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No Backlight on LED screen

Discussion in 'Sony' started by nebage, Sep 27, 2011.

  1. nebage

    nebage Newbie

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    HI all, Im at my wits end, and with Sony also. My screen cracked thanks to the airlines. I've replaced the screen, and now have no backlight. I also tried replacing the hard to find cable, still no joy!, I've check screen model numbers, still no joy, I even put the cracked screen back in and now there is no backlight on that. I found a forum on Dell inspirions on with same issue and they talk about a fuse. I found what I think is the fuse, test with no connectivity, tried a iron solder ball and still no luck! Any ideas, Im out of my frigin mind and SONY want Over $600 odd to fix!

    thanks
    Ben
     
    Ejcriado and jackaxle like this.
  2. lilizerg

    lilizerg Newbie

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    Most likely a fuse issue.
    I just fixed mine (model: VPCEA24FM). EXACTLY same issue: I left a thumbdrive on the keyboard and someone closed the laptop for me == broken screen (the screen still lights up, displays white screen only). I replaced the screen myself, no backlight since then......
    I checked tons of forums, there are a lot of people facing the same issue, but there is not a cure for my exact model, the most close one is some guy replaced a fuse (F7 for his case) on a sony notebook motherboard and fixed it. Others are mostly Dells laptop, they replaced either F1 or F8 depends on the model.
    Enough about the background. The infomation I got from these forums drives me to examine the motherboard of my laptop. I checked carefully and tested most of the fuses on board. Finally found one fuse is blown. That fuse was labeled as F16 near the plug for lcd screen on the motherboard. It should be 0 ohm, but tested as 20 ohm. then I applied a solder blob on it. I know, I should not do that since I have already ordered several small fuses and they are on the way, but I can't wait... It turns out that is the correct fuse! Luckly, my laptop doesn't have any shorts for the screen circuit. It lit up right after I put everything back and pressed the power button.
    I took pics of the location of that fuse for other people who is stucked like I did. But I just registered here, not sure whether I can upload any pics, I will try.
     
  3. lilizerg

    lilizerg Newbie

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    Here are the pics, if they show up properly.
     

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  4. xxGenericSNxx

    xxGenericSNxx Z1 Fanboy

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    Just curious, did you check in your computer?
     
  5. lilizerg

    lilizerg Newbie

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    Oh, I forgot to mention: Since those fuses are tiny, the testing pins of your Ohm meter has to be really clean, especially the tips of those pins, or you can sharpen the tips if you don't mind damaging your Ohm meter. Another thing you need to consider is the motherboard may collect some dust on the fuses which might cause false reading. I found several fuses on my motherboard tested with high or no connectivity first, but after I wiped the fuses with alcohol and sharpened my testing pins with sand paper, they were all tested as good fuses(0 Ohm). Hope this could help you find the correct fuse.
     
  6. doubleaa93

    doubleaa93 Newbie

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    ty lillizerg!! your pictures helped me find the fuse on my sony laptop and the backlight is working now :)
     
  7. stefk

    stefk Newbie

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    Hi to all , i have the same situation here , my laptop is a VPCCW1S1E can anyone tell me where is the fuse in this model? i searched everywhere i only find one under the screen plug on the mobo that says F 1 7 ..? can anyone help ? thanks ....
     
  8. beaups

    beaups New Jack Hustler

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    ^post photos of the board.
     
  9. SOADam

    SOADam Notebook Enthusiast

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  10. stefk

    stefk Newbie

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    [​IMG]
    [​IMG]


    here are some pictures from the up side of the mobo near the screen plug
    thank you all for the reply
     
  11. ngvuanh

    ngvuanh Notebook Deity

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    You need to remove all other parts, then take out just the motherboard.
    Take a clear and high resolution photo of both sides of motherboard.
    Take the area around LVDS (LCD) connector on both sides
     
  12. peacepls

    peacepls Newbie

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    I have replaced SONY VAIO VPCCA290X screen, no back light. I took the battery out while I was doing it. Then I put the old one back. it has back light. It shouldn't be the fuse problem, right? What the problem will be?
     
  13. ngvuanh

    ngvuanh Notebook Deity

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    NO, it's not fuse problem.
    Make sure you have LED LCD. If so, it's LCD problem.
     
  14. luchoz

    luchoz Newbie

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    Alright. this works great. possible fix for all led LCD back-light. because it worked on a dell 1400 series.
     
  15. arlokvtec

    arlokvtec Newbie

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    Hi, i have the same exactly problem with the vpcea24fm, got no backlight after replace the screen, and i already tried two screens and still no backlight, i open the laptop and found the fuse that you showed in the photo but it seems normal... please explain how to do the solder blob.. Sony wants to charge me $600 dollars to do that and the laptop does not worth $400!... Thanks
     
  16. HDPro

    HDPro Notebook Enthusiast

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    Can anyone confirm if this is the fuse that is the trouble maker on my Vaio? Multimeter says its a dud and its located right on the backside of where the LVDS connector is but I need some reassurance :)
     

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  17. HDPro

    HDPro Notebook Enthusiast

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    It was the correct fuse and soldered a bridge to fix it!
     
  18. transformrepair

    transformrepair Newbie

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    I'm surprised but it actually worked. I soldered the F16 fused with a jumper and it works. thanks for the help!
     
  19. thenighthawk

    thenighthawk Newbie

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    Another success story from me, i managed to get work my vaio vpceb4l1e burnt fuse, after 2 hours of work and i found f16 fuse marked with an N sign, soldered it and it worked like a charm. Thank you... Have a nice day :)

    note: i replaced broken screen with battery on, it was the cause.
     
  20. beaups

    beaups New Jack Hustler

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    I'm shocked how many people are replacing lcd screens with power on and/or battery installed. What exactly would prompt somebody to do such a thing?
     
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