Schematic needed for Neovo X-17A monitor

[E Parton]

Hi friends ..
I have 2 of these in for repair with exactly the same fault on each ..

Loading the 12v psu brick when connected ..

Inductor L802 gets mighty hot
FET 8 pin smd Q801(RSS050) gets too hot to touch as does Zener diode ZD801 (suspect its possibly 6.2v),,
The fet is dead I suspect ...as is the zener ...definately short circuit..
These components have been replaced with what I think are close matches ...
but the zener and the fet failed again ..immediately ..
So I suspect there is more to it ..
Problem is I have no sevice info ..as usual ..
I've even contacted what I believe to be the Neovo agent ..and they say there is'nt and never has been a schematic available ..
These guys _do_service these montors ..but only at board swap level ...which is a joke..
Anyone come accross these monitors ..
Any service info or hints would be most appreciated ..as the cost of pcb replacement makes the repairs non viable..
rgds
Evan