JCB 426ZX EMS Display 728/80114 Not Working—Looking for Schematics or Repair Guide

Hello!
My name is Oleksandr. I'm from Ukraine.
I have a problem: my wheel loader JCB 426ZX is broken, it EMS (electronic monitoring system) display not working (it part number - 728/80114).
I applied to dealer JCB with request for repair the display, but had received a negative responce. Dealer had offered me to buy a new display for 3000$. It's too expensive for me.
Please, help me with repair the display of my JCB. I'm electronic engineer and trying to repair the display but I have nothing electronics circuits or anything documentation.
Thank you.

Hi, Oleksandr Melnik,

If your display is broken it is very difficult to repair ,get it replaced some displays gets dark color on the screens when broken.

Thank you for your reply, but it's not simply display it's bort computer of wheel loader.
Photo in attachment.

OLEKSANDR MELNIK,

from the photo it look like as if the display is ok , may be some display connector problem or any other wire connector problems.in side the unit. get a good lcd tv mechanic he may be able to help you.

Problem not with lcd-unit, problem with MCU or EEPROM or RAM.
But what kind of problem, I can not localized...

If the problem is not in the LCD, it may probably be with the internal circuitry. Are there no technician available to check it out? I might agree with sambath, it might be just connections. Can it be powered? It might be possible of a burnt mcu I guess.