Samsung SGH-A737 Service Manual page 59

9-2-4. GSM900 Transmitter
**If you check the tx chain,
Check the not only RF Device but also resistor, inductor and capacitor.
Tx ON
(Level : 5)
battery voltage : 3.8V
U104 Check
Pin#44 ≤ 2.65V ?
YES
PAM101 Check
Pin #23 ≒ 6dBm ?
YES
PAM101 Check
Pin #8 ≥ 30dBm ?
YES
RFS100 Check
Pin #3 ≥ 30dBm ?
YES
RFS100 Check
Pin#2 ≥ 30dBm?
YES
THE END
NO
NO
NO
NO
NO
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Check the U104
Check the path from U104 to
PAM101
Replace PAM101
Check the path from PAM101 to
PAM101
Resolder or Change RFS100
9-25
Flow Chart of Troubleshooting