Inverter and screen replaced; why does screen still go dim?

I have a Toshiba A135-S4427 with a very dim screen.  I replaced the inverter, and then the screen itself, to no avail.   I know the screen I bought has a new backlight.   Can anyone shed some light in this (screen) darkness?
t6billAsked:
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edbedbConnect With a Mentor Commented:
Normally it would be one of the two things you tried. Assuming that one of them is not defective, that leaves two possibilities. It is either the video cable or the motherboard will have to be repaired.
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MarkConnect With a Mentor Commented:
Have you checked the small pin that gets pushed in to turn off the backlight when the lid is closed, if this is pushed in and hasn't released it will keep the backlight off.
Sometimes this is a magnetic switch inside the bezel of the screen and passing a small magnet over it can shut off the backlight. If it is bad then it may be keeping the backlight from starting up.
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nobusCommented:
does it light normally on an external LCD screen ?
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t6billAuthor Commented:
Yes, it does light normally on an external LCD screen.
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nobusConnect With a Mentor Commented:
your possibiliteis are : the new screen is bad; the inverter is bad, or the video card is bad
+ the switch, as sparkmaker said (easy to test)
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