LG 42LH20FD (CHASSIS:LT91A) Service Manual ▷ View online
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No.
Specification
Remark
Resolution
H-freq(kHz)
V-freq(Hz)
Pixel clock(MHz)
Proposed
1.
720*400
31.468
70.08
28.321
For only DOS mode
2.
640*480
31.469
59.94
25.17
VESA
Input 848*480 60Hz, 852*480 60Hz
-> 640*480 60Hz Display
3.
800*600
37.879
60.31
40.00
VESA
4.
1024*768
48.363
60.00
65.00
VESA(XGA)
5.
1280*768
47.78
59.87
79.5
WXGA
6.
1360*768
47.72
59.8
84.75
WXGA
7.
1280*1024
63.595
60.0
108.875
SXGA
FHD model
8.
1920*1080
66.587
59.93
138.625
WUXGA
FHD model
8. RGB input (PC)
9. HDMI input (PC/DTV)
No.
Resolution
H-freq(kHz)
V-freq(Hz)
Pixel clock(MHz)
Remark
PC
1.
720*400
31.468
70.08
28.321
HDCP
2.
640*480
31.469
59.94
25.17
VESA HDCP
3.
800*600
37.879
60.31
40.00
VESA HDCP
4.
1024*768
48.363
60.00
65.00
VESA(XGA)HDCP
5.
1280*768
47.78
59.87
79.5
WXGA HDCP
6.
1360*768
47.72
59.8
84.75
WXGA HDCP
7.
1280*1024
63.595
60.0
108.875
SXGA HDCP
8.
1920*1080
67.5
60
148.5
WUXGA HDCP
DTV
1.
720*480
31.469 /31.5
59.94 /60
27.00/27.03
SDTV 480P
2.
720*576
31.25
50
54
SDTV 576P
3.
1280*720
37.500
50
74.25
HDTV 720P
4.
1280*720
44.96 /45 5
9.94 /60
74.17/74.25
HDTV 720P
5.
1920*1080
33.72 /33.75
59.94 /60
74.17/74.25
HDTV 1080I
6.
1920*1080
28.125
50.00
74.25
HDTV 1080I
7.
1920*1080
26.97 /27
23.97 /24
74.17/74.25
HDTV 1080P
8.
1920*1080
33.716 /33.75
29.976 /30.00
74.25
HDTV 1080P
9.
1920*1080
56.250
50
148.5
HDTV 1080P
10.
1920*1080
67.43 /67.5
59.94 /60
148.35/148.50
HDTV 1080P
1. Application
This spec sheet is applied all of the LCD TV with LT91A
chassis.
chassis.
2. Designation
(1) The adjustment is according to the order which is
designated and which must be followed, according to the
plan which can be changed only on agreeing.
plan which can be changed only on agreeing.
(2) Power adjustment : Free Voltage.
(3) Magnetic Field Condition: Nil.
(4) Input signal Unit: Product Specification Standard.
(5) Reserve after operation: Above 5 Minutes (Heat Run)
(3) Magnetic Field Condition: Nil.
(4) Input signal Unit: Product Specification Standard.
(5) Reserve after operation: Above 5 Minutes (Heat Run)
Temperature : at 25 °C ±5 °C
Relative humidity : 65 ±10%
Input voltage : 220V, 60Hz
Relative humidity : 65 ±10%
Input voltage : 220V, 60Hz
(6) Adjustment equipments : Color Analyzer (CA-210 or CA-
110), Pattern Generator (MSPG-925L or Equivalent), DDC
Adjustment Jig equipment, SVC remote controller.
Adjustment Jig equipment, SVC remote controller.
(7) Push The “IN STOP KEY” – For memory initialization.
3.Main PCB check process
# APC - After Manual-Insert, executing APC
3.1 Boot file Download
1. Execute ISP program “Mstar ISP Utility” and then click
“Config” tab.
2. Set as below, and then click “Auto Detect” and check “OK”
message
If “Error” is displayed, Check connection between computer,
jig, and set.
If “Error” is displayed, Check connection between computer,
jig, and set.
3. Click “Read” tab, and then load download file (XXXX.bin) by
clicking “Read”
4. Click “Connect” tab. If “Can’t ” is displayed, Check
connection between computer, jig, and set.
5. Click “Auto” tab and set as below
6. Click “Run”.
7. After downloading, check “OK” message.
6. Click “Run”.
7. After downloading, check “OK” message.
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ADJUSTMENT INSTRUCTION
Case1 : Software version up
1. After downloading S/W by USB , TV set will reboot
automatically
2. Push “In-stop” key
3. Push “Power on” key
4. Function inspection
5. After function inspection, Push “In-stop” key.
3. Push “Power on” key
4. Function inspection
5. After function inspection, Push “In-stop” key.
Case2 : Function check at the assembly line
1. When TV set is entering on the assembly line, Push “In-
stop” key at first.
2. Push “Power on” key for turning it on.
-> If you push “Power on” key, TV set will recover channel
information by itself.
3. After function inspection, Push “In-stop” key.
(4)
filexxx.bin
(1)
(3)
(2)
OK
Please Check the Speed :
To use speed between
from 200KHz to 400KHz
filexxx.bin
(7)
(5)
(8) ……….OK
(6)
3.2 USB DOWNLOAD(*.epk file download)
1. Put the USB Stick to the USB socket
2. Automatically detecting update file in USB Stick
2. Automatically detecting update file in USB Stick
- If your downloaded program version in USB Stick is Low, it
didn’t work.
But your downloaded version is High, USB data is
automatically detecting
automatically detecting
3. Show the message “Copying files from memory”
4. Updating is staring.
5. Updating Completed, The TV will restart automatically.
6. If your TV is turned on, check your updated version and Tool
6. If your TV is turned on, check your updated version and Tool
option. (explain the Tool option, next stage)
* If downloading version is more high than your TV have, TV
can lost all channel data. In this case, you have to
channel recover. if all channel data is cleared, you didn’t have
a DTV/ATV test on production line.
a DTV/ATV test on production line.
* After downloading, have to adjust TOOL OPTION again.
1. Push "IN-START" key in service remote controller.
2. Select "Tool Option 1" and Push “OK” button.
3. Punch in the number. (Each model has their number.)
2. Select "Tool Option 1" and Push “OK” button.
3. Punch in the number. (Each model has their number.)
4. Completed selecting Tool option.
3.3 ADC Process
3.3.1 ADC
• Input signal : Component
• Signal equipment displays.
• Signal equipment displays.
Adjustment pattern
-Component 480I
MODEL: 209 in Pattern Generator(480i Mode)
PATTERN : 65 in Pattern Generator( MSPG-925 SERISE)
PATTERN : 65 in Pattern Generator( MSPG-925 SERISE)
• Input Signal : RGB (You don’t need to connect RGB Cable)
Because We use TV internal pattern
” key at “5. ADC
Calibration”
* Caution
Using ‘power on’ button of the Adjustment R/C , power on TV.
3.3.2 ADC Calibration Protocol (RS232)
* Adjustment can be done using only external ADC
* Required equipment : Adjustment R/C.
* Required equipment : Adjustment R/C.
3.4 Function Check
3.4.1 Check display and sound
• Check Input and Signal items. (cf. work instructions)
1. TV
2. AV (SCART1/SCART2/CVBS)
3. COMPONENT (480i)
4. RGB (PC : 1024 x 768 @ 60hz)
5. HDMI
6. PC Audio In
2. AV (SCART1/SCART2/CVBS)
3. COMPONENT (480i)
4. RGB (PC : 1024 x 768 @ 60hz)
5. HDMI
6. PC Audio In
* Display and Sound check is executed by Remote controller.
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Tool Option
1
2
3
4
42LH20FD
24641
1572
676
4352
NO
Item
CMD1 CMD2
Data0
Data1
1
Main total mode
A
A
0
0
0
0
2
Change to Component
X
B
0
0
4
0
3 Adjust Component
A
D
0
0
1
0
4 Change to RGB
X
B
0
0
6
0
5 Adjust RGB
A
D
0
0
1
0
4. Total Assembly line process
4.1 Adjustment Preparation
• W/B Equipment condition
CA210 : CH 9, Test signal : Inner pattern (85IRE)
• Above 5 minutes H/run in the inner pattern. (Power on” key of
adjust remote control)
- Connecting picture of the measuring instrument
(On Automatic control )
Inside PATTERN is used when W/B is controlled. Connect to
auto controller or push Adjustment
R/C POWER-ON -> Enter the mode of White-Balance, the
auto controller or push Adjustment
R/C POWER-ON -> Enter the mode of White-Balance, the
pattern will come out.
4.1.1 Auto-control interface and directions
1. Adjust in the place where the influx of light like floodlight
around is blocked. (illumination is less than 10ux).
2. Adhere closely the Color Analyzer ( CA210 ) to the module
less than 10cm distance, keep it with the surface of the
Module and Color Analyzer’s Prove vertically.(80~100°).
Module and Color Analyzer’s Prove vertically.(80~100°).
3. Aging time
- After aging start, keep the power on (no suspension of power
- After aging start, keep the power on (no suspension of power
supply) and heat-run over 15 minutes.
- Using ‘no signal’ or ‘full white pattern’ or the others, check the
back light on.
** Caution **
Color Temperature : COOL, Medium, Warm.
One of R Gain/G Gain/ B Gain should be kept on 0xC0, and
adjust other two lower than C0.
(when R/G/B Gain are all C0, it is the FULL Dynamic Range of
Module)
Color Temperature : COOL, Medium, Warm.
One of R Gain/G Gain/ B Gain should be kept on 0xC0, and
adjust other two lower than C0.
(when R/G/B Gain are all C0, it is the FULL Dynamic Range of
Module)
*Manual W/B process using adjusts Remote control.
• After enter Service Mode by pushing “ADJ” key,
• Enter White Balance by pushing “•” key at “3. White Balance”.
• Enter White Balance by pushing “•” key at “3. White Balance”.
* After done all adjustments, Press “In-start” button and compare
Tool option and Area option value with its BOM, if it is correctly
same then unplug the AC cable.
same then unplug the AC cable.
If it is not same, then correct it same with BOM and unplug AC
cable.
For correct it to the model’s module from factory JIG model.
cable.
For correct it to the model’s module from factory JIG model.
* Push The “IN STOP KEY” after completing the function
inspection.
4.2 DDC EDID Write (RGB 128Byte )
• Connect D-sub Signal Cable to D-Sub Jack.
• Write EDID DATA to EEPROM (24C02) by using DDC2B
• Write EDID DATA to EEPROM (24C02) by using DDC2B
protocol.
• Check whether written EDID data is correct or not.
* For SVC main Ass’y, EDID have to be downloaded to Insert
Process in advance.
Process in advance.
4.3 DDC EDID Write (HDMI 256Byte)
• Connect HDMI Signal Cable to HDMI Jack.
• Write EDID DATA to EEPROM(24C02) by using DDC2B
• Write EDID DATA to EEPROM(24C02) by using DDC2B
protocol.
• Check whether written EDID data is correct or not.
* For SVC main Ass’y, EDID have to be downloaded to Insert
Process in advance.
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Cool
11,000k
K
X=0.276
(±0.002)
Y=0.283
(±0.002)
Medium
9,300k
K
X=0.285
(±0.002)
Y=0.293
(±0.002)
Color
Temperature
Warm
6,500k
K
X=0.313
(±0.002)
Y=0.329
(±0.002)
<Test Signal>
Inner pattern
(216gray,85IRE)
C O L O R
A N A LY Z E R
T Y P E : C A - 1 0 0
A N A LY Z E R
T Y P E : C A - 1 0 0
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