Thinkpads Forum

Hi,

i have a T420s, unfortunately the backlight is not working anymore.

I had this before on a T400s, soldering a fuse solved it.


Does anyone have an idea which are the backlight fuses on a T420s?

Here 2 photos:

http://s32.postimg.org/5beawzx2d/t420s_down.jpg

http://s32.postimg.org/75w7buqed/t420s_up.jpg


Thanks

Why don't you measure those fuses with a multimeter?
Then solder a new one on top of the bad one, piggyback-style.

RealBlackStuff wrote:Why don't you measure those fuses with a multimeter?
Then solder a new one on top of the bad one, piggyback-style.

Unfortunately i don't have a multimeter, but i will get one and post my result.
Thanks

I found the faulty fuse, it's F7 (see red circle on the photo).

Unfortunately i ripped of the capacitor (i think it is one) to the right (blue circle on the photo).

It still works though...anyone have an idea how important this capacitor is?

http://s33.postimg.org/ig3cnqr73/t420s_up_edit.jpg


MOD edit: Picture WAY too big, tags removed. Please read Forum Rules of the Road

Capacitor C313 = 1UF_25V (a.k.a X5R, size 1608)
http://www.mouser.com/search/ProductDet ... H104K080AA

I'd say replace it, something else might cause damage if it remains missing.

Thanks for the link!

The problem is my very basic soldering-equipment and poor soldering skills...

I still have the ripped of capacitor, i already tried to solder it back on but it's soooo small