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SGH-D730 Flow Chart of Troubleshooting and Circuit Diagrams
2-
5
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2-1-2. Initial
U400 pin C16
= 1.8V
Check the
pin F4 of
U400 is "High"
Check
U301
NO
Check the
U400
NO
YES
YES
Initial Failure
U400 pin B14
= 3.0V
Check the
U400
NO
YES
Check and resolder LCD connector CN303
if there is solder bridge between the pins
END
YES
YES
Check the
U400
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
NO
YES
Check the
pin 2 of
U301 is "High"
①
②
③
④
⑤
⑥
