Gsm850 Transmitter - Samsung GT-S5200 Service Manual

9-12. GSM850 Transmitter

TX ON (5Level)
Yes
F100 Pin11
≥ 30dBm
No
Check F100
pin14=H, pin10=L
Yes
PAM100 pin13
≥ 30dBm
No
Check pam100 pin
1,2,3,17,18,20 OK?
Yes
U100 pin 26,27,28,29
≥ 0.2Vp_p
No
Check UCP200
END
Yes
Resolder RFS100,C106,L101
No
Check control circuit and
Resolder F100
Yes
Resolder C145,C103
No
Resolder or Change PAM100
Check VBAT or PAM control signal
Yes
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U100
pin5,10,11,25,32,34,
36 ≥ 2.8V
pin4 ≥ 1.8V
Yes
9-27
Flow Chart of Troubleshooting
Check & Resolder
No
C132,C123,C122
and PMU Part
Resolder U100