LG 47LV4400 Diagram

E
B
C
E
B
C
6.3V each
pin
MAIN BOARD
p/n: COV31310701
14 pin
TU13
TU3
TU2
TL6
TL1
TU1
E
C
B
C
B
C
E
C
TQ20
TQ21
V
I
V
O
A
d
j
VO
TU14
E
B
C
TQ22
EB
C
Q8
F1F2
E
B
C
Q14
U21
U9
U6
E
B
C
Q47
L43
L42
D28
U51
EB
C
EB
C
Q30
L41 L36 L44 L45
C
A1A2
EB
C
E
B
C
C
A1A2
C
A1
A2
D25
Q66
D27
Q70
U50
U52
Q46
TCN1
U14
U22
U43
U18
E
B
C
Q27
Q16
Q17
E
B
C
U53
O
G
n d
I
N
Gnd
U10
U46
312
3
U8
EB
C
EB
C
Q36
U32
C
A1 A2
C
A1A2
D54
D57
U31
U30
E
B
C
Q37
U13
Y1
MEDIATEK
ARM
MT5376JFMU
U15
U34
TUNE
R
TDVW-
H814F(A)
To SPK
To SMPS
5V_ST12V
Audio Amp
TL4
TL3
DDVR
DV33
VCCK
+5V_Tuner
LVDS_VDD
Panel_PWR
12V in
VBS_Processor
Video/Micro
Processor
Level
Shifter
TFT_
Driver
DDR
54MHz
Q69
TCN2
J14
J5
CH
CH
Vol
Vol
Enter
Home
Input
PWR
USB
HDMI 1
HDMI 2
HDMI 2
Audio Out
Optical
Audio In RGB/DVI
RGB (PC)
Y/V Pb Pr L R
1
70
1
70
J4
Panel_
Gama
F3
+5VSB
U48
E
B
C
Q40
U4
321
2
E
B
C
Q15
G
S
D
Q29
G
S
D
Q71
E
B
C
Q41
G
S
D
D11
A1A2
C
EB
C
EB
C
Q42
Q18
Q72
Grayed out
components
are on the
back side.
47LV4400 INTERCONNECT DIAGRAM
Front IR
Note: If a particular area is exhibiting a dimmer backlight level than other areas or the overall brightness seems dim, be
sure to first check the customer’s Menu setting for Backlights. Raise the percentage and see if the overall brightness
returns to normal. If not, Check the P-DIM level, it should rise with the percentage shown on screen.
100% = 3.3V. Follow the P-DIM signal all the way to the SMPS.
To the Panel Backlights
You can also test each of the 16 blocks functionality by grounding the return path signal (using 220Ω resistor).
Ft. IR/Intelligent Sensor
(1)
PWM Pins 12~14 can vary according to incoming
video IRE level, OSD Backlight setting and then
Intelligent Sensor (room light condition).
Output from the Microprocessor.
Range 0.69V to 3.3V.
PWR-ON: Starts 12V
and 40V LED Power.
No Backlights.
BL-ON: Starts
Backlights
LED Power goes to
50.
p/n: COV31147501
PANEL p/n: COV31311201
For LVDS video signal waveforms see
page 5 of the Interconnect diagram.
DC Voltages to the Panel
developed by on the Main Board,
Output from TCN1
LED SINGLE BLOCK TEST (DIM OR DARK PICTURE AREA):
Turn the Brightness, Contrast and Backlights all the way up.
Confirm 50V on C700 +.
Confirm P-DIM is approx. 3V. Using a 220Ω resistor, jump any of
the blocks grounding pin on LCN1 or LCN2 while observing the
picture and each block should turn on maximum.
To Ft. IR
To the Panel
To Spk
VCC pins 35, 36 from TL1
Made by TU1 pins 35, 26 (3.3V)
DC Voltages to the Panel
developed by on the Main Board,
Output from TCN2
Video (LRLVRO-2+/-) pins 28-33
Video Clock (LMCLK+/-) 26, 27
Video Signal Levels: p/p: Approx: 740mV
J4 "MAIN Board" To
CN202 "SMPS Board"
Pin Diode
1-3
OL
4-7
Gnd
8-9
1.64V
10
OL
11
OL
12
OL
13
OL
14
OL
Note; If there is a problem with a load from
the panel backlights, you can remove AC and
Disconnect either LCN1 or LCN2. When AC
is reapplied, the Backlight LEDs should turn
on for about 2 seconds and then they turn off.
J1
C800B
450V
68uF
450V
68uF
450V
68uF
+-
+-
100V
220uF
+-
100V
220uF
+-
50V
560uF
+-
10V
2200uF
+-
10V
2200uF
D
8
0
1
D800B
D800A
LCN1LCN2
CN202
CN101
IC901
PC901
C961
T901
C958
D120
D700
C700
C120A
R915
HS1
L801
HS3
HS5
Backlight Driver Section
HS4
D950
T601
PC601
R804A
Q800
Q600
Q601
J9
5V_ST
ZD301
12V
J28
BL_On/Off
50V
BL_PWR
25V
25V
5V_ST
50V BL_PWR
Hot
Ground
Chassis Ground
LN
AC
PFC
Bridge
C701C
F1
5A/250V
Outside legs
Gnd
Outside legs
Gnd
Outside legs
Gnd
5V_ST
PC903
Do not
Measure
398V 398V
112V
Hot Ground
Reference
HGnd
6.23V
101V
HGnd
170V
398V
165V
3.54V
165V
HGnd
0V
398V
398V
113V
HGnd
307V
20.6V
21.24V
HGnd
3.38V
19.45V
19.6V
3.89V
4.91V
Gnd
1.2V
Hot
Ground
LCN1 White Plug "SMPS Board" To "Panel LEDs"
1VLED 50V OL
2n/c n/c OL
3R8*0.86V~11.67V OL
4R7*0.86V~11.67V OL
5R6*0.86V~11.67V OL
6R5*0.86V~11.67V OL
7R4*0.86V~11.67V OL
8R3*0.86V~11.67V OL
9R2*0.86V~11.67V OL
10 R1 *0.86V~11.67V OL
11 n/c n/c OL
12 VLED 50V OL
*White to Black screen
LCN2 Black Plug "SMPS Board" To "Panel LEDs"
Pin Label Run Diode Check
1VLED 50V OL
2n/c n/c OL
3L1*0.86V~11.67V OL
4L2*0.86V~11.67V OL
5L3*0.86V~11.67V OL
6L4*0.86V~11.67V OL
7n/c n/c OL
8L5*0.86V~11.67V OL
9L6*0.86V~11.67V OL
10 L7 *0.86V~11.67V OL
11 L8 *0.86V~11.67V OL
12 n/c n/c OL
13 VLED 50V OL
*White to Black screen
Pin Label Run Diode Check
7.51V p/p
LED Drive Signal 50 IRE
2.5mSec
On
Off
Pin Label STBY Run No Load Diode Check
14
(1)
P-DIM3 0V 0.69V~3.3V 3.36V OL
13
(1)
P-DIM2 0V 0.72V~3.3V 3.36V OL
12
(1)
P-DIM1 0V 0.69V~3.3V 3.36V OL
11 BL-ON/OFF 0V 3.27V 0V (4.77V) OL
10 PWR_ON 0V 3.27V 4.77V OL
8-9 12V 0V 12.81V 12.87V 1.64V
4-7 Gnd Gnd Gnd Gnd Gnd
1-3 +5VSB 5.24V 5.22V 5.24V OL
Test1 Test2
CN202 "SMPS Board" To CN4 "MAIN Board"
10KΩ
Test 1
1) Disconnect Main Board.
2) Using 10K resistor, jump 5V_ST
(pin 1) to PWR_ON (pin 10).
3) Apply AC power.
Check 12V (pins 8-9).
Check BL power (40V).
No Backlights at this time.
10KΩ
Test 2
1) Remove AC Power.
2) Leave pin 1 to pin 10 connected.
3) Using 10K resistor, jump 5V_ST
(pin 2) to BL_On (pin 11).
4) Apply AC power.
Check BL power (50V).
Check BLs come on.
(Backlights On).
CN202
CN202
J14 "MAIN Board" to "IR Board" to J1
Pin Label STBY Run Diode Check
1IR 3.96V 3.95V OL
2IR_LED_POWER 5.24V 5.19V 0.99V
3Gnd Gnd Gnd Gnd
4 LS_SCL 3.42V 3.37V OL
5 LS_SDA 3.42V 3.37V OL
6 Light_Sensor_Det 3.56V 3.47V OL
7LED_R 3.62V 3.82V OL
8LED_B 3.03V 3.86V OL
H_VDD pins 38, 29 from TL4
Made by TU1 pin 8 (7.88V)
VDD pins 40, 41 from TP12
Made by TU1 pin 18 (16.47V)
VST pin 47 from TU3 pin 15
(-4.93V)
VGL_I pin 48 from TTP 14
Made by diode TD3 (-5V)
VGH_EVEN pin 49 from TU3
Pin 13
Made by TU3 pin 13 (-5V to 26V)
Toggles every second
VGH_ODD pin 50 from TU3
Pin 12
Made by TU3 pin 12 (-5V to 26V)
Toggles every second
VGH_R pin 52 from TU3
Pin 10
Made by TU3 pin 12 (-5V to 26V)
Toggles every second
VCC pins 25, 26 from TL1
Made by TU1 pins 35, 26 (3.3V)
H_VDD pins 22, 23 from TL4
Made by TU1 pin 8 (7.88V)
VDD pins 20, 21 from TP12
Made by TU1 pin 18 (16.47V)
VST pin 14 from TU3 pin 15
(-4.93V)
VGL_I pin 13 from TTP 14
Made by diode TD3 (-5V)
VGH_EVEN pin 12 from TU3
Pin 13
Made by TU3 pin 13 (-5V to 26V)
Toggles every second
VGH_ODD pin 11 from TU3
Pin 12
Made by TU3 pin 12 (-5V to 26V)
Toggles every second
VGH_R pin 52 from TU3
Pin 9
Made by TU3 pin 12 (-5V to 26V)
Toggles every second
Video (RMLVO-2+/-) pins 28-33
Video Clock (RMCLK+/-) 34, 35
For DC voltages for Main board
components see pages 2, 3 and 4 of the
Interconnect diagram.

LG 47LV4400 Specifications

General

Brand	LG
Model	47LV4400
Category	LCD TV
Language	English