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I have a Raspberry Pi 3 but no HDMI cable but I do have a 2560 mega Arduino. I read a couple of places that Arduino has an onboard ttl chip.

on the Arduino I shorted reset to gnd (which should of put it into the proper mode) I connect tx1/rx0 on the arduino with pin 8 and 10 on the Pi https://pinout.xyz/# then ground to gnd and 5.5v to pin 4

when I set minicom to /dev/ttyAMC0 (the same device that appears in Arduino normal mode), minicom just locks up.

http://imgur.com/a/TGiwc

How do I connect to a Raspberry Pi via rs232 using Arduino as a serial to USB bridge on Linux?

UPDATE: Note: http://hardwarefun.com/tutorials/using-arduino-as-a-bridge-to-connect-serial-devices-with-pc

the Pi 3 appears to be DOA. I found HDMI and get a black screen upon power on.

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    What are you trying to accomplish that couldn't be done via SSH or VNC? You also run the risk of destroying your Pi since the GPIO pins are not 5 volt tolerant. – Steve Robillard Dec 16 '16 at 2:56
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To do so you need to enable serial console on RaspberryPi-hosted OS - it's not hardware-only feature. For bootscreen it's a line enable_uart=1 at the end of /boot/config.txt, for your OS distribution refer to it's docs

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