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2. SGH-D720 Flow Chart of Troubleshooting and Circuit Diagrams
2-
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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 BTC300, C308 and C307
NO
YES
YES
YES
YES
'Power On' does not work
Check the pin
4 of TR600 is more
than 3.3V
Check the pin
1 of TR600 is more
than 3.3V
UCP100 pin A19
= 3.0V
YES
Check TR600, TR602 and D601
NO
Check U605 and C606
NO
UCP100 pin B14
= 1.8V
YES
Check U605 and C605
NO
UCP100 pin A15
= 1.6V
YES
Check U604 and C618
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