HP CQ70 no Backlight

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  • LittleJo
    New Member
    • Oct 2012
    • 1
    • Ireland

    #1

    HP CQ70 no Backlight

    Hi, I have problem with the screen backlight, tryed to change screen cable and inverters and still no backlight. Please help!!!
  • artois7
    Senior Member
    • Mar 2011
    • 159

    #2
    Re: HP CQ70 no Backlight

    CCFL tube in the screen is gone. Replace the panel.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: HP CQ70 no Backlight

      http://lcdparts.net/howto/troublesho...ptopCCFL1.aspx
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

      Comment

      • Pascal Komlassan
        Badcaps Veteran
        • Jan 2017
        • 806
        • TOGO

        #4
        Re: HP CQ70 no Backlight

        Please i need the bios of CQ70

        07263-1
        Vitas MB
        48.4I501.011
        Last edited by Pascal Komlassan; 02-11-2017, 03:21 AM.

        Comment

        • jasko_jacker
          Badcaps Legend
          • Oct 2014
          • 1137
          • italy

          #5
          Re: HP CQ70 no Backlight

          Check if the backlight voltage is present, pay attention to don't short the circuit.

          Originally posted by LittleJo
          Hi, I have problem with the screen backlight, tryed to change screen cable and inverters and still no backlight. Please help!!!
          Attached Files

          Comment

          • lepak06
            Senior Member
            • Feb 2017
            • 51
            • france

            #6
            Re: HP CQ70 no Backlight

            Hi ,

            i've the same problem with an laptop CQ70 .
            I tried to change LCD panel, Inverter, LVDS cable and the same problem no backlight.

            I tested if i have 3VS but no 3VS on LVDS and when i check the motherboard i seen the D21 and D22 are missing. On pad ( printed trace) of D21 and D22 on the motherboard i found 3VS but not on C364 and not on C374.

            I tried to jump on motherboard the lines of D21 and D22 each separately without any result.

            Comment

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