Why do cathode ray TVs Pop even if not on sometimes?

Cathode ray tube (CRT) TVs can pop even when turned off due to the release of built-up energy or the discharge of high-voltage components, particularly in the flyback transformer or the capacitors. These components can retain electrical energy, which might suddenly discharge, creating a popping sound. Additionally, thermal expansion or contraction of materials inside the TV can lead to mechanical stress, resulting in popping noises. Dust or debris inside the CRT can also cause arcing, contributing to these sounds.