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

- 17 -

- HDMI3  EDID  table

- Analog (RGB) EDID table

See Working Guide if you want more information about EDID
communication.

(1) 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)

(2) Connection Diagram (Auto Adjustment)

- Using Inner Pattern

- Using HDMI input

(3) 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 - 5. 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 - 5. White Balance”,
then automatically inner pattern operates. (In case of
“Inner” originally “Inner” will be selected. 

• Connect all cables and equipments like Fig.3)
• 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.

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

Color Analyzer

F u l l W h i t e P at t er n

R S-232C

<Fig.3> Connection Diagram for Adjustment White balance

(4) 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)

(5) White Balance Adjustment (Manual adjustment)

• Test Equipment: CA-210

- 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. 

• Manual adjustment sequence is like bellowed one.

- Turn to “Ez-Adjust” mode with press ADJ button of

service remocon.

- Select “10.Test Pattern” with CH+/- button and press

enter. Then set will go on Heat-run mode. Over 30
minutes set let on Heat-run mode.

- Let CA-210 to zero calibration and must has gap more

10cm from center of LCD module when adjustment. 

- Press “ADJ” button of service remocon and select

“7.White-Balance” in “Ez-Adjust” then press “

G

” button

of navigation key.

(When press “

G

” button then set will go to full white

mode)

- Adjust at three mode (Cool, Medium, Warm)
- If “cool” mode (42LB7DF-SB)

Let B-Gain to 192 and R, G, B-Cut to 64 and then
control R, G gain adjustment High Light adjustment.

- If "Medium" and "Warm" mode (42LB7DF-SB)

Let R-Gain to 192 and R, G, B-Cut to 64 and then
control G, B gain adjustment High Light adjustment.

- All of the three mode (47LB7DF-SB)

Let R-Gain to 192 and R, G, B-Cut to 64 and then
control G, B gain adjustment High Light adjustment.

- With volume button (+/-) you can adjust.
- After all adjustment finished, with Enter (

A

key) turn to

Ez-Adjust mode. Then with ADJ button, exit from
adjustment mode

* Attachment: White Balance adjustment coordination and

color temperature.

A

Using CS-1000 Equipment. 
- COOL : T=11000K, ∆uv=0.000, x=0.276 y=0.283 
- MEDIUM : T=9300K, ∆uv=0.000, x=0.285 y=0.293 
- WARM : T=6500K, ∆uv=0.000, x=0.313 y=0.329 

A

Using CS-210 Equipment. (9 CH) 
- Contrast value: 216 Gray 

Press In-Start button of Service Remocon then set the
"4.Baud Rate" to 115200. Then check RS-232C control and 

• Models : All models which use LA75A Chassis (See the first

page.) 

• Press “In-Start” button of Service Remocon, then enter the

“Option” Menu with “PIP CH-” Button 

• Select one of these three (USA, CANADA, MEXICO)

defends on its market using “Vol. +/-”button.

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)

- 18 -

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

• Check the connection between set and power cord

• Fully connected (Between set and power cord) set enter the

Auto-test sequence.

• Connect D-Jack AV jack test equipment.
• Turn on Auto-controller(GWS103-4)
• Start Auto GND test.
• If its result is NG, then notice with buzzer.
• If its result is OK, then automatically it turns to ESD Test.
• Operate ESD test
• If its result is NG, then notice with buzzer.
• If its result is OK, then process next steps. Notice it with

Good lamp and STOPER Down.

• Test Voltage  

- GND: 1.5KV/min at 100mA
- Signal: 3KV/min at 100mA

• Test time: just 1 second.
• Test point

- GND test: Test between Power cord GND and Signal

cable metal GND.

- ESD test: Test between Power cord GND and Live and

neutral.

• Leakage current: Set to 0.5mA(rms)

• R-Gain adjustment Value (default  128)
• G-Gain adjustment Value (default  128)
• B-Gain adjustment Value (default  128)
• R-Offset adjustment Value (default  128 )
• G-Offset adjustment Value (default 128 )
• B-Offset adjustment Value (default  128 )

• Threshold Down Low

20

• Threshold Up Low

23

• Threshold Down High

70

• Threshold Up High

75

- 19 -

CENTER(DEFAULT)

Cool

Mid

Warm

R Gain

192

192

192

G Gain

192

192

192

B Gain

192

192

192

R Cut

64

64

64  

G Cut

64

64

64

B Cut

64

64

64

- 20 -

Check P800 All

Voltage Level (16V, 12V, 5V)

Check Power connector

OK ?

Replace Power board

Y

N

Y

Check IC803 #4 Pin / L816

Voltage Level 3.3V

Replace IC803/ L816 &

Recheck

Y

N

Check L821

Voltage Level 2.6V

Replace IC809 &

Recheck

Y

N

Check L824

Voltage Level 1.2V

Replace IC810 &

Recheck

Y

N

Check X200 Clock

54MHz

Replace X200

Y

N

Check R154 Clock

33MHz

Maybe BCM3553(2) has troubles.

Y

N

Replace IC101 Flash Memory

N

N

N

Check Micom   IC407

Redownload or replace