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4. TROUBLE SHOOTING
CIRCUIT DIAGRAM
KEY_BACKLIGHT
LOW
HIGH
Checking Flow
START
EL sheet is teared?
YES
Replace EL sheet
EL sheet will work properly.
EL DRIVER IC
R701
68K
C731
C704
EL OFF
NA
68p
EL ON
NO
VBAT
U700
D381B
1
8
CHF
V+
2
7
CLF
L+
3
6
E
VOUT
4
5
GND
L-
C705
ZD700
6800p
KDZ100VW
NO
R701 is well-soldered?
YES
NO
Voltage of R701 is high?
YES
Replace U700
- 90 -
C703
1u
EL_OUT
L700
820uH
C750
2200p
1608
R750
33
2012 1/4W
Resolder R701
Replace U103
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