LG VX5400 Service Manual page 38

Check if there is any major difference referring
Check if there is any major difference referring
SBDT
SBCK
Figure 4.1.1 (c)
LGE Internal Use Only
Checking Flow
Start
Check pin24, 25, 26 at U111
To Figure 4.1.1 (c), (d)
NO
Redownload S/W
Check pin24, 25, 26 at U111
To Figure 4.1.1 (c), (d)
NO
Replace Main B /D
Checking Flow
Control signal is Ok . See next page
YES
Control signal is Ok . See next page
YES
Waveform
Waveform
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to check RF signal path .
to check RF signal path .
SBST
SBCK
Figure 4.1.1 (d)
Only for training and serving purposes