LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.10 Key sense trouble
Key Sense sequence of KS10 is :
Default condition ROW(0-3) is 2.7V
→
Press the key
→
Corresponding ROW(x) and COL(x) go to
0V
→
Key sensing by key coder IC (U404)
→
Key coder IC send the key information to CPU by I2C
interface
Check Metal
DOME SHEET
Sub & Main
board
Check the RA400 with no key press
Change the Main board
Yes
NO
Change the side key
Check the RA400 with key press
ROW(0-4) is 2.7V?
Check RA400
NO
Yes
ROW(0-4),
COL(0-4) is 0V?
Work well?
End
NO
START
Check R414, 415, C418,TP407,TP406
NO
YES
NO
Change FPCB
Work well?
NO
Change Sub board
Work well?
Work well?
NO
YES
YES
YES
NO
Dome sheet
Side Key
Содержание KS10
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