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820-02016 20V 0.05A DFU error 4014

A

ajdoc

Member
Board in DFU mode, no corrosion.
After unsuccessful restore show error 4014.
"4014 - Unexpected reset. Might be caused by T2 RAM error, power rail failure or even a bad battery.

History: Client left MacBook for long period of time so battery voltage was too low to be charged.
Battery replaced and after a few days came back.
Board was in DFU.

Tried of course with another battery and board only as well.

PPBUS_AON 12.27V
PP3V3_AON 3.28V
PP1V8_AON 1.8V

0.8V, 1.25V and 2.5V AWAKE_NAND rails have correct voltage.

Any idea?
 
A

ajdoc

Member
Yes, battery was charged.
It acts strange. I fitted board back to another restore attempt and board boots fine (with data).
Disconnected battery and fitted all brackets/screws etc and again have 20V 0A and DFU mode.

Next I fitted board to known working chassis with screen, fully charger genuine battery and USB ports and it is still in DFU mode (error 4014).
Any idea why it works fine from time to time?

Fitted known good board to clients chassis and all works fine.
 
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