Key Back-Light Illumination - LG C3400 Service Manual

3. TECHNICAL BRIEF

3.15 Key Back-light Illumination

In key back-light illumination, there are 12 Blue LEDs in Main Board, which are driven by
KEY_BACKLIGHT signal from AD6527B.
Keybacklight
On/Off control
Signal
R362 10
R363 10
6 5 4
1 2 3
C341 27p
R360 10
R361 10
Figure 3-31. KEY BACK-LIGHT ILLUMINTION
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C322 1u
C323 1u
C310 1u
C311 1u
C313 1u
LD300
R332
LEBB-S14H
47
LD303
R335
LEBB-S14H
47
LD304
R336
LEBB-S14H
47
LD305
R337
LEBB-S14H
47
LD306
R338
LEBB-S14H
47
LD307
LEBB-S14H
R339 47
LD308
LEBB-S14H
R340 47
LD309
LEBB-S14H
R341 47
LD310
LEBB-S14H
R342 47
LD311
LEBB-S14H
R343 47
LD312
LEBB-S14H
R344 47
LD313
LEBB-S14H
R345 47
C315
1u
C316
1u
C317
1u
C318
1u
C319
1u
C320
1u
C321
1u