Water Damage, Logic Board appears fine...no Boot?
June 2014 Manufacture date
A1278
S/N can be seen in the picture.
Cause:
Daughter spilled Vinegar+water solution on keyboard. She may or may not have properly powered it off immediately.
Symptoms:
-Power button causes no response, no boot
-Attaching the charger cable gives me the 'AHHH' and the fan and HDD spool up; no screen ----Originally the HDD would not spool up, and I replaced it with a new one (sans OS). So the original HDD is confirmed bad. But still have the same root issue with a new one.
Done so far:
-Disassemble and clean logic board with isopropal+toothbrush under a nice microscope.
-Inspected each component for signs of shorting & found none; There was some light corrosion, but not significant (I think based on low experience). In viewing the picture of the logic board, I saw a bit more corrosion at the battery connector that I have since cleaned up. Did not include a pic of the back side of the board because it looks pristine.
-Tried the RAM switch/re-try with 1 chip at a time.
Next Steps
I have good technical capability, but know very little about Macs. I'd appreciate it if anyone could advise the proper next steps to debugging this. My plan for tomorrow otherwise:
-Have not removed the keyboard yet, but it looks like power button is a part of that component. Also looks like 100 screws holding the keyboard lead frame must be removed to replace it...don't see any visual indications of problems.
-Soak logic board in water to ensure cleanliness
Thanks,
John
Is this a good question?
2 Comments
john, with your serial number your computer comes back as a 2.5 GHz Core i5 (I5-3210M)
Intro Date: June 11, 2012 Disc Date: None
Order No: MD101LL/A Model No: A1278 (EMC 2554*)
Subfamily: Mid-2012 13" Model ID: MacBookPro9,2
Std RAM: 4 GB Std VRAM: 512 MB*
This will make a difference if you are having logic board issues. Looks like your board is a 2.5 GHz Core i5 (I5-3210M)
Intro Date: June 11, 2012 Disc Date: None
Order No: MD101LL/A Model No: A1278 (EMC 2554*)
Subfamily: Mid-2012 13" Model ID: MacBookPro9,2
Std RAM: 4 GB Std VRAM: 512 MB*
Std Storage: 500 GB (5400 RPM) Looks like your board is a 820-3115-B
by oldturkey03
Thanks oldturkey; logic board number confirmed to 820-3115-B. I should have checked the S/N. (But interestingly, we did order the 'Core i7 2.9GHz version, but apparently received the 2.5Ghz Core i5)
by John