Hi aquamon,
After seeing your reply in the CRT repair... thread I began to suspect that that might be the case.
In many cases these days, repairs are far easier to diagnose that what you are used to, even without schematics.. Power supply circuitry has become much more 'mundane' and standardised, the primary side high voltage areas have become much smaller and segregated (making most fault-finding safer), with very few, if any, adjustments to make. It has become much more of an 'eyeball' the board for bulged caps etc. on the low voltage supply rails than systematic tracing. It's has become more about built in obsolescence, you can be pretty sure that at least 50% of failures are immediately down to capacitor failure rather than semicondictor.
Being smaller (but higher stressed) caps are much cheaper to just replace in bulk while the board is out rather than testing each one (apart from the 'big' primary side ones which tends to be low stressed). My concern is always much more about the amount of effort to get to something, the fragile nature of interconnects and connectors these days with small number of mating cycles. I spent a fair proportion of my career designing high volume consumer gear (set-top-boxes and digital TVs) and even with attention to detail, cost and available space makes this almost inevitable.
Sorry, for my reply at least, if you felt 'put down'. It's a shame that you no longer repair consumer equipment (for a living?). Repar of modern items could be quite profitable, (though much less interesting) depending strongly on local conditions. Consumers in too many countries assume that if it breaks out of warranty (even within sometimes), it's an excuse to throw it away and buy a shiny new one. Very sad. I don't know what consumer habits are like in Belize.