A TV that won't turn on is, the vast majority of the time, either a stuck power state a full drain clears or a failed power-supply board. The standby light is your first diagnostic — it tells you whether the TV is getting power at all, which decides everything you try next. This checklist is brand-agnostic; for model-specific steps, see Vizio TV not turning on or the broader Samsung TV not working guide.
Step 1: Read the standby light
- No light → no power reaching the board. Work the outlet/cord (Step 2), then suspect the power supply.
- Light on (solid or blinking) but no picture → it has power but won't boot or the backlight failed. Do the power-drain (Step 3).
- A repeating blink pattern → that's a fault/blink code. Count the blinks; it points a tech at the exact failed part.
Step 2: Rule out power source
- Plug the TV directly into a known-good wall outlet — bypass the power strip/surge protector to test it. Strips and surge protectors do fail.
- Reseat the power cord at the TV end (many TVs have a detachable cord) and check it for damage.
- Test the outlet with another device to confirm it's live.
Step 3: Power-drain (fixes most "light but no boot")
- Unplug the TV from the wall.
- Hold the TV's physical power button for 15–30 seconds to discharge the capacitors — use the button on the TV, not the remote.
- Wait at least 30 seconds, then plug back in and power on with the TV's button.
Step 4: Rule out the remote
If the TV responds to its own power button but not the remote, it's a remote/battery/IR problem — replace the batteries — not a TV power fault.
Step 5: Sound-but-no-picture = backlight, not power
If you hear audio but the screen is black, it's the backlight or panel, not the power supply. Shine a flashlight at an angle on the screen while it's "on" — a faint visible image means a failed backlight (a repairable part).
When it's a hardware failure
A TV with no standby light after a verified-good outlet and a power-drain almost always has a failed power-supply board — a common, replaceable part. Note the model and any blink code before calling a repair tech, and weigh the repair quote against the set's value.
FAQ
My TV has a standby light but won't turn on. It has power but won't boot. Power-drain it: unplug, hold the TV's power button 15–30 seconds, wait 30+ seconds, plug back in.
No lights and no response at all. It's not getting power. Test a different wall outlet directly (skip the surge strip), reseat the cord. If still dead, suspect the power-supply board.
I hear sound but the screen stays black. That's the backlight/panel, not power. A flashlight held at an angle reveals a faint image if the backlight has failed — that's repairable.
It only ignores the remote. The TV's own power button working confirms the set is fine — it's a remote/battery issue. Replace the batteries.