thanks for this topic !
I repaired today a backlight in two T4xx with this metod

I was mega upset on myself, b'cos I've forgot to remove a battery during lcd- swap ...
so I start to check voltage, resistance etc. on the famous F7 fuse ... and it was like above dj ricoh said.
total cost of repair - 5 $ ( my time and nerves not included)
for the rest of my life I will remember how to install a Lcd in laptop

thanks!

here is a photo just in case...
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