Just curious about the new red light on the magsafe plug on the late 08 MBP

Discussion in 'MacBook Pro' started by damado, Oct 19, 2008.

  1. damado macrumors 6502

    Aug 8, 2006
    I bought the new L808 (late '08) MBP a couple of days ago and when charging, the LED on the magsafe plug has always been orange then green once it's charged.

    Today, 2 days after owning it, I now see it turns green when I plug it in, then 2 seconds later it goes to red instead of orange. It still goes back to green when fully charged, but I'm just curious as to why it decided to charge with a red LED instead of orange. I guess I'm wondering if it's an indicator of some malfunction.

    Any ideas?

    Here's the battery info screen:
    Battery Information:

    Model Information:
    Serial Number:
    Manufacturer: SMP
    Device name: bq20z951
    Pack Lot Code: 0000
    PCB Lot Code: 0000
    Firmware Version: 002a
    Hardware Revision: 000a
    Cell Revision: 0100
    Charge Information:
    Charge remaining (mAh): 4569
    Fully charged: Yes
    Charging: No
    Full charge capacity (mAh): 4581
    Health Information:
    Cycle count: 3
    Condition: Good
    Battery Installed: Yes
    Amperage (mA): -503
    Voltage (mV): 12432
  2. abijnk macrumors 68040


    Oct 15, 2007
    Los Angeles, CA
    I saw your post and was curious since I had never heard of this before. A google search doesn't show anything useful. I would call Apple and see what they say. Then, let me know to satisfy my curiosity. :D
  3. Aniki macrumors regular

    Oct 17, 2008
    eh, my mac charges but doesn't light up at all :(
  4. LinMac macrumors 65816

    Oct 28, 2007
    I'll second the curiosity. I haven't seen any colors except orange and green from my magsafe charger.
  5. bcaslis macrumors 68020

    Mar 11, 2008
    All my MacBook Pros (including the latest) have charged with a red light. I've never seen an orange.
  6. eba macrumors regular

    Mar 14, 2007
  7. upsguy27 macrumors 65816


    Jun 25, 2007

    Attached Files:

  8. damado thread starter macrumors 6502

    Aug 8, 2006
    Wow, broad range of responses from no light to only red to only orange...

    I'll ask apple when I go back to pick up my ACD monitor that's in for service.
  9. TXBDan macrumors regular

    Oct 19, 2008
    Boston, MA
    I just got a clearanced old MBP and my magsafe charger also shows a red light while charging and green when fully charged.

    It *might* pass as really dark orange, but no way its amber.
  10. NATO macrumors 68000


    Feb 14, 2005
    Northern Ireland
    At least you can see what colour it is! I find that my colour-blindness means I can't distinguish between the red/amber and green because its such a small light, so I just have to take an educated guess based on time whether the laptop is charged or not...

    I always hate the fact they use red and green... red and blue would be much better and easier to distinguish.
  11. damado thread starter macrumors 6502

    Aug 8, 2006
    I drained the battery completely and now it shows orange again when charging...not sure why, but orange seems more comforting to me since it's what I expect hehe.

    To my eyes, the orange and red are VERY distinguishable. No way to mix them up.

    I'll still ask about it when I go in to apple, but from my experience the "geniuses" probably won't know.
  12. Nipz macrumors 65816


    Nov 1, 2006
  13. mnemons macrumors newbie

    Oct 18, 2008
    I also see red light on the MagSafe plug while the battery is charging.
  14. ThreeFingers macrumors newbie

    Oct 21, 2011

    When I first purchased my MBA I noticed the same color behavior--albeit inconsistently. Green, Orange, and sometimes Red

    Here's the deal, there is no red light! There is only orange and green. However, the orange LED will *appear* red if you happen to be working near a natural light source or if your eyes were recently exposed to natural light.

    The reason has to do with how the human eye adjusts to natural light--rods and cones, ghost colors, etc.

    You'll notice that the "red" light returns to orange after your eyes have adjusted to indoor lighting.
  15. thundersteele macrumors 68030

    Oct 19, 2011
  16. h4lp m3 macrumors 6502

    Jun 29, 2011
    New Orleans
  17. Gav2k macrumors G3


    Jul 24, 2009
    There is two LEDs inside the MagSafe. Green and red. They both light up to make Amber but sometimes the green is a little dimmer making the red stronger. It's nothing to worry about.

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