LG KG270 Service Manual - Page 63
Key backlight Trouble
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4. TROUBLE SHOOTING 4.8. Key backlight Trouble TEST POINT Q200.PIN3 R204 R203 Q200.PIN2 D203 D20 4 D205 CIRCUIT DIAGRAM VBAT KEY BACKLIGHT D200 D201 D202 1u 100ohm R221 100ohm R220 100ohm R219 R218 100ohm R217 100ohm R216 100ohm C222 1u C223 LD205 LEBB-S14H LD204 LEBB-S14H LD203 LEBB-S14H LD202 LEBB-S14H LD201 LEBB-S14H LD200 LEBB-S14H (10V,K,X5R) KEY_BACKLIGHT R222 1K R223 10K 2SC5585 Q200 - 64 - (10V,K,X5R)
4.8. Key backlight Trouble
4. TROUBLE SHOOTING
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D203
D200
D204
D201
D205
D202
R203
R204
Q200.PIN2
Q200.PIN3
TEST POINT
CIRCUIT DIAGRAM
KEY BACKLIGHT
(10V,K,X5R)
(10V,K,X5R)
LD201
VBAT
LEBB-S14H
LEBB-S14H
LD200
2SC5585
Q200
LEBB-S14H
LD204
1u
C223
LD202
LEBB-S14H
100ohm
R220
LD203
LEBB-S14H
R219
100ohm
100ohm
R218
R223
10K
100ohm
R216
1K
R222
LD205
LEBB-S14H
1u
C222
R217
100ohm
R221
100ohm
KEY_BACKLIGHT