Samsung GT-S5230 - GSM850;900 Transmitter

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Flow Chart of Troubleshooting
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9-21
9-14.
GSM
850/900
Transmitter
①
②
④
Check VBAT or PAM
control signal
No
Change or Resolder
U100
Yes
U100
Pin
17
≥
-65
dBm
TX ON
(5
Level)
Check
U100
pin
10 = H (2.6
V),
Pin1
6=L
U100 pin
13
≥
-30
dBm
PAM100 pin
5
≥
-4
dBm
Check ANT Switch
control circuit
Yes
Check PAM100 pin
1,2,3,20, V
BAT OK?
Yes
Yes
Yes
Yes
No
No
No
No
Yes
Resolder U100
,
L105, C116
PAM100 pin1
3
≥
-30
dBm
③
No
Resolder or Change C117, C119,
C118
Resolder or Change PAM100
Check UCP200
END