Samsung SGH-E770 - DCS Receive Path Diagnostics

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SGH-E770 Flow Chart of Troubleshooting
2-18
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2-2-2. DCS RX
Continuous RX ON
RF Input : 660 CH
AMP : -50dBm
NORMAL CONDITION
Catch the channel ?
YES
NO
F100 Check
Pin #6
≥
-65dBm ?
F100 Check
Pin #13
≥
-65dBm ?
UCD100 Check
Pin#43
≥
-65dBm ?
Check soldered status of
R125, 11, C12, 153, L108, 106
PAM101, C10
Resolder or Change
F100 Resolder or Change
UCD100 Check
Pin#15,16,23,27,31
=Clean 2.8V?
UCD100 Check
Pin#28,29,30,54=100mV?
C17, 18, 114, 152, UCP301
Check or resolder
Check UCP301
NO
NO
YES
YES
YES
YES
NO
YES
UCD100 Check
Pin #17 : 13MHz ?
Vpp : 1.1V?
R118 = 13MHz ?
Vpp : 1.2V?
R116 = 1.5V ?
UCD100
Change or resolder
NO
NO
NO
C141, R118
resolder
TCX101
Change or resolder
YES
YES YES
NO
Check soldered status of
L104, C123
NO