My sony KV-32xbr70 has had this happen twice before. It seems when there is a power surge it knocks out the pic and sound but it still makes the noise it make when you hit the power button..and the power light doe come on......someone told me there is a fuse of some sort and it is a cheap and easy fix..can I do it myself? I am a remodeling contractor and can fixjust about anything...thanx for anyones help!!
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Sounds like you've got a short in your house electrical lines. Try using a surge protector (AKA power strip) between the power cord and wall outlet. If you've already got a surge protector, try replacing it.
Anything can be repaired. But the cost can be a problem. The most commond thing to happen is the power supply gets knocked out (fixable problem), but I have seen the whole tv get knocked (not cost effective) out as well. The only way to find out is to let a repair shop look at it.
If your friend is being honest, and why shouldnt he, and the set was knocked over, I'll bet there is now a small crack in the main board. Cracks in boards due to dropping or "knocking over" usually occur next to the flyback transformer or tuner. Cracks in boards are very easy to fix so if you do not have experience working inside TV's then allow a qualified tech to handle it for you.
Could be a problem in the shutdown circuit,in the HI Voltage detection circuit,or the flyback transformer. If your not a tech, you shouldnt be experimenting by adding parts as its going to knock you against the wall if it bites you. You should start out with a service manual and check the voiltages as now thinking it could be the power supply voltage regulator also. Please call a pro to assist you with this repair. Good Luck