26LH1DCX-UX, 26LH1DC3-UA, 26LH1DC4-UB, 26LH1DC5-UC - LG TV Service Manual (repair manual). Page 11

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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.

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) 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.