![Samsung SGH-J770 Service Manual Download Page 48](http://html.mh-extra.com/html/samsung/sgh-j770/sgh-j770_service-manual_356839048.webp)
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
10-40
10-17. PCS Transmitter
F100 Pin13
≥
25dBm
TX ON (0Level)
Check F100
pin9 = H (2.6V),
pin11 = L
F100 pin8
≥
25dBm
U106 pin18
≥
25dBm
U106 pin1
≤
-4dBm
Resolder F100
Check ANT Switch
control circuit
Resolder or Change
C122, C123, L112
Yes
Check U106
pin 2,3,4,5,6 OK?
Resolder or Change U106
Check +VBAT or PAM
control signal
No
No
No
Yes
Yes
No
Yes
Yes
Yes
Yes
No
No
No
Yes
END
Check UCP200
Resolder U107
Yes
Resolder RFS100, C113, L102
U107 pin 4,5,6,7
≥
0.2Vp_p
U107
pin11,12,16,29,32,
33,36
≥
2.8V
No
Check & Resolder
C128, C134, C137