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Model
37LG50 (CHASSIS:LA84A)
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29
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4.28 MB
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Service Manual
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Device
TV / LCD
File
37lg50-chassis-la84a.pdf
Date

LG 37LG50 (CHASSIS:LA84A) Service Manual ▷ View online

- 13 -
3.3.2 ADC 1080p Comp1/RGB
1) Check the connection condition of Component1 and
RGB from the device to use.
2) Apply 1080p Mode, 100% Horizontal Color Bar Pattern
to Comp1 and RGB port.
(MSPG-925 Series => model:225 , pattern:65 )
3) Set the input to Component1 and select °ÆNormal°Ø
as video.
4) Wait for one second or longer after receiving the signal,
press the ADJ key of the R/C to enter into 'Ez-Adjust',
select '4. ADC 1080p Comp1/RGB', and press the
Enter key to automatically adjust the component1.
5) If it is normally adjusted, the message "ADC
Component1 Success" is displayed, or if not, the
message 'ADC Component1 1080p Fail' is displayed.
6) When adjusting the Component1 is ended, it is
automatically switched to the RGB-DTV Mode and the
RGT adjustment is started. If it is normally adjusted, the
message "ADC RGB 1080P Success" is displayed.
7) If it is not normally adjusted, check the pattern or the
adjustment condition, and then readjust. The error
message is same to 6).
8) If the adjustment is ended, press the ADJ key to exit
from the adjustment mode. If the 7) adjustment is
ended, press the ADJ or the Exit of the adjustment R/C
to exit from the adjustment mode.
4. EDID(The Extended Display Identification
Data) / DDC(Display Data Channel) download
4.1 Overview  
VESA specification. Function to implement the "Plug and
Play" for automatically reconfiguring the user°Øs environment
to directly use by exchanging the information with no direct
command to the PC or the monitor from the user. 
4.2 Device to use  
- PC (S/W included: EDID Data Write & Read)
- EDID DOWNLOAD JIG
- HDMI Cable, D-sub Cable
4.3 Adjustment wiring diagram (D/L device
configuration diagram)  
4.4 How to download  
1) Configure the download environment as shown at the
adjustment wiring diagram and turn on the PC.
2) Execute the DDC program. (EDID Data Write & Read)
3) Go to Model -> Open, and select the EDID data of the
desired model.
4) Check the item to download from the <Test> item
4-1) HDMI & RGB: Check Digital & Analog
4-2) (Only)HDMI: Check Digital only
5) Press ESC(Cancel Mode) -> F8(Auto Mode). (Set Auto
Detecting)
6) Connect the desired signal cable to the set.
7) Make sure that the popup "Proceed to write?" is displayed.
8) Press the Enter key or the space key to download.
9) After downloading, check the OK message and disconnect
the connected cable.
LCD TV SET
(or VSC Board)
USB
D-SUB 
DVI to HDMI
Device configuration diagram for HDMI EDID Data input
- 14 -
4.5 EDID DATA  
Note) Because downloading can be down at the power on
mode only, if it is not set, press the Power ON key of
the remote controller to proceed.
O  
HDMI1  EDID (DDC (Display Data Channel) Data 
O  
HDMI2  EDID (DDC (Display Data Channel) Data
O  
HDMI3  EDID (DDC (Display Data Channel) Data
O  
Analog (RGB) EDID table
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 00 11 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23
20 09 48 4C AF CF 00 31 40 45 40 61 40 81 80 A9 40
30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 C4 8E 21 00 00 1E 02 3A 80 18 71 38 2D 40
50 58 2C 45 00 C4 8E 21 00 00 1E 00 00 00 FD 00 30
60 58 1F 64 11 00 0A 20 20 20 20 20 20 00 00 00 FC
70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 8A
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0 02 03 18 F1 47 84 05 03 02 20 22 10 23 15 07 50
10 67 03 0C 00 10 00 B8 2D 01 1D 00 72 51 D0 1E 20
20 6E 28 55 00 C4 8E 21 00 00 1E 01 1D 80 18 71 1C
30 16 20 58 2C 25 00 C4 8E 21 00 00 9E 8C 0A D0 8A
40 20 E0 2D 10 10 3E 96 00 C4 8E 21 00 00 18 8C 0A
50 D0 8A 20 E0 2D 10 10 3E 96 00 13 8E 21 00 00 18
60 26 36 80 A0 70 38 1F 40 30 20 25 00 C4 8E 21 00
70 00 1A 00 00 00 00 00 00 00 00 00 00 00 00 00 27
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 00 11 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23
20 09 48 4C AF CF 00 31 40 45 40 61 40 81 80 A9 40
30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 C4 8E 21 00 00 1E 02 3A 80 18 71 38 2D 40
50 58 2C 45 00 C4 8E 21 00 00 1E 00 00 00 FD 00 30
60 58 1F 64 11 00 0A 20 20 20 20 20 20 00 00 00 FC
70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 8A
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0 02 03 18 F1 47 84 05 03 02 20 22 10 23 15 07 50
10 67 03 0C 00 30 00 98 25 01 1D 00 72 51 D0 1E 20
20 6E 28 55 00 C4 8E 21 00 00 1E 01 1D 80 18 71 1C
30 16 20 58 2C 25 00 C4 8E 21 00 00 9E 8C 0A D0 8A
40 20 E0 2D 10 10 3E 96 00 C4 8E 21 00 00 18 8C 0A
50 D0 8A 20 E0 2D 10 10 3E 96 00 13 8E 21 00 00 18
60 26 36 80 A0 70 38 1F 40 30 20 25 00 C4 8E 21 00
70 00 1A 00 00 00 00 00 00 00 00 00 00 00 00 00 2F
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 00 11 01 03 18 73 41 96 0A CF 74 A3 57 4C B0 23
20 09 48 4C AF CF 00 31 40 45 40 61 40 81 80 A9 40
30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 C4 8E 21 00 00 1A 02 3A 80 18 71 38 2D 40
50 58 2C 45 00 C4 8E 21 00 00 1E 00 00 00 FD 00 30
60 58 1F 64 11 00 0A 20 20 20 20 20 20 00 00 00 FC
70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 F6
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0 02 03 04 00 0E 1F 00 80 51 00 1E 30 40 80 37 00
10 C4 8E 21 00 00 1C F1 27 00 A0 51 00 25 30 50 80
20 37 00 C4 8E 21 00 00 1C 26 36 80 A0 70 38 1F 40
30 30 20 25 00 C4 8E 21 00 00 0A 00 00 00 00 00 00
40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
50 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
60 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 BC
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 00 11 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23
20 09 48 4C AF CF 00 31 40 45 40 61 40 81 80 A9 40
30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 C4 8E 21 00 00 1E 02 3A 80 18 71 38 2D 40
50 58 2C 45 00 C4 8E 21 00 00 1E 00 00 00 FD 00 30
60 58 1F 64 11 00 0A 20 20 20 20 20 20 00 00 00 FC
70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 8A
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0 02 03 18 F1 47 84 05 03 02 20 22 10 23 15 07 50
10 67 03 0C 00 20 00 B8 2D 01 1D 00 72 51 D0 1E 20
20 6E 28 55 00 C4 8E 21 00 00 1E 01 1D 80 18 71 1C
30 16 20 58 2C 25 00 C4 8E 21 00 00 9E 8C 0A D0 8A
40 20 E0 2D 10 10 3E 96 00 C4 8E 21 00 00 18 8C 0A
50 D0 8A 20 E0 2D 10 10 3E 96 00 13 8E 21 00 00 18
60 26 36 80 A0 70 38 1F 40 30 20 25 00 C4 8E 21 00
70 00 1A 00 00 00 00 00 00 00 00 00 00 00 00 00 17
- 15 -
5. Adjusting the White Balance
5.1 Overview  
- Purpose and principle for adjusting the white balance
- Purpose : Adjust the white balance to reduce the deviation
of the module.
- Principle: The full dynamic range of the module when the
RGB gain on the OSD is 192. In order to adjust the white
balance with no saturation of the full dynamic range and the
data, fix one of the RGB gains to 192 and decrease the
remaining two gains to adjust
5.2 Device to use  
1) Color Analyzer : CA-210 (NCG: CH 9 / WCG: CH12)
2) Computer to adjust (needed for the automatic adjustment,
possible to communicate with the RS-232C)
3) Adjustment remote controller
4) Video Signal Generator MSPG-925F 720p/216Gray
(Model:217, Pattern:78)
=> Applied only when the inner pattern cannot be used
*Use the Color Analyzer with the matrix calibrated by the CS-
1000
5.3 Measuring instrument wiring diagram  
5.4 RS-232C Command used for the automatic
adjustment  
- "wb 00 00": Start Auto-adjustment of white balance.
- "wb 00 10": Start Gain Adjustment (Inner pattern) 
- "jb 00 c0" : 
- …
- "wb 00 1f": End of Adjustment
* If it needs, offset adjustment (wb 00 20-start, wb 00 2f-
end)
- "wb 00 ff": End of white balance adjustment (inner pattern
disappear)
6. How to adjust
6.1 How to adjust automatically 
1) The adjustment condition should be set by the Power On
key.
2) Perform the zero calibration of the Color Analyzer and
place the probe close to the display center.
3) Connect the communication cable (RS-232C).
4) Select the desired model of the adjustment program and
perform the adjustment.
5) After the adjustment is ended (check the OK sign), check
the adjustment condition for each mode of the set.
(Warm, Medium, Cool)
6) Disconnect the probe and the communication cable to end
the adjustment.
* The adjustment should be started with "wb 00 00" and ended
with "wb 00 ff", and the offset should be adjusted when
necessary.
6.2 How to adjust manually
1) The adjustment condition should be set by the Power On
key.
2) Press the ADJ of the R/C to enter into 'EZ-ADJUST'.
3) Select '10.TEST PATTERN' with the CH +/- key and press
the Enter key for 30 minutes or longer to perform the heat
run.
4) Perform the zero calibration of the Color Analyzer and fix
the sensor with the 10cm or less distance at the center of
the LCD module surface when adjusting.
5) Press the ADJ of the R/C to select '7.White-Balance' of the
Ez-Adjust and press the right arrow key(
G
) to enter into
the adjustment mode.
(As soon as you press '
G
', the screen is entered into the
full white inner pattern.)
6) Fix one of the R/G/B gains to 192 and decrease the
remaining two gains to adjust not to exceed 192.
7) The adjustment is done at three white balances of Cool,
Medium and Warm.
* The inner pattern is basically used, and if it is not possible, the
adjustment can be done by selecting the HDMI input. NONE,
INNER or HDMI can be selected by the bottom option at the Ez
Adjust Menu 7.White Balance menu and it is set to INNER as
default. If the adjustment cannot be done by the inner pattern,
select the HDMI to adjust.
* Adjustment environment and reference
1) Environment illuminance
Adjust it to 10 LUX or less at the place where the light
source such as lamp should be blocked at maximum.
2) Probe location
- PDP: Locate the Color Analyzer (CA-100, CA-100+,
CA210) close to the module surface to measure and
adjust
- LCD: Maintain  the  Color Analyzer (CA-210) close to the
module surface by 10cm or less and keep the probe
of the Color Analyzer perpendicular to the module
surface (80°~ 100°).
3) Aging time
- Keep the power on after the aging start (with no power off)
to perform the heat run for 15 minutes or longer.
- Keep the white pattern with the inner pattern for the PDP.
- For the LCD, make sure that the back light is turned on by
using no signal and the full white pattern or others.
RS-232C COMMAND
Meaning
[CMD    ID      DATA]
wb
00
00
White Balance adjustment start.
wb
00
10
Start of adjust gain (Inner white pattern)
wb
00
1f
End of gain adjust
wb
00
20
Start of offset adjust(Inner white pattern)
wb
00
2f
End of offset adjust
wb
00
ff
End of White Balance adjust(Inner pattern disappeared)
- 16 -
6.3 Reference 
(White Balance adjustment coordinate and
White balance)
O  
Brightness: Full white 216 Gray 
O  
Standard color coordinate and white balance when using the
CS-1000
O  
Standard color coordinate and white balance when using the
CA-210 (CH 10)
7. Select the option by country
7.1 Overview  
only, which selects the rating related country.
- Applied models: LA84A Chassis applied None USA
Model(Canada, Mexico)
7.2 How to select  
1) Press the In-Start key of the R/C and press the red oval
OP1(PIP CH-) key to enter into the Factory Option menu.
2) Select 1.USA, 2.CANADA or 3.MEXICO from the country
select according to the destination. At this time, use the
volume +/- key to adjust
8. Set the shipping mode (In-stop)
- After completing the final test, in order to set the set to the
shipping condition, press the In-Stop key of the R/C to make
sure that the set is turned off.
9. GND and resisting pressure test
9.1 How to test  
1) Preparing for the automatic test on the GND & resisting
pressure
- Make sure that the power cord is completely inserted into
the set. (When it is disconnected or loosened, test after
inserting it)
2) Perform the automatic test on the GND & resisting
pressure
- The set with power cord, the cord and the A/V completely
inserted into the tuner is loaded on the pallet and entered
into the automatic test process.
- Connect the D-terminal AV JACK tester
- Turn on the automatic (GWS103-4)
- Perform the GND TEST
- If it is not good, the buzzer is operated to notify the test
result to the operator.
- If it is OK, it is automatically switched to the resisting
pressure test. (Disconnect the cord and the A/V from the
AV JACK BOX)
- Perform the resisting pressure test
- If it is not good, the buzzer is operated to notify the test
result to the operator.
- If it is OK, the GOOD LAMP is turned and the stopper is
moves down, and it moves to the next process.
9.2 Items to manage  
O  
TEST voltage
- GND:1.5KV/min at 100mA
- SIGNAL:3KV/min at 100mA
O
TEST time:1 second
O  
TEST POINT
- GND TEST = between POWER CORD GND and
SIGNAL CABLE METAL GND
- Resisting pressure TEST = between POWER CORD
GND and LIVE & NEUTRAL
O  
LEAKAGE CURRENT: Set to 0.5mArms 
Color temperature
Color Coordination         
Temp
UV
x
y
COOL
0.276
0.283
11000K
0.0000
MEDIUM
0.285
0.293
9300K
0.0000
WARM
0.313
0.324
6500K
0.0000
Color temperature Test Equipment
Color Coordination
x
y
COOL
CA-210
0.276±0.002
0.283±0.002
MEDIUM
CA-210
0.285±0.002
0.293±0.002
WARM
CA-210
0.313±0.002
0.329±0.002
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