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2. SGH-D720 Flow Chart of Troubleshooting and Circuit Diagrams
2-1.Baseband
2-1-1. Power ON
'Power On' does not work
Check the current
consumtion more than
100mA
YES
Check the Vbat(battery+ O )
Voltage more than 3.3V
YES
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
UCP100 pin B14
= 1.8V
UCP100 pin A15
= 1.6V
Check the clock signal
at pin1 of OSC100
Freq=12MHz
YES
'Power On' does not work
END
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Charge the Battery
Check BTC300, C308 and C307
Check TR600, TR602 and D601
Check U605 and C606
Check U605 and C605
Check U604 and C618
Check the clock generation circuit
(OSC100)
2-
28
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