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Flow Chart of Troubleshooting
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9-23
9-15. DCS Transmitter
U106pin16,17,29,
32,36 ≥2.8V
pin 10≥1.8V
Yes
Resolder U106
Check U200
END
No
Yes
No
No
No
Yes
Yes
Yes
Yes
No
Yes
Yes
No
No
No
Check & Resolder
C116,C119,C121
And PMU Part
Check +VBAT or PAM
control signal
Resolder or Change PAM100
Check PAM100pin
4,5,8,14 +Vbatt
pin2,3,15,16 OK?
Yes
U106 pin 4,5,6,7
≥ 0.2Vp_p
Resolder or Change
C114, U104
Check ANT Switch
control circuit
Change or Resolder F100
PAM100 pin6
≤ -4dBm
PAM100 pin20
≥ 25dBm
F100 pin15
≥ 25dBm
Check F100
pin10 = H (2.6V),
pin14 = L
TX ON (0Level)
Resolder RFS100,C103,L100
F100 Pin11
≥ 25dBm
Summary of Contents for SGH D900i - Ultra Edition 12.9 Cell Phone 60 MB
Page 36: ...8 PCB Diagrams 8 1 Top ...
Page 37: ...PCB Diagrams 8 2 Bottom ...