Samsung SGH-L770 Service Manual page 49

10-1-6 Transceiver 3G Rx part
Channel 10700, high gain mode(LNA)
Cell power :-60dBm
Check the pin #1 of
MOD101 ≥ -64dBm
Check the pin #1 of F202
Check F202 & C217,C220
Continuous RX ON
YES
MOD101 > -63dBm
YES
Check pin #21 of
YES
Check pin #2 of
DUF201 ≥ -65dBm
YES
Check pin #2 of
Q202 ≥ -66dBm
YES
Check pin #5 of
Q202 > -51dBm
YES
>-51dBm
YES
YES
END
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Check soldered status of
NO
Resolder or Change
NO
OR check C115>1.4V
C116<0.4V,C117<0.4
NO
NO Check soldered status of
Check or Resolder Q202
NO
Check #1 of Q202
NO
Resolder or Change L212,C219
NO
resolder or change
10-9
Flow Chart of Troubleshooting
R116
MOD101
Resolder C200
C120,C125,L107
OR
=1.8V