Overview
Follow these steps if your machine is showing a white screen with a navigation bar at the bottom and any of the following errors:
No Finding Serial Port
No Network Connection
No Server Connection
Abnormal Server Connection
Applies to all VTM machines. Serial port cable position may vary by machine model.
Slim Wall / Mega Wall 2.0: Please open the door and remove the panel behind it — you will be able to see all the hardware parts inside.
Slim Tower: Please open the door and look at the bottom right corner — you should see the board inside a case.
Phase 1 — Power Off & Check IO Board Cable
Step 1: Turn off the machine
Power off the machine and unplug the power cord from the outlet completely before touching any internal cables.
⚠️ Important: Always unplug the machine before touching any internal cables.
Step 2: Locate the IO Board (Green Board)
Open the machine and find the green IO Board inside. Look for a white cable located next to the SIM slot on the board.
Step 3: Check and reseat the white cable
If the cable is not connected — plug it in firmly until you hear a click sound.
If the cable is already connected — unplug it, then plug it back in firmly until you hear a click sound.
Phase 2 — Power On & Verify Cable Fix
Step 4: Turn the machine back on
Plug the power cord back into the outlet and power on the machine. Wait for it to fully boot.
Step 5: Check the screen for updated error
✅ Good sign — Screen shows only "No Network Connection" or "No Internet" and the "Finding Serial Port" error is no longer showing. The cable fix worked.
❌ Still showing Serial Port error — Recheck the cable connection on the IO Board and try again.
Phase 3 — Connect to Internet
Step 6: Access Machine Settings
On the navigation bar at the bottom of the screen, tap the Circle button. This takes you to the Machine Settings screen which shows: Applications, Settings, File Manager, and Browser.
Step 7: Connect to Wi-Fi or Ethernet
Go to Settings and connect the machine to your Wi-Fi or Ethernet network. Once connected, open the Browser and try loading a webpage to confirm the machine has internet access.
Phase 4 — Clear App Cache & Relaunch
Step 8: Clear VTM App storage and cache
Go to Apps & Notifications → VTM App → Storage & Cache and tap Clear Storage and Clear Cache.
Step 9: Force Stop and reopen the VTM App
Tap Force Stop on the same screen, then reopen the VTM App.
Step 10: Confirm the machine is online
The VTM App should now be running normally. Verify the machine is showing as Online in the VTM App or the VTM software web portal.
✅ Done! If the machine is showing online, the issue is resolved. If not, please contact VTM Support for further assistance.
If you continue to experience issues after following all steps, please contact VTM Support for additional assistance.