X220 Blown Back light Fuse

[allann9]

Hello, I recently bought some x220 tablets and I left the battery on while replacing the screen. I have read that it may be fuse F1, F2, F6. I have a voltmeter how can I check the fuses and how can I replace them? All the help I can get will be appreciated. Thanks

[nitrocaster]

You have to check F1 fuse which is under the LCD connector - just measure its resistance. Good fuse has zero resistance.
Here's F1 on X230 board. I have no boardview for X220, but these boards are very similar, so most probably this is how X220 board looks like as well.


Larger version: https://i.imgur.com/dGiXc2T.jpg

Once you find it, desolder it and put a new one. The whole job can be done using iron, without hot air station or hot tweezers. Before you replace the fuse, make sure backlight power rail is not shorted to ground. To do that, connect LCD cable to the motherboard and measure resistance between ground and both F1 pads. If any measurement is near zero - you have to fix a short before proceeding with fuse replacement.

[allann9]

Thanks, I still cant seem to find it and also were could I buy the fuse? Thanks again

http://i.imgur.com/RnBpic2.jpg

[nitrocaster]

You're looking at the wrong side of the board. By 'under the LCD connector' I meant 'on the opposite side of the board, under the LCD connector'.
You can order it on Aliexpress.

Also, according to the picture you provided you have X220T, which has different motherboard layout. My picture shows layout of ordinary X230 model (which is similar to ordinary X220).

[RealBlackStuff]

I usually get my fuses faster and cheaper in the US:
http://www.newark.com/littelfuse/046700 ... dp/96H8994
http://www.digikey.com/product-detail/e ... -ND/555286
http://www.mouser.com/ProductDetail/Lit ... bZOA%3D%3D

[allann9]

I usually get my fuses faster and cheaper in the US:
http://www.newark.com/littelfuse/046700 ... dp/96H8994
http://www.digikey.com/product-detail/e ... -ND/555286
http://www.mouser.com/ProductDetail/Lit ... bZOA%3D%3D

Thanks

[allann9]

You're looking at the wrong side of the board. By 'under the LCD connector' I meant 'on the opposite side of the board, under the LCD connector'.
You can order it on Aliexpress.

Also, according to the picture you provided you have X220T, which has different motherboard layout. My picture shows layout of ordinary X230 model (which is similar to ordinary X220).

Thanks I found it and the only fuse that im getting 0 resistance is F2, does that mean I have to replace F6 and F1? Thanks

[nitrocaster]

What are the resistance measurements of F6 and F1?

[allann9]

What are the resistance measurements of F6 and F1?

F6: .8 and F1: 0.L

[nitrocaster]

F6: .8 and F1: 0.L

Which units? What's "0.L"?

[allann9]

F6: .8 and F1: 0.L

Which units? What's "0.L"?

Its just .8 ohms and O.L means Open "Open Loop" . Thanks for you help

[nitrocaster]

Replace only F1. Don't forget to check for a short to ground.

[allann9]

Replace only F1. Don't forget to check for a short to ground.

Thanks!! I will let you know what happens.

[Egido]

Hello. I´m having the same issue with a x230. Just the shipping cost for the fuse is 22€ to spain. I´m seeing the specs is 3v 32A. Would these be compatible? https://www.ebay.es/itm/5-Unidades-Fusi ... SwtAlbuIsW These are available in Spain right now.
Thank you

[RealBlackStuff]

Yes, they would be the correct ones.
Piggy-back solder the new fuse on top of the old one.

[Quake]

You have to check F1 fuse which is under the LCD connector - just measure its resistance. Good fuse has zero resistance.
Here's F1 on X230 board. I have no boardview for X220, but these boards are very similar, so most probably this is how X220 board looks like as well.

https://i.imgur.com/dGiXc2T.jpg

Once you find it, desolder it and put a new one. The whole job can be done using iron, without hot air station or hot tweezers. Before you replace the fuse, make sure backlight power rail is not shorted to ground. To do that, connect LCD cable to the motherboard and measure resistance between ground and both F1 pads. If any measurement is near zero - you have to fix a short before proceeding with fuse replacement.

The links to the pics are no longer working. [Admin note: above link has been fixed]

My f1 fuse also blew, but i don’t see any picture, even when shining a flashlight onto the builtin screen, there is continuity between one of the f1 pads and ground, how do I find the short?

[Quake]

F1 has no continuity and only the right side of it is ground

https://imgur.com/a/AAsvgXC

Could you please expand on “ Before you replace the fuse, make sure backlight power rail is not shorted to ground. To do that, connect LCD cable to the motherboard and measure resistance between ground and both F1 pads.”

I don’t understand which ground to measure from and why the lcd cable needs to be connected.

[axur-delmeria]

F1 has no continuity and only the right side of it is ground

https://imgur.com/a/AAsvgXC

Could you please expand on “ Before you replace the fuse, make sure backlight power rail is not shorted to ground. To do that, connect LCD cable to the motherboard and measure resistance between ground and both F1 pads.”

I don’t understand which ground to measure from and why the lcd cable needs to be connected.

I doubt you'll be getting an answer from Nitrocaster anytime soon. The original thread is from 2016, and Nitrocaster himself last logged in last October.

[nitrocaster]

Sorry for the late response

F1 has no continuity and only the right side of it is ground

https://imgur.com/a/AAsvgXC

Could you please expand on “ Before you replace the fuse, make sure backlight power rail is not shorted to ground. To do that, connect LCD cable to the motherboard and measure resistance between ground and both F1 pads.”

I don’t understand which ground to measure from and why the lcd cable needs to be connected.

Use any ground you find convenient - it's all connected. The LCD cable has to be connected along with the display itself so that you'll be able to tell if there's a short inside the display. In that case replacing the fuse won't fix the problem as it will blow as soon as you reassemble everything back together and power on.