LG KM710 Service Manual - Page 95

MAIN KEY Backlight LED Trouble

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4. Trouble Shooting z MAIN KEY Backlight LED Trouble START Is the Voltage level VBAT 3.35 ~4.2? YES Are all LEDs LED700 ~701(Main key) Working? YES Main key is Working? YES Backlight will work properly NO Charge Battery NO Check the soldering of R703, R704 or Replace LEDs not working NO Check the condition of doom sheet. If problem, Replace the doom sheet LGE Internal Use Only - 96 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

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- 96 -
4. Trouble Shooting
z
MAIN KEY Backlight LED Trouble
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
NO
Is the Voltage level VBAT
3.35 ~4.2?
Backlight will work
properl
y
START
YES
Check the soldering of
R703, R704 or Replace
LEDs not workin
g
NO
Are all LEDs
LED700 ~701(Main key)
Working
?
Charge Battery
YE
S
Main key is
Working?
YE
S
Check the condition of
doom sheet. If problem,
Replace the doom
sheet
NO