Samsung SGH-X461, Service Manual

Page: 15 / 48

SGH-X461 Flow Chart of Troubleshooting
2-12
2-2. RF
2-2-1. GSM Rx
Normal condition
catch the
channel ?
Check U102
pin 12 ≥ -65
dbm ?
Check U801
pin 21,22 ≥ -
65dBm ?
Yes
No
No
Check U102
pin 16 ≥ -65
dbm ?
Yes
No
Yes
Check ANT, R101,R102,U909,L103
Resolder or change
CON900, L903, C902, C901, C903, L904
Resolder or change
U102
Resolder or change
F900
Resolder or change
U600
CONTINOUS RX ON
RF INPUT : 62CH
AMP : -50dbm
Check U101
pin 13 = 2.8V
Yes
Resolder or change
U100
Yes
No
No
1
2
3
4
5