If I immediately turn it on again, sometimes it will stay powered on with the backlights lit, but again no picture. Sometimes it will do the same thing as before and turn off 15-20 seconds later. Can you tell me what board(s) are the most likely cause? Thank you very much in advance, Tom
SOURCE: Problem with Sony Bravia 46" TV (Model
blow out fan in mother board tower mother is over heating and not geting enough of air leting the mane chips over heating makes computer stop so it doesnt catch fire.
Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electro-medical.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.
Sorry to say but it sounds like your power supply is bad, although it is possible it is some other components in the TV because turning it off allows all diodes etc to power down completely. Unfortunately after a bit it happens again which leads me to believe again power trouble.
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