13" aluminum unibody, 2.0 or 2.4 GHz Core 2 Duo processor.

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Why is my MacBook not charging when it has current flow?

I recently acquired a 2008 Macbook Aluminum version. The mac says that it will not charge. The strange thing is that the mac does actually charge but very slowly.

Here are some details that have made me think it is still possible to fix:

  • The 85 Watt T-Shape Magsafe connection has a faint green light
  • The laptop claims to not be charging, but has a positive amperage ranging from 90~140 mA
  • The battery percentage does not lower, but retains charge when plugged in during normal use
  • The battery will in fact charge in small amounts when left to idle

What I have tried in order to fix it:

  • Cleaned the magsafe pins on both the computer and charger
  • Reset SMC and PRAM
  • Various methods of reseting, and restarting
  • I tried removing both sides of the adapter and plugging it back in
  • I used two additional L-Tip adapters (60W). One of them work, but then I unplugged it thinking I had fixed the issue. Upon plugging it back in the mac would not charge again.

Other Notes:

  • The macbook was apparently used as a HTPC, so may have been left in to charge for long periods of time.
  • I disassembled the device to see if there was any visible water damage and the machine looks pristine
  • Various softwares tell me there is current flow and about ~1.3 watts getting through the connection.
  • Battery appears to be official branded and only ~2 years old.

I would like to get this resolved and have ordered a new Mag Safe DC board to see if that works. Has any one else run into any similar issues, or have any ideas?

Out of curiousity does anyone know what component signals to the computer if the AC adapter is plugged in? (Logic board or Magsafe)

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Battery Information:

Model Information:

Serial Number: W020702JS6GOA

Manufacturer: SMP

Device Name: bq20z951

Pack Lot Code: 0

PCB Lot Code: 0

Firmware Version: 002a

Hardware Revision: 000a

Cell Revision: 100

Charge Information:

Charge Remaining (mAh): 1726

Fully Charged: No

Charging: No

Full Charge Capacity (mAh): 3985

Health Information:

Cycle Count: 58

Condition: Normal

Battery Installed: Yes

Amperage (mA): 119

Voltage (mV): 11368

System Power Settings:

AC Power:

System Sleep Timer (Minutes): 10

Disk Sleep Timer (Minutes): 10

Display Sleep Timer (Minutes): 10

Automatic Restart on Power Loss: No

Wake on AC Change: No

Wake on Clamshell Open: Yes

Wake on LAN: Yes

Display Sleep Uses Dim: Yes

PrioritizeNetworkReachabilityOverSleep: 0

Battery Power:

System Sleep Timer (Minutes): 10

Disk Sleep Timer (Minutes): 10

Display Sleep Timer (Minutes): 2

Wake on AC Change: No

Wake on Clamshell Open: Yes

Current Power Source: Yes

Display Sleep Uses Dim: Yes

Reduce Brightness: Yes

Hardware Configuration:

UPS Installed: No

AC Charger Information:

Connected: No

Charging: No

Answered! View the answer I have this problem too

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Is this with the charger plugged it? If so, have you checked your AC charger? Also, check the power/ continuity for the PBUS SUPPLY / BATTERY CHARGER circuitry F7000

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Chosen Solution

This little tidbit tells me you have one or more bad FET's and the comparator logic could also be damaged.

AC Charger Information:

  • Connected: No
  • Charging: No

You can see on Images below the FET's just behind the LDVS cable connector on the main logic board and the DC-In board Five pin FET SMT device (4+1) there are ten in this model the others are on the back side Logic bd - Back side & Logic bd - Top side

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I am asuming these are the chips labeled C397? Would these parts be viable to replace, or should it be sent in? Would it be detrimental to the computer to leave them as is and continue usage?

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No: The 1127 8H1 5023 device in the first image. You should test them before replacing. You may find it best to let someone with more skills handle this or just replace the logic board.

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How would I go about testing them?

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