for now i have a MacBook pro model A1707 820-00928-04 that wont start.
I can see under my microscope that someone soldered the U3100...