System Initial - Samsung SGH-S720i Service Manual

3-1-2. System Initial

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