Does anyone know the cost of backlight issues on a 41 inch maybe replacement

There are at least 2 circuit boards involved in operating the backlights, often 3 or even 4. First, when you turn the set on the main board will send back 3 signals to the power supply to turn on various sub voltages. These signals are Power On, Backlight On and Backlight Adjust - if any of those signals fail you will have no backlight. Assuming that all 3 arrive correctly at the power supply, any of the sub circuits may have failed or the failure could be on the LED driver board or inverter. The LEDs or CCFL lamps could have failed. In modern sets a failure in any of those circuits would cause no backlight, see the problem with trying to guess without taking a look? But repair is almost always cheaper than replacement. While we give a free estimate and have no upfront fees for that we actually do need to take the set apart and troubleshoot it before we can give one. It's free to find out if you can bring the set in.

Call the shop in the morning, they'll be egar to answer any questions you have and give you a ball park estimated price..