I picked up an old METRIX OX 720 oscilloscope. I replaced 2 capacitors that went up in smoke.

Once restarted, here is the signal I get. 

[![enter image description here](https://i.stack.imgur.com/enoWp.jpg)](https://i.stack.imgur.com/enoWp.jpg)

The vertical part of the signal is missing. It is the same for both channels. 

Do you have an idea of the origin of the problem? 

Is the quality of the probe responsible for the poor quality of the display? Or is it the oscilloscope that has a display problem, in which case is it good for the case?

Probe model :

[![enter image description here](https://i.stack.imgur.com/4khmU.jpg)](https://i.stack.imgur.com/4khmU.jpg)

**EDIT : ADDIONAL IMAGES**

I have modified the sweep rate time and fully increase the brightness but nothing changed.

[![enter image description here](https://i.stack.imgur.com/RibRd.jpg)](https://i.stack.imgur.com/RibRd.jpg)

[![enter image description here](https://i.stack.imgur.com/phjU8.jpg)](https://i.stack.imgur.com/phjU8.jpg)