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Thread: Carnetix P1900 Ver. 2.2 w/Mac Mini Core Duo - Startup Problems

  1. #1
    Low Bitrate
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    Carnetix P1900 Ver. 2.2 w/Mac Mini Core Duo - Startup Problems

    I just got the Carnetix P1900 Ver. 2.2 power supply from mp3car that I am using with my Mac Mini (Intel Core Duo 1.6Ghz). I got the Power Button cable (with Y adapter) connected with no problems (I'm using the MacPac cable).

    When I apply the "ignitiion" to the power supply, the power supply fan spins up and the red light begins to blink (meaning it's in "bootup lockout" mode). The power supply is then supposed to send the signal to the computer to power up, but my Mac Mini never comes on. If I manually press the power button after a few seconds, it does start up (i.e. the power supply is properly supplying power to the Mac Mini...it just didn't "switch" it on via the Power Button cable). Once I turn the ignition off, the computer properly begins the shutdown process. This tells me that the Power Button cable is correctly hooked up since it DID receive the shutdown pulse, it's just not working for start up...

    To make sure it wasn't just a delayed bootup, I waited about 2 minutes and the machine never booted up on it's own. With the machine still off, I turn "ignition" back off. Within a few seconds, the machine starts to boot up! I'm assuming the ACPI (power on) pulse (normally for shutdown) is being seen by the Mac Mini, so it begins its bootup. However, the power supply is now in shutdown mode and turns off the power after 60 seconds. I believe I have the Power Button wired correctly to the power supply since the Mac Mini saw the pulse when the power supply was trying to signal a shutdown.

    Anyone else having the problem I'm having? Anyone successfully get the p1900 working with a Mac Mini Core Duo? How about specifically getting v2.2 of the p1900 working? Could there be something I'm doing wrong?

    Sorry for the long drawn-out post. :-) Any help would be much appreciated!

    Thanks,
    Brian Doherty

  2. #2
    FLAC
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    Just to add my 2 cents.....

    Brian *has* asked us if we've seen this phenomenon, and we have not. If anyone has had experience with the Mac Intel + P1900 (any version, the startup delays are all identical) please let us know. Are you experiencing any intermittent startup issues? Does you Mac exhibit the symptoms Brian describes? Feedback appreciated....
    MikeH

  3. #3
    Newbie Jagwire's Avatar
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    this happens to me too, and i've already posted in the carnetix forums as well :-/ any advancements?

  4. #4
    Maximum Bitrate GoHybrid's Avatar
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    i am running a p1900 v2.1 with an intel core duo mini. No problems at all. I desoldered the R46 resistor, flipped the board over and soldered an 1/4W 3.3K resistor between the iSense and GND pins on the harness receptacle. I bench tested with a 12V hobby battery. I connect PWR and GND... nothing as expected... then apply 12V to the yellow IGN wire... boots right up. No problems at all. Take away IGN.... if it's not in lockout, it shuts right down. It works great. Soldering the resistor to the bottom of the board i think is key because it's pretty easy to get a cheesy solder joint at the top that pharks up the resistance... not to mention you don't have to cut into your mac pac cable. There's plenty of clearance and a nice plastic insulator underneath the board too.
    Et ipsa scientia potestas est.

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  5. #5
    Newbie Jagwire's Avatar
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    i've got the p1900 v2.1 with a core solo and macpac. I did the 6.8k resistor mod and everything seems to work besides the initial startup pulse sent to the mac, i'm not sure whether or not i want to take off the 6.8k resistor and R46 and just replace them with the 3.3k maybe if someone can confirm this is the problem...

  6. #6
    Maximum Bitrate GoHybrid's Avatar
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    part of me thinks that since resistors have a tolerance and not an explicit value, using two resistors in parallel could create a larger deviation from the target value than using a single resistor. I imagine if the resistance gets too far outside of what iSense is looking for, you might have intermittent issues depending on the joint quality, temperature, actual resistor value etc...
    Et ipsa scientia potestas est.

    Worklog for my 2007 Civic Si ...f*** it...
    Pictures of the Corolla (retired)here
    Need to make something? Here are a few ideas.

  7. #7
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    I have the very same issue as mrclean12. I have the same setup as well (ver. 2.2) As of right now I have to switch the mini on by hand...and that aint fun. Anybody get any ideas yet on what is the issue?

  8. #8
    Constant Bitrate godraj's Avatar
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    I'm having the same issue. But to go into more detail: if the mini is sleeping when the car is off, applying ignition will wake the mini up. However, if the is shut off while car is off, applying ignition will NOT turn on the mini. I have version 2.1 of p1900 with a 3.3K resistor on the underside of the board.

  9. #9
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    same problem, ver 2.2. This is the last part of my intial set up that is not working just right yet. Any luck yet.

  10. #10
    Newbie Jagwire's Avatar
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    i had to install an external power button that sends the short signal to the motherboard because the p1900 wont start it up when i turn it on it works but i wish it would work the way it's supposed to

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