Polar em won’t turn on

Hi everyone pls help
I have a problem with polar 76 em ,first when i switch the key on the motor turn normally then i press the green button everything it light up all the boards in the machine are successfully operated (when i switch any button i see led light up)
I measured in the keyboard 9v and 5v but the keyboard no longer displayed !!

 

Hi sir:

Please make this measure:
1)Key-board and
display BT: + 9 Volt D.C.
Tolerance: 8,4 - 9,6 Volt D.C.

2)
Key board BR: + 5 Volt D.C.
Tolerance: 5,08 - 5,12 Volt DC.


If the tolerance is out of Order you must repair the +9vdc or +5vdc.

If the tolerance is o.k the Display board, is faulty, Replace or repair.

 

Yes sir after measurement i get 8,94 in 9v
And 5,03 in 5v
So what should I repair

 

The dry+ colder joint Solder.

Blessing.

 

Thank you sir
I tried this but still not working !

 

Replace Display please.

Blessing