LG VX5400 Service Manual page 74
Tri band, quad mode [pcs/gps/cellular/amps] cdma mobile phone
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Also See for VX5400:
- User manual (99 pages) ,
- Quick reference manual (49 pages) ,
- Quick start manual (6 pages)
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Check if there is any major difference referring
Check pin3 at U109(PA_R1 signal)
LGE Internal Use Only
Start
Check pin2, 7 at U109
To Figure 4.2.1.(i) . Is it similar?
YES
Check pin 1,8 at U109 (Vcc)
whether it is higher than 3.4V.
YES
whether it is lower than 2.2V.
YES
Replace U109
Checking Flow
Checking Flow
YES
NO
NO
Waveform
Waveform
Figure 4.2.1(i)
Copyright@2007 LG Electronics. Inc. All right reserved.
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PAM circuit is OK. See next page
Check Vcc line
Check PA_R1 line
Only for training and serving purposes
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