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    dv9700 - power cycles on and off repeatedly

    Discussion in 'HP' started by ibconfuzzled, Dec 27, 2009.

  1. ibconfuzzled

    ibconfuzzled Newbie

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    A friend gave me his HP Laptop to look at. When the power button is depressed, the power will cycle on/off repeatedly - on for 3 sec. off for 5 sec.

    The only way to power down the laptop is to unplug the power cord and then remove the battery.

    When the laptop is in the "power cycle" I will hear one "clunk" coming from the vicinity of the DVD player although it could be from the cooling fan.

    There is absolutely no display and the only way I have found to break the power cycling without removing the cord and battery is to depress the LEFT SIDE CTL & ALT keys 4 times as the power cycle is first begining. This will cause the power to remain on. However, NOTING else will happen. No display, nothing loading from bios or HD etc. I can open the DVD drive and insert a CD/DVD and the drive will wind up but nothing will happen.

    The exact same thing will occur with the RAM alternated or removed completely. It will also occur with the HD removed. It also occurs with the RAM & the HD removed at the same time.

    Any suggestions would be greatly appreciated.
     
    ibconfuzzled, Dec 27, 2009
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  2. brianstretch

    brianstretch Notebook Virtuoso

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    NVIDIA GPU? This could be an unusual symptom presentation of the usual defective NVIDIA chip problem.
     
    brianstretch, Dec 28, 2009
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  3. ibconfuzzled

    ibconfuzzled Newbie

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    Thanks for the reply brianstretch. Any other ideas? Any suggestions as to what I might try to repair it? Anyone?
     
    ibconfuzzled, Dec 29, 2009
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  4. Th3_uN1Qu3

    Th3_uN1Qu3 Notebook Deity

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    It's exactly what i had on that dv9420us. Solution? Bake it. :D And put copper shim instead of crap thermal pad. See: http://forum.notebookreview.com/showthread.php?t=440765

    I did 7 minutes at 190C first time, worked for a bit then stopped after i powered it up after i brought it from outside, since i went to a shop to have the new top cover (with touchpad) installed. This proved my theory that it's thermal shock that cracks the solder.

    My fatal mistake was that i didn't do the copper shim and thus the solder had room to move, as the stock thermal pad offers little pressure to the chip. So there went Run #2: 7 minutes, 210C this time. Copper shim in. Warped the board a fair bit but seems to run fine. The laptop has been returned to the owner a few weeks ago and no news is good news.
     
    Th3_uN1Qu3, Dec 29, 2009
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