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It sounds like you need to reset this device to original specs. This can be done by leaving it unplugger for 4 - 5 hours.
Then is this does not work you will have to contact the company and get aa schematic. At that point we can begin troubleshooting.
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What do you mean by this blank screen. A screen with back light only? A screen without any back light [dark screen]? Provide more details please. If you wish to get details about these type of faults to Sony LCD TVs, check this link.
Open the OSD menu and select Channels with the left/right arrows and press Enter. Next, go down in the list and highlight Auto Channel Search. Press Enter. Then use the up/down arrows to get Antenna as the highlighted selection. Press Enter again. You should see the progress as the unit goes through the OTA channels. Press Exit to get out of the Menu when the scan is finished.
You will either have a fault with the inverter board which drives the backlights or a faulty backlight in the screen. If the problem is a backlight then a replacement screen is the only cure. One or the other is breaking down after it has been opn for a certain period of time, have an engineer call out & check with a tester if it is a screen problem.
Can you hear it doing various thinks, ie the hard drive light activity, whilst the screen is blank?
I am thinking that the button the change the screen to the TV or scart socket has bee pressed which means you can choose between the laptop screen and tv screen or an external monitor.
Usually actived unsing combine "function" and "CRT/LCD" buttons (or similar names).
The substrait is probably cracked, that's the circuits inside the pc board of the faceplate. It will cost you too much to try to have it repaired. If you will wait for a few days I may have a face for it as I'm currently trying to fix one that is blowing fuses. I'm not going to spend a whole lot of time on it. I'll let you know.