HP Pavillion 23" AIO won't power up, Motherboared PWR LED flashes briefly!

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  • pclaptop
    Member
    • Dec 2014
    • 13
    • US
    #1

    HP Pavillion 23" AIO won't power up, Motherboared PWR LED flashes briefly!

    I'm hoping someone else has had this problem or has seen/heard of it before.
    I have an HP Pavilion 23-H TouchSmart All-In-One computer that won't power up. Initially I believe it took a power surge and cooked the mother board and power supply.
    I have replaced, Motherboard, CPU, and Ram, CMOS battery and the power supply(with a genuine HP OEM unit).
    Whereas before when I first looked at this unit there was nothing happening, no lights, fans, boot up, NOTHING.
    VOM confirmed power supply was dead.
    I installed all of the above new replacement components and the ONLY sign of life is the onboard motherboard PWR LED briefly flashes. I'm assuming as in other motherboards this light needs to STAY lit. IT DOES NOT.
    This type of AIO computer was very problematic and was discontinued after 2yrs. One of the many problems was a faulty power on switch mounted on the upper left outside frame. But again VOM says micro switch is functioning correctly on this unit, but without motherboard power (as indicated by PWR LED inside yellow circle on attached pic) how can it boot up?
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    Last edited by pclaptop; 09-17-2017, 05:04 PM.
    Tags: None
    • pclaptop
      Member
      • Dec 2014
      • 13
      • US
      #2
      Re: HP Pavillion 23" AIO won't power up, Motherboared PWR LED flashes briefly!

      To all who maybe able to help, the one thing that defeats the "bad/defective POWER On/Off switch" (as the cause) is that with that scenario, the PWR LED next to the power in jack is LIT.

      For some reason with all NEW components in this HP23 Touchsmart, that same PWR LED only flashes momentarily and then goes out.

      Is it safe/correct to assume that if the PWR LED is NOT lit, there is no power to the motherboard? So even if the bad/defective POWER on/off switch was functioning OK, it wouldn't have an energized motherboard to turn on?

        Comment

        • Th3_uN1Qu3
          Believe in
          • Jul 2010
          • 6031
          • Romania
          #3
          Re: HP Pavillion 23" AIO won't power up, Motherboared PWR LED flashes briefly!

          You got a defective mainboard.
          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

            • pclaptop
              Member
              • Dec 2014
              • 13
              • US
              #4
              Re: HP Pavillion 23" AIO won't power up, Motherboared PWR LED flashes briefly!

              th3 un1qu3, it's a brand new motherboard, not that it is impossible for it to be bad, just highly unlikely.

              What about the power supply(which is new too)? It is an HP OEM, bad switching power supply design?

              btw thanks for reply

                Comment

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