My Late 2013 Retina MBP is shutting down randomly. It gets a blank screen, and the keyboard is lit up for about 10 seconds, and then it powers down. There is no kernel panic, and nothing in the logs shows a shutdown. It reboots fine, and generally works for several hours before booting again.
When running the AST OS tests, I get the following errors:
[01/16/20 17:24:31] AirPort (test #9) - Wireless Module PCIe Root Port Hardware Register Test - Verifies PCIe root port error bits for wireless module doesn't register any NAKs [17:24:32] ERROR - -12100 [IOConnect error reading from PCI address space] -- TEST FAILED [01/16/20 17:24:32] SATA - 0: SATA PCI Register Test (test #1) - SATA PCI Register Test - Checks the SATA link error registers for dropped data packets using direct PCI access. [17:24:32] ERROR - -12105 [PCI driver IOService open error] -- TEST FAILED
I tried a number of things, but nothing worked:
- applied new thermal paste
- re-seated the cable from main board to i/o board
- re-seated video
- put in another SSD drive known to be working
- wiped drive and reinstalled Catalina (didn't restore)
- reset SMC and NVRAM
The machine has dual graphics, but disabling discrete graphics doesn't help.
Any ideas on what I can try next, and what the AST test messages mean?