L have a toshiba lcd tv 42rv530u with normal sound ,black screen

Do you have a dull glow on the screen when its turned on? IF yes then you have a dead t-con board and replacing it should resolve the issue. If you have no glow at all then your backlight inverter has failed. In that case you should replace the inverter board to solve this problem. In any case this problem should not run you more than 150$ if you want to do it yourself. let me know if this is the case so that I can help you with the repair.

Hi.

IF TV has sound but screen is completely dark, then the inverter is not firing up. Before replacing the inverter, PSU and main board must also be tested.

Here an article on the problem.

Here how to test the inverter.

Hi


Thanks for using FixYa. Hope you already know that this cannot be corrected through the MENU options. To resolve this issue you?ll have to open the back of the unit and check the inverter board which is the power supply source for the backlights. The issue can be a bad inverter board and/or the inverter board is not getting 20vdc from the power supply maybe due to the connector that has gone bad/loose.All this is only recommended to be done by someone who has electrical expertise and knows about the internal circuitry of the unit. Please do accept the solution if the issue is resolved or post a comment for further assistance.


Thanks
Rylee