Serial/Console Interface for Video Brochure?
I recently acquired one of those cheap video brochures (the kind that loops a video on full volume until you want to dash it against a wall)... Anyways, I couldn't resist the urge to hack with it, so I pulled the enclosure apart to expose the electronics. Inside I found a magnetic switch, a USB mini connector with all pins wired (two power/two data), a motherboard with three ICs and a scattering of other components, and a rechargeable battery (seems to be LiPo) all wired up to a 5.5" display. I plugged the usb to my computer and it mounted as a drive labeled "MediaPlayer". Inside was the original video file that I replaced with one of my own videos in the same format. It now plays my video with sound. Where I am stumped is with the circuit board. I have not found any markings on the board itself, however it has some pins around the edge to which the switch and speaker were connected to (I'm guessing these may be GPIOs.....). There is also an unpopulated four pin header (to the right of the display connector) that looks like it may possibly be for another USB port. There are also four solderable connections (on the bottom of the left side of the board) that are labeled GND, HRP, HRL, and DET... I wasn't able to find any meaning for those, but is it possible to establish communication through that? Last but not least, the three ICs on the board seem to be a CPU, and two flash chips.
The markings on the center one (which I'm assuming is the CPU) are:
The second IC, to the right of the "CPU" is marked:
KOR N7EAX553Q2 - also engraved with the letters JHY
The final IC, left of the "CPU" is marked:
According to Google, the E200 refers to the all winner E200 SoC that supports UART, SPI and TWI... It also says that it runs OS Melis 2.0...
I would like to hack into this system if possible and/or find a way to interface the LCD through SPI for my Pi Zero... Any help is greatly appreciated! Thanks! I included a couple of High Res photos to show the PCB (the display ribbon cable has been removed to show the third IC).