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Flow Chart of Troubleshooting and Circuit Diagrams
3-5
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3-1-2. System Initial
Initial Failure
Check the VCCD_1.8V_E of
UCP300 is "High" When the phon
e is boot on
check the VCCD_1.8 of U303
is "High"
LCD display is O.K?
Sound is O.K?
END
Check CN301 and LCD part
Check Audio part
YES
NO
NO
YES
Check UCP300
Check U303
YES
YES
YES
NO
NO
Voltage at the R201 is
"Low-> High"?
NO
Check UCD300 and R201(or TP216)
Check OSC200
There is 32.768KHz wave
form at the C220, C221 ?
YES
NO
YES
Summary of Contents for SGH-S720i
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