LG VX5400, Service Manual

Page: 55 / 171

Checking Flow
Checking Flow
Check pin2 at U100
Check if there is any major difference referring
To Figure 4.1.2 (e). Is any signal detected at
that point?
Start
Replace U100
RF signal path is OK. See next page to Rx I/Q data signal
NO
Check pin1 at U100
Check if there is any major difference referring
To Figure 4.1.2 (e e) Is any signal detected at
that point?
YES
Check L100, C101
NO
Check pin3 at U101
Check if there is any major difference referring
To Figure 4.1.2 (f ). Is any signal detected at
that point?
YES
Replace U101
NO
YES
-55-
Copyright@2007 LG Electronics. Inc. All right reserved.
Only for training and serving purposes
LGE Internal Use Only
Z3X-BOX.COM