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How-to: Lenovo Laptop Dim LED Screen Backlight Fuse Repair

Updated on January 12, 2013

Screenshot of Lenovo Motherboard

screenshot of lenovo motherboard screen connector with fuse location indicated by white arrow
screenshot of lenovo motherboard screen connector with fuse location indicated by white arrow | Source

How to identify the cause of your dead laptop screen

If you have a Lenovo laptop with a Dim Backlight, and the desktop is faint but visible this usually means that the main components of the motherboard are working fine. If you look in the photo above you can see the arrow pointing at the fuse on a lenovo laptop motherboard

However there could be a bad fuse, and in order to determine which part to troubleshoot you need to determine if you have one of two types of LCD Screens for laptops CCFL, and LED style screen, if you have the LED style screen the cause is most likely a blown fuse on the motherboard. In most cases newer laptops, are using a LED style back-light instead of CCFL‘s, which negates the need of an Inverter, so now manufacturers are placing a fuse on the motherboard, to protect the screen from surges. However sometimes a momentary problem can blow this fuse, and kill power to the screen rendering the computer unusable. however with a little time, and a lot of heat (soldering) you can replace this puppy. Identifying the proper fuse and replacing it will safe you hundreds in repair costs. when you don't want to attempt this computer repair yourself, you may be able to find a local shop that will do this type of soldering, which is still cheaper than a replacement motherboard.

If you have the CCFL Style screen (the short definition is that it is a compact fluorescent bulb). In this case it could be a bad inverter. The inverter is comparable to the ballast in your everyday shop lights, it ramps up the voltage in your laptop high enough in order to allow it to fluoresce and provide light behind the screen.

Leave me a comment if you have any questions, I have identified numerous fuses on various laptops. If your model isn't addressed here, leave a link to a High-Res photo of your board, and I'll see what I can help you find.

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      kabraham@porgerajv.com 3 months ago

      Where will I find the screen fuse on a Lenovo motherboard? Will I still enter to BIOS if this fuse is ok? If I can go into windows using a external screen, what does that mean?

    • profile image

      Bob 6 months ago

      I have a couple of X220 Tablet laptops with dim display. The content is slightly visible when you shine a torch light. Can you help to identify where lie the problem?

    • profile image

      Roland 9 months ago

      Mr. Michael. can you point that fuse on motherboard of T 410 ?

      If you can with bigger pic and which part of that motherboard.

    • nwapchelp profile image
      Author

      Michael Reid 10 months ago from Farmington, AR

      The steps are going to be similar to the above. If the symptoms look as if they are related to a blown fuse:

      External monitor works fine. You can see icons and background with a flashlight etc.

      To fix it yourself you will need to be comfortable with.

      Complete safe disassembly of the laptop to remove the motherboard.

      Locate and Test the Fuse that is on the circuit that provides power to the screen.

      Ability to desolder and solder on a new fuse if the original one proves to be faulty.

      The good news is that if this fails you are in a good position to buy a refurbished or used motherboard off of ebay, and replace the motherboard since you've already removed it.

      Best of Luck

    • profile image

      Luke purnell 10 months ago

      I have this issue with thinkpad x201s. Could someone please share any specific information for this model and what steps are needed in order to complete the fix?

    • profile image

      naveedansari 16 months ago

      Lenovo Laptop Dim LED Screen Backlight

    • profile image

      mada 18 months ago

      Hi,

      Please give me a feedback to my problem .

      My DIM screen is very low but still show something if I put a flashlight on it. The screen is an LCD, what could be the problem?

      Thank you

    • profile image

      Marcio Avlz 18 months ago

      Hi, Thank you for this nice article. This problem seems very common in this model and I would be grateful if someone would give information on where to find the fuse on the Lenovo T420 equipment. Number and any other information on how to find it. Thank you for this help!

    • nwapchelp profile image
      Author

      Michael Reid 21 months ago from Farmington, AR

      If replacing the fuse didn't work, may need to start testing the mosfet's.

    • profile image

      remus 21 months ago

      hello. i have problem whit my lenovo x201, i change fuse f1, but still dont work, when I put the machine i have 20v in that fuse....can you help me pls?thx,

    • profile image

      pcbjuan 2 years ago

      Hello, I have the same problem with an acer aspire one d270

    • nwapchelp profile image
      Author

      Michael Reid 2 years ago from Farmington, AR

      Ryo, yes, they are cheap and easy to source online. I apologize to those I haven't replied to, but I haven't been able to identify the fuses on other motherboards, I don't have access to a lot. I post mainly on those I have specifically fixed, or found the location of myself.

    • profile image

      ananya 3 years ago

      Thank you for this info! Do you have any pointers for a thinkpad X201?

      @MeM: Were you able to isolate the problematic diode or MOSFET?

    • profile image

      Ryo 3 years ago

      Thanks for this. Fixed my problem with a X201i I was repairing for a friend.

      The fuse is usually labeled "F1." F is obviously stands for Fuse. On mine, there was even a label under it that said "3A/35V." So replace with a same rating fuse is recommended.

    • profile image

      PRINCE 3 years ago

      How to find a blown fuse in HP 650

    • Debra Baginski profile image

      Debra 3 years ago from Cowden,Il

      I have a Toshiba Satellite L305D-S5928 that has been giving me tons of trouble, first it was the heatsink and now that I replaced that the screen will not come on. I have taken the batteries out and held the power button down, and put them all back more then once and nothing happens. I have hooked it up to a desk top monitor and I don't see a thing. It has a LCD screen and I didn't understand what you said to do with them, was it replace the inverter and see if that's the problem?

    • nwapchelp profile image
      Author

      Michael Reid 3 years ago from Farmington, AR

      I don't know specifically I have not had to search for it on that model

    • profile image

      rodka 3 years ago

      Hi,

      do you know where is fuse for LCD on T420 motherboard? Thank you very much! :-)

    • nwapchelp profile image
      Author

      Michael Reid 4 years ago from Farmington, AR

      Don't forget to examine the Mosfet's these also can blow, are much bigger and in some cases show the problem a little easier.

    • profile image

      MeM 4 years ago

      Hello, I have the same problem with an x201. I stripped this thing down to the motherboard, and I think I have checked all the fuses. Several surface mount fuses. But they all seem to be good. I can see the display is working, very dark and dim, but it's functioning. Is there any other problem I might be missing?

      Thanks, if you can find the time to comment.

    • profile image

      Uri 4 years ago

      Hi,

      Please let us know how to find a backlight fuse on the x220.

      It doesn't make sense to throw away a working computer just over a fuse.

    • profile image

      uri 4 years ago

      joinning the question for x220.

    • profile image

      Nuri form Germany 4 years ago

      How can i find a blow fuse , I have a Lenovo t420