Fault Phenomenon: Zoomlion ZR220 rotary drilling rig after starting, the instrument display screen has no display, but the machine can operate.

Troubleshooting Process:
– Checked power supply: display screen supply fuse blown.
– Checked harness: CAN bus connector loose.
– Checked ground: poor grounding.
– Checked module: display module internally damaged.

Root Cause: The display screen power supply line fuse is blown, preventing the screen from powering on.

Required Parts: Replace fuse of the appropriate rating.