No boot. Black screen. No chime.
== Is it my logic board? or my top case?== mine is the model with the 3.06GHz processor and a matte screen.
My computer was fine until April 2010, when I returned from 2 weeks in Haiti [volunteering, not a holiday] with HD errors [was left in backpack, in full sun for an hour one day]. I replaced HD with a Seagate Momentus Solid State Hybrid SATA Drive. Blew out some dust with compressed air since the case was open.
Optical drive stopped reading and writing in Nov 2011. So, I started copying over firewire to the dvd burner on my old powerbook. I often keep the Macbook pro running for a week or so before rebooting... but I run disk utility regularly, and repair permissions every month or so. Otherwise, everything was fine until it stopped dead last week. I went out for groceries, came back... dead. It was running when I left. It was cold. No boot, no chime. It was connected to an external display, so I knew it wasn't just the backlight. I read a lot here, at ifixit, to try and figure it out.
I followed the apple troubleshooting and disconnected all the peripherals and zapped the PRAM, reset the SMC, to no avail. If I held down the power I could get the fans to spin up and the tiny light at the front to go on, steady. But that's it. Since I have no applecare, I cracked it open and swapped RAM in and out to see if it has gone bad. While was in there, I blew out some dust. The heat sink [the long twisty one from the fans across the chips] had obviously been hot: it had slightly adhered to the black plastic that covers the keyboard. I feel like it has been running hot, but I cannot quantify that with numbers.
I checked the logic board for anything obvious and saw a small amount of corrosion on the board near the audio jacks and card slot. Mostly, the solder appeared dull compared to the rest of the board. I cleaned it with 99% alcohol on a little brush. I was checking it out with a loupe, and I could see dust on everything, so I gave the whole board a bit of a once-over with the alcohol/brush.
I put everything back together. No chime, no signs of life of any sort [except the battery gauge responds accurately]. The battery charges, the adapter goes from orange to green. I was pretty careful with discharging static before cleaning the logic board. There may have been a tiny splash of coffee a couple of days before this happened [-- it was on the speaker grille on the DVD side of the case, and there is no evidence of it inside the case, but I have not burrowed into the keyboard].
I disconnected the HD, optical drive, airport, bluetooth, battery gauge, one speaker, keyboard backlight, trackpad and keyboard. I kept the display connector connected [and the speaker and mic on the other side of the LB]. From the keyboard connector, I connected the fifth pin from the left to ground with the power adapter connected and the fans powered up. No other signs of life [as far as I could tell] -- no chime [but one speaker is disconnected], and there is nothing else connected to light up... but the display doesn't do anything.
I reconnected everything except the keyboard and optical drive. Powered up again with the contacts on the keyboard connector: the fans, front "sleep light" and HD power up. Still no display, or chime.
I connected my ipod to a usb port to see if it charges. It doesn't seem to. I am a bit freaked out, since I spend about 12 hours a day working on my computer [image processing, video editing, writing, browsing, my only phone is voip, and some large file transfers regularly].
It has been very dry here. I have accidentally zapped the trackpad numerous times with static electricity.
Is my logic board a goner? I have a multimeter but don't have any idea of what to check, or where... I am grateful for any suggestions, because i am at a bit of a loss here, and I don't know what to do next. If I borrow a usb keyboard should I try to safe boot... would that even work?? could it just be the top case? Please advise....
Это хороший вопрос?
Remove all the RAM, then try to power it on. Please let is know if it beeps or if the front light flashes in a pattern.
With both RAM out, fans and HD spin up and front light is on for 2 seconds [ish]. Then everything stops for a second and starts up again. No chime or beeps. The light stays on steady, except for the pause. The fans seem to be full-on: I think they may have been more subdued earlier in the testing. Everything but HD and speakers disconnected from the LB. [thanks for replying!]
из Katie diatho
If your MacBook Pro is not either beeping in a pattern or the front light is not flashing in a pattern when attempting to boot without Ram then it is failing POST at an early stage. This is not a good thing. Please give us the last 3 characters of your serial number, so we can determine your exact machine and attempt to give you the best/most economical repair options.
The last 3 characters are CSG. I appreciate the advice. I am in over my head at this point....
из Katie diatho
I suppose my options are [in no particular order]:
*a) sell for parts, in entirety or as bits [ram, lcd, battery, etc]
*b) logic board repair on ebay
*c) buy replacement logic board [through ifixit or apple or on ebay?]
*d) reflow solder?
*e) remove heat sink and reapply thermal paste?
Here are my questions:
*is there anything I can do to avoid spending $600 to $1200?
*I have access to an oscilloscope, is there something i can test?
*If my only recourse is a new logic board, would any a1286 board work?
and finally, Why? Why did this happen? Was it the static? should i reboot more often? was it the tiny splash of coffee [even though there is no evidence on the LB]? Should we just expect 26 months as a reasonable lifespan for apple products?
I will be grateful for any responses.
из Katie diatho
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