No Backlight on LED screen

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

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  1. ngvuanh

    ngvuanh Notebook Deity

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  2. zumnao

    zumnao Newbie

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    Hi @ngvuanh hope you're there!

    Thanks in advance as following this thread I've been able to find and fix blown fuse at a Sony Vaio VPCSA3L9E laptop.

    But my problems din't finish there, let me explain the hole picture:
    I'm fixing this laptop for a friend. It had one or two lines crossing the screen up to down, I though it was a bad connexion as when twisting screen it tended to change, at times no lines other times some more. So unmounted screen panel an pressed plug, some times lines disappeared but unfortunately once the plug was off and plugging it back the screen turned black, but could notice some shadows.

    I bought a new screen but this one, when plugged, was completely black, I asked for return but a guy at the store pointed the fuse as a possible cause. Now that fuse is bridged the old screen works but with much more lines and the new screen do not work.
    I'll include links of both screens behaviour videos.
    At this point I need some advice as I remember the guy at the store saying that by connecting the new screen to a blown fuse laptop I could have damaged it, my common sense says this is not possible as a blown fuse sends nothing, no signal nor electricity, to the screen. And the fact that the old screen still works confirm that point. But I look for a much more experienced opinion in order to negotiate a return screen if needed.




    Thanks a lot!!
     
    Last edited: Jan 10, 2016
  3. johnyb98

    johnyb98 Notebook Enthusiast

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    Hello, and have a healthy new year!!

    Please, I need your help!! I have a problem with a notebook monitor. From my experience to the post, I find it ideal to ask for your help.

    Videos are shooted by cellphone camera.

    From falling down laptop, screen is flickering in many many points. You can see in the following two videos (I did the best I could with the cellphone camera):








    and an image as far as it concerns first video:

    [​IMG]


    On the other side, when I connect laptop in an external monitor with VGA DIN-15 connector, screen resolution is centralized, and the image is totally clear. No flickers (following two videos):








    The one that I do not know, and want to ask, is:if sb has a notebook, which has a damaged monitor, it indeed happens? I mean, if he connects notebook via VGA connector to an external monitor, the screen resolution on the damaged monitor is centralize and clear?
    Below I quote the notebook monitor image when connected to the VGA monitor (green rectangle:full monitor screen - red rectangles are the lost surfice from left+right centering)

    [​IMG]

    And another very important I should report:the flickers are made also in BIOS. There, no drivers are loaded.

    Notebook features

    -Notebook Model:HP Pavilion 17 Notebook PC
    -Product Number:E9L98EA#AB7
    -System Board ID:213B
    -Processor Type:AMD A4-5000 APU with Radeon(TM) HD Graphics
    -Processor Speed:1500MHz
    -AMD Radeon HD 8330

    So, what is your opinion about all that? Monitor needs replacement?

    Thank you for your time!
     
  4. dulca

    dulca Newbie

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    this is an lcd or flat cable problem... however this SONY section, not HP
     
    Last edited: Jan 10, 2016
  5. dulca

    dulca Newbie

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    I also have backlight problem and not find the fuse on sony vaio F 152
    SVF152C29M (PART NUMBER/S : 31HK9MB00W0 / A1951374A / da0hk9mb6d0 )
    [​IMG]
     
  6. dulca

    dulca Newbie

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    not find any "F" .... only "C" or "L"
     
  7. johnyb98

    johnyb98 Notebook Enthusiast

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    Well, thank you for your answer. I also think that it's about LCD screen or the flat cable. But, since screen displays images perfect when notebook connected to exrernal VGA monitor, most possible is LCD cable. Because, if screen was damaged, wouldn't it have to show the same images in flickers when connected to external monitor? Of course this is just what logic says. Cannot prove this.
    I know here is Sony section. Sorry for any confusion, but from your answers to the whole post, and being kind of desperate, I asked here.
     
  8. dulca

    dulca Newbie

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    no because when you use double connection (vga+lcd) the laptop change resolution/ratio/frequency on lcd (in fact the image is centralized...),
    so is not the same state.... your lcd couldn't work in a particulary condition of resolution/ratio/frequency ..... idem for cable....

    or simply the cable is not right connected or needs a thickness
    http://www.informaticanapoli.it/righe-verticali-su-display/
     
  9. dulca

    dulca Newbie

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    answer myself:
    the fuse F2 was on the back, I bypassed it and now LCD work perfectly
     
  10. zumnao

    zumnao Newbie

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    I was about to tell you to look at the back, I'm glad you found it, congrats.
     
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