DOWNLOAD LG 42LG70YD (CHASSIS:LJ83A) Service Manual ↓ Size: 7.6 MB | Pages: 46 in PDF or view online for FREE

Model
42LG70YD (CHASSIS:LJ83A)
Pages
46
Size
7.6 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lg70yd-chassis-lj83a.pdf
Date

LG 42LG70YD (CHASSIS:LJ83A) Service Manual ▷ View online

- 13 -
- 14 -
3.4. Using RS-232C 
Adjust 3 items at 3. PCB assembly adjustments by below
adjustment sequence after the order.
(1) Adjustment protocol
See ADC Adjustment RS232C Protocol_Ver1.0
(2) Necessary items before Adjustment items
- Pattern Generator : (MSPG-925FA)
- Adjust 480i Comp1(MSPG-925FA: model:209, pattern:65)
- Adjust 1080p Comp1/RGB(MSPG-925FA :model:225,
pattern:65)
* If you want more information then see the below Adjustment
method (Factory Adjustment)
(3) Adjustment sequence
- ad 00 00 : Enter the ADC Adjustment mode.
- kb 00 04 : Change the mode to Component1 (No actions)
- ad 00 10: Adjust 480i Comp1(Change the mode and
adjustment action)
- kb 00 06: Change to RGB-DTV mode(No action)
- ad 00 10: Adjust 1080p Comp1/RGB(Change the mode
and adjustment action)
- ad 00 90: End of the adjustment
4. Factory Adjustment
4.1. Auto Adjust Component 480i/1080p
RGB 1080p
A
Summary : Adjustment component 480i/1080i and RGB
1080p is Gain and Black level setting at Analog
to Digital converter, and compensate the RGB
deviation
A
Using instrument
- Adjustment remocon, 801GF(802B, 802F, 802R) or
MSPG925FA pattern generator
(It can output 480i/1080i horizontal 100% color bar pattern
signal, and its output level must setting 0.7V±0.1V p-p
correctly)
<Fig.1> Adjustment pattern : 480i / 1080p 60Hz Pattern
* You must make it sure its resolution and pattern cause every
instrument can have different setting
A
Adjustment method 480i Comp1, Adjust 1080p Comp1/
RGB (Factory adjustment)
1) ADC 480i Component1 adjustment
- Check connection of Component1 
- MSPG-925FA --> Model: 209, Pattern 65
2) Set Component 480i mode and 100% Horizontal Color
Bar Pattern(HozTV31Bar), then set TV set to
Component1 mode and its screen to “NORMAL”
3) After get the signal, wait more a second and enter the
“Ez-Adjust” with press ADJ key of Service remocon.
After then select “3.ADC 480i Comp1” with navigator
button and press “Enter”. It is automatically adjustment
4) You can see “ADC Component1 Success” message
after Adjustment success.
5) Error Messages: When its adjustment is not correct,
“ADC Component1 480i Fail” message displayed. If
component is not connection “Component1 Not
Connected”, its format is not 480i then “Not Valid
Format”, its signal don’t out then “Check Signal Status"
message displayed. These messages will be displayed
just a second.
6) ADC 1080p Component1 / RGB adjustment
- Check connection both of Component1 and RGB
- MSPG-925FA --> Model: 225, Pattern 65
7) Set Component 1080p mode and 100% Horizontal Color
Bar Pattern(HozTV31Bar), then set TV set to
Component1 mode and its screen to “NORMAL”
8) After get the signal, wait more a second and enter the
“Ez-Adjust” with press ADJ key of Service remocon.
After then select “2.ADC 1080p Comp1/RGB” with
navigator button and press “Enter”. First, it is
automatically adjustment Component1.
- 15 -
Order
Command
Set response
1. Inter the 
ad 00 00
d 00 OK00x
Adjustment mode
2. Change the 
kb 00 04
b 00 OK04x (Adjust 480i Comp1 )
Source
kb 00 06 
b 00 OK06x (Adjust 1080p Comp1/RGB)
3. Start Adjustment
ad 00 10
4. Return the 
OKx ( Success condition )
Response
NGx ( Failed condition )
5. Read 
(main)
(main)
Adjustment data
ad 00 20
000000000000000000000000007c007b006dx
( sub )
(Sub)
ad 00 21
000000070000000000000000007c00830077x
6. Confirm 
ad 00 99
NG 03 00x (Failed condition)
Adjustment
NG 03 01x (Failed condition)
NG 03 02x (Failed condition)
OK 03 03x (Success condition)
7. End of Adjustment ad 00 90
d 00 OK90x
9) If adjustment is correctly finished, “ADC Component1
Success” message will be displayed. But adjustment is
not correctly finished, “ADC Component1 1080p Fail”
message will be displayed.
10) After  adjustment Component1 mode, move to RGB-
DTV mode automatically and RGB adjustment start.
After RGB Adjustment successfully finished, “ADC
RGB 1080P Success” message will be displayed.
11) If Adjustment doesn’t success, check conditions all of
the adjustment condition and adjustment again. See
“Error Messages” sentence. 
12) After  adjustment finished, press “ADJ” key and exit
from Adjustment mode.
4.2. EDID (The Extended Display Identification
Data) / DDC(Display Data Channel)
Download.
A
Summary
• It is established in VESA, for communication between PC
and Monitor without order from user for building user
condition. It helps to make easily use realize "Plug and
Play" function. 
• For EDID data write, we use DDC2B protocol. 
A
Write HDMI EDID data
• Using instruments
- Jig. (PC Serial to D-Sub connection) for PC, DDC
adjustment.
- S/W for DDC recording (EDID data write and read)
- D-sub jack
- Additional HDMI cable connection Jig.
• Preparing and setting.
- Set instruments and Jig. Like pic.5), then turn on PC
and Jig. 
- Operate DDC write S/W (EDID write & read)
- It will operate in the DOS mode
• EDID data for LJ83A Chassis(Model name = LG TV)
- HDMI1 EDID table 
- HDMI2 EDID  table 
- 16 -
LCD TV SET
(or Digital Board)
USB
<Fig.2> For write EDID data, setting Jig and another instruments.
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 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
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