Free tool
Screen test for TVs and monitors
Check for dead pixels, dark zones from failing LED strips, backlight bleed, sharpness, motion, speakers and your remote — right in the browser of your TV, computer or phone. Nothing to install.
Before you start
- 01
Switch the TV or monitor on 15–30 minutes earlier so the backlight settles.
- 02
Wipe the screen — dust on a white background looks like a dead pixel.
- 03
Darken the room: clouding, bleed and dark zones show up best that way.
- 04
Turn off “Eco”, “Dynamic” and auto brightness — they change the picture during the test.
- 05
On a TV, open tv-servis.com/en/test in the built-in browser (Internet, Web Browser).
What you can check
Click a test to start from it. All tests run in one sequence — use the arrows to move on.
Coming soon: app for Samsung, LG and Android TV
We are preparing a free app with the same tests for Samsung (Tizen), LG (webOS) and Android / Google TV, plus a test-pattern video on YouTube.
Frequently asked questions
How do I recognise a dead pixel?
On white, red, green and blue backgrounds a dead pixel is a black dot that never changes. A stuck pixel is permanently lit in one colour (red, green, blue or white) and is easiest to see on black. A stuck pixel sometimes recovers with the “Stuck pixel fixer” tool; a dead one does not.
I see dark bands or darker corners on the grey screen. What is it?
Most often weak or failed LED backlight strips. The fault usually gets worse: the picture turns darker, bluish, then disappears while the sound still works. Replacing LED strips is one of the most common repairs we do and costs far less than a new TV.
Are a few dead pixels grounds for a warranty claim?
It depends on the manufacturer and panel class — most allow a small number of faulty pixels before a unit counts as defective. Check your model's warranty terms; this test helps you find and count them before the warranty runs out.
Does the test work on a TV?
Yes, in the browser of Samsung, LG, Android and Google TV sets. Use the arrow keys and OK on the remote; Back exits. TV browsers often run below the panel's resolution, so for pixel-exact sharpness tests a computer or the app gives more precise results.
How do I test the speakers?
In the “Sound” test play the left and right channels, a 20 Hz – 20 kHz sweep and bass. Crackling, buzzing or rattling at some frequency means a damaged speaker. The sync test shows whether sound lags behind the picture (common with soundbars).
Did the test reveal a fault?
Call us or get an estimated repair price. We diagnose and repair TVs at our service centre in Belgrade.