On Sat, 10 Apr 2021 13:58:15 +0100, R D S wrote:

snip

I've had the back off the TV, there's an IC on the power board with a
crater in it.

Ah and that's probably let the magic smoke out. ;-(

The problem from my 'I don't generally like to mess with SMPSU's' POV,
you can't guarantee that it's or it's_just the obvious that's dead.

I did once chase a fault on a PC monitor PSU where it obviously
started with a dry / OC smoothing cap but then escalated to several
other components. Various people had tried repairing them and had
repeatedly replaced an ever growing list of bits (some not 'consumable
cheap') before either hitting the magic component or giving up.

After trying the things that were suggested as the 'most likely' that
didn't work I found a complete new PSU from China that cost less than
even a couple of rounds of the components ... and that worked straight
away. ;-)

I did however replace it's main smoothing cap with the better quality
one I'd bought for the faulty PSU so even less was lost and it might
then last longer.

As an aside, I saw a stack of 5 cars on the back of a scrap lorry the
other day. They all looked undamaged (well, other than where they were
stacked directly on each other) and were all newer than our car and
imagine many may have been written off for the sake of a few pence
worth of components. ;-( [1]

Cheers, T i m

[1] A mate used to repair vehicle 'computers' and very often it was
only a few pence worth of parts that turned them from 'working' to 'a
very costly replacement and diagnostic re-configuring'.