Pcb Layout - LG U990 Service Manual

9. PCB LAYOUT

<LDO IC>
- 1.0V, 1.2V power supply
<Baseband and RF IC>
- Check the battery voltage and
Outputs of LDOs-Rx operation
<Xtal>
- Check the frequency (27MHz)
<Multi media IC>
- Camcorder, Camera operation
<RF IC>
- GSM, WCDMA TX/RX operation
<UMTS RX SAW filter>
- WCDMA RX operation
<RF SW>
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Only for training and service purposes
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<Audio Codec>
- Headset, speaker operation
<PM IC>- Power management
<Charging IC>
- Check the TA and bettery
<Memory IC>- Check S/W
download
<Xtal>- Check the frequency
(19.2MHz)
<GSM900 TX SAW filter>
- GSM900 TX operation
<UMTS Duplexer>
- WCDMA RX,TX separation
<GSM PAM>- GSM TX
amplifier operation
<FEM>- RX, TX
switching selection
LGE Internal Use Only