LCD display shows garbage characters sometimes

[vad7]

Printer Acrylic Prusia I3 with Sanguinololu.
This does not happen on a regular basis.
When I reconnect the LCD board it show correct characters (except special symbols).
Once the control board hung.

LCD garbage

IMG_1497.JPG (34.72 KiB) Viewed 8911 times

[zhangxueyou]

Please make sure the wires are well connected. Turn off the printer, and turn it on again.

[vad7]

I have checked cables many times.
After restart the printer works fine for a some time.

But what can I do while printing? If I restart print I lose printed model.

May be is it the firmware or COM port setupt issue? I set COM port to 250000.
How to check the firmware version I dont know.

[vad7]

I have checked the firmware version: 1.0.0, compiled: Feb 2, 2015 15:17:04.

[zhangxueyou]

How about printing without computer? I mean print offline with SD card.

[vad7]

Garbage characters do not appear a few days.

A new problem have appeared.
The computer often lost connection with the printer.
Often during the beginning of the second printing.
I reconnect USB and print successfully.

[vad7]

I have replaced USB cable. Now works fine.