tevion lcd42031d service menu

[jimbofz]

Hi everybody ,im trying to acess s mode , to correct LVDS setting
 as i have solarisation with perfect on screen menus ,
this makes me think its not likely to be t con board .
i believe its same as some medion and techwood models
im sure ive seen this chassis before? but im getting old and
after more than 40 years of tv bashing i cant remember.
ive trawled the net and tried many codes but cant get in to s mode.
all supplies are good and caps in psu changed ,also on main board all caps tested
for low esr any other ideas for this fault please?