Try unplugging the TV for 2 minutes. TVs have become little computers and need rebooting now and then. it should be fine after you plug it back in and turn it back on.
Try unplugging and waiting about a minute and then plug it in again. If that doesn't work then it's probably a problem in the power supply.
SOURCE: 52 inch insignia tv it went black but still has sound
Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
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