SONY KDL40EX503 - firmware / sourcing compatible main board

[Beynon]

Thanks to budm, dick_barton and ReeceyBurger123 in helping previously with mainboard diagnosis on this.

Finding a compatible replacement main board with all the matching numbers is proving very difficult.

Might it be a case of finding one close to it then updating firmware (which I've found on the sony eu site)?

Here're the board and panel details:
Main board: 1-881-636-23
Sticker on main board: Y2008850J ; 158661; REV 106; SOFT 4085
Panel: LTU400HF02

Any assistance hugely appreciated.

[Beynon]

Re: SONY KDL40EX503 - firmware / sourcing compatible main board

Does anyone have any thoughts on this?

Could I use a main board that's close and update to the right firmware?
eg.
1-881-636-22 with matching model # and screen

Or perhaps use a matching board with matching screen but one model up eg KDL-40EX710

Would really appreciate any insights into sony board compatibility.

Thanks in advance.