Philips CT6558 Tuning Up Procedure & Operational Manual page 22

PHILIPS
Tuning Up procedure & Operational Manual
No back light：
1．Check back light and Resistance。
2．Check voltage of BLVDD，if it is abnormal, change 7400。
3．Check T602,T601 and relative parts, otherwise change it。
No display：
1．Check LCD FPC ,re-assemble the phone。
2．Check Connector on PCBA,，Pin on LCD PCB, whether CS,US,SS,CD。
3．Check LCD MODULE whether it's defective.
4．Otherwise change CPU,MEMORY, PMU in turn。
No camera function：
1．Check LCD FPC ,if it's defective, change it .
2．Check LCD MODULE(Sensor inside), if it's defect, change it .
3．Check LCD Connector on PCBA, whether it's CS,US SS.
4．Otherwise change CPU, MEMORY IC in turn.
No charging function:
Check if the battery connector is good.
Check whether the charging IC is good.
Check other relative parts around charging circuit
Check all the relative signals.
Change 7450,7400, 7300 one by one at last.
Revision :
Date :2004-9-7
Page No. : Page 22 of 22
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