Check pin2, 7 at U108
Check if there is any major difference referring
To Figure 4.2.2.(h)
. Is it similar?
Start
PAM circuit is OK. See next page
YES
Replace U108
YES
Check pin 1,8 at U108 (Vcc)
whether it is higher than 3.4V.
Check Vcc line
NO
YES
Check pin3 at U108(PA_R1 signal)
whether it is lower than 2.2V.
Check PA_R1 line
NO
YES
Waveform
Waveform
Figure 4.2.2(h)
-89-
Copyright@2007 LG Electronics. Inc. All right reserved.
Only for training and serving purposes
LGE Internal Use Only
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Содержание VX5400
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