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SGH-S410i Flow Chart of Troubleshooting
2-
15
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2-2.RF
2-2-1. EGSM RX
Continuous RX ON
RF Input : 62 CH
AMP : -50dBm
NORMAL CONDITION
Catch the channel ?
YES
NO
U106 Check
Pin #9
≥
-65dBm ?
U106 Check
Pin #11
≥
-65dBm ?
U103 Check
Pin#20,21
≥
-65dBm ?
Check soldered status of
L114,L115,C145,L116,C109
C108,L118,V101
Resolder or Change
U106 Resolder or Change
U103 Check
Pin#9,32=Clean 2.9V?
U103 Check
Pin#28,1,2,3=100mV?
U401,C418,100,130
Check or resolder
Check U401
NO
NO
YES
YES
YES
YES
NO
YES
U103 Check
Pin #8 : 13MHz ?
Vpp : 860mV?
OSC101 Check
Pin #3 : 13MHz ?
Vpp : 950mV?
OSC101 Check
Pin #4 = 2.8V ?
U103
Change or resolder
NO
NO
NO
R112,C132
resolder
OSC101
Change or resolder
YES
YES
YES
NO
Check soldered status of
C120,121,L108,F103
F103 Check
Pin #1
≥
-65dBm ?
Check soldered status of
L113,V102,L120
Resolder or Change
NO
YES
NO