Samsung SGH-X461, Service Manual

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SGH-X461 Flow Chart of Troubleshooting
2-19
2-2-4. GSM Tx
Check U801
pin 15 : about
2~3 dbm?
Check U801
pin 6 : 2.8V ?
Check and
change
CON900 , C110
Yes
Check and
change
U600 , U100
No
CONTINUS TX ON CONDITION
TX POWER DAC : 554 CODE
APPLIED
CH : 62ch
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV : 10dBm
ATT : 20dB
U102 pin 11 :
about 4~5dbm?
Yes
No
Yes
U102 pin 17 :
3.7V ?
U801
check & change
No
Battery, U100
check & change
Yes
U102 pin 18 :
1.2V ?
No
U100 check
Yes
U102 pin 6 :
3V ?
No
U100 check
U801 pin 12,13,
28,29 : 2.8V ?
U102
change or resolder
U100
change or resolder
No
Yes
U801
change or resolder
Yes
U102 pin 12
:
about -5dbm?
No
Yes
No
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