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    #1

    hp dv6700 screen flickering

    I'm working on an HP dv6700 laptop, and the screen is flickering. It'll flicker on and off about 3-5 times a second. When it's on, it's a bit garbled. When I plug in an external monitor, it will display fine, with no flickering and not garbled.

    I was thinking it was the inverter board so I replaced that. It didn't help at all.

    It does have Nvidia graphics, and I know these can cause problems. Would this be a symptom of that, or is there something else with the display I need to look at?

    I have an original HP dv6000 with a bad graphics chip that I can pull parts off of if need be. The inverter board was identical, and the LCD looks to be compatible.
    A man convinced against his will is of the same opinion still.
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    #2
    Re: hp dv6700 screen flickering

    Originally posted by acstech View Post
    I'm working on an HP dv6700 laptop, and the screen is flickering. It'll flicker on and off about 3-5 times a second. When it's on, it's a bit garbled. When I plug in an external monitor, it will display fine, with no flickering and not garbled.
    Sounds like you possibly narrowed it down to the LCD on the HP dv6700 itself?
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      #3
      Re: hp dv6700 screen flickering

      Well that's what I was thinking. The problem was that, IIRC, the failure mode of those Nvidia graphics chips was to come unsoldered from the board. I don't know if that would allow the external monitor to work, and the internal one to have an intermittent connection due to the chip unsoldering itself.

      It just seems like the signal to the LCD is bad, not the LCD itself.
      A man convinced against his will is of the same opinion still.

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        #4
        Re: hp dv6700 screen flickering

        Could also be the connector/ribbon cable that goes from the motherboard/video card to the back of the LCD monitor. It's likely cheaper than a new LCD panel, so that's where I would start. They get flexed all the time from opening and closing the laptop, so it's not at all uncommon for those cables to short or have intermittent connections.

        Every case of Nvidia GPU failure I've seen effected all attached displays, internal or external.

        Be careful swapping ribbon cables between models and screens. They don't always have enough conductors to support all resolutions (hardware screen resolution, separate from the desktop resolution). For instance, a WXGA+ (1440x900) cable can send signal to a WXGA (1280x800) screen. However, a WXGA cable cannot always send signal to a WXGA+ screen. The higher resolution cables have more wires in them. If you stick to the same resolution models for replacement parts, you should be fine.
        Last edited by yyonline; 09-08-2010, 03:32 PM.

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          #5
          Re: hp dv6700 screen flickering

          Hi

          Have seen this several times before here are the usual suspects:

          *Bad LCD Matrix (can be eliminated by trying a different screen/External Monitor will imply but not eliminate)
          *Bad LCD to mobo cable (can be implicated if the problem does not occur on external, but can only usually be eliminated by swapping out with a known good cable)
          *Bad inverter (can be eliminated by swapping with a known good inverter, try reflowing the inverter if need be, nothing to lose(make sure you are comfortable with hot air gun before trying)
          *Bad GPU solder joints (more than likely is what is causing the issue, you can be pretty certain that it is a bad GPU if you can replicate the screen garble onto an external, or you cannot obtain external monitor output at all).

          Good luck!

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            #6
            Re: hp dv6700 screen flickering

            Hp pavilion dv series. Nuff said

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              #7
              Re: hp dv6700 screen flickering

              bad gpu problems doesn't fail like that... the way people diagnose a bad GPU (that some people would call for reflow) was that it WON'T work with external monitor.

              I would put the suspect on the CCFL, panel, or the connectors. After securing the connectors I would test the CCFL with a known good inverter first. Then the panel (oh no...)

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                #8
                Re: hp dv6700 screen flickering

                Take the thing apart and toss out the motherboard. Keep everything else. It would be cool if an OEM would make replacement motherboards with GM4500 or similar for the DV6000 and DV2000 series but that won't happen in a million years.

                Again, how nVidia escaped this class action (Who else has with a near 100% product failure rate, with the same problem over many years) is beyond me. Any other company would be bankrupt by now.
                "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

                -Leonid Brezhnev (On the Yom Kippur War)

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