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POWER KEY, VOLUME KEY, MAIN KEY PART
Press Power key,
Volume Key, Main Key
Yes
Power Key NG?
NO
Volume Key
NG?
NO
QWERTY Key
NG?
NO
The End
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Pressing power k
ey 2Pin in TAC
500= High?
1Pin in TAC500
= High?
Change Main PBA
Pressing Volume
Up, Down Key 2Pi
n in TAC800, TAC
Yes
801=High?
1Pin in TAC800,
801 = High?
Change Main PBA
Key FPCB
Yes
Disconnect or
Break Down ?
Check SLC801
& Neighboring Circuits
9-17
Flow Chart of Troubleshooting
Yes
NO
Yes
& Neighboring Circuits
NO
Yes
Check TAC800, TAC801
NO
Yes
NO
Yes
Check U502,U503
& TR500
Check TAC500
Connect correctly or
Change Key FPCB
Connect correctly or
Change Key FPCB
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