This TV had no power and the service manual can be found here
I checked fuse F602 and it was open. The main switching transistor Q601 was shorted gate to drain. I checked the diodes in the secondary output and one of the SB3A0H diodes was shorted as well. With these three parts replaced, there was still no output on the AMP+13V and P-ON+21V line.
With Q601 shorted, there would have been unexpected high voltage at the gate and components connected to it may be damaged. I found a repair kit on ebay which gave clues to which components to check. Probing the circuit, I found D607A (27V 500mW Zener) questionable, Q602 (2SC5334S NPN 30V 0.8A) questionable, D608 (36V Zener) shorted and R611 (0.3ohm 2W) open. D609A (schottky diode) tested good.
Here is a parts list with Digikey substitutes.
F602 Fuse 2.5A 250V 507-1180-ND
Q602 IRF640 N-CH MOSFET 200V 18A IRF640NPBF-ND
D608 Zener 36V 1N4753A-TPCT-ND
R611 Res 0.3 ohm 3W PPC3W.30CT-ND
Q602 NPN 125V 0.8A BCX41TADICT-ND or 45V 0.8A BCW66GLT1GOSCT-ND
D653, D655 SB3100 SB3100FSCT-ND
D607A Zener 27V SM TFZVTR27BCT-ND (can substitute leaded axial part and place in D607)
With all these parts replaced, the TV powered up. The heatsinking for Q602 is inadequate and probably caused the initial failure.