Macbook pro A1502 EMC 2835 comes on but no picture
Apple MacBook Pro Retina 13' A1502 J44 MLB-4G 051-0052 820-3536 (08-20-2013) schematic.pdf
The model MacBook Pro "Core i5" 2.9 13" Early 2015 (Retina Display) is powered by a 14 nm roadwell 2.8GHz Intel "Core i5" processor (5287U) uses a dual core processor along with a 3MB level 3 cache, 8GB of (non-upgradable) onboard DDR3-1866 (PC3-14900) SDRAM, 512GB Solid State "SSD" drive, a (shared memory) Intel Iris 6100 graphics processor.
This 3.48 lb (1.58 kg) model is housed in an extra lean aluminum case, featuring a 227 ppi 2560x1600 13" "retina" high-res LED widescreen display. It also has a backlit keyboard, a "Force Touch" trackpad along with a claimed 10-12 hour battery. Similar to the Air models, Apple has phased out any internal optical drive.
Most sadly, these "Retina" models are virtually sealed and not upgradeable in any way.Ports and connectivity come via 3-stream AirPort Extreme (802.11ac), Bluetooth 4.0, 2 USB 3.0 ports, 2 Thunderbolt ports, 1 HDMI port, 1 audio in/out port plus 1 SDXC card slot.