5. Trouble shooting
START
Connect power supply to the DUT Vbat = over 3.35V
Yes
Check
ìPWRONî signal of TP1 
2.0V
Yes
Check R112 when push the power key
Yes
Check
ìPWRONî signal of TP1 
0V
Yes
Check the all LDOís output
Is it correct?
Is the 26MHz clock from TP2 X100 of U102 ?
Replace main PCB
No
Check the
BACKUP Battery
No | Check solder R112 |
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| or |
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| Replace Dome Switch | PWR key | ||
| (PWR key) | |||
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| TP1 | |
No | Check solder | Q201 | ||
| Q201 |
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No | Check solder whole LDO |
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| parts or replace it |
| TP2 | |
No | X100 | |
Check solder | ||
| ||
| Replace |
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| Only for training and service purposes |
