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Invid PN1B-8X8NH Nvr Unknown IC

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    #1

    Invid PN1B-8X8NH Nvr Unknown IC

    Trying to identify this IC near the 12 and 5 volt connector. It is marked MDME and looks to be some kind of voltage regulator for the 12 and 5 volt rail. This is located in an Invid Nvr #PN1B-8X8NH. As you an see from the picture it is a 6 pin small ic. Any help is appreciated.
    Attached Files
    Tags: None
    #2
    Re: Invid PN1B-8X8NH Nvr Unknown IC

    Looks like a Ricoh RP154N028B Small dual ldo regulator outputs of 2.8v(pin1) and 1.0v(pin4) input (pin2)
    The picture is too out of focus to be of much use.
    Attached Files
    Last edited by R_J; 08-13-2023, 07:54 PM.

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      #3
      Re: Invid PN1B-8X8NH Nvr Unknown IC

      Thanks Rj. Will check the output pins but pins 4 and 5 have 12v and 5 volts if not mistaken. Will get a better picture up. Thanks.
      Last edited by Herbssat; 08-13-2023, 09:31 PM. Reason: Wrong output

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        #4
        Re: Invid PN1B-8X8NH Nvr Unknown IC

        Here is a pinout and voltage reading for this ic acquired from another nvr.
        Pin 1 - 0.600vdc
        Pin 2 -11.96vdc
        Pin 3 -0.00
        Pin 4 -12.09vdc
        Pin 5 -5.0vdc
        Pin 6 -8.20vdc

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          #5
          Re: Invid PN1B-8X8NH Nvr Unknown IC

          I guess that is not the ic, it might be a custom marking? does the other nvr have the same ic top markings?
          What are the ic voltages on the non working nvr?
          Pin 3 seems to be ground, are 2 & 4 connected together? pin 1 looks like a control line?
          Last edited by R_J; 08-14-2023, 07:05 PM.

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            #6
            Re: Invid PN1B-8X8NH Nvr Unknown IC

            Actually not Rj. Looks like the other nvr has the marking beginning with NY. It is burned so i cant read the full marking. Same circuit though. This is a pain finding these tiny components while the schematic diagrams are somewhere locked away. Thanks for trying to help.

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              #7
              Re: Invid PN1B-8X8NH Nvr Unknown IC

              There is no continuity between pins 2 and 4. Thanks.

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                #8
                Re: Invid PN1B-8X8NH Nvr Unknown IC

                NY seems to be a Ricoh R5323N030A which has a different pinout
                Attached Files
                Last edited by R_J; 08-14-2023, 07:33 PM.

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                  #9
                  Re: Invid PN1B-8X8NH Nvr Unknown IC

                  Pin out is the same on both boards even though I can't determine voltages on the non working board. Same inductor and capacitors on both boards. Looks like a lot of these markings are cryptic as none of the databases show them. Hard to fix something when components can't be identified.

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                    #10
                    Re: Invid PN1B-8X8NH Nvr Unknown IC

                    Try and draw out the circuit if you can, then it might make more sense. I can't see where the pins go or what components are connected to it based on that picture.
                    Last edited by R_J; 08-15-2023, 10:01 PM.

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                      #11
                      Re: Invid PN1B-8X8NH Nvr Unknown IC

                      Here are some more pics. Thanks for your assistance.
                      Attached Files

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