ELEKTRONIKA MK 61 display and keys dont work (Pictures)

[lechuck]

Hello, my English is not very good, I hope you understand me.

A few months ago I bought a calculator Elektronika MK 61, after a few weeks began to fail the 2nd digit but soon he returned to run the digit, but increasingly took longer, but one day that stopped working and with it the following keys: "П→X", number "6" and "/-/"
The only way I can get all the digit is by simultaneously pressing key "6" and then another key, then i can see all the digits on the calculator.

Here some pictures: