Try to replace an inverter board
It sounds like you have either an inverter or backlight problem. You will need to remove the casing around the screen to determine which.
I would guess its the inverter. This converts DC power to AC power which powers the backlight. Backlights are probably less likely to fail than inverters. The only real way to check though, is to swap the inverter for a known working one and see if that solves the problem. They are not too expensive.
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