LG KE990 Service Manual - Page 101
Keypad backlight trouble
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4. TROUBLE SHOOTING 4.9 Keypad backlight trouble Key Pad Back Light is on as below : Key pressing → PM6635 KYPD_LED_EN go to Low → LED On (Key Pad LED controlled by PM6635) Start Key press +VPWR is OK? NO Check de vice sh ort : LD700~705 and R711~716 (Main) Yes Signal KY PD_LED_EN is Lo w? NO Chang e th e main bo ard Yes Som e LED is not work? NO Yes Check de vice open : LD700~705 and R711~716 (Main) Work w ell? NO Chang e th e main bo ard Yes End R711~716 (Main) VA708 (KYPD_LED_EN) LD703 (+VPWR) LGE Internal Use Only LD700~705 (Main) - 102 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 102 -
4.9 Keypad backlight trouble
Key Pad Back Light is on as below :
Key pressing
→
PM6635 KYPD_LED_EN go to Low
→
LED On (Key Pad LED controlled by
PM6635)
Start
Check
device short :
LD700~705 and R711~716 (Main)
NO
Yes
Key press
Signal KY PD_LED_EN
is Lo w?
+VPWR i
s OK?
Chang e th e main bo ard
NO
Yes
Yes
Check
device open :
LD700~705 and R711~716 (Main)
NO
Some LED
is not wo
rk?
Work w ell?
Yes
Chang e th e main bo ard
NO
En
d
LD700~705 (Main)
LD703 (+VPWR)
VA708 (KYPD_LED_EN)
R711~716 (Main)