Invid PN1B-8X8NH Nvr Unknown IC

[Herbssat]

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.

[R_J]

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.

[Herbssat]

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.

[Herbssat]

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

[R_J]

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?

[Herbssat]

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.

[Herbssat]

Re: Invid PN1B-8X8NH Nvr Unknown IC

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

[R_J]

Re: Invid PN1B-8X8NH Nvr Unknown IC

NY seems to be a Ricoh R5323N030A which has a different pinout

[Herbssat]

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.

[R_J]

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.

[Herbssat]

Re: Invid PN1B-8X8NH Nvr Unknown IC

Here are some more pics. Thanks for your assistance.