Samsung SGH-T429 Service Manual - Page 53
GSM Transmitter
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9-13. GSM Transmitter Flow Chart of Troubleshooting TX ON (5Level) Yes F100 Pin13 >= 20dBm Yes F100 pin10 >= 18dBm Yes PAM100 pin11 >= 18dBm Yes PAM100 pin4 =2.8V RF PSU Part Yes Resolder U101 9-21 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
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SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
9-21
9-13. GSM Transmitter
U101
pin12,13,28,29
>=2.8V
Yes
Resolder U101
Check
UCP200
END
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Check & Resolder RFLO
signal, RF13MHz,
RF PSU Part
Check +VBAT or PAM
control signal
Resolder or Change F100
Check Pam100
+VBATT(pin17)
Yes
U101
pin 4,5,6,7
>= 1V
Resolder
R102
Resolder or Change PAM100
or
L109, C110
Change or Resolder
F100
Change or Resolder
L109,C110,L111
PAM100
pin4
<= -11dBm
PAM100
pin4
<=
-15dB
PAM100
pin11
>= 18dBm
F100
pin10
>= 18dBm
Check F100
pin9 = L
pin12 = H(2.6V)
TX ON (5Level)
Resolder
CN100,C104
F100
Pin13
>= 20dBm