Checking Vcxo Block - LG KT520 Service Manual

4.16 Checking VCXO Block

The reference frequency (26MHz) from U103(GSM Transceiver RF3000) is used WCDMA TX part and
BB part. Therefore, 3 test points in the following figure should be checked.
Oscilloscope
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Only for training and service purposes
Digital Base Band
U103
X101
GSM
Crystal
Transceiver
(RF3000)
Main board : bottom side
Connection for Checking VCXO Block
- 127 -
4. TROUBLE SHOOTING
U301
(DB3100)
U204
WCDMA
Transceiver
(RF3100)
Notebook to send
TP command
Phone
LGE Internal Use Only