Zener diode "HA"
Component appearing in 1 repair guide(s).

Appears in 1 guide(s)

MacBook Pro A1502 / 820-3476 / 820-4924 — Level 3 Repair Guide 820-3476
ReferenceD7010
PartZener diode "HA" (SOD-323)
FunctionRegulates Q7010 gate voltage to turn it on. Classic Rossmann fault.
RailsQ7010 gate
⚠ Failure
Open circuit → gate = source → Q7010 blocked → no PPBUS, no green LED.