Samsung i780 Service Manual page 89

Flow Chart of Troubleshooting
9-15. PCS Transmitter
TX ON
(PCL 0 level)
F100 pin 11 >=
0 dBm
NO
F100 pin 15 >=
0 dBm
NO
PAM100 pin 16
>= 0 dBm
NO
PAM100 pin2 >=
- 25dBm
NO
Check U100
YES
Resolder RFS100,
L100, L101, C103, C109
YES
Resolder or Change F100,
YES
L114, C129, C140, C127
YES
PAM100 pin3(BS) = H
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NO
Check F100 truth
table
Pin 4 : LOW
Pin 5,6 : HIGH
Check
Vramp
NO
YES
Check Operating
mode
Pin1(EN) = H
NO
9-42
Check R103, R105,
R109, UCP200
Resolder or Change
F100
YES
Resolder PAM100,
Check UCP200
OK
Check VBAT or
Sesolder / Change
PAM100
Resolder or Change
R113, UCP200