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10. Flow Chart of Troubleshooting
10-1. Power On
10-1-1. PDA Part
Insert Power
Check pin 2 of V_BAT in
is more than 3.4
Check pin 4 in U504 is High
Check pin 1,2,5,6 in Q502
is the same voltage
Check pin 20 in U501 is 3.3V
Check pin 31,32 in U501
pin 2 = 1.8V, pin 35 = 3.0V
pin 15 = 1.8V,
pin 27 = 1.4V
Check Other Power Circuit
NG
U508
Yes
Yes
as 4pin
Yes
Yes
is high
Yes
In U501
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No
Change the Battery &check D806
No
Check U504 & neighboring circuit
No
Check the Q502 and related circuit
No
Check the related circuit
No
Check the related circuit
No
Check the U501 with neighboring circuit
10-22
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