Rgb Led Trouble - LG KC560 Service Manual

5. TROUBLE SHOOTING

5.12 RGB LED trouble

Check Points
-Signal path is connected well
LCD PWM BACKLIGH T
C508
1u
B1
AUDIO_I N AUDIO_I N
D2
RGB1_ 1 RGB 1
E2
RGB1_ 2 RGB 2
C2
RGB1_ 3 RGB 3
C1
RGB2_ 1 CURR41
E1
RGB2_ 2 CURR42
D1
RGB2_ 3 CURR43
C513
1V8_ CAM
1u
E6
V2_5
A2
VANA_GP I
C507
A1
2.2u
PH OT O_ADC_I N GPIO
TP1
LD500
MLED
LD501
LD502
START
Check All of LEDs solder
Check TP1 is
hlgh (5.5V)?
Yes
Check TP2 is
high?(5.5v)
Yes
Assemble
LGE Internal Use Only
VB AT
B5
DCDC_G ATE
C6
DCDC_SNS
D6
DCDC_FB
C509
C4
VB AT 1u
B4
C2_P
A3
C2_N
A4 C510 1u
C1_P
B3
C1_N
U501 B2 C511 1u
VSS_C P
AS3675 A5
CP_OUT MLED
C5
CURR30 MLED1
D4
CURR31 MLED2 C512
E3
CURR32 MLED3 1u
D3
CURR33 MLED4
E5
CURR1 MLED5
D5
CURR2 MULTIK EY_BL 1
E4
CURR6 MULTIK EY_BL 2
B6 R509 0
CLK SCL
TP1
A6 R510 0
DATA SDA
RGB1_ 3
RGB1_ 2
R511 0
RGB1_ 1
RGB2_ 3
RGB2_ 2
R512 0
RGB2_ 1
No
Check and Replace
charge pump.
No
Check and Replace
charge pump.
C500
1u
B1
AUDIO_I N AUDIO_I N
D2
RGB3_ 1 RGB 1
E2
RGB3_ 2 RGB 2
C2
RGB3_ 3 RGB 3
C1
RGB4_ 1 CURR41
E1
RGB4_ 2 CURR42
D1
RGB4_ 3 CURR43
C506
1u
E6
V2_5
A2
VANA_GP I
A1
GPIO
LD502
RGB_MLE D
LD503
TP2
LD504
LD506
(U501)
(U500)
- 80 - Copyright © 2008 LG Electronics. Inc. All right reserved.
VB AT
B5
DCDC_G ATE
C6
DCDC_SNS
D6
DCDC_FB
C502
C4
1u
VB AT
B4
C2_P
A3
C2_N
C503 1u
A4
C1_P
B3
C1_N
U500 B2 C504 1u
VSS_C P
AS3675 A5
CP_OUT
C5
CURR30 RGB5_ 1
D4
CURR31 RGB5_ 2 C505
E3
CURR32 RGB5_ 3 1u
D3
CURR33
E5
CURR1 RGB6_ 1
D5
CURR2 RGB6_ 2
TP2
E4
CURR6 RGB6_ 3
B6 R506 0
CLK CIF_SCL
A6 R507 0
DATA CIF_SDA
R513 0
R514 0
R515 0
R516 0
TP1
U500 U501
TP2
Only for training and service purposes
RGB_MLE D
RGB3_ 3
RGB3_ 2
RGB3_ 1
RGB4_ 3
RGB4_ 2
RGB4_ 1
RGB5_ 3
RGB5_ 2
RGB5_ 1
RGB6_ 3
RGB6_ 2
RGB6_ 1