Samsung i780 Service Manual page 93

Flow Chart of Troubleshooting
9-17. WCDMA 2100 Transmitter
TX ON
Sector PWR =
23dBm
YES
F100 pin 11 >=
10dBm
YES
F100 pin 9 >= 8
dBm
YES
F107 pin 1 >=
5 dBm
YES
PAM101 pin8 >=
- 15dBm
PAM101 pin8 >=
- 30dBm
F105 pin1 >=
- 30dBm
Check U100
& UCP200
NO
NO
NO
NO
YES
NO
YES
NO
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Resolder RFS100,
L100, L101, C103, C109
Check F100 truth table
Pin 5 : LOW
Pin 4,6 : HIGH
Resolder or Change
F107, L122, L123, L125,
C173
Check UCP 200
Check PAM101
pin 3 = L
pin 4 = L
pin 5 =H
Resolder or Change
F105, L124
9-46
Check R103, R105,
R109, UCP200
NO
Resolder or
Change F100
YES
NO
Check UCP 200
Check VBAT or
Resolder or Change
PAM101
YES