LG -E455 Service Manual page 68

4.2.1.3 Checking B1 TX PA
Check TP1(L173) at U103
Check if there is any major difference referring
To Figure 4.2.1.4 Is it similar ?
Check TP2(C163)at U103
Check if there is any major difference referring
To Figure 4.2.1.4 Is it similar ?
Check TP3(C193) at U103 (VPWR)
Whether it is higher than 1.5V
Replace U103
LGE Internal Use Only
START
Yes
No
Yes
No
Check L173, C199
Yes
PAM circuits OK See next page
No
The Problem may be Logic part
Refer to Logic troubleshoot
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4. TROUBLE SHOOTING
Only for training and service purposes