Samsung GT-B7330 Service Manual page 59

POWER KEY, VOLUME KEY, MAIN KEY PART
Press Power key,
Volume Key, Main Key
Power Key NG?
NO
Volume Key
NG?
NO
QWERTY Key
NG?
NO
The End
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Yes
Pressing
power key,
R506 = High?
Change Front Ass'y
Yes
1st pin of TAC500,
TAC501 = High
Pressing Vol key
ZD505, ZD506
= High ?
Check TAC500, TAC501
Yes
Key FPCB
Disconnect or
Break Down ?
Check HEA501
& Neighboring Circuits
9-20
Flow Chart of Troubleshooting
Yes
& Neighboring Circuits
NO
NO
Yes
Yes
NO
Yes
NO
Check U501
Change Main PBA
Change Main PBA
Connect correctly or
Change Front Ass'y