- 92 -
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
Multikey
EL sheet operating voltage generator
(
L900, D901, Q900, C903, R910 or R913)
⑤
TP17_BB
Check the output of C903
Output must be 190V AC about 800KHz
⑥
Replace U900
10M
R910
470pF
C903
D1 D2 D3 D4 D5
G
S1 S2
Q900
SIA450DJ
C905
150p
R913
100K
TOUCH_3.1V
C906
0.1u
RF051VA2S
D901
VREG_6.1V
2.2u
C902
33
SL
100uH
L900
100K
R912