Hi Ron. You try so hard to help
SMPS....I hate them. Unfortunately, they are here to stay. And getting smaller, more efficient and cheaper as time goes by...
I deal with them everyday of my life as a CRT tech....no modules to swop and change and get lucky with CRT....you either fix the blown PSU yourself or reject the entire set/TV. The PSU and the TV are one on one common PCB...
I often think about the Guys who are in the business of fixing LCD, PLASMA, LED and other newer TV's....they have the luxury of having boards to swap out to isolate problems.....no real repairs..except the obvious of "caps"........Replace the Electrolytics blah, blah, blah.
Monkey see monkey do. Almost every answer lately about SMPS problems is "change the Caps". Even my Gran knows that by now.
So no real board level repairs anymore. Changing boards is easier.
So, that is why knowledge on actual SMPS repairs is going downhill fast. Nobody cares anymore to try and fix them or understand them...
Hey!
!! just buy another one. Certainly cheap enough anyway.
A sad state of affairs indeed.
I was going to post more...but why bother??
Except one little thing: A SMPS is only as good as it's Main Smoothing Cap.....that can be rated up to 450VDC....which is available easily...that means that it can "theoretically" handle a Mains Surge of around 280VAC MAXIMUM.....not continious...otherwise it pops...
Money for jam for us here....I fixed five sets here today...all from a Guest House up the road..all urgent...all Main Smoothing Caps popped.
Some blew the Bridge Rectifier as well and the Mains Fuse.....but not one blown Chopper Stage...... SMPS is a money maker here
Regards,
tvtech
EDIT: Sorry for the rant...had to get it off my chest