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You need to check the output voltages of the power supply to see which one goes off. It may be due to short circuits some where,if otherwise Power supply board have problems,just not dead yet.Replaced the power supply board,will solved this problems.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
Only Toshiba service centre can help you. The cost of replacing the screen so high, it is better to buy a new one. I think someone has broken the scree. If you want to buy a new TV, look for a TV which has a glass front before the screen. These TVs are high end.
The 2 long boards call the LCD inverter boards are dead.These 2 long inverter boards help the LCD screen to have backlight to produced a picture.These 2 long LCD inverter board are dead,must be replaced to get a picture again.Tries websites like Shopjimmy.com,Ebay.com to buy these 2 refurbishes long LCD inverter boards for the replacement.
Best of luck finding a replacement screen. Typically the screen is what get damaged and finding an exact model with some other issue is your only hope, that and finding someone to ship it to you as in most cases it's only local pickup. I think you'll find a replacement lcd (new) cost is way more than buying a new set. Best of luck.
The LCD screen itself often cost more then the tv set itself. If you have accidental insurance you might see if they cover this, otherwise this will make a nice lava lamp like art display for a bedroom wall.......