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SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting
9-20
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POWER KEY, VOLUME KEY, MAIN KEY PART
Press Power key,
Volume Key, Main Key
Power Key NG?
Check U501
& Neighboring Circuits
Yes
Pressing
power key,
R506 = High?
Volume Key
NG?
Yes
1st pin of TAC500,
TAC501 = High
Yes
Change Main PBA
Key FPCB
Disconnect or
Break Down ?
Yes
QWERTY Key
NG?
Yes
Change Front Ass'y
NO
NO
NO
NO
Check HEA501
& Neighboring Circuits
Yes
NO
Pressing Vol key
ZD505, ZD506
= High ?
Check TAC500, TAC501
Connect correctly or
Change Front Ass'y
Yes
NO
The End
Change Main PBA
NO