LG KT520 Service Manual page 122

4.15.1 Step 1
C213
C103
C104
Main Board (bottom side)
- Step 1 : VBAT Block
Check Point (C618) in
Power Source Block
To Check Power
source to Check if
main power source
input or not
Check Point (CN600)
in Power Source Block
To Check Power source
Check (C617 & CN600)
in Block
to check inner line
connection
From C617 to D601
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Only for training and service purposes
Step 1
3.7V
OK?
Proceed to the Step 2
Soldering Check Component
In Power Source Block
- 123 -
4. TROUBLE SHOOTING
Check point
(C617)
Check point
(CN600)
Main Board (bottom side)
- Power Source Block
No
Yes
No
3.7V
Check the Power Supply
OK?
Yes
No
Short?
Yes
(CN600)
Change Board
LGE Internal Use Only