Samsung SGH-E340 - Advanced RF and Display Troubleshooting

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Flow Chart of Troubleshooting
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7-21
7-12. GSM Receiver
MODULE1 Pin7
>= -65dBm
Resolder CN101, C101
END
No
Yes
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Check MODULE1
pin9,pin10,pin12 = L
U100 pin1,2
>= -68dBm
U100 pin
H8,J8,H7,J7
>= 1V
U100
pin E1 >= -70dBm
pin F1 >= -70dBm
Check ANT Switch
control circuit
Resolder MODULE1
Resolder C144, C115, L112
R135, C157, C123
>=2.7V
Check & Resolder
U100, R111
RF26MHz, RF PSU Part
Resolder U100
Yes
Yes
Yes
Yes Yes
Yes
No
No
No
No
No
Check U200