Checking Vcxo Block - LG TU750 Service Manual

4.17 Checking VCXO Block

The reference frequency (26MHz) from U110 (GSM/WCDMA Transceiver RF3300) on Main
board can be measured by using Oscilloscope and performing TP command in computer.
Oscilloscope
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
U110
GSM/WCDMA
Transceiver
(RF3300)
Figure 4-7. VCXO block
Figure 4-8. Connection for Checking VCXO Block
- 137 -
X101
Crystal
Notebook to send
TP command
Phone
4. TROUBLE SHOOTING
LGE Internal Use Only