Samsung SGH E590 Service Manual - Page 67

PCS Transmitter

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Flow Chart of Troubleshooting 9-18. PCS Transmitter TX ON (0Level) Yes F100 Pin13 ≥ 25dBm No F100 pin8 ≥ 25dBm No U100 pin20 ≥ 25dBm No U100 pin6 ≤ -4dBm Yes U101 pin 4,5,6,7 ≥ 0.2Vp_p Yes Check U200 END Yes Resolder CN100,C101,L104 Yes Check F100 pin9 = H (2.6V), pin11 = L Yes Yes Resolder or Change C117, C118, C120 No Check ANT Switch control circuit Change or Resolder F100 No Check U100pin Yes 4,5,8,14 +Vbatt Resolder or Change U100 pin2,3,15,16 OK? No Check +VBAT or PAM control signal No U101pin11,12,16,17, 29,32,33,36≥2.8V pin 10≥1.8V No Check & Resolder C121,C124,C126 And PMU Part Yes Resolder U101 9-30 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization

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SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-30
9-18. PCS Transmitter
F100 Pin13
≥ 25dBm
Resolder CN100,C101,L104
TX ON (0Level)
Check F100
pin9 = H (2.6V),
pin11 = L
F100 pin8
≥ 25dBm
U100 pin20
≥ 25dBm
U100 pin6
≤ -4dBm
Change or Resolder F100
Check ANT Switch
control circuit
Resolder or Change
C117, C118, C120
Yes
Check U100pin
4,5,8,14 +Vbatt
pin2,3,15,16 OK?
Resolder or Change U100
Check +VBAT or PAM
control signal
No
No
No
Yes
Yes
No
Yes
Yes
Yes
Yes
No
No
No
Yes
END
Check U200
Resolder U101
Yes
U101 pin 4,5,6,7
≥ 0.2Vp_p
U101pin11,12,16,17,
29,32,33,36≥2.8V
pin 10≥1.8V
No
Check & Resolder
C121,C124,C126
And PMU Part