Wcdma Band8 Tx - Samsung GT-P3100 Servise Manual

Level 3 Repair

8-3-25. WCDMA BAND8 TX

U101 PIN18 : About
22dBm ?
Check the Voltage at
C103 = V_BAT ?
Check C117, L112 :
About 22dBm ?
Check component
soldering status OK at
Check
C154, L123
About 22dBm ?
Check the Voltage at
C157 = V_BAT ?
Check the Voltage at
C138 = V_BAT ?
Check C146
About 0dBm ?
Check the voltage at
{C150= VBAT_RF ?}
& {C158, C159 C160 =
V_BAT?}
& {C149, C170 = 2.85V ?}
& {C145, C165 = 2.65V ?}
& {C148, C172 = 1.8V?}
& {C166, C171, C147) = 1.2V?}
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YES
NO
NO
YES
YES
NO
NO
F100
YES
YES
NO
NO
YES
NO
YES
YES
YES
YES
CHECK soldered
- CN100, C119, C112,
C118,L106,C120,C113,ANT101
Resolder or change
U101, C103
Resolder or change
C117, L112
Resolder or change
F100
Resolder or change
C154, L123
Resolder or change
U102, C157
Resolder or change
U103, C138
Resolder or change
C146, C152
NO
Resolder or change
U104
8-60
CONTINOUS TX ON CONDITION
TX POWER DAC:14500 CODE
APPLIED
WCDMA Band2 CH : 3013
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB