Checking Vcxo Block - LG GD580 Service Manual

4. Trouble Shooting

4.15 Checking VCXO Block

The reference frequency (26MHz) from U102(Transceiver RF3000) is used
WCDMA TX part and BB part, Bluetooth part. Therefore, 3 test points in the following figure
should be checked.
Digital Base Band
Oscilloscope
LGE Internal Use Only
DB3150
U302
Main board : Top side
Connection for Checking VCXO Block
Notebook to send
TP command
Phone
- 128 - Copyright © 2009 LG Electronics. Inc. All right reserved.
RF3000
U102
Transceiver
X100
Crystal
Only for training and service purposes