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water(coffee) damage on logic board (820-2850 A)

I try to repair a A1286 MBP, mid 2010 15" (820-2850 A Motherboard).

My Electronics-knowledge is ok, but i could need some Macbook- expert-advice.

The Notebook has water damage, and before maybe ordering spare parts, i want to find out as much as i can about the damage.

Initially it was plain dead, even after thorough isoprop.Alcohol cleaning.


After a year laying around, now it's a bit better:

  • pwr button not working, i turn it on via pads on Motherboard, not booting. (have replaced a mbp keyboard before, easy, but lots of screws...)
  • Battery is charging.
  • Screen black. (LVDS Connector has the leftmost 2 pins corroded, sure needs replacement.)
  • via hdmi cable, no ext. screen. (turn on, close display)
  • Without ram, i get 1 blink every 5 sec (no beeps), seems normal no-ram error, according to blink definitions.
  • With ext. keyboard, i can eject a cd upon boot by pressing F12.

Powering on with all connectors (excl. keyboard):

  • pwr led on, fans spin up
  • hdd spinup
  • some hdd access sound
  • dvd init sound
  • pwr led off
  • some hdd access sound

Resources found so far:

Service Manual: (site has many more)


Power on Self-Test Beep/Blink definitions:


  • Is there a way to power off / Reset by shorting some Pins on the Board? [edit] Ah, off course: shorting the contacts which turn on the mac, for longer than ca. 10sec. will turn it off (hard reset).[/edit]
  • Would i normally get something on an external screen before booting? (if yes, also via hdmi, or maybe only vga?)
  • To better work with the schematics, are there any board layout infos around? (fuses, lvds pin ordering, test point locations...)
  • any of my symptoms sound familiar?
  • general tips on how to proceed?

Thanks to the manual- and schematics- posters... and hopefully some responders ;-)

Answered! View the answer I have this problem too

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Your symptoms are common for corrosion water damage. That you get no external video points to VGU/VGC logic board issues.

Only you know how much you want to spend to fix this. Due to VGU damage IMHO the most practical solution would be to replace the entire logic board (an advanced DIY project).

If this Answer is helpful please remember to return and mark it Accepted.

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sirtet will be eternally grateful.
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