Samsung SGH-E530 - RF Troubleshooting

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SGH-E530 Flow Chart of Troubleshooting
2-14
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U103 pin#8
≥
-65dBm
2-2.RF
2-1-1. EGSM RX
NORMAL CONDITION
catch the channel?
NO
Check ANT1,C143
ANT2, L101 contact
CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -50dBm
YES
NO
Check C103, CN100
YES
pin#2,3 of
U103
≥
-65dBm
NO
Check U103
YES
pin#20, 21
of U102
≥
65dBm
NO
Check
C106,C109,L103
YES
U102
pin#9, 32 = 2.8V
NO
Check
U401 pin#A13, #C421
YES
U102 CHECK
pin#8 = 13MHz
Vp-p = 950mV
NO
Check OSC100
YES
pin#1,2,3,28 of U102
Vp-p = 120mV ?
NO
Check U102
YES
CHECK U401