It was a week ago. The climate was cloudy, when all of a sudden there was a lightning and a deafening sound of thunder. It was as if the thunderstruck near my house.
I was viewing tv and the cable signal stopped and the power adapter to the set-top box has gone.
Similarly, the Lan port on my computer goes off, giving no internet access, as the Ethernet light does not glow in the modem/router. I tried resetting but still could not get the Ethernet light on the modem.
My query is, how it damages selective ports in some devices.
My neighbor has lost his tv, and set-top box totally in the impact.
Is there anything I could do to avoid this?
The TV and the set-top box adapter have been connected thro the stabilizers
Yes, disconnect all devices from the main.
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It damaged the most vulnerable ones. That is the ones with insufficient protection or ones that have longer connections allowing it to pick up more of the electromagnetic pulse that the lightning (not thunder) strike produced. For example the long antenna leads on the set top box.
When I designed set top boxes I always used gas discharge tubes to protect against such strikes. It is entirely possible that on your boxes these were not used in order to save money.
The lighting surge may have come in on your telephone line through internet router then to devices connected to router. Have the phone company check your surge suppressing device and earth ground.
I had several incidents like this before phone co discovered broken ground wire between connection box and ground stake.
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If the lightening stike is close enough then there is not a lot you can do.
The radiated field of a nearby strike can generate high voltages in any (long) wires nearby.
Had this happen to a customer once, lightening struck the door of thier office building.
Took out the telephone exchange and several but not all telephones.
The strike also took out a number of the PCs connected to the Ethernet network but not all.
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