Samsung X200 - SGH Cell Phone Service Manual page 14

2-2. RF
2-2-1. GSM Rx
CONTINOUS RX ON
RF INPUT : 62CH
AMP : -50dbm
Normal condition
catch the
channel ?
Yes
Check U100
pin 12 ≥ -65
dbm ?
Yes
Check U100
pin 16 ≥ -65
dbm ?
Yes
Check U102
pin 21,22 ≥ -
65dBm ?
Yes
Check U102
pin 13 = 2.9V
Yes
Resolder or change
U201
SGH-X200 Flow Chart of Troubleshooting
No
Check ANT,
No
Resolder or change
CN100, C102,L100,L101,L111
No
Resolder or change
No
Resolder or change
F101,C105,C109,L104
No
Resolder or change
2-11
R198,R199,C104,L113
U100
U107
1
2
3
4
5