LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 70 -
4.5 Keypad backlight trouble
Key Pad Back Light is on as below :
Key pressing
→
PM6658 KYPD_LED_EN go to Low
→
LED On (Key Pad LED controlled by
PM6658)
start
VPWR is ok?
Check device short
LD400 0, LD400 1
Signal KYBD_BACKLIGHT
is low ?
Change LD 400 0, LD400 1
Work well ?
END
Check the VA 401 1
YES
YES
NO
NO
NO
Change Main Board
YES
100ohm
R4013
R4012
100ohm
VA4011
ICVS0514X350FR
LD4000
SSC-SWTS1007
1
A
2
C
A
1
C
2
SSC-SWTS1007
LD4001
+VPWR
KYBD_BACKLIGHT
+VPWR
Fig. Schematic of keypad backlight part
Z3X-BOX.COM
Summary of Contents for KF310
Page 174: ...Note Z 3 X B O X C O M ...