LG 55LW5600 Troubleshooting Manual page 96

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,
st
1 : 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 Inverter.
nd
2 : Turn off Local Dimming in the Customers Menu or unplug P832.
If the brightness returns to normal, examine the signals required for Local Dimming.
(SIN, V-SYNC and SCLK). Suspect the Main Board.
You can also test each of the 12 blocks functionality by grounding the return
path signal (V1~V4) through a 220Ω, providing the 63V LED Power is present.
See "LED Single Block Test" instructions below.
P202 White Plug "SMPS Board" To "Panel LEDs"
Pin Label TP Run Diode
1 LED+ C256+ 63V OL
2 n/c n/c n/c OL
MOSI Pin 4 P832
3 VC-3A EL70 *1.59V~18V OL
4 VC-3B EL71 *1.59V~18V OL Local Dimming On
*1.59V~18V
5 VC-3C EL72 OL
6 VC-3D EL73 *1.59V~18V OL
7 VC-4A EL74 *1.59V~18V OL
8 VC-4B EL75 *1.59V~18V OL
Local Dimming Off
*1.59V~18V
9 VC-4C EL76 OL
*1.59V~18V
10 VC-4D EL77 OL
11 n/c n/c n/c OL
12 LED+ C256+ 63V OL
SCLK Pin 6 P832
*White to Black screen
P203 Black Plug "SMPS Board" To "Panel LEDs"
Pin Label TP Run Diode
1 LED+ C256+ 63V OL
2 n/c n/a n/c OL
V-SYNC Pin 1 P832
*1.59V~18V
3 VC-1A EL62 OL
*1.59V~18V
4 VC-1B EL63 OL
*1.59V~18V
5 VC-1C EL64 OL
*1.59V~18V
6 VC-1D EL65 OL
7 n/c n/a n/c OL
8 VC-2A EL66 *1.59V~18V OL
9 VC-2B EL67 *1.59V~18V OL
20V p/p
*1.59V~18V
10 VC-2C EL68 OL
Any drive signal
*1.59V~18V
11 VC-2D EL69 OL
VC1 through VC4
12 n/c n/a n/c OL
13 LED+ C256+ OL
63V
*White to Black screen
SMPS TEST 1: Force Power Supply On.
SMPS TEST 1 SMPS TEST 2
Disconnect P502 on Main board.
P201 P201
Top pins on Top pins on
(A) Jump pins 9, 10, 11 or 12 (3.5V) to pin 1.
connector connector
23 24 23 24
are odd numbers. are odd numbers.
Test Voltage Outputs 12V, 24V to Main and
12V 21 22 12V 21 22
63V to the LED Backlights. Remove AC power.
12V 19 20 12V 19 20 Leave the jumper in place.
DRV-ON
No Backlights. 63V to Backlights reads 56V.
12V 17 18 12V 17 18
15 16 15 16
B
STBY 3.5V STBY 3.5V SMPS TEST 2: Force the Backlights On.
13 14 13 14
9,10,11,12 9,10,11,12
(B) Jump pins 9, 10, 11 or 12 (3.5V) to pin 18
11 12 11 12
(DRV-ON). Apply AC power, the Backlights
9 10 should turn on. Note, the LED B+ will now be
9 10
65V.
7 8 7 8
A A
5 6 5 6
Note; If there is a problem with a load from the
24V 3 4 24V 24V 3 4 24V
panel backlights, you can remove AC and
1 2 24V 1 2 24V
Disconnect P202 or P203. When AC is
PWR ON
PWR ON
reapplied, the Backlight LEDs should turn on
for about 4 seconds and then shut off.
LED SINGLE BLOCK TEST DIM OR DARK PICTURE:
p/n: EBR72671301
Confirm the 63V to the LED Backlights is present.
Turn the Brightness, Contrast and Backlights all the way up.
Front IR/Key
Confirm P-DIM is 3.3V. Using a 220Ω resistor, jump any of the blocks
grounding lug (VC_1~4_A~D) while observing the picture and each block
Ft. IR/Intelligent Sensor
should turn on maximum.
And Soft Touch Key Board
P832 "SMPS" to P3503 "MAIN Board"
Pin Label Run Diode Pin Label
1 VSYNC 0V 2V 5 GND
2 SDA 3.2V OL 6 SCLK
3 SCL 3.2V OL 7 N.C.
4 SIN 0V OL 8 REVERSE
No Stand-By voltages
BD101
+
L601
-
3.57V p/p
Q602
MOSI Pin 4 P832
3.57V p/p
Q601
D603
3.54V p/p
RL101 F101
3.15A / 250V
3.5V p/p
F100
5A / 250V
SK100
Off
AC In
Stby: 154V
Run: 398.5V
Different Size, W/Washer
On
Indicates Hot
Ground
2mSec
PANEL TEST
To run the T-CON "Panel Test",
remove the LVDS cables.
A~D
Jump 12V to the 12V fuse.
LVDS
Jump VCC 3.3V to pin 44 on CN1.
White, Red, Blue, Green and Black
patterns show on screen.
12V
HVDD 8.21V
Gnd
CN2
L3 (3.35V)
L1 L2
Gnd
D5
D6
Gnd
Gnd
US1 US1
VDD 16.4V
Pin 18
Q12
Q11
(25.75V) D3
1
(16.18
2 2 3 -5.3V
D1
-2.43V
V) 3 2 2
D7 1) 1
D2
29.26.4V
3) Gnd
(15.87V) 3.38V
2) 27.75V
2) 2.6V
(29.86V) D4
3) 29.86V
1) 0.59V
VGH 27.74V
VGL -5V
(3.3V)
CN4
FL1
27.74V 3.3V
Pin 51, 52 VGH Pin 35, 36 VCC
Pin 47, 48 VGL -5.3V Pin 40, 41 VDD 16.4V
8.21V
Pin 38, 39 HVDD
Other Voltages from U6 to the Panel with no silk screen labels:
U6 pin 10: (16.12V) to CN4 pin 2, CN5 pin 59
U6 pin 11: (13.3V) to CN4 pin 3, CN5 pin 58
U6 pin 12: (12.2V) to CN4 pin 4, CN5 pin 57
U6 pin 13: (10.26V) to CN4 pin 5, CN5 pin 56
55LW5600 INTERCONNECT DIAGRAM
(1) PWM Pin 22 can vary according to
PWR-ON: Starts 12V, 24V
incoming video IRE level, OSD
Run Diode
and 63V LED Power. (56V
Backlight setting and then Intelligent
at this time). No Backlights.
Gnd Gnd
Sensor (room light condition).
0V Output from the Video Processor.
OL
DRV-ON: Starts Backlights.
Range 0.2V to 3.3V.
LED Power goes to 63V.
n/c n/c
0V 1.91V
To the
Panel
P203 P202
63V
- + - +
C257 C256
D253
Cold (Chassis) VC_3B
VC_2C
Gnd side
VC_3A
Q251
VC_2D
P701
n/c
D251
SMPS BOARD D252
P832
p/n: EAY62169901
D255
D256
IC102
P201
T101
D261 D202
Stand-By
D201
3.5V
Source
Stby: 57V
T501
Run: 396.5V Hot
F501
Ground
F501
IC502
Q102
Side
1A / 250V
IC501
Q101
LVDS
12V
CN3 n/c
Gnd Gnd
Gnd
CN1
U5
3A/ Panel
F1
U5
125V Test
FL2
TP 44 5) 3.3V 4) Gnd
6) 3.3V 3) Gnd
VCC 3.3V
7) 3.15V 2) Gnd
8) 3.3V 1) Gnd
UC1
U6
P-VDD 10
16.37V
From VDD Pins 7-8
(3.3V)
CN5
TO TFT MODULE
27.74V 3.3V
Pin 9, 10 VGH Pin 25, 26 VCC
-5V 16.4V
Pin 13, 14 VGL Pin 20, 21 VDD
8.21V
Pin 22, 23 HVDD
U6 pin 14: (5.9V) to CN4 pin 8, CN5 pin 53
U6 pin 15: (4.05V) to CN4 pin 9, CN5 pin 52
U6 pin 18: (3.01V) to CN4 pin 10, CN5 pin 51
U6 pin 19: (2.36V) to CN4 pin 11, CN5 pin 50
P201 "SMPS Board" To P502 "MAIN Board"
Pin Label STBY Run Diode Check
ERROR
24 n/c n/c 2.2V
n/c
23 n/c n/c n/c
22 PWM 0V 0.2V~3.3V OL
(1)
21 12V 0V 12.07V 0.48V
20 n/c n/c n/c OL
19 12V 0V 12.07V 0.48V
DRV-ON 0V 3.24V OL
18
17 12V 0V 12.07V 0.48V
16 V_Sync 0V 0V OL
13-15 Gnd Gnd Gnd Gnd
9-12 3.5V 3.56V 3.51V OL
5-8 Gnd Gnd Gnd Gnd
2-4 24V 0V 25V 1.1V
PWR-ON 0V 3.4V 1.16V
1
P502 P3503
RL_ON Drivers
E E
C C
B B
Q504
Q502 Q501
INV_CTL B 3 2 IC502 Power Det (24V)
C E 1
3 IC503
2 Power Det (12V)
1
L1704
Audio Amp
L1703
IC1702 Amp
Mute
C Q1701
To Spk
E B
L1708
1.5V_FRC IC5402
12.43V
P1702
Each Pin
IC5403
L1707
E C
B
Q5201 G S
Q5202
P3502 D
URSA Reset
DDR IC5301
IC5202
IC401
DDR
IC5201
SPI Flash
FRC
P3501
IC402 DDR
X5201
Q505 B E
24MHz IC508
C
IC5401
Q506 B 1.5V_DDR
C
E
1.26V_FRC
G
S Q507 IC504 2.5V_BCM35230
D
Panel Vcc Switch
P601 N/C
MICRO 10Mhz X601
IC602
EEPROM
P901
C Q904 Q1002
D
E B
C
32.78K X602 G S
E
C
B E Q1001
C
B
Q901
Q906
B B E SW1 Wireless Power SW
Q902
E C
RS232 SW1
Microprocessor
Reset
IC803
P1302
Warning: IC802
IC801
T-CON Board
PC EDID
under shield.
D810
C
PC Data
Be sure to reinsert
A1 A2
screws before
operating set with
shield removed.
P901 Connector "MAIN Board" To "IR Board"
Pin Label STBY Run Diode Pin Label STBY Run Diode Pin
1 7 13
SCL 3.55V 3.48V 3.29V Gnd Gnd Gnd Gnd
2 8 14
SDA 3.55V 3.48V 3.29V LED_B 0V 0V OL
3 9
Gnd Gnd Gnd Gnd IR 1.5V 1.41V OL 15
4 KEY 1 3.31V 3.31V 1.84V 10 Gnd Gnd Gnd Gnd
5
KEY 2 3.31V 3.31V 1.84V 11 +3.3V_Normal 0V 3.33V 0.55V
6
3.5V_ST 3.55V 3.48V 1.15V 12
LED_R 0V 0V 2.68V
p/n: EAJ61750001 (All Models)
PANEL PART NUMBERS
p/n: EAJ61928201 (AUSYLJR/UR)
P1302 "MAIN Board" To "Motion Remote"
Pin Label STBY Run Diode Check
1 3.5V_Normal 0V 3.41V 0.56V
2 Gnd Gnd Gnd Gnd
3 M_Remote_RX 0V 3.30V OL
4 M_Remote_TX 0V 3.31V OL
5 Reset 0V 3.32V 2.41V
6 DC_MRemote 0V 3.31V 2.42V
7 DD_MRemote 0V 3.31V 2.40V
8 Gnd Gnd Gnd Gnd
9 GPI0-O 0V 0V OL
10 GPI0-1 0V 0V OL
11 GPI0-2 0V 0V OL
12 GPI0-3 0V 0V OL
P502
Debug "MAIN Board"
SW5201
n/c To P201
Debug "SMPS Board"
P101
P5201
N/C
Pin
P102
0.9V_Core SW 1
3.3V_
5V_Normal
L505
Q503 2-4
Normal
IC507
IC501
5-8
IC505
0.9V_CORE
9-12
Q508
IC506
13-15
0.9V_Core SW
16
NAND
5V_USB
17
3.3V_FRC FLASH
X101 18
USB2 EDID
IC1203
19
IC102
45Mhz
IC103
20
21
NVRAM
BCM RGB_DDC_SCL 22
IC101
G B
Q102
23
D S IC1204
D G
Q101
24
Q710
S B
Video RGB_DDC_SDA
CEC
For voltages, see
Processor
USB1 EDID
SMPS Tables.
G B
Q801 D S
IC804 IC701
A1 C
A2
HP P3503 "Main" to
B E D713
C
Mute P832 "SMPS"
Earphone
D711
Pin
Amp
C
HDMI
A1 A2 1
Selector
MAIN BOARD
2
3
p/n: EBR72717002 AUSYLHR
D708
4
p/n: EBR73145701 AUSYLJR
A1 C
A2
p/n: EBR72717004 AUSYLUR 5
p/n: EBT61398007 AUSYLUR
6
TU_CVSB 7
18. IF p
18
17. IF n
D710
16. IF AGC Q2105
8
15. Reset
C
14. 3.3V
B E
13. 1.26V
3 1 A1 A2
C For voltages, see
12. GND 2
TU2101
11. CVBS IC2103
B E SMPS Tables.
10. NC
TUNER 9. SIF C 2
Q2104
1.26V_TU
8. NC
7. SDA
TU_SIF
6. SCL A1
C
5. NC
A2
4. NC
D707
3. 5V
1
2. NC
1. NC
For DC voltages for
Main board
components see
Page 2 of the
Interconnect diagram.
Label STBY Run Diode
Gnd Gnd Gnd Gnd
S/T_SCL 3.55V 3.48V 1.91V
S/T_SDA 3.55V 3.48V 1.92V
Motion Remote
p/n: EBR72499601
Diode
2.79V
OL
Gnd
1.15V
Gnd
OL
2.09V
1.54V
2.09V
OL
2.09V
2.4V
OL
OL
Diode
OL
OL
OL
Gnd
OL
1.73V
1.71V
OL