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How to Test LCD screen

What are the common problems on LCD screen?
Before we start to test LCD screen, we should know what the commom symptoms that LCD screens have:
Cracked on LCD Screen - Physical Damaged
Scratch on LCD Screen – Physical Damaged
Lines on LCD Screen
Color Uniformity
Pressured Mark on LCD Screen
Dead Pixel on LCD Screen
We can quickly identify those have physical damaged LCD screens by vision inspection.
But for the LCD screens that have lines, pressured mark, dead pixel and other issues, we do need to turn on LCD screen and apply few difference color background page to identify these issues.
How to use test pages
We had created a few simply pages for you to be easily identify the symtoms:
Verical lines, Horizon lines
Color uniformity
Pressured mark, Dead pixel.
By changing from Red , Green and Blue, you can easily identify fine vertical lines, horizontal line and color uniformity issues on screen. By changing from Full white to Full Black, you can easily identify fine Pressured Mark and other issued on LCD screen
It is available online at
Press F11 for full page display
LCD Screen Testers - LS02 and LST03
Our LCD Screen Tester (LST02 and LST03) are custom design to test LVDS LCD screens up to 42 inch. By setting a dip switch, panel B+ and panel wire harness. It allows you to apply any test pattern through VGA input and test all types of specification on the LCD screen and LED Screen. In addition, a custom design Inverter allows you to test any given number of CCFL back light lamp up to 4 at the time.
How to set up LCD Screen Tester
  • Identify Makes and part number of the LCD screen
  • Choose a correct wire harness and setting according to Cross Table below*
  • Apply setting to Dip switch and Panel B+
  • Connect screen wire harness between Tester and LCD screen
  • Connect LCD screen's CCFL to Tester
  • Apply Input Signal to VGA
  • Connect 12V DC to Tester and Turn it on
LST02 Cross reference table

LST03 Corss reference table

Please visit our testing page at change to difference color to identify lines, pressured mark and dead pixel.
Press F11 for full page display
Note: 12V DC jack MUST be disconnect and re-connect it back to LST02/LST03 for new setting to be effective. 12V DC Jack MUST disconnect before switch to test another LCD screen.
TST01 – custom build for testing 4 wires, 5 wires and 8 wires resistive touch screen.
LCD screen tester (for testing eDP/embedded Display Port interface). With its built-in Color bar generator, it can test resolution from 1280X800 to 3840X2160.
Testing LED Strip without Disassembly. IT03 can test all LED strips from a smaller industrial screen and up to 70 inch TV screen.
No more guess works!
LST01 is a custom build tester for Laptop screen repair; it can help you to isolate the problem between CCFL Backlight Lamp and Inverter in seconds.
Save Time! Save money!
LST04 - No setup time
Small and compact, easy to use, with build-in Color bar generator, you can test LCD screen size up to 60”
IT01 is design to test multiple backlight lamps inverter; it is capable to test any type of inverter up to 6 lamps at the time!
Stand alone Inverter tester!
The advantage of this custom build tester is that, you can apply any input voltage through DC Jack to test inverter from Laptop to LCD TV inverter.
UB Series LED Backlight
UB series are the direct replacement for Industrial LCD screens that were originally equipped with dual or 4 CCFL backlight lamps.
LCD Controller
These LCD Controller kits are designed to be easily integrated into the LCD screens that they are commonly used in kiosks, POS, avionics, Vending machine, Digital Signage and all other applications.
Retrofit LCD monitorfor MDT962B-1A

Retrofit LCD monitor for Mazak DR-5614

Sunlight Readable SKD kit
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