Samsung SGH-E800 Service Manual page 47

12. GSM Receiver
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Yes
U100 Pin7
>= -65dBm
Yes
U100 pin5
>= -65dBm
Yes
F101 pin1
>= -67dBm
Yes
U102
pin32 >= -70dBm
pin33 >= -70dBm
Yes
U102 pin6, 7, 8, 9
>= 1V
Yes
R126, R128, R129,
R130 >= 1V
Yes
Check U205
END
No
No
No
Resolder F101, C105, L107
No
Resolder L104, L105, L106
No
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Resolder CN100, C104
Check U100
pin4 = L, pin8 = L
Yes
Check U102
pin4, 10, 22 >=2.7V
Yes
7-23
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
Resolder U100
No
Check & Resolder
U102, R103, R104
RF13MHz, RF PSU Part
Resolder U102