47LH55 (CHASSIS:LA92B) - LG TV Service Manual (repair manual). Page 9

- Contrast ratio measure specification
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-210 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

45º 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.
Contrast ratio =Lw /Lb

If it does not use Prior measurement, use generally simple test measurement. The Correct measure specification is followed
by IEC61988-2/CD,JAPAN EIAJ-2710

- 9 -

A: H/ 4mm
B: V/ 4mm
@ H,V: Active Area

No

Specification

Remark

Resolution

H-freq(kHz)

V-freq(Hz)

Pixel Clock(MHz)

1.

720*480 

15.73 

60 

13.5135 

SDTV ,DVD 480I

2.

720*480 

15.73 

59.94 

13.5 

SDTV ,DVD 480I

3.

720*480 31.47 

60 

27.027 

SDTV 

480P

4.

720*480 31.47

59.94 

27.0 

DTV 

480P

5.

1280*720 45.00 

60.00 

74.25 

HDTV 

720P

6.

1280*720

44.96

59.94

74.176

HDTV 720P

7.

1920*1080 33.75

60.00 

74.25

HDTV 

1080I

8.

1920*1080

33.72

59.94

74.176

HDTV 1080I

9.

1920*1080

67.500

60

148.50

HDTV 1080P

10.

1920*1080

67.432 59.939 148.352

HDTV 

1080P

11.

1920*1080 27.000

24.000

74.25

HDTV 

1080P

12.

1920*1080

26.97

23.94

74.176 HDTV 

1080P

13.

1920*1080

33.75 30.000 

74.25

HDTV 

1080P

14.

1920*1080 33.71

29.97

74.176

HDTV 

1080P