I realized the LN4890 was an opamp soon as I got the higher resolution photos and saw it was across the output...including a solder splash that apparently wasn't doingt anything cuz the volume of the speaker didn't get any louder...i can actually turn my headphones up and get more volume than the internal speaker.
the 5800 I wasn't sure if it was the DAC or FM. The JST196T crosses to a FM7843 which is a touch-screen controller...although I saw something that reffered to it as something suitable for "medical implants" and didn't mention anything about it being a touchscreen controller...that could of been a badly translated page too...but I've seen several posts that cross it to an FM7843. Good enough for me.
So...this leaves one question...where-tf is the DAC? Is it possibly on the otherside of the board squeezed under the LCD? They didn't build a DAC into the RK2706 core did they?
*edit: hey...i found this page:
http://s.pudn.com/upload_log_en.asp?e=1187327 that has this to say: "1. 5800C-DEMO.rar,170KB,downloads 0 ,5800 chips to do with FM radio, 5800C-DEMO board software." So apparently you were right, that 5800 is the FM tuner.*