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4. TROUBLE SHOOTING
TP* ; UMTS 850 RX PATH
TP*’; UMTS 1900 RX PATH
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Set the Phone Rx is ON
Check bias1/
bias1' Over
2V?
Check vias
block solding
Check TP1
Signal exist?
Check
ANT100
Check TP2/TP2'
Signal exist?
Check ANT. SW
Module U100
Check Duplxer
FL106/FL107
Check
RFL6202 and
FL109/FL110
Rx is OK
Check other Parts
Check TP3/TP3'
Signal exist?
Check TP4/TP4'
Signal exist?
Yes
No
No
No
No
No
Summary of Contents for TU550
Page 1: ...Date May 2007 Issue 1 0 Service Manual Model TU550 Service Manual TU550 Internal Use Only ...
Page 185: ...Note ...
Page 186: ...Note ...