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CIRCUIT
VBAT
CHECKING FLOW
at KEY_BL_EN = high ?
Backlight will work properly.
Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
VBAT
R301
R302
R303
R304
R305
R306
270
270
270
270
270
270
TP1
3
2
TP1
Q300
1
C337
R327
100K
1u
START
Is TP1 of Q300 low
YES
Are all LEDs
Working?
YES
4. TROUBLE SHOOTING
R307
R308
R309
R310
R311
270
270
270
270
270
R326
KEY_BL_EN
1K
NO
Check Q300
NO
Check the soldering
each R and LED
NO
Replace or resolder
component
- 99 -
4. TROUBLE SHOOTING
R312
R349
R350
270
270
270
LGE Internal Use Only
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