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Check the input fuse first. If it is blown, there will be some short inside the power regulator circuit. Usually Sony sets uses STR regulated power supply. You can see this STR, and Ic, screwed onto a heatsink. Replace it with a same type and number. Before replacing the STR, check the diodes used in that section for damage, mainlu zener diodes. They might get shorted along the blowing of the STR. Check that section throughly before resoldering the new STR.
If any further assistance you needs, get me through Fixya. Ok.
next time dont leave your tv pluged on power, the power supply got burnt, check your power supply on the following components
fuse, power transistor, zener diodes,also rectifier diodes
if you can manage do it at home
or take it to a w/shop
the power supply is a switched mode. you need to take your tv to a w/shop, and let them check the following.
powersupply rectifier diodes, power trasistor lekage,
diodes, zener diodes,
if a 90-110 volts to the line trasistor,
a line transistor be checked.
the tv simple problem
check the following, at the w/shop
power supply transistor,zener diodes, fusable resistor, line transistor, near line transformer,
your tv is not oscillating so even the ht voltage of 90-110v from power supply be checked.
The Sony part number for these diodes is 8-719-108-12 and yes they are 9.1 volt zener diodes @ 1 watt. I have the service manual for this set if you need it put can only send a large file like this trough a proggy called pand, so if you go to pando.com and get the proggy and leave youe e-mail addy I will send you a copy of this service manual. Good Luck
Since it is 5 years old mostly dry soldered appears. First sort out the soldered problem. Then check zener diode in video input path is short. Mostly the diode is short. Still get problem check video switching ic also. I think former is the most problem.