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SGH-D720 Flow Chart of Troubleshooting and Circuit Diagrams
2-
5
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2-1-2. Initial
UCP400 pin C16
(C410, C411)
= 1.8V
Check U606
NO
YES
Initial Failure
UCP400 pin B14
(C406)
= 3.0V
Check the U500 and C516
NO
YES
Check and resolder SLIDE connector CN800
if there is solder bridhe between the pins
END
YES
YES
Check the U500 and C517
NO
YES
Check the clock
signals at
pin3 and pin5 of
OSC400
Freq=13MHz
Check the clock generation circuit
(OSC400)
NO
Check the pin C12
of U500 is "High"
Check U500 and C514
NO
YES
Check the
pin 2 of
U606 is "High"
