Samsung SGH-E630 - GSM Transmitter

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SGH-E630 Flow Chart of Troubleshooting
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7-18
13. GSM Transmitter
U205 Pin11
>= 20dBm
Resolder CN201, C202
TX ON (5Level)
Check U205
pin11 = H (2.68V),
pin12 = L
pin9=L
U205 pin8
>= 20dBm
U201 pin12
>= 20dBm
osc401 pin1
>= -8dBm
U201 pin6
>= -11dBm
Change or Resolder U205
Check ANT Switch
control circuit
Resolder C203
Resolder R204
U100 pin6, 7, 8, 9
>= 500mV
Yes
Check U201
+VBATT, C212,
R204 OK?
Resolder or Change U201
Check +VBATT or PAM
control signal
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
END
Check U1102
Resolder U100
or Check pins related to U100