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Thread: Macbook 3.1 battery issue?

  1. #11
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    Quote Originally Posted by BradC View Post
    If you can see the image how can you possibly blame the graphics card? The graphics card drives the panel and renders the image. The backlight makes it visible.

    The image is visible so a logical deduction would be the backlight. Next step is find out if it's LED or CCFL. It's unusual for a led to behave like that, but not at all unusual for an aged CCFL or its inverter.
    Thanks Brad,

    How do I find out what sort of backlight it has?

    DL

  2. #12
    BradC is offline Super Moderator
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    Quote Originally Posted by 350RRC View Post
    Thanks Brad,

    How do I find out what sort of backlight it has?

    DL
    Grab the part number off the bottom of the machine. Usually Axxxx and go from there.
    Starting with a quick "Axxxx backlight failure" search will generally be pretty illuminating.

  3. #13
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    Quote Originally Posted by BradC View Post
    Grab the part number off the bottom of the machine. Usually Axxxx and go from there.
    Starting with a quick "Axxxx backlight failure" search will generally be pretty illuminating.
    It'll be good if it turns out to be really illuminating.

    cheers, DL

  4. #14
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    Ok, there's no number on the bottom, but it must be an A1181 because that's the only one that's 2.2 Ghz.

    Has a CCFL backlight.

    From what I've read it could be the CCFL, the inverter, or a dry joint on the logic board from overheating.

    Unlikely to be the inverter cable.

    DL

  5. #15
    BradC is offline Super Moderator
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    If you wind the brightness down to the lowest (dimmest) setting, does it last longer after a cold start?

    If you wind the brightness down to "off" for a couple of minutes, does it start back up when you increase the brightness again?

    If it's a dry joint on the main board due to overheating, the overheating should be pretty obvious under magnification.

  6. #16
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    Quote Originally Posted by BradC View Post
    If you wind the brightness down to the lowest (dimmest) setting, does it last longer after a cold start?

    If you wind the brightness down to "off" for a couple of minutes, does it start back up when you increase the brightness again?

    If it's a dry joint on the main board due to overheating, the overheating should be pretty obvious under magnification.
    Yep it's been on for 40 minutes now on the dimmest visible setting.

    If I go to black it will light up going brighter.

    Starting to think it's full of dust and the fan isn't working causing a temperature shutdown maybe.

    Seen enough vids on how to split the case and have the tools to clean it inside.

    Took the (original) battery out to get a bit of an idea of the amount of filth inside, battery appears to be slightly swollen. Still reads ok as in my first post.

    Your thoughts are appreciated, and JT's.

    cheers, DL

  7. #17
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    Quote Originally Posted by BradC View Post
    If you can see the image how can you possibly blame the graphics card? The graphics card drives the panel and renders the image. The backlight makes it visible.

    The image is visible so a logical deduction would be the backlight. Next step is find out if it's LED or CCFL. It's unusual for a led to behave like that, but not at all unusual for an aged CCFL or its inverter.
    OK, now we have an expert onboard, has the OPs problem been fixed??
    ​JayTee

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  8. #18
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    Screen still hasn't gone to black on the lowest (still visible) dim setting.

    DL

  9. #19
    BradC is offline Super Moderator
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    Quote Originally Posted by 350RRC View Post
    Screen still hasn't gone to black on the lowest (still visible) dim setting.

    DL
    Ok, so next step would be to pop it open and have a look around. I'd be having a look at the inverter and associated cables/connectors for signs of overheating. I'd also fire it up and keep the inverter cool with freezer spray to see if it was sensitive to thermals. Be careful if you are poking around the inverter, they are good for a couple of hundred volts.

  10. #20
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    Quote Originally Posted by BradC View Post
    Ok, so next step would be to pop it open and have a look around. I'd be having a look at the inverter and associated cables/connectors for signs of overheating. I'd also fire it up and keep the inverter cool with freezer spray to see if it was sensitive to thermals. Be careful if you are poking around the inverter, they are good for a couple of hundred volts.
    Ta,

    Apparently the inverter is good for voltage in the kV range.

    Screen is still on, just trying to warm the whole thing up watching a Zappa tribute vid.

    Have the volume cranked, no fan running. Not normal.

    I can live with it like this (dimmish) but I get sucked into fixing things.

    Will look at diagnostics now the screen isn't having a nap after 10 secs or less.

    cheers, DL

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