LG 32CL20-UA (CHASSIS:LA92A) Service Manual ▷ View online
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7. Chroma& Brightness
7.1 Module optical specification
7.2Max Luminance &Contrast measure standard specification
- Max Luminance measure specification
1) In non-impressed condition, measure peak brightness displayable as much as possible LCD module.
2) Measuring instrument: CA-210 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
• Video menu option condition
1) In non-impressed condition, measure peak brightness displayable as much as possible LCD module.
2) Measuring instrument: CA-210 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
• Video menu option condition
5) Measurement
• Do heat-run LCD module at 30minutes in normal temperature (25°C)by using full white pattern of 15%signal level(38 gray level).
• 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.
• Do heat-run LCD module at 30minutes in normal temperature (25°C)by using full white pattern of 15%signal level(38 gray level).
• 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.
- Luminance uniformity measure specification
1) Impress 100%(255Gray Level) full white pattern at the same peak brightness measurement.
2) Measure average brightness in 5 points.
1) Impress 100%(255Gray Level) full white pattern at the same peak brightness measurement.
2) Measure average brightness in 5 points.
Signal
Picture Mode
Dynamic Contrast
Dynamic Color
Black Level
OPC
RF
NTSC-M
Vivid
High High Low
Off
AV NTSC-J Vivid
High
High High
Off
Component 720P
Vivid
High
High
High
Off
RGB 1024x768
Vivid
High
NA
NA
Off
HDMI DTV
720P
Vivid
High
High
Low
Off
No.
Item Specification
Min.
Typ.
Max.
Remark
1.
Max Luminance
Modele
400
500
cd/m2
(Center1-point/ Ful white pattern)
2.
Luminance uniformity
Luminance
77
3. Contrast Ratio
1000: 1
1300: 1
40000: 1(DCR) 50000:1(DCR)
4.
Color Coordinates
WX
Typ
0.279
Typ
White
WY
-0.03
0.292
+0.03
Xr
0.639
RED
Yr
0.333
Xg 0.292
Green
Yg 0.604
Xb 0.145
Blue
Yb
0.062
5. Color
Temperatue
Cool
Typ
0.276
Typ
85% Full white pattern
-0.015
0.283
+0.015
**The W/B Tolerance is
Medium
0.285
± 0.015 for Adjustment
0.293
Dynamic contrast :off
Warm
0.313
Dynamic color :off
0.329
Energy saving mode :off
6.
Color Distortion, DG
10.0
%
7.
Color Distortion,DP
10.0 deg
8.
Color S/N,AM/FM
43.0
dB
9.
Color Killer Sensitivity
-80
dB
- 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
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 .
• 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
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
by IEC61988-2/CD,JAPAN EIAJ-2710
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A: H/ 4mm
B: V/ 4mm
@ H,V: Active Area
B: V/ 4mm
@ H,V: Active Area
8. Component Video Input (Y, C
B
/P
B
, C
R
/P
R
)
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
- 10 -
No
Specification
Remark
DDC
Resolution
H-freq(kHz)
V-freq(Hz)
Pixel Clock(MHz)
1.
640*350 31.468 70.09
25.17
EGA
X
2.
720*400 31.469 70.08
28.32
DOS
O
3.
640*480 31.469 59.94
25.17
VESA(VGA)
O
4.
800*600 37.879 60.31
40.00
VESA(SVGA)
O
5.
1024*768 48.363
60.00
65.00
VESA(XGA)
O
6.
1280*768
47.776
59.870 79.5
CVT(WXGA)
X
7.
1360*768 47.712
60.015
85.50
VESA
(WXGA)
X
8.
1280*1024
63.981
60.020
108.00 VESA
(SXGA)
O
9.
1600*1200
75.00
60.00 162
VESA
(UXGA)
O
10.
1920*1080
66.587 59.934 148.5
HDTV
1080P
O
9. RGB
9
.1 PC INPUT
10. HDMI Input (PC/DTV)
10.1 PC Mode
No
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
Remark
1 640*350
31.468
70.09
25.17
EGA
2 720*400
31.469
70.08
28.32
DOS
3 640*480
31.469
59.94
25.17
VESA(VGA)
4 800*600
37.879
60.31
40.00
VESA(SVGA)
5
1024*768
48.363 60.00
65.00
VESA(XGA)
6 1280*768
47.776
59.870
79.5
CVT(WXGA)
7 1360*768
47.712
60.015
85.50
VESA
(WXGA)
8 1280*1024
63.981
60.020
108.00
VESA
(SXGA)
9 1600*1200
75.00
60.00
162
VESA
(UXGA)
10
1920*1080 67.5
60
148.5
HDTV
1080P
10.2 DTV Mode
No
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
Remark
1 720*480
31.47
60
27.027
SDTV
480P
2 720*480
31.47
59.94
27.00
SDTV
480P
3 1280*720
45.00
60.00
74.25
HDTV
720P
4 1280*720
44.96
59.94
74.176
HDTV
720P
5
1920*1080 33.75 60.00 74.25
HDTV
1080I
6
1920*1080 33.72 59.94 74.176
HDTV
1080I
7
1920*1080 67.500
60
148.50
HDTV
1080P
8 1920*1080
67.432
59.939
148.352
HDTV
1080P
9 1920*1080
27.000
24.000
74.25
HDTV
1080P
10
1920*1080 26.97 23.94
74.176
HDTV
1080P
11
1920*1080 33.75
30.000
74.25
HDTV
1080P
12 1920*1080
33.71
29.97
74.176
HDTV
1080P
- 11 -
ADJUSTMENT INSTRUCTION
1. Application Object
This specification sheet applied to LA92A Chassis applied
LCD TV all models manufactured in TV factory.
LCD TV all models manufactured in TV factory.
2. Notes
(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 equipment.
transformer will help protect test equipment.
(2) Adjustments must be done in the correct order.
(3) The adjustments must be performed in the circumstance of
(3) The adjustments must be performed in the circumstance of
20±5°C of temperature and 65±10% of relative humidity if
there is no specific designation.
there is no specific designation.
(4) The input voltage of the receiver be must kept 100V-240V,
50/60Hz when adjusting.
(5) The receiver must be operated for about 5 minutes prior to
the adjustment when module is in the circumstance of over
15.
15.
In case of keeping module is in the circumstance of 0°C, it
should be placed in the circumstance of above 15°C for 2
hours
In case of keeping module is in the circumstance of below -
20°C, it should be placed in the circumstance of above
15°C for 3 hours,.
should be placed in the circumstance of above 15°C for 2
hours
In case of keeping module is in the circumstance of below -
20°C, it should be placed in the circumstance of above
15°C for 3 hours,.
Caution : When still image is displayed for a period of 20
minutes or longer (especially where W/B scale is strong.
Digital pattern 13ch and/or Cross hatch pattern 09ch),
there can some afterimage in the black level area.
minutes or longer (especially where W/B scale is strong.
Digital pattern 13ch and/or Cross hatch pattern 09ch),
there can some afterimage in the black level area.
3. Adjustment items
3.1. Main PCB check process
- Adjust 480i Comp1
- Adjust 1024*768 RGB
- Adjust 1024*768 RGB
Above adjustment items can be also performed in Final
Assembly if needed. Both Board-level and Final assembly
adjustment items can be check using In-Star Menu 1.ADJUST
CHECK.
Assembly if needed. Both Board-level and Final assembly
adjustment items can be check using In-Star Menu 1.ADJUST
CHECK.
3.2. Final assembly adjustment
- EDID/DDC download
- White Balance adjustment
- RS-232C functionality check
- Factory Option setting per destination
- Ship-out mode setting (In-Stop)
- White Balance adjustment
- RS-232C functionality check
- Factory Option setting per destination
- Ship-out mode setting (In-Stop)
3.3 Etc
- Ship-out mode
- Service Option Default
- USB Download(S/W Update, Option, Service only)
- ISP Download(Option)
- Service Option Default
- USB Download(S/W Update, Option, Service only)
- ISP Download(Option)
4. Automatic Adjustment
4.1. ADC Adjustment
(1) Overview
ADC adjustment is needed to find the optimum black level
and gain in Analog-to-Digital device and to compensate
RGB deviation.
and gain in Analog-to-Digital device and to compensate
RGB deviation.
(2) Equipment & Condition
1) Jig (RS-232C protocol)
2) MSPG-925 Series Pattern Generator(MSPG-925FA)
2) MSPG-925 Series Pattern Generator(MSPG-925FA)
- Resolution : 480i Comp1 (MSPG-925FA: model-209,
pattern-65)
1024*768 RGB (MSPG-925FA: model-60 , pattern-65)
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7±0.1 Vp-p
- Image
- Pattern level : 0.7±0.1 Vp-p
- Image
(3) Adjustment
1) Adjustment method
- Using RS-232, adjust items listed in 3.1 in the other
shown in “4.1.3.3”
2) Adj. protocol
Ref.) ADC Adj. RS232C Protocol_Ver1.0
3) Adj. order
- aa 00 00 [Enter ADC adj. mode]
- xb 00 40 [Change input source to Component1(480i)]
- ad 00 10 [Adjust 480i Comp1]
- xb 00 60 [Change input source to RGB(1024*768)]
- ad 00 10 [Adjust 1024*768 RGB]
- ad 00 90 End adj.
- xb 00 40 [Change input source to Component1(480i)]
- ad 00 10 [Adjust 480i Comp1]
- xb 00 60 [Change input source to RGB(1024*768)]
- ad 00 10 [Adjust 1024*768 RGB]
- ad 00 90 End adj.
Protocol
Command
Set ACK
Enter adj. mode
aa 00 00
a 00 OK00x
Source change
xb 00 40
b 00 OK40x (Adjust 480i Comp1 )
xb 00 60
b 00 OK60x (Adjust 1024*768 RGB)
Begin adj.
ad 00 10
Return adj. result
OKx (Case of Success)
NGx (Case of Fail)
Read adj. data
(main)
(main)
ad 00 20
000000000000000000000000007c007b006dx
(sub)
(Sub)
ad 00 21
000000070000000000000000007c00830077x
Confirm adj.
ad 00 99
NG 03 00x (Fail)
NG 03 01x (Fail)
NG 03 02x (Fail)
OK 03 03x (Success)
End adj.
aa 00 90
a 00 OK90x
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