LG 34UC80, Service Manual

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Copyright © 

 LG Electronics Inc. All rights reserved.

Only training and service purposes.

 Insert HDMI Jack which is connected with PC for White Bal-

ance or equivalent device.

→

  Total Assembly line should check whether the color 

coordinate(x,y) data refer to below table were meet or not.

*Note :  x,y coordinates are drifted about 0.007 after 30 mins 

heat-run. So checking color coordinate within 5-min at 

total assembly line, consider x,y coordinates might be 

up to 0.007 than x,y target of each color temperature. 

* Note : Manual W/B process 

1)  Power of

f => Power on (‘←

’

 3 times, ‘→

’ 1 time and push ‘

’)

2) and push the “←” or “→”.

3) In Service Menu.

*  When doing Adjustment, Please make circumstance as 

below.

4.3. DPM Operation check

■ Measurement Condition: 100 ~ 240 V @ 50/60Hz

(1) Set Input to DVI-D, DisplayPort, HDMI1, HDMI2

(2) Turn off the source device.

(3) Check DPM operation refer to the below table.

5. Signal composition for adjustment

5.1. I2C (100K BPS)
5.2. COMMUNICATION START

# Until ACK BIT goes LOW, Repeat it.

5.3. Command form.

Command form use DDC2AB standard communication 

protocol.

a. LEN  : DATA BYTE number to send.

b. CMD : Command language that monitor executes.

c. 

V

AL :  FOS DATA

d. CS  : Dada’s CHECHSUM that transmit

e. DELAY : 50MS           

f. A : Acknowledge    

5.4. Screen adjust command (LENGTH = 84)

5.5. EEPROM Data Write

5.5.1 Siganl TABLE

LEN  :  84h+Bytes

CMD  :  E8h

ADH  :  E2PROM  Slave 

Address(A0,A2,A4,A6,A8,AA,AC,AE), 

Not 00h(Reserved by Buffer To EEPROM)

ADL  :  E2PROM  Sub 

Address(00~FF)

Data  :  Write data

Delay :   20ms

Color 

Temperature

Cool

9,300

°K

X=0.283 (±0.03)

Y=0.298 (±0.03)

<Test Signal>

Inner pattern

(255gray,80IRE)

Medium

8,000

°K

X=0.295 (±0.03)

Y=0.305 (±0.03)

Warm

6,500

°K

X=0.313 (±0.03)

Y=0.329 (±0.03)

Luminance

(cd/m²)

Cool

Min : 170

<Test Signal>

Inner pattern

(255gray,80IRE)

Medium

Min : 200

Warm

Min : 

260

Operating 

Condition

Sync (H/V) 

or 

V

ideo

EUT

(MSPG6100)

LED

(SET)

Wattage

(W)

Sleep 

mode

Off/Off

Off

White blinking

1.2W

Off 

mode

-

-

Off

0.3

No.

Adjustment contents CMD(h

ex)

ADR

VA

L(hex)

Explanation

1

EEPROM ALL INITIA

L

E

4

00

00

adjustment Initiali

z

ation

2

EEPROM READ

E7

Slave add

At EEPROM  Read 

3

EEPROM WRITE

E8

Slave add

Data

Write data at EEPROM

4

R GAIN

1

6

00

00-

64

Tune Gain

5

G GAIN

18

00

00-

64

6

B GAIN

00

00-

64

7

BRIGHT(Backlight)

10

00

00-

64

Tune Analog Bright

8

FACTORY RESET

F0

00

0

Factory reset

9

AUTO_COLOR_ADJ

UST

F1

00

0

AUTO COLOR Tuning

0:Auto color

10

COLOR_MODE_CH

ANGE

F2

00

1

WARM(

6500

K)

2

COOL(9300K)

11

Elapsed time Clear

E9

00

00

Aging off  &Clear elapse

d time

12

Aging On/Off

F3

00

FF/00

FF:ON / 00:OFF

13

Input Select

F

4

00

0xD0

1:DisplayPort

0x90

2:HDMI1

0x91

3:HDMI2

0xD1

4

:Thunderbolt (UC98 o

nly)

1

4

SYSTEM  RESET

F5

00

00

RestartSystem

15

Select Language

6

8

00

0x00 

~

 0x0F

00:English,
01:German
02:French
03:Spanish
0

4

:Italian

05:Swedish,
0

6

:Finnish

07:Portuguese
08:Bra

z

il

09:Polish
0A:Russian
0B:Greek
0C:Ukrainian
0D:Chinese
0E:Japanese
0F:Korean

EDID SN UPDATE

0x77

0

0x01

~

0x02

0x01 :HDMI1
0x02 :HDMI2

APD command

0xF7

00

0x00

~

0x01

0x00:OFF
0x01:ON

Module name

LM

34

0UW3