![background image](http://html.mh-extra.com/html/samsung/sgh-e720/sgh-e720_service-manual_1190615017.webp)
SAMSUNG Proprietary-Contents may change without notice
SGH-E720 Flow Chart of Troubleshooting
2-
14
This Document can not be used without Samsung's authorization
2-2-2. DCS RX
Continuous RX ON
RF Input : 660 CH
AMP : -50dBm
NORMAL CONDITION
Catch the channel ?
YES
NO
U106 Check
Pin #9
≥
-65dBm ?
U106 Check
Pin #1
≥
-65dBm ?
U103 Check
Pin#18,19
≥
-65dBm ?
Check soldered status of
R114,115,C152,109,L145
CN100,C108,L103
Resolder or Change
U106 Resolder or Change
U103 Check
Pin#9,32=Clean 2.8V?
U103 Check
Pin#28,1,2,3=100mV?
U401,C418,100,130
Check or resolder
Check U401
NO
NO
YES
YES
YES
YES
NO
YES
U103 Check
Pin #8 : 13MHz ?
Vpp : 860mV?
OSC101 Check
Pin #3 : 13MHz ?
Vpp : 950mV?
OSC101 Check
Pin #4 = 2.8V ?
U103
Change or resolder
NO
NO
NO
R112,C132
resolder
OSC101
Change or resolder
YES
YES
YES
NO
Check soldered status of
C115,119,L105,F102
F102 Check
Pin #1
≥
-65dBm ?
Check soldered status of
C149,148
NO
YES
NO