Samsung SGH-E840 Service Manual page 20

3-1-2. Initial
Initial Failure
Check VCCD,
VCCD_1.8V of UCP300
"High" when the phone
is boot on`
Check the
HP_CORE_1.575V of
U201 is "High"
LCD display is O.K?
Sound is O.K?
END
Yes
Yes
Yes
Yes
Yes
①
No
Check UCP300
②
No
Check U301
③
No
Check HDC602 and LCD part
No
Check audio part
3-5
Flow Chart of Troubleshooting