LG GD580 Service Manual page 124

Step 2
Check VBATI (TP3,TP4,TP5)
in GSM PAM Block
to Check if main power
source input or not
Check Point (TP1)
in Power Source Block
To Check Power source
Check (TP1&TP3,TP4,TP5)
in Block
to check inner line connection
From TP1 to TP3,TP4,TP5
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Only for training and service purposes
No
3.7V
OK?
Yes
Proceed to the Step 3
3.7V
OK?
Yes
Short?
Yes
Soldering Check Component
(CN300)
In Power Source Block
- 125 -
4. Trouble Shooting
No
Check the Power Supply
No
Change Board
LGE Internal Use Only