Samsung SGH D900i Service Manual - Page 57
GSM Receiver
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Flow Chart of Troubleshooting 9-12. GSM Receiver RX ON RF input : CH center freq : +67.7kHz Cell Power : -60dBm Yes F100 Pin11 No ≥ -65dBm Resolder RFS100,C103,L100 Yes F100 3,4 ≥ -68dBm Yes U106 pin 24 ≥ -70dBm pin 25 ≥ -70dBm No Check F100 pin10,pin14 = L Yes No Resolder C104, C105, L105 Yes No U106 pin 4,5,6,7 ≥ 0.2Vp_p Yes Check U200 U106pin 16,17,29 32,36 ≥2.8V pin10≥1.8V Yes No Check ANT Switch control circuit Resolder F100 No Check & Resolder C116,C119,C121 And PMU Part Resolder U106 END 9-20 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
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SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-20
9-12. GSM Receiver
Check ANT Switch
control circuit
Resolder F100
Check & Resolder
C116,C119,C121
And PMU Part
Resolder U106
RX ON
RF input : CH center freq : +67.7kHz
Cell Power : -60dBm
Yes
F100 Pin11
≥ -65dBm
No
Resolder RFS100,C103,L100
Yes
F100 3,4
≥ -68dBm
Check F100
pin10,pin14 = L
No
No
Yes
Yes
No
Resolder C104, C105, L105
U106
pin 24 ≥ -70dBm
pin 25 ≥ -70dBm
Yes
No
U106pin 16,17,29
32,36 ≥2.8V
pin10≥1.8V
U106 pin 4,5,6,7
≥ 0.2Vp_p
No
Yes
Yes
Check U200
END