DOWNLOAD LG 26LH1DCX-UX / 26LH1DC3-UA / 26LH1DC4-UB / 26LH1DC5-UC Service Manual ↓ Size: 31.35 MB | Pages: 72 in PDF or view online for FREE

Model
26LH1DCX-UX 26LH1DC3-UA 26LH1DC4-UB 26LH1DC5-UC
Pages
72
Size
31.35 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
26lh1dcx-ux-26lh1dc3-ua-26lh1dc4-ub-26lh1dc5-uc.pdf
Date

LG 26LH1DCX-UX / 26LH1DC3-UA / 26LH1DC4-UB / 26LH1DC5-UC Service Manual ▷ View online

-9-
THD+N vs FREQ.
-LEFT
dBFs
-60
-RIGHT
-60
THD vs LEVEL
@-20dBFs
-LEFT
dBFs
-60
-RIGHT
-60
*DYNAMIC
RANGE
-65
-16BIT(L, R)
dB
-65
-18BIT(L, R)
-65
-20BIT(L, R)
*Dynamic Range Control (DRC) is originally the concept of Dolby Digital and used only in Dolby Digital.
But as a similar concept there is the Automatic Volume Correction in the analog TV, and it is used in the same menu 
because there is no possibility of conflict between the two.
Therefore, if you turn on the DRC in the menu, the DRC will be active in the digital TV and AVC will be active in the analog TV.
5. Signal Timing (Resolution)
5.1 Component Video Input (Y, CB/PB, CR/PR)
5.2 PC Mode (RGB)
No.
Resolution
H-freq.(kHz)
V-freq.(Hz)
Pixel Clock(MHz)
Proposed
1
640*350
31.469
70.087
25.17
EGA
2
720*400
31.469
70.087
28.32
DOS
3
640*480
31.469
59.94
25.175
VGA
4
640*480
37.5
75
31.5
VGA
5
640*480
43.269
85.008
36
VGA
6
800*600
37.879
60.317
40
SVGA
7
800*600
46.875
75
49.5
SVGA
8
800*600
53.674
85.061
56.25
SVGA
9
832*624
49.726
75.552
58.05
MAC
10
1024*768
48.363
60.004
65
XGA
11
1024*768
60.023
75.029
78.75
XGA
12
1024*768
68.677
84.997
94.5
XGA
13
1280*720
44.772
59.855
74.5
VESA
14
1360*768
47.72
59.799
84.75
VESA
15
720*480
31.5
60
31.5
SDTV, 480p
16
720*480
31.469
59.94
59.94
SDTV, 480p
17
1280*720
45
60
74.25
HDTV, 720p
18
1280*720
44.96
59.94
74.18
HDTV, 720p
19
1920*1080
33.75
60
74.25
HDTV, 1080i
20
1920*1080
33.72
59.94
74.18
HDTV, 1080i
No.
Resolution
H-freq.(kHz)
V-freq.(Hz)
Pixel Clock(MHz)
Proposed
1
720*480
15.75
60
13.51
SDTV, 480i
2
720*480
15.734
59.94
13.5
SDTV, 480i
3
720*480
31.5
60
27.03
SDTV, 480p
4
720*480
31.469
59.94
27
SDTV, 480p
5
1280*720
45
60
74.25
HDTV,720p
6
1280*720
44.96
59.94
74.18
HDTV,720p
7
1920*1080
33.75
60
74.25
HDTV,1080i
8
1920*1080
33.72
59.94
74.18
HDTV,1080i
-10-
5.3 DVI/HDMI Input : HDMI Ver1.2a
No.
Resolution
H-freq.(kHz)
V-freq.(Hz)
Pixel Clock(MHz)
Proposed
1
640*480
31.469
59.94
25.17
VGA
2
640*480
37.861
72.8
31.5
VGA
3
640*480
37.5
75
31.5
VGA
4
640*480
43.3
85
36
VGA
5
800*600
35.156
56.25
36
SVGA
6
800*600
37.879
60.31
40
SVGA
7
800*600
48.077
72.18
50
SVGA
8
800*600
46.875
75
49.5
SVGA
9
800*600
53.7
85
56.25
SVGA
10
1024*768
48.363
60
65
XGA
11
1024*768
56.476
70.06
75
XGA
12
1024*768
60.023
75.02
78.75
XGA
13
1024*768
68.7
85
94.5
XGA
14
1280*768
47.78
59.87
79.5
15
1360*768
47.72
59.8
84.75
16
720*400
31.43
70
27.28
DOS
17
720*480
15.75
60
27.03
SDTV, 480i
18
720*480
15.734
59.94
27
SDTV, 480i
19
720*480
31.5
60
31.5
SDTV, 480p
20
720*480
31.469
59.94
59.94
SDTV, 480p
21
1280*720
45
60
74.25
HDTV, 720p
22
1280*720
44.96
59.94
74.18
HDTV, 720p
23
1920*1080
33.75
60
74.25
HDTV, 1080i
24
1920*1080
33.72
59.94
74.18
HDTV, 1080i
-11-
ADJUSTMENT INSTRUCTION
1. Service Menu
To enter the Service Menu, press the MENU button of the TV SET for 
5 seconds while keeping the MENU key of the INSTALLER remote
controller pressed.
When using the Service Remote controller, press the “IN-START” or
“ADJ” to enter the Service Menu.
Use the channel UP/DOWN key to move between the items of the
Service Menu.
In the Service Menu, use the left and right key or volume key to adjust the
value in the Sub Item.
In the Service Menu, press ‘ENTER’ to return to the Main Item from the
Sub Item.
Press exit in the main item to end the Service Menu.
Unlike other OSD, the Service Menu does not have any Timeout Exit.
1.1 Service Menu Structure
System Reset – Confirm
Software Version
Chip I
2
C Test – Memory
FLASH
EEPROM
TUNER
VIDEO ADC
AUDIO DEC
Uart1 Comm.
Pillow Mode
Uart Mode
Aging Test
White Balance – Offset R
Offset G
Offset B
Gain R
Gain G
Gain B
YPbPr : offset/gain – Offset Y
Offset Pb
Offset Pr
Gain Y
Gain Pb
Gain Pr
Reset Mode
RGB : offset/gain – Offset R
Offset G
Offset B
Gain R
Gain G
Gain B
Reset Mode
Auto Picture – Auto Brightness
Auto Contrast
Running Time - Running Time
Reset Mode
System All Reset – Confirm
Audio Delay – DTV
ATV/CVBS/YC
COMP/PC/HDMI
Reset Mode
AI Control
Last Power Save
Panel Monitoring
Panel ID – Display ID
Panel Company ID
Model ID
Reserved
Commercial Flag
Panel Brightness
Epg Mode
SW Upgrade
EXIT
1.2 Service Menu Description
(1) System Reset :
When you press Confirm, the general NVRAM parameters excluding
the parameters of the service scope are initialized and self rebooted.
(This is mainly used after repairing or replacing the board to set to the
initial factory condition.)
(2) Software Version :
This shows you the information of the current Software Version.
The displayed information includes Version, Date, Model name and
Panel information.
(3) Chip I
2
C Test :
It shows you whether there is any issue in the HW of the major Device
on the Board at its basic level.
(4) Aging Test :
When you press Confirm, the service menu OSD temporarily
disappears and single color Pattern is displayed.
When you press ‘ENTER’ key, it returns to its original condition.
(5) White Balance :
Control the offset/gain of the final end of the Scaler to adjust the white
balance. The adjustment is done by controlling the each offset/gain of
R, G and B.
The Color temperature is adjusted during HDMI 720p Input based on
9800K
±
500 in 100% White pattern.
(Default : Offset R, G, B=50, 50, 50/Gain R, G, B = 50, 50, 50)
(6) YPbPr : offset/gain : Mst9883C Adjust
Calibrate the Offset/Gain of Mst9883(Video AD).
Because the deviation of Mst9883 is not significant, it does not need
separate calibration.
(Default : Offset Y, Pb, Pr=24, 51, 51/Gain Y, Pb, Pr = 60, 60, 60)
(7) RGB : offset/gain : RTD2023B Adjust
Calibrate the Offset/Gain of the Scaler for PC input process.
After connecting 16-gray or 32-gray pattern to RGB input and selecting
“RGB : offset/gain”, press ‘ENTER’ button on the remote controller.
When the “Reset Mode” is shown, press the right arrow key on the
remote controller to execute auto calibration.
Scaler checks the gray pattern of input and calibrates the offset and
gain automatically to show you the values.
(Default : Offset R, G, B=128, 128, 128/Gain R, G, B = 128, 128, 128)
(8) Auto Picture :
Adjust the range of brightness and contrast that applies to the
standard of Video Preset.
When you adjust this value, it gives the same effect to dynamic and
mild of Video Preset.
The Standard Brightness can be differently adjusted depending on the
characteristics of the Panel.
That is, for the panel characteristics with luminance value that cannot
be adjusted with Panel Brightness, it means that the Standard
Brightness of Auto Picture can be adjusted.
For more detail, refer the pages 12, item (17) Panel Brightness.
(9) Running Time :
The System shows the accumulated operating time the Power is
turned On.
When Reset, it is reset to 0.
-12-
(10) System All Reset :
It reboots itself after initializing not only the general NVRAM
Parameter but also Service Parameter.
(White Balance, YPbPr offset/gain, RGB offset/Gain etc.)
*** Therefore do not run System All Reset unless it is a special case.
If this item must be initialized, write down the adjusted value after
factory delivery of Panel brightness, Auto Picture, White Balance,
YPbPr offset/gain and RGB offset/Gain on paper then execute the
initialization.
Then after the execution, use the remote controller to re-enter the
written value without separate adjustment, and you can realize
the same TV quality.
(11) Audio Delay
Adjust the Audio Delay. The Group can be classified into 3 types.
- DTV Group
- ATV/CVBS/YC Group
- COMP/PC/HDMI Group
(12) AI Control :
This is the function to set ON/OFF to support the AI automatically in
the panel that supports the DCR(Dynamic Contrast Ratio) function.
*** The Default value is OFF and must be maintained at OFF without
separate notification.
(13) Last Power Save :
This is the item to set whether to save the Last Power.
(14) Panel Monitoring :
This is the item to set whether to use Panel Abnormal Detection
Monitoring.
(15) Panel ID :
This is the item to set the Panel ID.
You can set the Display ID, Panel Company ID and Model ID of the
Panel currently connected.
The Display ID is fixed to LCD and the Panel Company ID toggles
among LG, SAMSUNG and AUO.
When the Panel Company ID is decided, you must set the Model IT
accordingly.
(16) Commercial Flag :
This is the item to set whether to communicate with the Network
Board or operate Stand alone.
This must always be set to ON unless it is a special testing
environment.
(17) Panel Brightness :
This is the item to adjust the brightness of the panel.
The default set value is 70 and can be adjusted to between 1 and 100.
When the value is set to 1, it is the lowest value (20%) and when set to
100, it is the highest brightness (100%).
The PWM signal sent out from MICOM is converted to DC voltage to
adjust the brightness of the panel.
As a reference, the DC voltage value sent out from the board
according to the set value is as follows.
Under the condition of HDMI 1080i Input, Video mode : Standard,
Color temperature : Normal.
Set the generator signal source to Grays11/1080i30/HDMI (H8C).
Change to the HDMI input mode, observe the TV display screen.
Adjust the PANEL BRIGHT item of the TV SERVICE MENU, to make
the measured Bright Value of the CA-210 should be 25(cd/m
2
) in the
2nd bars from Left side of the GRAYS11 pattern on the TV display
screen.
If you couldn’t get the suitable Bright Value 25(cd/m
2
), adjust the
AUTO BRIGHT of the AUTO PICTURE item on the Service menu.
(18) Epg Mode :
This is the item to set the condition of Epg.
It Toggles among Mini, Full and None.
(19) SW Upgrade :
This is the item to Upgrade the Software using the RF Stream.
Send the stream with the Upgrade program to the desired channel
using the generator and setup as follows.
- RF Mode (Air or Cable) selection : For the remote controller,
press left/right to select 0(Air) or 1(Cable).
- RF Freq : Select the channel number with the stream.
- FE Mode(VSB/64QAM/256QAM) : Use the left/right button of the
remote controller to select 0(VSB), 1(64QAM) or 2(256QAM).
But you must not set 64QAM/256QAM for Air.
After completing the all the settings, select upgrade start to start the
upgrade.
When all the upgrade is normally completed, the system will
automatically reboot. Even if it fails, you must turn the power off and
then turn it back on to return to its normal condition.
(20) EXIT
Exit the Service Menu.
Set Point
Output DC Voltage(V)
1
0.210
10
0.345
20
0.520
30
0.715
40
0.945
50
1.215
60
1.530
70
1.850
80
2.200
90
2.630
100
3.170
Page of 72
Display

Click on the first or last page to see other 26LH1DCX-UX / 26LH1DC3-UA / 26LH1DC4-UB / 26LH1DC5-UC service manuals if exist.