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HP f2105

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    #1

    HP f2105

    Hi all got a small problem with my 21" hp monitor

    First thought inverter board had a bad transformer as there are three to run 6 lamps but they all tested ok so next suspected lamps bingo middle two (which i have circled in yellow) not working or maybe just one of the two as i connected 2 lamps externally and screen worked fine on 4 lamps with an adjustment to the brightness .
    I know i will have to replace one top and one bottom to balance it out but until i have sorted out another monitor so i can fully strip it down to measure bulb length and replace i have heard i can use a resistor across the connections to make monitor run .
    My questions are 1 is it possible and 2 if so what size resistor should i use ,
    this would only be a temp measure until i get sorted .

    Any input welcome thanks in advance
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    #2
    Re: HP f2105

    Originally posted by sabre504 View Post
    My questions are 1 is it possible and 2 if so what size resistor should i use ,
    this would only be a temp measure until i get sorted .
    If I understand this correctly, see

    https://www.badcaps.net/forum/showth...=resistor+fool
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    Comment

      #3
      Re: HP f2105

      Hi thanks for that thought i had heard or read it somewhere .
      Now just gotta check out my stock and see if i have 2resistors that size .

      Will let you know what happens

      Then again if you dont hear from me

      Comment

        #4
        Re: HP f2105

        bad power button board i am sure of it.....i just fixed mine found the answer on cnet forums i thought it was an inverter too but its not...

        Comment

          #5
          Re: HP f2105

          This model is know for having bad lamps (fixed 3 of them), easily broken plastic hinge for the power switch ( fixed 4 of these using RTV to fix the hinge), bad LCD panel (vertical lines). But it does have good pictures when it works.
          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

            #6
            Re: HP f2105

            RTV being ??/to us uneducated English people !!

            Comment

              #7
              Re: HP f2105

              Full term: Room Temperature Vulcanizing Silicone or Sealant.
              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

                #8
                Re: HP f2105

                Ta muchly.

                Comment

                  #9
                  Re: HP f2105

                  Hi Rtech

                  Mine turned out to be the lamps on top of the screen had rotted the earth cables so i picked up another that had a good screen and lamps and swapped them over .

                  So if you need any spares i have a working psu ,inverter and main board in fact i have the whole unit minus the screen and power button as it was broken plus a stand

                  Comment

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