As they say, it is always worth having a poke.
We rented a colour TV from Rediffusion in the olden days when I was poor underpaid Sergeant. It was prone to lose the picture when a diode on the power supply board overheated. The clue was in where the smoke came from. A Rediffusion repair man arrived (not
tony draper) and being informed by Missus B that the fault was "the diode on the power board" insisted on having a poke around the innards. There was a bang and flash and the poor fellow was thrown across the room. "Are you sure you know what you're doing?" asked Missus B. He fled. Another repair man turned up in the afternoon and changed the diode.
