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Screen Backlight Not working - X280 - fuse??

X230 through X280, plus X390 series specific matters only
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flyingfish989
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Joined: Sat Feb 08, 2020 4:13 am
Location: Swansea, Wales

Screen Backlight Not working - X280 - fuse??

#1 Post by flyingfish989 » Sat Feb 08, 2020 4:16 am

I have a Lenovo X280 laptop, and the sausage that I am tried to upgrade the screen without disconnecting the battery (i know DUH)

result: neither the original panel or the upgraded one has a functioning backlight, but if I shine a torch behind it, it displays windows etc.

I think I've blown a fuse on the motherboard? how would I find out if this is the case?

how would I get hold of a replacement fuse?

or if you think it's something else then please help!
my dissertation is currently being written on my phone :(
Any help is massively appreciated!

RealBlackStuff
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Re: Screen Backlight Not working - X280 - fuse??

#2 Post by RealBlackStuff » Sat Feb 08, 2020 7:26 am

Don't have the schematics, but on all X230/X240/X250 its a fuse near the LCD-connector on the motherboard.
Newer models almost certainly use the same fuse.
Check the fuse for Continuity with a multimeter.
Model is ERBRD3R00X or FUSE-3A32V-17-GP or 0438003.WRA, marked with a letter P
(3 A, 32 VDC, Fast Acting, size: 0402 or 0603 [in metric: 1005 or 1608)

Available from the likes of Farnell, Mouser, etc.
Buy a few, then piggyback-solder one on top of the old fuse.
Lovely day for a Guinness! (the Real Black Stuff). And pigs CAN fly!
Check out The Boardroom for Parts, Mods and Other Services.

"Computers don't lie, but liars can compute." (Terry Hayes's I Am Pilgrim)

flyingfish989
Posts: 2
Joined: Sat Feb 08, 2020 4:13 am
Location: Swansea, Wales

Re: Screen Backlight Not working - X280 - fuse??

#3 Post by flyingfish989 » Sun Feb 09, 2020 10:06 am

Hey, thanks for the response!

do you think i will be okay to piggyback solder it on top with a normal soldering iron (one with a pointy tip at least) or would i need one of those fancy heat gun ones?

RealBlackStuff
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Re: Screen Backlight Not working - X280 - fuse??

#4 Post by RealBlackStuff » Sun Feb 09, 2020 10:21 am

Any small-tip soldering iron will do.
Use some lead-based 60/40 solder with resin/rosin core, and screw RoHS.
Lovely day for a Guinness! (the Real Black Stuff). And pigs CAN fly!
Check out The Boardroom for Parts, Mods and Other Services.

"Computers don't lie, but liars can compute." (Terry Hayes's I Am Pilgrim)

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