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2. SGH-D730 Flow Chart of Troubleshooting and Circuit Diagrams
2-
1
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2-1.Baseband
2-1-1. Power ON
Check the current
consumtion more than
100mA
Check the Vbat(
O)
Voltage more than 3.3V
Downloader again
NO
Charge the Battery
NO
Check
CN304
,
C387
NO
YES
YES
YES
YES
'Power On' does not work
Check the pin
4 of Q303 is more
than 3.3V
Check the pin
1 of Q303 is more
than 3.3V
U100 pin A19
= 3.0V
YES
Check
Q303
,
Q305
and
D302
NO
Check
U308
,
U100
and
C109
NO
U100 pin B14
= 1.8V
YES
Check
U308
,
U100
and
C106
NO
U100 pin A15
= 1.6V
YES
Check
U304
,
U100
and
C101
NO
'Power On' does not work
END
Check the clock signal
at pin1 of OSC100
Freq=12MHz
Check the clock generation circuit
(
OSC100
)
NO
YES
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②
③
④
⑤
⑥