As a side note to post number 20 .... many of the newer cell phones have a filter and you will NOT see the IR.
To be fair, presumably his remote isn't working at all? - which means it's almost certainly not putting out any IR - so it 'probably' wouldn't acheive a great deal with a camera - unless the TV itself is faulty?, but that's much rarer still. As an ex-TV engineer I did change a number of IR receiver IC's over the years, but despite been a Sony service agent I don't remember ever changing a Sony one?.It's pretty rare for the IR emitter to die. The diode test on your DVM might not pick it up either, The camera is the easiest test. Check all of the buttons.
most modern digital cameras have IR filters or it may be barely noticeable.If it has not already been mentioned a quick test is to point a digital camera at the remote and press one of the buttons. You should see the LED flashing as many digital cameras respond to IR. (Not all do as there could be an infra red filter between the lens and camera chip.)