![background image](http://html.mh-extra.com/html/samsung/sgh-e780/sgh-e780_service-manual_1190629061.webp)
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-
24
9-17. DCS/PCS Transmitter
TX ON (0Level)
Yes
F101 Pin8
>= 20dBm
Yes
Resolder RFS100, C101
No
F101 pin13
>= 18dBm
Check F101
pin12 = H (2.68V),
pin9, pin10 = L
No
Yes
Check ANT Switch
control circuit
Yes
Change or Resolder F101
No
U103 pin18
>= 18dBm
Yes
Resolder L107,L120,C133
Check U103
+VBAT, pin7,14
OK?
No
U103 pin4
>=
-11dBm
Yes
Yes
Resolder or Change U103
Check +VBAT or U103
control signal
No
No
U102 pin7,8,9,10
>= 1V
Check U102
pin23,26,28,31
>=2.7V
OK?
No
No
Check & Resolder
U102, R103,R105,R106
RF26MHz, RF PSU Part
Yes
Resolder U102
Yes
Check UCP200
END
Summary of Contents for SGH-E780
Page 9: ...Specification 2 4 ...