Chosen Solution
I have a MacBook Pro 15” Mid 2010 (A1286) i7 2.66 GHz, Logic Board 820-2850-A. I recently replaced the battery (non-Apple authorized), and added RAM memory from 4 to 6GB. It all worked fine for about 24 hours and I shut down normally, and did not try to boot the machine until about 4 days later. Now, when I press the power button, no display, and no startup chime. I hear the hard drive spin for about 2-3 seconds, then click off (like it sounds when you shut down normally by holding the power button). I have done a lot of Internet research, and have tried the following: Put the RAM back to the original config. (2 x 2GB original SoDIMMS) tried as many different RAM combination configs as I couldCarefully reseated the RAM sticksRemoved the new battery, charger still green.Tried again with the OLD, dead Apple batteryTried a different, newer, 85 watt MagSafe Power Adapter Both my Power Adapters still act normally: Green light when powered, and Yellow light when charging the new battery) Tried both SMC and NVRAM resets (since it seems to be a power issue, these resets did not start or complete) Watched all of Louis Rossman’s videos about problems common to this logic board (ha!) I ordered the capacitor he recommended to replace and rework (circled in Yellow in the photo). I’m not an advanced Micro-solderer, but thought it might be worth a try (I have not received the parts yet). While waiting for these parts to arrive, I spotted what I believe to be a very badly burned out yellow or brown fuse less than an inch “West of” the GPU (fans and heat sink being North and RAM slots being South ) I hope you can see the photos I posted. The “fuse” or part in question is circled in RED.
If you know the name of that fuse, and how I can buy a replacement to rework it, I would be MOST grateful! It is very possible I will end up sending this old PB15 to Mac heaven! If you’ve read this far, thanks! I have decided I will really be happy if I can repair it without spending over $100 (or 200 or 300) for a replacement board.
Here’s a better view of the part:
The Polymer-Tantalum capacitor markings are: 868-16K-001 in a D2E case. Here’s one source Mouser.Com
