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4.13 KEY backlight Trouble
TEST POINT
Check Points
-Control IC is working properly
-Passive Parts soldering Status
WAVE FROM
KEY_BACKLIGHT
OFF
CIRCUIT
C218
1u
KEY_BACKLIGHT
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
KEY_BACKLIGHT
ON
VBAT
R215
R216
R217
R218
100ohm
100ohm
100ohm
100ohm
R229
10K
R231
100K
TP1
R219
R220
R221
R222
100ohm
100ohm
100ohm
100ohm
3
Q200
2
2SC5585
1
TP1
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4. TROUBLE SHOOTING
Q200
R231
R229
R223
R224
C219
100ohm
100ohm
1u
LGE Internal Use Only
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Table of Contents
Troubleshooting
