HP 6735s Backlight not working

History - HP6735s cracked screen - replaced - works for 2 weeks then backlight went out - replaced inverter (twice in case one faulty). Replaced video cable. - Still not backlight. (LCD does work)
Was wondering what could cause this? according to service guide this laptop has a :-
' (7) Internal display switch Turns off the display if the display is closed while the poweris on. '
This is supposed to be located at the front near the hdd led. I have stripped the machine down and cant see anything that could be a display switch.
Can anyone help? I'm running out of ideas.
Thanks

Hi there. it's probably too late, but the switch you are looking for is not a normal switch. its small 3pin smd element (on the mb its: U45 near the hdd led) that reacts with small magnet located in the lcd lid. But I dont think it can be broken/fixable. Assume that its faulty lcd inverter circuit fault on mb, sounds like liquid damage for me,but if you are pretty sure, there is no damage caused , then its mb failure. Ive never seen anything llike that. Regards

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- Link to picture
- Sample item
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