Rohit Pillai

What “TV not turning on? What the standby light tells you” covers

When a TV will not turn on, most people assume the panel has failed and the set is finished. Very often the screen is fine. A TV needs power from the socket, a working power board inside, and a clear command from you before a picture appears. A flat remote battery, a switched-off extension board or a TV stuck in standby breaks that chain just as surely as a burnt part. The small light at the base of the screen is your best clue to where.

1. Read the standby light first. The standby light tells you whether power is reaching the TV. If it glows steadily, electricity is getting in and the TV is waiting for a command, so the remote or the screen is the likely problem. If there is no light at all, either no power is arriving from the socket or the power board inside has stopped working.
2. The remote and its batteries. A remote with weak batteries can still light up its buttons but send a signal too faint to reach the TV. Press the power button on the TV itself, usually found under the bottom edge or at the back. If the TV starts that way, the remote is the problem.
3. Socket, extension board and a power drain. With no standby light, check the supply before blaming the TV. Plug a lamp or a phone charger into the same socket. If that does not work either, the socket, the switch on the wall or a surge protector is the cause, and many surge protectors switch themselves off after a power spike.
4. On but showing black, or truly off?. A TV can be running with a completely black screen. Listen for sound, and check whether the standby light goes out or changes when you press power. If the set box is off or the TV is on the wrong input, you get a black screen too, so press the input or source button.
5. Blinking codes and power board failure. A standby light that blinks in a repeating pattern is often the TV reporting a fault it found while starting. Count the blinks between pauses and look the pattern up in the user manual or on the maker's support page. Repeated clicking, a light that comes on then dies, or no light even on a working socket usually points to the power board.
6. What to try, in order.
7. What to take from this. Before you decide the TV is dead, look at the standby light. A steady light means power is arriving, so test the remote and the TV's own button. No light means check the socket and surge protector, then try a full power drain.
8. Common questions. A steady red light means power is reaching the TV and it is in standby, waiting for a command. The usual cause is a remote with weak batteries or a signal that is not reaching the sensor. Press the button on the TV itself. If nothing happens, unplug it for a few minutes and try again.

What “QLED vs LED TV: What Actually Changes” covers

Walk into a shop and QLED and LED are set out as two different technologies, with QLED as the newer and better one. They are not two technologies. Every QLED set on that wall is an LED television — the same backlight behind the same liquid-crystal panel — with one thin film added in front of the light. That film is the entire difference. It changes one thing a great deal and another thing not at all, and almost every disappointed buyer is somebody who expected it to change the second one. Once you know which is which, the choice stops being about the badge and becomes a question about the room you will watch in.

Products it covers: TCL QLED 65-inch 4K TV (₹59,490 today), TCL QLED 55-inch 4K TV (Mini LED) (₹54,990 today), Visio World VW Pro QLED 55-inch 4K TV (VW55GQ2) (₹30,999 today), Samsung Neo QLED Vision AI 55-inch 4K TV (Mini LED, QA55QN2EHA) (₹68,990 today), Xiaomi FX Pro QLED 55-inch 4K TV (L55MBFPIN) (₹35,499 today), TCL T6D QLED 55-inch 4K TV (₹41,990 today).

1. Both of them are LCDs, and everything follows from that. An LCD television makes no light of its own. Behind the picture sits a sheet of white LEDs that is always on while the set is on, and in front of that sits a layer of liquid crystal divided into pixels. Each pixel works as a shutter: twist the crystal one way and light passes, twist it the other way and most of it is blocked.
2. What the quantum-dot film actually does. The film is a sheet of microscopic crystals, and the useful property of such a crystal is that its size decides exactly which colour of light it gives off when something shines on it. The backlight in a quantum-dot set is deliberately blue rather than white. That blue light hits the film, and the dots convert it into very narrow, very pure red and green.
3. What it does not do, and this is where buyers are let down. The film sits in front of the lamp, so the lamp is still behind every pixel on the screen. A shutter can close, but it cannot close perfectly, and the light leaking through a closed pixel is what you see as black. On a quantum-dot set that leaked light is just as present as on any other LCD.
4. Mini LED is the upgrade people think QLED is. If black level is what bothers you, the specification to look for is the backlight, not the film. An ordinary set lights the whole screen from a handful of zones, sometimes only from the edges. A Mini LED set replaces those with hundreds or thousands of much smaller lamps, so it can drive one area bright and leave the area beside it almost off.
5. So when is the badge worth paying for. It comes down to the room. A living room with large windows and daytime viewing is exactly the case quantum dots were made for: you will be driving the panel hard, and that is where ordinary panels go pale. A room you darken for films is the opposite case, because at low brightness an ordinary panel holds its colour perfectly well and the thing you will notice instead is the grey where black should be. Size matters too. Below about 43 inches at a normal sofa distance the eye cannot resolve 4K, and panel quality differences shrink with it, so the money is usually better spent on the sound.
6. What to try, in order.
7. What to take from this. QLED is an LED television with a quantum-dot film in front of the lamp. That film buys colour that survives high brightness, which is a real advantage in a bright room and a small one in a dark one. It does not change black level, because the lamp is still behind every pixel.
8. Common questions. QLED is a kind of LED television, so the comparison is not quite the one the shop sets up. It adds a quantum-dot film that keeps colour pure at high brightness, which helps most in a bright room. It does not improve black level at all, because the backlight still sits behind every pixel.

More on tvs, from the rest of the desk

• TV screen flickering? How to find the cause at home · Neha Chaudhary

  A flickering TV is often a loose cable, a bad source or a picture setting, not a dying panel. These simple checks show you which one it is before any repair.

• TV remote not working? What to check before buying a new one · Kavya Nair

  Most dead remotes are a battery contact, a blocked sensor or a lost pairing, and each takes a minute to rule out. Here is the order to check in, and how to tell an infrared remote from a Bluetooth one.

• Before You Buy a 100 Inch TV · Karan Joshi

  Four things decide whether a screen this size works in a room, and three of them have nothing to do with the television. Two are settled before it arrives.