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Level 3 Repair
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
Yes
Yes
Check TAC500, TAC501
Yes
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Pressing
power key,
R506 = High?
NO
Change Front Ass'y
1st pin of TAC500,
TAC501 = High
Yes
Pressing Vol key
ZD505, ZD506
= High ?
NO
Key FPCB
Disconnect or
Break Down ?
NO
Check HEA501
& Neighboring Circuits
8-25
Yes
Check U501
& Neighboring Circuits
NO
Change Main PBA
Yes
Change Main PBA
Yes
Connect correctly or
Change Front Ass'y
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