I identified the console tracks (R852-Rx, R859-Tx) according to the picture here:
https://wiki.samygo.tv/index.php?title= ... -D8X00.jpg
I also connected Putty as descibed here:
https://wiki.samygo.tv/index.php?title= ... BD_players
using FTDI converter set to 3.3V.
Oscilloscope connected to R859-Tx shows 3.3V when device is powered and 0V when off. No signals appear on this pad.
Do I need any settings for the device to get boot info on the console?
Please note that the root cause is that this BD-D8900 does not output to HDMI. To investigate the reason I would like to get any output from the console.