B/L Power Circuit Diagram - LG DP471B Service Manual

14. B/L POWER CIRCUIT DIAGRAM

TCON-VCC5
C4
10U/10V/0805
C28 0.1U/25V/0402
Q3
OUTB R16 1K/F/0402 APM2300
G
OUTB
1N/50V/0402
FB_B R20
FB_B
1N/50V/0402
TCON-VCC5
TC4
47U/10V/B
D1 D-1N5819
C12 C7 C16
Q2
G
OUTA
FB_A
R4 1K/J/0402
BL_PWM
C9
1U/16V/0603
LGE Internal Use Only
1U/16V/0603
D11 1N4148
PANEL_VGL
C170 D8
1N4148 C167 D10 C171
R152 C161
1K/F/0603
D2 1N4148
PANEL_VGH
C32 C40
C42 R21
100K/F/0402 4.7u/25V/1206 0.1U/25V/0402
0/J/0603
C34
R22
8.66K/F/0402
LED+
C13
LED-
D9
UDZS10B
R162 1K/F/0603
C14 R154 R156 TC6
1N/50V/0402 39/F/0603 39/F/0603 22U/10V/A
R5 169R/J/0603
C15
4.7U/6.3V/0603
VCOM
R168
5.1K/F/0402
R176 R174
5.1K/F/0402 NC/04
C175 VCOM_ADJ
POL
8 POL
10U/10V/0805
R178
100K/J/0402
IO_VCC3
U1 50K
TC33X-2-503
R12
3
10K/F/0402
R10
NC/10K/F/0402
VCOMDC
Contrl the Backlight Power On/Off
R255
B
8 TFT_CS
1K/F/0402
C168
1N/50V/0402
3-47 3-48
PANEL_VCOM LED+ L90
C194 0/J/0603
VCOM_OP
10u/16V/1206 C26
U2 10u/16V/1206
NC/TC33X-2-503
3
50K R14
U5 VCC_VCOM_OP 4.7K/J/0402
UTC3308L/SO8
R175
1 8
OUT1 V+
560/F/0402
2 7
IN1- OUT2
R173
3 6
IN1+ IN2-
4.7K/J/0402 R171 VCOMDC
4 5
GND IN2+
4.7K/J/0402
R6 1K/J/0402
1
R8
NC/48K/F/0402
+5V_SYS +5V_SYS
R254
10K/F/0402
Q37
G
APM2301A
Q38 TCON-VCC5
PMBS3904 L1 0/J/0603
C8 C6 C325 C2
0.1U/25V/0402
Copyright © 2009 LG Electronics. Inc. All right reserved.
VCC_VCOM_OP
C319
0.1U/25V/0603
R172
4.7K/J/0402
Only for training and service purposes