Bernina 640 screen goes black

this may be the problem with the backlight for your machine, you can contact [email protected]

google that.

There is usually a way of dimming the LED screen, but if that doesn't work, it's possible a computer component is dying.

A computer component is beginning to fail.

...

Hears the first video that came up on a youtube search: https://youtu.be/hJCRfpO_MVo

You should probably take it to Bernina for repair. Sounds like possibly a board or component.

...

System goes to loop.
Update to firmware BERNINA 780 Firmware V34 05 30 .

Are none of the lights on .... for example, is the sewing light on or the display backlight, even if there's nothing displayed on the screen. If it's completely dead, there may be a problem with the power supply 'L'-print module, but before you go poking-around, please make sure that the machine is dry and has not got damp in storage. Open the bobbin door and check that there's no sign of brown stains around the rotary hook (shuttle). Does the mechanism move OK when you turn the handwheel ? It's important to know whether damp has got into the machine because if-so it's essential to have the machine properly dismantled and dried BEFORE applying power for a long time, since this can destroy the main processor board, which is very expensive to replace.

For a 640: Make sure the machine is off then Press the reverse button and the needle up/down button at the same time and keep pressing while turning on the machine until the service screen come up. Select the "i" icon and then the icon that has a picture with the clock and a question mark. That will show you the hours and stitch count used. To exit the service program just turn off the machine.

For a 640: Make sure the machine is off then Press the reverse button and the needle up/down button at the same time and keep pressing while turning on the machine until the service screen come up. Select the "i" icon and then the icon that has a picture with the clock and a question mark. That will show you the hours and stitch count used. To exit the service program just turn off the machine.
.g_thread_answer { overflow:visible !important; }