Voltage spikes, lightning season and protecting your TV in Nellore

TVs in Nellore do not usually wear out; they get killed. The two killers are the spike when power comes back after an evening cut, and the surge that rides in on the mains or the dish cable during a thunderstorm. Both hit the power supply board first, and both are largely preventable with one cheap device and one habit. Here is what actually happens and what to do about it.

What a surge does inside the TV

A TV's power supply is built to take anything from roughly 100 to 240 volts, so the evening dip that makes the lights go dim does not hurt it much. What it cannot take is a brief spike many times that — the kind produced when a feeder is switched back on and every motor in the street starts at once, or when lightning strikes a line or a pole nearby.

The spike arrives at the power board, and one of three things happens:

• The fuse or the input protection takes it and the TV goes dead. Cheap repair.
• It gets past the fuse and cooks the capacitors or the switching components. Still a power board repair.
• It gets through to the main board or the backlight driver. Now you are replacing two boards, and on a large smart TV the main board is not cheap.

Repeated smaller spikes do slow damage too: capacitors swell over a year of bad evenings, and one day the TV clicks, the standby light blinks, and nothing else happens.

Stabiliser versus surge protector

They solve different problems, and people regularly buy the wrong one.

Device	Protects against	Worth it for a TV?
Voltage stabiliser	Slow under- and over-voltage	Only if your supply regularly sits well outside the normal range; most TVs cope without
Surge protector	Brief high-voltage spikes	Yes — this is the one that matters
Plain spike guard / extension board	Nothing, usually	No
UPS / inverter supply	Cuts and dips	Useful, but does not replace a surge protector

A proper surge protector has a rated clamping component inside that shorts the spike to earth. Two caveats: it needs a working earth at the socket to do its job — worth having an electrician check if your building is older — and the clamping component wears out. After a serious lightning storm, assume it has done its job and replace it.

If the TV is on an inverter, it is still worth a surge protector; the inverter protects you from the cut, not from what happens on the mains when the cut ends.

Lightning season

Nellore gets its worst lightning in two windows: the pre-monsoon storms of April to June, and the north-east monsoon from October to December, when evening thunderstorms roll in off the coast. The coastal side — Muthukur, Krishnapatnam, the eastern edge of the city — sees the most.

The habit that saves TVs: when a storm is close, unplug the TV from the wall, and unplug the cable from the set-top box or dish too. A surge protector on the mains does nothing for a surge coming down the dish cable from a roof-mounted antenna, and that is a common route for lightning damage. The set-top box usually dies first, then the HDMI board in the TV.

Switching off at the remote or even the MCB is not enough. A big enough surge jumps a switch. The plug out of the socket is the only certain protection.

After a cut or a storm

• Wait a minute or two after the power returns before switching the TV back on. The first seconds are the roughest.
• If the TV is dead with no standby light, try the socket with a lamp first, then stop. A dead power board is a routine repair; repeatedly switching on will not fix it.
• If the standby light blinks, the same applies.
• If the TV works but the HDMI input from the set-top box shows nothing, suspect the box and its HDMI port before the TV.

Power supply and board faults are ₹350 on our rate card for diagnosis and labour, with the part at MRP shown before fitting. If the surge took the backlight driver and the strips with it, that is the ₹499 backlight job.

A short checklist for any TV in Nellore

1. A genuine surge protector between the wall and the TV, on a socket with a working earth.
2. The set-top box and soundbar on the same protector, so nothing reaches the TV through a side door.
3. Plug out of the wall and dish cable out of the box when a storm is overhead.
4. A replacement surge protector after a serious strike nearby.
5. Power back on a minute after a cut, not in the first second.

None of this is expensive, and it is cheaper than a main board.