iBook G4 14 1.42 GHz charges battery, don´t turn on

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iBook G4 14" 1.42 GHz

Model A1134

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diego @diego25302

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Posted: Jul 2, 2011

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iBook G4 14 1.42 GHz charges battery, don´t turn on

Hi, I replaced DC-In Board reading Ibook G4 14 Troubleshooting (problem fit with "Bad DC-In Board" section.

Previously I bought a new power adapter and a new battery.

Battery ran, but power adapter didn´t charge it, so I bought a new DC-In Board and I replaced it following your instructions.

But now, battery seems to charge, I put it almost empty and now it has three green lights (although they appear and disappear, intermittent)

However, when I press the power button, computer does nothing, no turn on, no hard drive sound, it seems dead.

What would the problem? I don´t think board problem, cause it ran good before change DC-In Board. (It ran good with new battery 50% charged I mean, with new power adapter, computer did not turn on without battery)

Thanks.

Answered! View the answer I have this problem too

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lemerise @lemerise

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Posted: Jul 4, 2011

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Try to reset the PMU (power manager unit).

Disconnect the ibook from the AC adapter, remove the battery and push on the power button for at least 5 seconds then reinstall the battery, plug the ac adapter and try to power up the machine.

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4 Comments:

It almost works. I can start now, computer works with AC adapter (without battery too). But when I see About this Mac, More Info - Power, it appears Battery not charging. First time told me too there is 1 Cycle Count.

I turned off Ibook and I left power adapter trying to charge battery. Computer told me it has less than hour remaining before do this.

Now, battery is 43%, there are three green lights when i push battery button, and in Apple Menu appears 2 Cycle Counts.

It appears this too: "AC Adapter can´t charge battery : Yes"

Amperage shows 0

Voltage shows 14515

At least, I can use Ibook with AC, but it sounds something is still wrong.

Another ideas what can I do to fix it completely?

Thanks.

Jul 4, 2011 by diego

Is your battery a cheap generic one from China ? If so be aware that these batteries often have problems. Could you check it on another ibook ?

Jul 4, 2011 by lemerise

Yes, is this: http://cgi.ebay.es/ws/eBayISAPI.dll?View... I´ll try with old battery to make a proof. AC Adapter is from ebay too. At least I can use computer with AC Adapter.

Jul 5, 2011 by diego

With old battery Apple Menu say is charging. About Chinese battery don´t say it, but I´ve checked it charges too. Thanks, for your answer, problem solved.

Jul 5, 2011 by diego

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It almost works. I can start now, computer works with AC adapter (without battery too). But when I see About this Mac, More Info - Power, it appears Battery not charging. First time told me too there is 1 Cycle Count.

I turned off Ibook and I left power adapter trying to charge battery. Computer told me it has less than hour remaining before do this.

Now, battery is 43%, there are three green lights when i push battery button, and in Apple Menu appears 2 Cycle Counts.

It appears this too: "AC Adapter can´t charge battery : Yes"

Amperage shows 0

Voltage shows 14515

At least, I can use Ibook with AC, but it sounds something is still wrong.

Another ideas what can I do to fix it completely?

Thanks. — diego
Is your battery a cheap generic one from China ? If so be aware that these batteries often have problems. Could you check it on another ibook ? — lemerise
Yes, is this: http://cgi.ebay.es/ws/eBayISAPI.dll?View... I´ll try with old battery to make a proof. AC Adapter is from ebay too. At least I can use computer with AC Adapter. — diego
With old battery Apple Menu say is charging. About Chinese battery don´t say it, but I´ve checked it charges too. Thanks, for your answer, problem solved. — diego