Egsm Receiver - Samsung SGH-i700 Service Manual

SGH-I700 Flow Chart of Troubleshooting

11. EGSM Receiver

CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -50dBm
NORMAL CONDITION
catch the channel?
F1001 CHECK
pin15 ≥ -65dBm ?
F1001 CHECK
pin1, 2 ≥ -65dBm ?
U1002 CHECK
pin21,22 ≥ -65dBm ?
U1002
pin 12,13≥
-20dBm ?
YES
U1002 CHECK
pin 14,23,26,32:
clean 2.8V?
YES
U1002 pin3,4
Vp-p : 240mV?
YES
U1002 pin1, 2
Vp-p : 250mV ?
YES
U1001 pin2,3,4,5
Vp-p: 100mV ?
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
U1003 CHECK
pin5,25,28 : 3V ?
YES
U1003 CHECK
pin 7 : 13MHz ?
Vp-p : 860mV?
YES
U1003 change or
resolder
NO
U701 pin39, C724
check or resolder
NO
U1001 CHECK
pin6, 20 : 2.8V ?
resolder or change
NO
resolder or change
NO
CHECK
U901
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Check soldered status of
L1006, L1002
CN703
resolder or change
F1001
resolder or change
C1016 .C1017 ,L1003
resolder or change
NO
U701 pin33, C724
check or resolder
NO
OSC901 CHECK
pin 3 : 13MHz ?
Vp-p : 950mV?
YES
C921 , R907
resolder
NO
YES
U1001
U1002
2-16
NO
NO
OSC901 CHECK
pin 4 : clean
3V ?
YES
OSC901 change or
resolder
U701 pin33, C724
check or resolder