Samsung GT-S5230 Service Manual page 41

9-14. GSM850/900 Transmitter
TX ON (5Level)
Yes
U100 Pin17 ≥
-65dBm
Yes
U100 pin13
≥ -30dBm
Yes
PAM100 pin13
≥ -30dBm
Yes
PAM100 pin5
≥ -4dBm
Yes
Check UCP200
END
①
No
Resolder U100, L105, C116
No
③
No
Resolder or Change C117, C119,
No
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Check U100
pin10 = H (2.6V),
Pin16 = L
Yes
C118
Yes
Check PAM100 pin
1,2,3,20, VBAT OK?
No
9-21
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
②
Change or Resolder U100
④
Resolder or Change PAM100
Check VBAT or PAM
control signal