Samsung GT-i9001 Service Manual page 52

8-3-8. KEY Function (volume key/ power key)
- volume key
volume key don't operate
press volume up key,
KBC(1), KBR(2) is
Active Low? (V400)
press volume down
key,
KBC(1),KBR(1) is
Active Low ? (V401)
PDA PMU key Signal
KBC(1), KBR(1) is
Active Low ?
Replace TAC600, TAC601, U501
Yes
Yes
Yes
Yes
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No
replace VOL_UP
No
replace VOL_DOWN
No
replace PMIC (U501)
8-23
Level 3 Repair