I had this issue where backlight would go off randomly, sometimes would work ok for an hour or so then go off (shining torch on the panel showed desktop). I measured the backlight board supply, PWM and BLON pins while in the fault state and these were in a state where backlight should have been on but wasnt. So in my case definitely the backlight board (inverter). The board is mostly solid state but there are 4 caps on it and it runs pretty hot, so I removed and tested the caps half way down the board and these measured ok, but the two near the power connector at the top seemed iffy. So I changed them - 270uF @35v (didnt have correct values so used some a little bigger) and its been ok since. I know theres some variations on this board so might be different fault on others, but mine was V267-604HF Hope this helps someone else. Its about £40 for new board and caps are a few pence so this is a cheap fix if you have the skills. UPDATE: This didn't last - although did last a fair while. In the end it was the...