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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Summary of Contents for VX5400
Page 132: ...1 Assembly and Disassembly Diagram 132 Internal Use Only Z 3 X B O X C O M ...
Page 133: ...Z 3 X B O X C O M Internal Use Only ...
Page 134: ...Z 3 X B O X C O M Internal Use Only ...
Page 135: ...2 Block and Circuit Diagram 135 Internal Use Only Z 3 X B O X C O M ...
Page 136: ... 136 Internal Use Only Z 3 X B O X C O M ...
Page 138: ...Z 3 X B O X C O M CDMA ant DCN Tx DCN Rx PCS Tx PCS Rx GPS Internal Use Only 138 ...
Page 139: ...Z 3 X B O X C O M Internal Use Only 139 ...
Page 140: ...Z 3 X B O X C O M Internal Use Only 140 ...
Page 141: ...Z 3 X B O X C O M Internal Use Only 141 ...
Page 142: ...Z 3 X B O X C O M Internal Use Only 142 ...
Page 143: ...Z 3 X B O X C O M Internal Use Only 143 ...
Page 144: ... 144 Z 3 X B O X C O M ...
Page 145: ... 145 Z 3 X B O X C O M ...
Page 146: ... 146 Z 3 X B O X C O M ...
Page 147: ...3 Part List 147 Internal Use Only Z 3 X B O X C O M ...
Page 160: ...4 Components Layout 160 Z 3 X B O X C O M ...
Page 163: ... 163 Z 3 X B O X C O M ...
Page 164: ... 164 Z 3 X B O X C O M ...
Page 165: ... 165 Z 3 X B O X C O M ...
Page 166: ... 166 Z 3 X B O X C O M ...
Page 167: ... 167 Z 3 X B O X C O M ...
Page 168: ... 168 Z 3 X B O X C O M ...
Page 169: ...5 BGA Pin MAP 169 Z 3 X B O X C O M ...
Page 170: ...1 U300 MSM6100 90NM EUSY0152202 USED NOT USED 170 Z 3 X B O X C O M ...
Page 171: ...2 U300 HYC0SEE0MF1P 6SH0E EUSY0322101 USED NOT USED NC 171 Z 3 X B O X C O M ...