Gsm Transmitter - Samsung SGH D900i - Ultra Edition 12.9 Cell Phone 60 MB Service Manual

9-13. GSM Transmitter

TX ON (5Level)
Yes
F100 Pin11
≥ 30dBm
No
F100 pin17
≥ 30dBm
No
PAM100 pin18
≥ 30dBm
No
PAM100 pin12
≥ -4dBm
No
U106 pin 4,5,6,7
≥ 0.2Vp_p
No
Check U200
END
Yes
Resolder RFS100,C103,L100
Yes
Yes
Resolder or Change L107
Yes
Yes
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Check F100
pin114 = H (2.6V),
Pin10 = L
Yes
Yes
Check PAM100pin
4,5,8,14 +Vbatt
pin2,3,15,16 OK?
No
U106pin 16,17,29
No
32,36 ≥2.8V
pin10≥1.8V
Yes
9-21
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 U106,
C116,C119,C121
Resolder U106