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When you need to replace the output transistors, do them both at the same time with a matched pair. That way you won't unbalance the power supply and will be assured of the same power out is available on both channels.
Look for a fried (possibly exploded) transistor or diode on the power supply board. In particular, look at the transistor mounted on a heat sink (metal radiator block) between the fuse and the largest transformer on the board. It may also have a damaged regulator chip driving it. Modern TV sets operated by remote controls generally have the power supply split into two sections
- standby and main. Your problem is most likely in the main section.
A voltage sniffer won't tell you much - most sets have power right up to the fuse on the power supply board. If the fuse is blown, don't bother replacing it until you find out what blew it - you'll just waste another fuse. I generally start by doing ohmmeter checks (power disconnected!) on the diodes and transistors - anything reading less than 1 Ohm is probably fried or is being shorted through a transformer winding by another fried component. Other readings must be interpreted according to the circuit design.
this is a normal behavior if one of the power supply transistors have blown. take the unit to an enlectronics repair. they can either change the transistors affected (usually more than one) or replace the power supply board.
I would have to guess that you have fried the power supply, that would be the board where the power cord connects, there should be a 15 amp fuse around that connection so check for it. This may need to have a tech look at....
If the fuse blew again then there is more than likely a problem with one or more of the boards components. First start by unscrewing the power supply and looking on the underside, you may see some burn marks. If you do then it is likely that the component above the burn marks has blown and needs to be replaced.
If you do not see any burn marks then the best place to start is with the diodes on the board.
If its still not working, e.g. the fuse blew again then it may be that the problem lies elsewhere on the power supply...