Gsm850 Transmitter - Samsung SGH-G600 Service Manual

Flow Chart of Troubleshooting

9-15. GSM850 Transmitter

TX ON (5Level)
Yes
F100 Pin11
≥ 30dBm
No
F100 pin17
≥ 30dBm
No
U100 pin12
≥ 30dBm
No
U100 pin7
≥ -4dBm
No
U102 pin 4,5,6,7
≥ 0.2Vp_p
No
Check UCP200
END
Yes
Resolder CN100,C102,L109
Yes
Yes
Resolder or Change C120,
Yes
Yes
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Check F100
pin14 = H (2.6V),
Pin10 = L
Yes
C121, L114
Yes
Check U100 pin
2,3,5,6,8, +Vbatt
pin4OK?
No
U102pin 11,12,16,
29,32,33,36 ≥2.8V
pin10≥1.8V
Yes
9-22
No
Check ANT Switch
control circuit
Change or Resolder F100
Resolder or Change U100
Check VBAT or PAM
control signal
No
Check U102,
C122,C126,C128
Resolder U102