The Renautl Laguna 98 dashboard does not work

I need a hand, if anyone knows what the cause can be for the Renault Laguna 98 board to stop the speedometer, count turns, temperature clock, fuel and the gallega on board !!! thank you

When you have problems with a good Czech fuses board in the fuse and relax switchboards, the rely must enter if not, they are damaged or do not receive the ECU signal.

Most likely, I could be a loose earth, all lands

Well first of all, thank you for your answers !!! But I comment that little I understand all that but take it to a workshop where they only repair instrumental boards and they told me that I have to change the entire board !! According to them, it is because the microprocessor is damaged and it is easier and more economical to change it for a used, I have taken the board I have touched everything I had in sight but it remained the same, I have no idea where the mass cables or the relats corresponding to the entire board and the Galician, I still wait for your help !!!!! SOS !!!!