A second-hand TV can be a great deal, especially for a venue that needs several screens. It can also be a panel with burn-in, a dying backlight, or a dead HDMI port that the seller "never noticed." The checklist below takes about 20 minutes and needs nothing more than a laptop or phone with an HDMI connection, plus this site's free tests.

Bring: a laptop with an HDMI output (or a streaming stick), an HDMI cable, a phone flashlight, and a USB stick with a short video. Ask for the TV to be off when you arrive, so you can see it cold-start.

The checklist

  1. Inspect the panel, screen off. Look at an angle with a flashlight for scratches, pressure marks, and cracks. Check the back for missing screws or signs it was opened.
  2. Cold start. Power it on from the wall. It should start within a few seconds without clicking repeatedly or flashing a standby light in a pattern (often an error code).
  3. Dead and stuck pixels. Connect your laptop, open the dead pixel test fullscreen, and step through red, green, blue, white, and black. Look for dots that stay black or stay lit. See the dead pixel guide for how to read the result.
  4. Burn-in and retention. Continue to the mid-gray and dark-gray frames. Look for ghost logos, tickers, or a taskbar outline — especially on OLED and plasma. If you see one, the retention vs. burn-in guide explains whether it could fade.
  5. Backlight and uniformity (LCD). On the black frame in a dimmed room, look for bright patches in the corners (backlight bleed) or a blotchy look. On white and gray, look for darker zones or a dirty-screen pattern. Some unevenness is normal; large, obvious patches are not.
  6. Dead backlight zones and flicker. Play varied video. Dark bands, flickering, or a picture that dims after a few minutes usually mean failing LEDs — a common, expensive fault on used LCDs.
  7. Every HDMI port. Move your cable through each input. Check that 4K or the highest resolution your source offers is detected. A dead port is common on TVs that have been wall-mounted with tight cables.
  8. Power-cycle three times. Turn it off and on with the remote, then at the wall. Intermittent power-board faults often show up as failed restarts.
  9. Sound. Play audio at low and high volume. Listen for crackling, buzzing, or one side missing. Also listen with the screen on for a high-pitched whine from the power supply.
  10. Remote, buttons, and Wi-Fi. Test the remote, the physical buttons, and whether the smart platform connects to a network and still receives updates.
  11. Settings and history. Look for a usage-hours counter in the service or support menu (some brands show one). Check the model number and manufacture date on the rear label, and search for known faults with that model.
  12. Paperwork and warranty. Ask for the receipt and whether any manufacturer warranty transfers. A refurbished unit from a retailer with a 6–12 month warranty is often worth a small premium over a private sale.

Red flags

  • The seller has it already on and playing when you arrive, and doesn't want it turned off.
  • It was used as a sign or in a shop window (heavy static use, high brightness).
  • Burn-in visible on gray screens on an OLED or plasma.
  • Any vertical or horizontal lines in the picture — almost always panel or connection failure, not fixable cheaply.
  • A picture that comes back only after several attempts to power on.

Buying used screens for a venue

For bars, ex-display and ex-hotel TVs come up often. Ex-hotel (hospitality) TVs have usually run moderate hours with varied content, which is easy on the panel. Ex-signage and shop-window displays have often run long hours with static content: test thoroughly for burn-in and backlight wear. Before buying several of the same model, check the signage vs. consumer TV guide to confirm the model is suitable for your daily hours.

Frequently asked questions

How do I check a used TV for burn-in?

Display a full-screen mid-gray and dark-gray image and look for faint shapes such as channel logos, tickers, or taskbars. OLED and plasma TVs are most at risk. The dead pixel test on the Bart Television homepage includes gray frames for exactly this.

What should I test before buying a used TV?

Check the panel for physical damage, cold-start it, run a solid-color dead pixel test, check gray screens for burn-in, look for backlight bleed and dimming zones, try every HDMI port, power-cycle it several times, and test sound, the remote, and Wi-Fi.

Is it worth buying a used OLED TV?

It can be, if you can confirm there is no burn-in on gray test screens and the seller describes mixed use. Avoid OLEDs that were used for news channels, gaming HUDs, or signage for long hours.

How long do TVs last?

Most modern LCD TVs last many years in normal home use; backlight LEDs and power boards are the usual failure points. Heavy commercial use shortens that. A TV that has run 12+ hours a day in a venue has aged much faster than one used for a few hours each evening.

Last reviewed on 2026-10-01.