Samsung SGH E590 Service Manual - Page 63

GSM Transmitter

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Flow Chart of Troubleshooting 9-14. GSM Transmitter TX ON (5Level) Yes F100 Pin13 ≥ 30dBm No F100 pin10 ≥ 30dBm No U100 pin18 ≥ 30dBm No U100 pin12 ≥ -4dBm No U101 pin 4,5,6,7 ≥ 0.2Vp_p No Check U200 END Yes Resolder CN100,C101,L104 Yes Check F100 pin11 = H (2.6V), Pin9 = L Yes Yes Resolder or Change C113, C116, L107 No Check ANT Switch control circuit Change or Resolder F100 Yes Check U100pin 4,5, Yes 8,14 +Vbatt pin2,3, Resolder or Change U100 15,16 OK? No Check VBAT or PAM control signal Yes U101pin 11,12,16,17,29 No 32,33,36 ≥2.8V Check U101, pin10≥1.8V C121,C124,C126 Yes Resolder U101 9-26 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
9-26
9-14. GSM Transmitter
U101pin
11,12,16,17,29
32,33,36 ≥2.8V
pin10≥1.8V
END
Check U200
Yes
Resolder U101
Check VBAT or PAM
control signal
No
Change or Resolder F100
Yes
F100 Pin13
≥ 30dBm
Resolder CN100,C101,L104
TX ON (5Level)
Check F100
pin11 = H (2.6V),
Pin9 = L
F100 pin10
≥ 30dBm
U100 pin18
≥ 30dBm
U100 pin12
≥ -4dBm
Check ANT Switch
control circuit
Resolder or Change C113,
C116, L107
U101 pin 4,5,6,7
≥ 0.2Vp_p
Yes
Check U100pin 4,5,
8,14 +Vbatt pin2,3,
15,16 OK?
Resolder or Change U100
Check U101,
C121,C124,C126
No
No
No
No
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No