Gsm850 Transmitter - Samsung SGH-T619 Service Manual

Flow Chart of Troubleshooting

9-13. GSM850 Transmitter

TX ON (5Level)
Yes
F101 Pin10
>= 20dBm
No
F101 pin17
>= 18dBm
No
PAM100 pin10
>= 18dBm
No
PAM100 pin9
<= -11dBm
No
U102 pin38
<= -15dBm
No
U102 pin 6,7,8,9
>= 1V
No
Check UCP200
END
Yes
Resolder RFS100,C101,L141
Yes
Yes
Resolder C131,L111,C141
Yes
Yes
Resolder C130,L116,L114,
Yes
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Check F101
pin13 = H (2.68V)
pin11,15,16 = L
No
Yes
Check PAM100
pin 3,4,5,6,7 OK?
No
C134,C132,L112
Check U102
pin23, 26, 31
>=2.7V
No
9-24
Yes
Change or Resolder F101
Check ANT Switch
control circuit
Resolder or Change PAM100
Check +VBAT or PAM
control signal
Yes
Resolder U102
Check & Resolder RFLO
signal, RF26MHz,
RF PSU Part