Portable Monitor Troubleshooting

Modified on Sat, 31 Jan at 8:01 PM

Overview

This article provides troubleshooting steps for common issues experienced with ViewSonic portable monitors. Use this guide to identify symptoms, understand possible causes, and follow recommended solutions.

Applies To

TD1655, TD1656‑2K

VA1655 VG1655, VG1656N, VG1656‑2K, VX1654, VX1655, VX1655‑4K, VX1655‑4K‑OLED, VX1754, VX1755, VP16‑OLED, VP1656

1. Issue: No Signal

Symptoms

Monitor displays “No Signal”
Screen remains black even when connected
Input source message repeatedly appears

Possible Causes

Incorrect or loose cable connection
USB‑C port does not support video output
Wrong input source selected
Incompatible or low‑quality cables
Device does not support USB‑C video output

Solutions

Ensure all cables are securely connected.
Confirm the USB‑C port supports DisplayPort Alt Mode (video output).
Switch the monitor’s input source (USB‑C / HDMI).
Use certified USB‑C (USB 3.1 or higher) or HDMI cables.
Verify that your device supports video output over USB‑C.
Restart both the monitor and the connected device.

2. Issue: No Power

Symptoms

Monitor does not turn on
No LED indicator
No response when pressing the power button

Possible Causes

Insufficient power supply
Damaged or loose power cable
USB‑C port does not provide enough wattage

Solutions

Test the power outlet or USB‑C power adapter.
Inspect the power cable for damage and ensure secure connections.
Press the physical power button (if required by the model).
If powering via USB‑C, confirm the port provides adequate power.
Use an external power source if the device cannot supply enough power.

3. Issue: “Out of Range” Message

Symptoms

Monitor displays “Out of Range”
Screen flickers or goes black when changing resolution
Display works on other devices but not the current one

Possible Causes

Unsupported resolution or refresh rate
Outdated graphics drivers

Solutions

Adjust the device to a supported resolution for your monitor model.
Set the refresh rate to a supported value (commonly 60 Hz).
Update graphics drivers on the connected device.
Restart both devices to renegotiate display settings.

4. Issue: No Touch Response

(Touch‑enabled models only: TD1655, TD1656‑2K, etc.)

Symptoms

Touch does not register
Touch is inaccurate or inconsistent
Touch works on the device but not on the portable monitor

Possible Causes

Model does not support touch
Incorrect cable type
Missing macOS driver
Unsupported device (e.g., iPhone/iPad)

Solutions

Confirm the monitor model supports touch functionality.
Use a USB‑C to USB‑A data cable for touch input (HDMI does not carry touch).
macOS users must install the vTouch driver and follow the setup guide.
Note: Touch is not supported on iPhones or iPads.

Troubleshooting Video:

Helpful Links:

ViewSonic Portable Monitors

For additional questions, please contact ViewSonic's Support by submitting a support ticket HERE or by Phone: US: 800-688-6688, CAN: 866-463-4775. ViewSonic’s call center hours: M-F, 6 AM - 6 PM PST.