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Laptop Monitor... No Backlight!!!

Discussion in 'HP & Compaq' started by PARKER4, Dec 31, 2007.

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  1. PARKER4

    PARKER4 Newbie

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    I have an HP Pavillion zv5330us, bought in Jan., 05. Recently, the monitor went "black" (no backlight)... yet, when I use an external light source to illuminate it from the front I can see that the computer is 'otherwise' functioning just fine, albeit, very difficult to 'read'. It would appear to be a hardware problem; tho, I'm not sure. After reading of the problems others are having with HP repair work... I'm not too keen on seeking their 'help'. Anyone have a similar problem... or, suggestion of how I might be able to resolve it on my own? Thanx!
     
  2. txqzr4

    txqzr4 Notebook Consultant

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    sounds like the inverter may have gone out. not uncommon.
     
  3. chiaroscurist

    chiaroscurist Notebook Consultant

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    Do you have on-site repair? I'm sure HP will be more careful when operating in front of you. But yeah I would personally recommend against sending it in for repairs. You can complain if something goes wrong and there's a fair chance that they might just replace the whole computer. In your case though, I think sending it in might be the best bet. Replacing the lamp is risky business and it will cost a lot. Send it in, cross your fingers! But before you send it, take detailed pictures of your laptop so you have proof if HP messed up or something. Good luck.
     
  4. chriskmee

    chriskmee Newbie

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    I have had the same problem, let me ask, did it happen after a vista crash?

    To fix mine, although this sounds very weird, it worked. I called up HP and this is what i did. First i shutdown the laptop, removed the battery, removed the ram case, take all the ram out, put one back in, turn computer on (without battery, just wall adapter) It turned on fine, then i shut it down and put my second stick of ram in. I have a dv9500t, hope this helps.
     
  5. PARKER4

    PARKER4 Newbie

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    Hey guys... I'm back in 'business', as it were. Thanks to all of you who responded, except for "chiarocurist" - you had me confused and scared (just kidding). Actually, I was on the verge of either sending it off for repair (scary option, after reading of others' misfortunes with HP, et al), or, buying the parts (inverter board and ccfl) and installing them myself. The problem there is that I would only be guessing whether "both" parts were defective... or just one. But then... which one?
    To make a long story, short... I was all over the web, reading many sites dedicated to this same problem. Most referred to a faulty inverter board or ccfl. A couple mentioned that doggone little 'switch' which shuts down your monitor (puts it in hybernation mode) should you close the lid before 'properly' shutting down 'completely'.
    Well... I had nothing to lose; so I tried "tapping" that little bugger... repeatedly... after noticing that as I did so, the backlight acted as tho it "wanted" to come back to life. IT WORKED !!! I CAN SEE, AGAIN!!!
    Just goes to show ya... oftentimes, it's the little, simple, things that crawl up our butts... and give us fits, but, then the 'remedy' is sometimes... just as simple and close at hand.
    Anyway, once again... thanks to each of y'all for offering your assisstance. I really appreciate it.
     
  6. bakry

    bakry Newbie

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    Hi,

    I am having the same problem but i cant seem to find that little hidden switch.
    Using a HP pavillion dv2024tx. Hope the model type helps in explaining where the damn switch is. lol

    Its driving me crazy
     
  7. PARKER4

    PARKER4 Newbie

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    Hi BAKRY...

    In answer to your query, specifically; go here...

    " http://h10032.www1.hp.com/ctg/manual/c00726464.pdf "

    In the left column, 'expand' the "Components" category... then, choose "Display Components".

    You will see an image representative of your particular HP Model... and in the lower, right corner of the "monitor face" you will find the location of the "switch" ( #4 in the illustration... " Internal Display Switch " ), which is involved in "turning off the display if the display is closed while the computer is still turned on".

    Keep in mind that the location, and physical description, or appearance of said switches is often 'different', from one Model... to the next; as it is between "yours" and "mine". Mine has a tiny rubber nubule sticking up... which is actuated to "disengage" power to the display when the "lid", or monitor, is closed... while the computer is still in the "on" mode. "Yours" has a different 'configuration' than mine... al beit, the 'function' serves the same purpose... and accomplishes the same end result. Refer to your "owner's manual, or handbook, for, perhaps, a better description or illustration of the function in question.

    BTW... That particular "fix" was only temporary, in my case (dammit). Didn't last very long. Ultimately, I paid a visit to a Salvation Army store where I purchased a "Dell - 15in. CRT color display" for a whopping $10.00... and hooked it up to the VGA port on my laptop. It works just fine... as a home-based display. This remedy will at least "keep you going", in the interim.
    I know... it doesn't resolve "our" real problem... but, it is a temp. fix, until we either decide to bite the bullet... or bury the damn thing in the backyard.

    Hope this helps... Parker
     
  8. PARKER4

    PARKER4 Newbie

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    CHRISKMEE...

    Sorry for such a late response; but, no it had nothing to do with "Vista".
    I don't use Vista. I've heard that far too many people have had nothing but problems after attempting to switch over to Vista... from "XP - or, XP-pro".
     
  9. Wujohn

    Wujohn Notebook Consultant

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    Just to add to this...my inverter board went bad on my HP. When I held a flashlight to the screen at an angle I could see my desktop. The screen would occasionally work, occasionally not work...until ultimately it completely failed.

    The PCB inverter board on my laptop is right underneath the area of the button you mentioned is...so tapping there could also affect the inverter board.

    My repair cost me $10-$15 and 45 minutes of careful disassembly. You can get instructions off the HP site on how to take apart your lappy.
     
  10. PARKER4

    PARKER4 Newbie

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    Wujohn,

    You state: "My repair cost me $10-$15 and 45 minutes of careful disassembly. You can get instructions off the HP site on how to take apart your lappy."

    Could you please be more specific, relative to getting the info on disassembling my particular laptop? I've found nothing from HP. Apparently, I'm looking in the wrong place. Please assist... as I'm anxious to get this thing resolved... without destroying my 'machine'. Thanx.

    BTW...I did the same thing, shine a light across my screen, so that I could read e-mail and try and research the nature of the 'problem' and to look for a solution, via the web.

    PARKER
     
  11. Wujohn

    Wujohn Notebook Consultant

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    I hope this helps...good luck.

    Here is the link for the maintenance manual.
    http://www.hp.com/ctg/Manual/c00212209.pdf

    Here is a link to a site where someone created a self help guide for your exact model to replace the inverter board.
    http://www.userinterface.com/instruc/pavilion/pavilion.html

    This looks like your part here - feel free to double check me on this
    http://cgi.ebay.com/NEW-HP-Pavilion...543691QQcmdZViewItem?IMSfp=TL0808021152r29726


    My recommendation is to be patient when taking apart your computer and at some point you will likely have to use more force than you think necessary to pry apart a piece...just be careful, make sure you follow the directions and it will go fine.
     
  12. RealtorKen

    RealtorKen Notebook Consultant

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    This is happening to me on a 1 day old laptop now
     
  13. Wujohn

    Wujohn Notebook Consultant

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    That would be odd for a brand new laptop. Can you describe the symptoms?
     
  14. RealtorKen

    RealtorKen Notebook Consultant

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    My screen randomly looks like someone put like 4 of those anti-glare things they used to make for regular monitors (also known as the privacy shields)

    I've tried to time when it happens and the intervals but there is no rhyme or reason to it. I've ran memtest, and that came up clear.

    If once the lamp goes out, I hit the power button so it goes into sleep mode, I can wake it up and the lamp comes back on. So every time it would happens I would just do that...Extremely annoying for a day old laptop
     
  15. PARKER4

    PARKER4 Newbie

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    Wujohn... Thank You Very Much; Precisely What I Was Seeking.
     
  16. PARKER4

    PARKER4 Newbie

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    Realtorken... I Don't Get It. Why Would You Tolerate Such Nonsense From A 'brand New', One Day Old Computer? Surely, It Came With Some Degree Of Warranty Protection. Why Didn't You Simply Return It... Immediately?
     
  17. Wujohn

    Wujohn Notebook Consultant

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    I cannot say for sure but it sounds like one of the following:

    Bad bulb
    Loose connection
    Inverter board

    Can you plug it into an external monitor to rule out a bad video card?

    Looks like you have been having some problems with HP anyway; could you just return the laptop?
     
  18. RealtorKen

    RealtorKen Notebook Consultant

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    Is it possible that the power cord is related to this issue? It hasn't happened in a couple days and then I used the power brick that I keep in my bag and bamm it happened... I am not sure if it coincidence yet...
     
  19. xanlexian

    xanlexian Notebook Consultant

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    I had an identical situtation on my old Dell Inspiron 8000. It turned out to be a loose connector (from the display to the video card inside the notebook). The connector was also a little warped from heat (being on constantly for almost six years) that I also had to "lock" the connector down to its socket on the video.

    If you are comfortable opening your notebook, these types of cables are typically easy to access. I'd CERTAINLY download the service manual to your notebook -- even if you think you know what you're doing.
     
  20. xiaozhu

    xiaozhu Notebook Enthusiast

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