QUOTE(victorian @ Apr 13 2021, 09:55 AM)
Anyone did their defect check themselves? Would like to ask what is the common way to check for electricity ? Will using a test pen be sufficient ?
Test pen only indicate presence of AC 230V.
It won't tell you:
Wires not screwed tightly or at all in socket (only way is to turn off everything and open the socket to see); 230V easily jump across small air gaps or poor contact. Moment I open the socket the wire already dropped out on its own accord

If neutral and live cables are reversed colour code. Swapped or wrong colour codes used can and will happen.
If green supposedly earth is connected properly or even at all.
Always assume the previous joker is an idiota when working w electricity. Test all wires not just the one that looks like the live colour.
Testing more never killed anyone.
Lack of testing, well they not around to complain..
You can use a socket tester to be more precise, or if just want to confirm got power, use a cheap lamp will do.
For checking scratches on window pane, come at night and use a lamp to see, it show up easier than in daytime.