¶ Fault Symptom:
After turning on the printer power switch, the touchscreen does not light up.
¶ Fault Causes:
- A USB drive was inserted before turning on the printer power.
- The touchscreen connector is loose.
- The ribbon cable on the back of the touchscreen is loose.
- The mainboard power supply voltage is not set correctly.
- The mainboard or the mainboard power supply is damaged.
¶ Tools Required for Troubleshooting:
- 2.0 mm hex screwdriver
- Multimeter
¶ Troubleshooting Steps:
¶ 1. Remove the USB drive
Inserting a USB drive before powering on the printer may cause the mainboard to read abnormally, resulting in the touchscreen failing to light up. Please remove the USB drive and restart the printer power.
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¶ 2. Check if the touchscreen connector is loose
a. Turn off the printer power switch and unplug the power cord.
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b. Reinstall the touchscreen connector and ensure the threaded ring is fully tightened.
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¶ 3. Check if the ribbon cable on the back of the touchscreen is loose
a. Turn off the printer power switch and unplug the power cord.
b. Use the 2.0 mm hex screwdriver to remove the eight screws securing the back of the touchscreen.
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c. Check whether the ribbon cable and connector are loose, then reconnect them firmly.
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¶ 4. Check if the mainboard power supply voltage is set correctly
a. Turn off the power switch and unplug the power cord.
b. Check whether the mainboard power supply voltage is set correctly.
The mainboard power supply is located on the right side of the printer. Be sure to turn off the printer power switch and unplug the power cord before performing any operations.
Setting the wrong voltage may cause the printer touchscreen to fail to light up and may even damage the power supply.
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¶ 5. Check if the mainboard power supply has output voltage
a. Remove the screws at the marked positions in sequence.
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b. Unplug all connectors at the marked positions.
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c. Remove the mainboard cover.
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d. Use a multimeter to check whether the mainboard power supply has 24V output.
- If the mainboard power supply has no output voltage, the power supply needs to be replaced.
- If the mainboard power supply has 24V output voltage, either the mainboard or the touchscreen may be damaged. In this case, both parts need to be replaced together.
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¶ 6. Testing without a multimeter
Manually move the extruder quickly in the Y direction and check whether the touchscreen lights up.
- If the touchscreen lights up, replace the power supply.
- If the touchscreen still does not light up, replace both the mainboard and the touchscreen.
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