My TV power blowed off, how can i troubleshoot the power supply?

The power supply has been damaged as the power came back on.
It requires a power supply repair.

The tv have a short in many parts internally in tv power supply board itself could be anythings on the tv power supply board to causes the fuse to blow over and over again.U will never solved it if u don't have all the measuring elecronics equipments and skills and know how to find out.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

This is a dead short, check power supply for diodes bad or zeners

The power supply board is gone. You can get parts from here: TV Parts Universal TV Stands DLP Chips ShopJimmy

theres a shortage in the circuit try check the rectifier diodes at primary power supply section, not dangerous to little knowledge,refer to a qualified service technician

You probably have a bad Power Supply. There are usually 1 or 2 fuses on the P.S. board. You can check them with a cheap ohmmeter (make sure the TV is unplugged first!). If they are bad, you have a bad Power Supply. Don't bother replacing the fuses without finding out what caused them to blow, or else they will just blow again. Take the set to a qualified technician.

When fuse blows again and again that means power supply is bad and needs to be replaced.
Let me know exact model of your Sony TV to provide you power supply board part number info.

If the fuse blows again after replacing it, there's a shorted diode, bridge rectifier, capacitor or transistor in the power supply.
I repair these power supplies. If you need furhter assistance, write to [email protected]

It's definitely an overheating problem if your plasma turns off by itself after a while. I would suggest to place a cooling fan near the back of it as a temporary fix.
There could be a power supply issue along with a Ysustainer board but in order to know that for sure, you should use a hair drier and blow hot air to the power supply and see if the TV turns off, if the time that the tv turns off is shorter when blowing hot air to the power supply; then is the power supply issue.
Good Luck.

the poer supply faulty. Isolate Horizontal output stage from the power supply and connect dummy load (like normal bulb same wattage as TV ) and test. before that pls check all component in power supply and replace and burnt parts spacialy diodes caps and power regulater ic as well