Screen made a snap like sound and went dark. What are the possible replacement parts needed?

https://www.youtube.com/watch?v=ukqTvKHPyF0

although ir board good tips on other possible failure points
https://www.youtube.com/watch?v=sDwZQIZB1nU

Good Fault finding of power supply with expected voltages
https://www.youtube.com/watch?v=gRDZDRGFRxk

Sounds like Back - light problem. 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.

-You have a bad panel. Led arrays internal to the panel are defective. Replacement cost exceeds economical repair.

Your Xbox Rims In Xbox ARE NOT WORKING.

This sounds like transformer failure, time for a repair shop....

maybe z board bad need replaced

Replace main board will fix the problem.

take it to repair shops. have you ever dropped it hard enough to knock out one of the cable screws? its happened to me. the screws are VERY VERY small. thats all i got on this.

Its possible that the backlight is failing.

Try pressing the FN (function key) and the more light button, it most likely has a bright sun on it, possibly the up key.

Have u tried re-installing the video drivers?