Wcdma Receiver - Samsung SGH-Z240 Service Manual

Flow Chart of Troubleshooting

9-19. WCDMA Receiver

Rx On Rx On
RF Input: 10700 CH RF Input: 10700 CH
Cell Power:-40dBm Cell Power:-40dBm
YES YES
NO NO
RFS400( RF Connector) RFS400( RF Connector)
C406 ≥-50dBm ? C406 ≥-50dBm ?
YES YES
NO NO
F400(Front End Module ) F400(Front End Module )
Pin#19 ≥-50dBm ? Pin#19 ≥-50dBm ?
YES YES
NO NO
F502(Duplexer) F502(Duplexer)
Pin #5 ≥-50dBm ? Pin #5 ≥-50dBm ?
YES YES
NO NO
U505(RFR6250 ULNA_IN) U505(RFR6250 ULNA_IN)
Pin #18 ≥-65dBm ? Pin #18 ≥-65dBm ?
YES YES
NO NO
U505 (RFR6250 ULNA_OUT) U505 (RFR6250 ULNA_OUT)
Pin #14 ≥-65dBm ? Pin #14 ≥-65dBm ?
YES YES
NO NO
F503(UMTS RX Saw Filter) F503(UMTS RX Saw Filter)
Pin #3,4 ≥-65dBm ? Pin #3,4 ≥-65dBm ?
YES YES
NO NO
U202(RFR6250 IMIXM,IMIXP) U202(RFR6250 IMIXM,IMIXP)
Pin #8,9 ≥-65dBm ? Pin #8,9 ≥-65dBm ?
YES YES
U505 RX IQ signal U505 RX IQ signal
≥1V ? ≥1V ?
NO NO
YES YES
Check UCP100(MSM6250) Check UCP100(MSM6250)
YES YES
END END
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Resolder or Change Resolder or Change
RFS100 RFS100
YES YES
Resolder or Change Resolder or Change
F400 F400
C423=L C426=L C429=L ? C423=L C426=L C429=L ?
NO NO
Control Path & check NV data Control Path & check NV data
Resolder L511 or Change Resolder L511 or Change
F502 F502
Check or Resolder Check or Resolder
L508, C527 L508, C527
Resolder or Change Resolder or Change
U505 U505
Resolder C541 or Resolder C541 or
Change F503 Change F503
Check the path of Check the path of
F503 & U505 F503 & U505
Check& Resolder Check& Resolder
L504 L504
NO NO
VREG_TCXO, VREG_RFRX VREG_TCXO, VREG_RFRX
Of U505 Of U505
≒ 2.85V ? ≒ 2.85V ?
YES YES
Resolder or Change Resolder or Change
U505(RFR6250) U505(RFR6250)
9-34
F400 F400
Check Front End Module Check Front End Module