Gsm850/ Gsm900 Tx - Samsung Galaxy Tab GT-P5100 Service Manual

8-3-19. GSM850/ GSM900 TX

U101 PIN14 : About
30dBm ?
Check the Voltage at
C103 = VOUT_CHARGER?
Check C125, L112, L113:
About 30dBm ?
Check the Voltage at
C131 = OUT_CHARGER?
Check C143:
About 0dBm ?
Check the voltage at
{C150 = VBAT_RF ?}
& {C149 = 2.85V ?}
& {C145 = 2.65V ?}
& {C151 = 1.8V?}
& {C152 = 1.2V?}
Check the freq. at C139
: 26MHz ?
GSM850/900 Transmitter is O.K?
END
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YES
NO
NO
YES
YES
NO
NO
YES
YES
YES
NO
YES
NO
YES
NO
CHECK soldered
C121, L108, RFS100
Resolder or change
U101, C103
Resolder or change
C125, L112, L113
Resolder or change
U103, C131
Resolder or change
C143
Resolder or change
U104
Change or resolder
OSC100
Resolder or change
UCP300
8-49
Level 3 Repair
CONTINOUS TX ON CONDITION
TX POWER DAC:14500 CODE
APPLIED
GSM850 CH : 190
GSM900 CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB