820-00165 Board start with apple logo (half bar) and shutdown

raainxx

Member
Hi,
i have this board 820-00165 (mba 13 2017)
the board start with apple logo half bar and shutdown.
PPBUS and PP3V42 stay fix and good all the time.
Strange thing the board start without battery (normally can't start, I think and test another mba).
I try to clean me and same problem.
I try in bypass SMC mode, same problem.
Do you have an idea?
thanks
Best regards
 

2informaticos

Administrator
Staff member
"Strange thing the board start without battery (normally can't start"
All 00165 boards I worked, started without battery.

Try full known good BIOS; not just cleaning ME on original.
Did you try another SSD, or USB test macOS?
 

raainxx

Member
Hi,
ok for boot without battery, but when not boot, is not normal? (the other Mac is bad?)
I try Monday, the good bios. I try with new ssd, usb boot, without left io board, without trackpad and keyboard, same shutdown.
I can install the System on the ssd but not boot on complete system.
 

raainxx

Member
Hi,
I try with a new good bios, same problem. I try in safe mode (shift press), the mba work well.
maybe CPU?
thanks
best regards
 

raainxx

Member
I update some precisions.
i have default picture on display when "shutdown", just on the screen, fan work again, backlight present.
i see PPVCC_S0_CPU= 1,3V in this case.
Thanks
 

2informaticos

Administrator
Staff member
Probably iGPU issue.
See what happens booting Linux, or Windows.
If crashes when you will install grapchis driver, then you know for sure.
You can also try to run a memory test.
 
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