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L440 backlight fuse location?

Posted: Tue Jun 23, 2020 12:37 pm
by Mandrak
Does anyone know the location of backlight fuse for Thinkpad L440?

I have tried with 3 different screens and two flat cables. Screens are from T440 and I know they work just fine.
Result is always the same. You can barely see picture when exposed to flashlight or direct sunlight.
External screen works fine.

Re: L440 backlight fuse location?

Posted: Wed Jun 24, 2020 12:51 am
by RealBlackStuff
Look for a small fuse near the mobo LCD-connector, usually marked with letter P on top.
The name could be printed nearby, such as: F1, F2, F3, etc.
It's a 3A/32V/Fast fuse (in different sizes: 0402, 0603, 0805 and 1206).
Measure for continuity with a multimeter.
Piggyback solder the new fuse on top of the old one.

Re: L440 backlight fuse location?

Posted: Sun Jul 05, 2020 6:57 am
by Mandrak
Thanks a lot!
Found and replaced it.
It is marked F5202, size is 0603.

Picture link: https://imgur.com/MJFuYMQ
Fuse is circled in yellow.