Right lens of headset turns on but only shows a black screen

I bought my index second hand and its out of warrenty according to the friend I got it from. The first few weeks everything was working perfectly fine and I havent been rough with it. However, the right side of my index suddenly stopped showing video and flickered twice during a play session in vrchat one day and now only shows a black screen. The left side still works and when I start the headset up, the right side starts out white then has a rainbow of pixels before turning black. I've already tried a new trident cable and tether but the problem persists. I just want to confirm that it's the eye tube itself that needs to be replaced before buying anything unnecessarily so I can repair it and have proper vision again!