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hp pavilion f70 backlight

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    #1

    hp pavilion f70 backlight

    The backlight on this thing cuts off and on until it gets to the welcome screen and then cuts off completely. I've decided to replace the caps on the board feeding the lights but the miserable truth is that I don't know how to identify them well enough to order them.

    They're 16v, 220uf; 8mm wide, 8mm high. Green cover, marked LELON; 105 degrees. The esr is reading from .5 to .1.

    There are 4 more caps, white plastic rectangles 8mm high, 7 wide and 3 deep. ESR is about 7ohms on these.

    I know I should post a picture but don't have a digital camera_ which I guess I'm going to have to get at some point.
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    #2
    Re: hp pavilion f70 backlight

    Originally posted by styxbound View Post
    The backlight on this thing cuts off and on until it gets to the welcome screen and then cuts off completely.
    Try this so we get a better understanding of what is going on. Power off everything.

    Hookup your computer to the LCD. Power up computer. Wait 2 minutes. Now turn on LCD.

    1) Does it show the display?
    2) Does the LCD go black after 1 or 2 seconds?
    3) Can you see the display if you shine a flashlight on it?
    4) Does the power LED stay green?
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    We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

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      #3
      Re: hp pavilion f70 backlight

      Appreciate the reply, retiredcaps. Did your test and you're right on. The desktop comes up briefly, screen goes dark and button yellow but the image is still there under a light. You're battin' a thousand so far!

      Comment

        #4
        Re: hp pavilion f70 backlight

        Originally posted by styxbound View Post
        Appreciate the reply, retiredcaps. Did your test and you're right on. The desktop comes up briefly, screen goes dark and button yellow but the image is still there under a light. You're battin' a thousand so far!
        Okay, depending on how long the desktop screen shows up, you could be experiencing 2 seconds to black. I'm in the process of updating this to version 0.2, but 0.1 is at

        https://www.badcaps.net/forum/showthread.php?t=10419
        --- begin sig file ---

        If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

        We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

        Please do not post inline and offsite as they slow down the loading of pages.

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          #5
          Re: hp pavilion f70 backlight

          That'll give me something to work on for awhile! Who wants a simple life anyway!

          I suspect I'm going to find out the same thing about lcds I found out when I was learning computers: its the ones which kick you around the block pulling your hair out which are the best to work on because they have something to teach you. And they do a great job of restoring a proper sense of humility!

          Thanks for the great info; I'm going to work on it.

          Comment

            #6
            Re: hp pavilion f70 backlight

            Originally posted by styxbound View Post
            its the ones which kick you around the block pulling your hair out which are the best to work on because they have something to teach you. And they do a great job of restoring a proper sense of humility!
            I totally agree. Troubleshooting hard problems is really challenging, but you learn a lot and I find it worthwhile for that knowledge.
            --- begin sig file ---

            If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

            We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

            Please do not post inline and offsite as they slow down the loading of pages.

            --- end sig file ---

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