回答“Backlight randomly turning off”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.