No Operation
No operation can be caused by a number of components, the most common being around the primary control IC, IC702. 
If the supply on pin one of this IC falls below 5V, the operation of the power supply becomes unreliable. (Note: that you will have to connect your meter ground to the negative end of the smoothing block.) 
As can be seen from the previous circuit description, the supply circuit is fairly complex, however only a few components cause problems. For
low supply voltage to IC702 check R770 (270? safety) and R771  (470k?). It has also been known for R721 and R703 (both 150k?) to fail causing a low 5V line.
IC707 (the secondary 5V regulator) can fail leading to a set that does not turn on, even though the power supply starts
up. Normally its output goes low at around 3V.
No operation of the power supply or low HT (at about 30 to 40V) can be caused by R713 and R714 going high or
breaking down under load. It is important that these two resistors are checked by substitution as they often read OK on
a meter, even though they are faulty. Note that they should be metal film resistors and not carbon composition.