I got in a Lenovo Z50-70. It has no video either via HDMI or the laptop display. It comes on with a power light and keyboard backlight. The fan spins only a second at power on and then runs continuously later. I'm not seeing any evidence of liquid damage on the board. I've found a schematic for the board, and it is silk screened. What sort of thing do I want to look for in the schematic relating to no video? I figure there must be some overlap with the Macbook because it's also a Haswell system. Thanks.
https://www.flickr.com/photos/135232461@N04/27118833884/in/datetaken-public/
https://www.flickr.com/photos/135232461@N04/27118844954/in/datetaken-public/
http://www.s-manuals.com/pdf/motherboard/compal/compal_nm-a272_r1.0_schematics.pdf
https://www.flickr.com/photos/135232461@N04/27118833884/in/datetaken-public/
https://www.flickr.com/photos/135232461@N04/27118844954/in/datetaken-public/
http://www.s-manuals.com/pdf/motherboard/compal/compal_nm-a272_r1.0_schematics.pdf