Tx Trouble - LG G7100 Service Manual

4.3 TX Trouble

④
⑤
①
②
⑥
③
Test Points
Figure 4-9a
Figure 4-9b
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4. TROUBLE SHOOTING
Checking Flow
START
HP8922 : Test mode (PCS band)
62 CH, 7 level setting (TCH)
62 CH, -60dBm setting (BCCH)
Spectrum analyzer setting
Oscilloscope setting
1. Check
Regulator Circuit
2. Check
VCTCXO Circuit
3. Check
PLL Control Signal
4. Check
Ant SW &
Mobile SW
5. Check
PAM control
Signal
6. Check
TX IQ
Redownload SW, CAL