42LC2DR (CHASSIS:LB61C) - LG TV Service Manual (repair manual). Page 7

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No

Item

Min

Typ

Max

Unit

Remark

1.

White peak Brightness 

400

500

cd/m

2

(Center 1-point/Full White Pattern)

2.

White average brightness

cd/m

2

Full White

3.

Brightness uniformity

80

%

Full White

4.

Color coordinate

RED

X

Typ

0.638

Typ

40% Filter

Y

- 0.03

0.340

+ 0.03

40% Filter

GREEN

X

0.279

40% Filter

Y

0.611

40% Filter

BLUE

X

0.146

40% Filter

Y

0.062

40% Filter

WHITE

X

0.272

40% Filter

(Standard)

Y

0.278

40% Filter

5.

Contrast ratio

600:1

800:1

W/O AI(42LC2DR-AC)

1200:1

1600:1

With AI(42LC2DR-AC)

6.

Color Temperature

Medium

8,300

9,300

10,300

o

K

< Test Signal >

Cool

11,000

12,000

13,000

o

K

HDMI input, 

Warm

5,500

6,500

7,500

7,500

PSM : Dynamic

85% Full white pattern,

5MPCD

# White Peak brightness measure specification
1) In non-impressed condition , measure peak brightness displayable as much as possible LCD module.
2) Measuring instrument : CA-110 or a sort of Color Analyzer. 
3) Pattern Generator : VG-828 or a sort of digital pattern generator  (displayable Full White & 1/25 White Window pattern)
4) Measure condition

- Test pattern : in center, 1/5(H) * 1/5(V) of  Window Pattern (white pattern in non-impressed condition)
- SET condition : Contrast & Brightness Level 100%
- Environment condition : Dark room in the non outside light 

5) Measurement

- Do heat-run LCD module at 30 minutes in normal temperature (25°C) by using full white pattern of 15% signal level(38 gray)
- Impress test pattern signal in 1/5(H) * 1/5(V) White Window of 100%(255Gray Level)
- Measure 3 times brightness of central white window, and mark peak brightness in max brightness degree 
- Measure the same condition in video signal /RGB signal.

1) Impress 100%(255Gray Level) full white pattern at the same peak brightness measurement.
2) Measure average brightness in 9 points. 

1) Test display signal : 30*30 dots White Window signal & all Black Raster signal
2) Dark room measure condition : Using touch type Color analyzer CA-100 Dark room in the non outside light 
3) Bright room measure condition : In bright room of 150Lx illumination in the panel surface, locate a source of light on the above

45° of the panel surface.

4) Measure method

- In standard test condition, impress 30*30 dots White Window Pattern signal .

Measure center peak brightness degree Lw of white window

- Impress black Raster signal as contrast ratio measurement signal.

Measure black brightness degree Lb of PDP central 
Calculate the following numerical formula .