DOWNLOAD LG 42LB5DF (CHASSIS:LA75A) Service Manual ↓ Size: 5.67 MB | Pages: 28 in PDF or view online for FREE

- 13 -

These instructions are applied to all of the LCD TV, LA75A
Chassis.

2.1 Because this is not a hot chassis, it is not necessary to

use an isolation transformer. However, the use of
isolation transformer will help protect test instrument. 

2.2 Adjustment must be done in the correct order. But it is

flexible when its factory local problem occurs.

2.3 The adjustment must be performed in the circumstance of

25±5°C of temperature and 65±10% of relative humidity if
there is no specific designation.

2.4 The input voltage of the receiver must keep 100~220V,

50/60Hz.

2.5 Before adjustment, execute Heat-Run for 30 minutes. 

O After Receive 100% Full white pattern (06CH) then

process Heat-run 

(Or 8. Test Pattern condition of Ez – Adjust)

O How to make set white pattern 

A.  Press Power ON button of Service Remocon
B.  Press ADJ button of Service remocon. Select "10.

Test pattern" and, after select "White" using
navigation button, and then you can see 100% Full
White pattern. 

* In this status you can maintain Heat-Run useless any

pattern generator 

Notice) If you maintain one picture over 20 minutes

(Especially sharp distinction black with white pattern
– 13Ch, or Cross hatch pattern – 09Ch) then it can
appear image stick near black level

See ADC Adjustment RS232C Protocol_Ver1.0

O 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)

O 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

Order

Command

Set response

1. Inter the Adjustment mode ad 00 00 d 00 OK00x

2. Change the Source kb 00 04

b 00 OK04x (Adjust 480i Comp1)

kb 00 06  b 00 OK06x (Adjust 1080p Comp1/RGB)

3. Start Adjustment

ad 00 10

4. Return the Response

OKx ( Success condition )

NGx ( Failed condition )

5. Read Adjustment data (main)

(main)

ad 00 20 000000000000000000000000007c007b006dx

(sub)

(Sub)

ad 00 21 000000070000000000000000007c00830077x

6. Confirm Adjustment ad 00 99 NG 03 00x (Failed condition)

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

O Summary : Adjustment component 480i/1080i and RGB

1080p is Gain and Black level setting at Analog to
Digital converter, and compensate the RGB
deviation

O 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)

* You must make it sure its resolution and pattern cause every

instrument can have different setting

O 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
- Set Component 480i mode and 100% Horizontal Color

Bar Pattern(HozTV31Bar), then set TV set to
Component1 mode and its screen to "NORMAL"

- 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

- You can see "ADC Component1 Success" message

after Adjustment success

- 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.

2) ADC 1080p Component1 / RGB adjustment

: Check connection both of Component1 and RGB
: MSPG-925FA Ë Model: 225, Pattern 65

- Set Component 1080p mode and 100% Horizontal

Color Bar Pattern(HozTV31Bar), then set TV set to
Component1 mode and its screen to "NORMAL" 

- After get the signal, wait more a second and enter the

"Ez-Adjust" with press ADJ key of Service remocon.
After then select "4.ADC 1080p Comp1/RGB" with
navigator button and press "Enter". First, it is
automatically adjustment Component1.

- 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.

- 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.

- If Adjustment doesn’t success, check conditions all of

the adjustment condition and adjustment again. See
"Error Messages" sentence. 

- After adjustment finished, press "ADJ" key and exit from

Adjustment mode.

O 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. 

O Write HDMI EDID data 

- Using instruments

(1) Jig. (PC Serial to D-Sub connection) for PC, DDC

adjustment.

(2) S/W for DDC recording (EDID data write and read)
(3) D-sub jack
(4) Additional HDMI cable connection Jig.

- Preparing and setting.

(1) Set instruments and Jig. Like pic.5), then turn on PC and

Jig. 

(2) Operate DDC write S/W (EDID write & read)
(3) It will operate in the DOS mode.

- 14 -

(Adjustment pattern : 480i / 1080P 60Hz Pattern)

LCD TV SET

(or Digital Board)

Device configuration diagram for HDMI EDID Data input

O EDID data for LA75A Chassis 

- HDMI1  EDID (DDC (Display Data Channel) Data

- HDMI2  EDID (DDC (Display Data Channel) Data

- HDMI3  EDID (DDC (Display Data Channel) Data

- Analog (RGB) EDID table

* See Working Guide if you want more information about EDID

communication.

- 15 -

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 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 07

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

O Using Instruments

(1)Color Analyzer: CA-210 (CH 9)

- Using LCD color temperature, Color Analyzer (CA-210)

must use CH 9, which Matrix compensated (White,
Red, Green, Blue compensation) with CS-2100. See
the Coordination bellowed one. 

(2) Auto-adjustment Equipment (It needs when Auto-

adjustment – It is availed communicate with RS-232C :
Baud rate: 115200) 

(3) Video Signal Generator MSPG-925F 720p, 216Gray

(Model: 217, Pattern 78)

O Connection Diagram (Auto Adjustment)

(1) Using Inner Pattern 

(2) Using HDMI input 

O White Balance Adjustment 

If you can’t adjust with inner pattern, then you can adjust it
using HDMI pattern. You can select option at "Ez-Adjust
Menu – White Balance" there items "NONE, INNER, HDMI".
It is normally setting at inner basically. If you can’t adjust
using inner pattern you can select HDMI item, and you can
adjust.

In manual Adjust case, if you press ADJ button of service
remocon, and enter "Ez-Adjust Menu – 7. White Balance",
then automatically inner pattern operates. (In case of "Inner"
originally "Inner" will be selected. 

- Connect all cables and equipments like Pic.5)
- Set Baud Rate of RS-232C to 115200. It may set 115200

orignally.

- Connect RS-232C cable to set
- Connect HDMI cable to set
- Select LA75A Chassis at Adjustment equipment, and

adjust.

O RS-232C Command (Commonly apply) 

- "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)

- 16 -

C A -100+

C O L O R

A N A L Y Z E R

T Y PE ; C A -100+

F u l l W h i t e P at t er n

R S-232C

<Connection Diagram for Adjustment White balance>

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)