DOWNLOAD LG 42LH30 (CHASSIS:LA92A) Service Manual ↓ Size: 5.99 MB | Pages: 31 in PDF or view online for FREE

Model
42LH30 (CHASSIS:LA92A)
Pages
31
Size
5.99 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lh30-chassis-la92a.pdf
Date

LG 42LH30 (CHASSIS:LA92A) Service Manual ▷ View online

- 7 -
5. Chroma & Brightness
No
Item
Min.
Typ.
Max.
Unit
Remark
1
Max Luminance
400
500
cd/m
2
(Center 1-point / Full White Pattern)
2
White average brightness
cd/m
2
N/A
3
Luminance uniformity
77
%
Full white
4
Color coordinate
RED
X
0.638
± 0.03
Y
0.334
± 0.03
GREEN
X
0.290
± 0.03
Y
0.606
± 0.03
BLUE
X
0.144
± 0.03
Y
0.064
± 0.03
WHITE
X
0.279
± 0.03
Y
0.292
± 0.03
6
Contrast ratio
1000:1
1400:1
30000:1
50000:1(DCR)
7
Color Temperature
Cool
0.274
0.276
0.278
** The W/B Tolerance is
0.281
0.283
0.285
±0.015 for Adjustment
Medium
0.283
0.285
0.287
0.291
0.293
0.295
Warm
0.311
0.313
0.315
0.327
0.329
0.331
6.  Component Video Input  (Y, C
B
/P
B
, C
R
/P
R
)  
No.
Specification            
Remark
Resolution H-freq(kHz)
V-freq(Hz)
Pixel 
clock
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
31.50
60
27.027
SDTV 
480P
4. 720*480
31.47
59.94
27.0
SDTV 
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
23.976
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
- 8 -
No. Specification 
Remark 
Resolution H-freq(kHz) 
V-freq(Hz)
Pixel 
clock(MHz)
PC
DDC
1
640*350
31.469
70.08
25.17
DOS
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
59.87
79.50
CVT(WXGA)
X
7
1360*768
47.720
59.799
84.75
CVT(WXGA)
O
8
1366*768
47.13
59.65
72
X
7. RGB input (PC)
8. HDMI input (PC/DTV)
No. Resolution
H-freq(kHz)  V-freq(Hz)
Pixel 
clock(MHz)
Remark
PC
DDC
1. 640*350
31.469
70.08
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. 720*400
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
59.87
79.50
CVT(WXGA)
O
7. 1360*768
47.720
59.799
84.75
CVT(WXGA)
O
DTV
1
720*480
31.5
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
23.976
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
1. Application Object
This specification sheet applied to LA92A Chassis applied
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.
(2) Adjustments must be done in the correct order.
(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.
(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.
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,. 
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.
3. Adjustment items
3.1. Main PCB check process
- Adjust 480i Comp1
- 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.
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)
3.3 Etc
- Ship-out mode
- 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.
(2) Equipment & Condition
1) Jig (RS-232C protocol)
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
(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.
- 9 -
ADJUSTMENT INSTRUCTION
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
(2) Confirmation
1) We confirm whether “0xBF(480i)/0xC8(1080i)” address
of EEPROM “0xA2” is “0xAA” or not.
2) If “0xBF(480i)/0xC8(1080i)” address of EEPROM “0xA2”
isn’t “0xAA”, we adjust once more.
3) We can confirm the ADC values from “0xB ~0xBE(480i)/
0xC2~(1080i)” addresses in a page “0xA2”.
* Manual ADC Confirmation using Service Remocon. After
enter Service Mode by pushing “INSTART” key.
5. Manual Adjustment
5.1. ADC(Saturn5) 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.
(2) Equipment & Condition
1) Adjust Remocon
2) 801GF(802B, 802F, 802R) or MSPG925FA Pattern
Generator
- Resolution: 480i, 1024*768
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level: 0.7±0.1 Vp-p
- Image
3) Must use standard cable
(3) Adjust method
• ADC 480i Comp1
1) Check connected condition of Comp1 cable to the
equipment
2) Give a 480i Mode, Horizontal 100% Color Bar Pattern
to Comp1.
(MSPG-925FA Ë Model: 209, Pattern: 65)
3) Change input mode as Component1 and picture mode
as “Standard”
4) Press the In-start Key on the ADJ remote after at least
1 min of signal reception. Then, select 7. External ADC
-> 1. COMP 480i on the menu. Press enter key. The
adjustment will start automatically.
5) If ADC calibration is successful, “ADC RGB Success”
is displayed.
If ADC calibration is failure, “ADC RGB Fail” is
displayed.
6) If ADC calibration is failure, after recheck ADC pattern
or condition retry calibration. Error message refer to (v)
• ADC 1024*768 RGB
1) Check connected condition of Component & RGB
cable to the equipment
2) Give a 1024*768 Mode, 100% Horizontal Color Bar
Pattern to RGB port. 
(MSPG-925 Series Ë model:60 , pattern:65 )
3) Change input mode as RGB and picture mode as
“Standard”
4) Press the In-start Key on the ADJ remote after at least
1 min of signal reception. Then, select 7. External ADC
-> 1. COMP 480i on the menu. Press enter key. The
adjustment will start automatically.
5) If ADC calibration is successful, “ADC RGB Success”
is displayed.
If ADC calibration is failure, “ADC RGB Fail” is
displayed.
6) If ADC calibration is failure, after recheck ADC pattern
or condition retry calibration
Error message refer to 5)
5.2. EDID(The Extended Display Identification
Data)/DDC(Display Data Channel) download
Reference : Download is only possible in POWER ONLY
MODE
(1) Overview
It is a VESA regulation. A PC or a MNT will display an
optimal resolution through information sharing without any
necessity of user input. It is a realization of “Plug and Play”.
(2) Equipment
- Since embedded EDID data is used, EDID download JIG,
HDMI cable and D-sub cable are not need.
- Adjust remocon
(3)Download method
1) Press Adj. key on the Adj. R/C,
2) Select EDID D/L menu.
3) By pressing Enter key, EDID download will begin
4) If Download is successful, OK is display, but If
Download is failure, NG is displayed.
5) If Download is failure, Re-try download.
Caution) When EDID download, must remove RGB/HDMI cable.
(4) EDID DATA
1) HDMI 1 [C/S: XXBA]
- EDID Block 0  table =
- 10 -
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
02
00
01
01
01
01
10
XX
XX
01
03
80
73
41
78
0A
CF
74
A3
57
4C
B0
23
20
09
48
4C
A1
08
00
A9
40
81
80
61
40
45
40
31
40
30
01
01
01
01
01
01
02
3A
80
18
71
38
2D
40
58
2C
40
45
00
7E
8A
42
00
00
1E
01
1D
00
72
51
D0
1E
20
50
6E
28
55
00
7E
8A
42
00
00
1E
00
00
00
FD
00
39
60
3F
1F
52
10
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
XX
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