Gsm850 Transmitter - Samsung GT-i5700 Service Manual

9-12. GSM850 Transmitter

TX ON (5Level)
Yes
F100 Pin2
>= 20dBm
Yes
F100 pin11
>= 20 dBm
Yes
PAM100 pin9
>= 20 dBm
Yes
1.5dBm >=
PAM100 pin8
> = 5.5dBm
Yes
U100 pin 1,3,23
>= 1V
Yes
Check UCP300
END
No
Resolder RFS100,C100
No
No
Resolder C109, C110
or Change PAM100
No
No
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Check F100
pin3 = H, pin4 = L
,pin5 = L, pin6 = L
Yes
Yes
Check PAM100
and VBAT(pin4) OK?
No
No
Check all voltage
sources of U100
Is it OK?
Yes
9-31
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
Change or Resolder
F100
Resolder or Change PAM100
Check VBAT or PAM
control signal
Check & Resolder
CP PMIC(U401)
Resolder U100