Wcdma Band1 Tx - Samsung GT-I9300 Service Manual

8-3-26. WCDMA BAND1 TX

U103 PIN14
: About 22 dBm ?
Check the Voltage at
C110 = VBATT ?
Check L108, C118 :
About 22dBm ?
Check component
soldering status OK at
F100
Check C140,C127,L116
About 22dBm ?
Check the U105 PIN2
About 22dbm and C143 =
VOUT_CHARGER?
Check the Voltage at C114,
L132 = VOUT_CHARGER?
Check C137
About 0dBm ?
Check the voltage at
{C148= VOUT_CHARGER ?}
& {C158,C159, C160
= VOUT_CHARGER?}
& {C147, C172 = 2.85V ?}
& {C144, C170 = 2.65V ?}
& {C146, C174 = 1.8V?}
& {C173, C171, C145 = 1.2V?}
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NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
CHECK soldered
- RFS100, L109, C116, C117,
C191, C101, L103, L102,
ANT103
Resolder or change
U103, C110
Resolder or change
L108, C118
Resolder or change
F100
Resolder or change
C140,C127,L116
Resolder or change
U105, C143
Resolder or change
C114, L132
Resolder or change
C137
Resolder or change
U108
8-81
Level 3 Repair
CONTINUOUS TX ON CONDITION
TX POWER DAC:14500 CODE
APPLIED
WCDMA Band1 CH : 20000
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB