HP 4510s power problem

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  • Dr.Spiegel
    New Member
    • Apr 2015
    • 4
    • Praga
    #1

    HP 4510s power problem

    Hello guys, i see lots of you got really lots of knowledge, so i hope somebody can help me with my notebook.The problem is that i try to switch it on, but after pushing the power button, it stayed absolutely dead, also LED indication in DC conector is not working. I am not clever from this situation but i got schematics and i also wanted to ask you, if u know about some issues of this laptop.

    What i already done:
    1) Tested power supply adapter - works fine, its oK

    2)Measured voltage going from the power supply to mainboard-its ok

    3)Change the LM339 on mainboard, still the same issue

    I am including schematics in this post so please take somebody a look and tell me where the problem can be (FDMC4435, LM393...). Please help
    Attached Files
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    • aanan
      Badcaps Veteran
      • Dec 2010
      • 222
      • India
      #2
      Re: HP 4510s power problem

      check 1st +V5AL on u1021 pin no5 schematic page no5 2nd check page no7 +V3A & +V5A.

        Comment

        • dj_ricoh
          Badcaps Legend
          • Jan 2013
          • 2073
          • uk
          #3
          Re: HP 4510s power problem

          Even with bad bios the light from dc connector wont come on.
          I suggest to start with that.
          Reflash bios chip.
          Just cook it! It's already broken.

            Comment

            • ktmmotocross
              Boardkiller
              • Feb 2014
              • 3572
              • slovakia
              #4
              Re: HP 4510s power problem

              as first even bios need 3.3V ALW power, so i will start from that

                Comment

                • smali
                  Badcaps Veteran
                  • Sep 2014
                  • 287
                  • Pakistan
                  #5
                  Re: HP 4510s power problem

                  my suggestion is first check the voltage main voltage line on Q1031 source or R1262.
                  have you received adopter 19 v on that points?

                    Comment

                    • Th3_uN1Qu3
                      Believe in
                      • Jul 2010
                      • 6031
                      • Romania
                      #6
                      Re: HP 4510s power problem

                      Originally posted by dj_ricoh
                      Even with bad bios the light from dc connector wont come on.
                      I suggest to start with that.
                      Reflash bios chip.
                      Yes, that is correct. But like others said above, check the 3.3v ALW rail first. You can check that on pin 8 of the BIOS chip.
                      Originally posted by PeteS in CA
                      Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                      A working TV? How boring!

                        Comment

                        • Dr.Spiegel
                          New Member
                          • Apr 2015
                          • 4
                          • Praga
                          #7
                          Re: HP 4510s power problem

                          Oh wow! Thanks a lot! I hope tomorrow or in Sunday i will measure every value. Anyway i will report progress!

                          ktmmotocross: Zdravím na Slovensko.
                          Last edited by Dr.Spiegel; 04-17-2015, 06:32 PM.

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