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5. Trouble shooting
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Fig 6 Waveform of DCXO
START
Check soldering
of components of
U400
Assemble
Resolder the
com
ponent
Yes
No
No
Check the Dome switch
contacts are
clear
Check the voltage
of TP1~4.
Volta
g
e is 2.6V?
Resolder or Replace
U400
Dome
switch
TP3
TP1
TP2
TP4