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Vizio M421VT - User Manual

Vizio M421VT
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VIZIO M421VT User Manual
Version 9/16/2010 1
www.VIZIO.com
Dear VIZIO Customer,
Congratulations on your new VIZIO M421VT television purchase. To get the most out of your new VIZIO
HDTV, read these instructions before making any adjustments, and retain them for future reference. We
hope you will experience many years of enjoyment from your new VIZIO HDTV High Definition Television.
For assistance, call 877-MYVIZIO (877-698-4946) or e-mail us at www.VIZIO.com.
To purchase or inquire about accessories and installation services for your VIZIO HDTV, visit our website
at
www.VIZIO.com or call toll free at 888-849-4623.
We recommend you register your VIZIO HDTV either at our website
www.VIZIO.com or fill out and mail
your registration card. For peace of mind and to protect your investment beyond the standard warranty,
VIZIO offers on-site extended warranty service plans. These plans give additional coverage during the
standard warranty period. Visit our website or call us to purchase a plan.
Write down the serial number located on the back of your HDTV for easy reference when obtaining
warranty support:
Serial #: _____________________ Purchase Date _____________________
VIZIO is a registered trademark of VIZIO, Inc. dba V, Inc.
HDMI logo and “High Definition Multimedia Interface” are registered trademarks of HDMI Licensing LLC.
Manufactured under license from Dolby Laboratories.
Dolby and the double-D symbol are trademarks of Dolby Laboratories.
and are trademarks of SRS Labs, Inc.
TruSurround HD and TruVolume technologies are incorporated under license from SRS Labs, Inc.
This product qualifies for ENERGY STAR in the “factory default (Home Use)” setting and this is the setting in which
power savings will be achieved. Changing the factory default picture setting or enabling other features will increase
power consumption that could exceed the limits necessary to qualify for Energy Star rating.
THE TRADEMARKS SHOWN HEREIN ARE THE PROPERTY OF THEIR RESPECTIVE OWNERS; IMAGES USED
ARE FOR ILLUSTRATION PURPOSES ONLY. VIZIO, THE V LOGO, WHERE VISION MEETS VALUE AND OTHER VIZIO
TRADEMARKS ARE THE INTELLECTUAL PROPERTY OF VIZIO INC. PRODUCT SPECIFICATIONS ARE SUBJECT TO
CHANGE WITHOUT NOTICE. © 2010 VIZIO INC. ALL RIGHTS RESERVED.

Table of Contents

Questions and Answers

  • C
    Christopher SnyderAug 18, 2025
    How to fix 'No Signal' on my Vizio M421VT HDTV?
    • J
      jstewartAug 19, 2025
      If your VIZIO HDTV displays 'No Signal', first, press the INPUT button to ensure you've selected the correct input source for your device. Then, verify that the device you're trying to use is powered ON and check the connections of any external devices connected to your HDTV. Finally, inspect the video/device cable for any damage and try using a different cable (HDMI, Component, AV/Composite, Coax, etc.).
  • M
    Michael RodriguezAug 21, 2025
    What to do if my Vizio HDTV has power but no image?
    • K
      kimberly23Aug 21, 2025
      If your VIZIO HDTV's power is on but the screen is black, ensure the VIZIO logo glows white, indicating power. Check that all cables connected to your HDTV are correctly attached to the output of your external device and that the external device is powered on. You may also need to adjust the brightness, contrast, or backlight settings. Also, press the INPUT button to select the correct input source. If the issue persists, perform a power cycle by removing the AC power cable from the back of your television for 30 seconds, then reinsert it and power on the television.
  • L
    Leslie JohnsonAug 23, 2025
    Why won't my Vizio HDTV remote work?
    • M
      Michael LopezAug 23, 2025
      If your VIZIO HDTV remote control isn't working, make sure you are pointing it directly at the remote sensor on the TV (IR mode only) and that there are no obstructions between the remote and the sensor. Try replacing the batteries with new ones. If your remote has a keyboard, it needs to be Bluetooth paired to your VIA television to function correctly. Bluetooth pairing improves response and performance.
  • B
    Brett NelsonAug 26, 2025
    How to fix wrong colors on Vizio M421VT HDTV?
    • C
      connor73Aug 26, 2025
      If your VIZIO HDTV displays wrong or abnormal colors/patterns, start by checking the color and tint settings in the Picture Menu. You can also reset the Picture settings to default in the Picture Menu. Next, check the video settings and compatibility of any external devices. Also, check the video cables of external devices to ensure they are securely connected at both ends and try another device on the same input. If you are using an antenna, the signal strength of the channel may be low. Make sure your antenna is connected securely to the TV and move the antenna to an alternate location in the room or close to a window. If the issue persists, perform a power cycle by removing the AC power cable from the back of your television for 30 seconds, then reinsert it and power on the television.
  • J
    Justin AtkinsonAug 28, 2025
    What to do if Vizio HDTV says 'No RGB Signal'?
    • M
      Michael ColemanAug 28, 2025
      If your VIZIO HDTV shows 'No RGB Signal. Power will be turned off', and you're using the RGB Input to connect to a computer, ensure that a supported PC desktop resolution is selected first. If no computer is connected, press INPUT to select a different input source. Note that if no computer is connected and the input is not changed, the television will power off.
  • J
    John JohnsonAug 30, 2025
    Why is my Vizio M421VT HDTV not turning on?
    • M
      Mallory SmithAug 30, 2025
      If your VIZIO HDTV has no power (VIZIO logo is off), ensure your AC power cable is securely connected to the back of the television and the wall outlet. Try plugging another electrical device into the outlet to verify it's working correctly. You might also try another electrical outlet in your home, preferably on a different circuit. As a last resort, try another AC power cable; any standard 3-prong, grounded, UL-approved computer power cable can be used.
  • A
    Aaron RomeroSep 1, 2025
    Why is there no sound on my Vizio M421VT?
    • J
      Jacqueline PollardSep 1, 2025
      If there is no audio from your VIZIO HDTV, first, press Volume + (Up) on the remote control or the side of the TV. Also, press MUTE on the remote control to ensure that MUTE is not ON. Check the MTS Audio settings in the Tuner menu to make sure they are set to Stereo/English (TV input only). Verify that the TV Speakers are On in the Audio menu. Check the video/device cable integrity and try another cable (HDMI, Component, AV/Composite, Coax etc.). Change the audio settings of the external device. If you are using an antenna, the signal strength of the channel may be low. Make sure your antenna is connected securely to your HDTV and move the antenna to an alternate location in the room or close to a window.
  • J
    John TaylorSep 6, 2025
    Why does my Vizio M421VT have distorted image or sound?
    • T
      trujilloshaneSep 6, 2025
      If you are experiencing distorted images or unusual sound on your VIZIO HDTV, check the video/device cable integrity and try another cable (HDMI, Component, AV/Composite, Coax etc.). Try the external device on another input. In some cases, interference from electrical appliances, cars, motorcycles, or fluorescent lights may affect television performance. If possible, move your HDTV to an alternate location within your home. If the issue persists, perform a power cycle by removing the AC power cable from the back of your television for 30 seconds, then reinsert it and power on the television.
  • P
    Patrick ShortSep 12, 2025
    How to remove black bars on Vizio HDTV screen?
    • C
      Christina WhiteSep 12, 2025
      If the display image on your VIZIO HDTV doesn't cover the entire screen, resulting in black bars on the top or side of the image, go to the Wide menu in HDTV Settings to view the available aspect modes. Check the video settings of your external device. If you're using the RGB input (Computer), ensure a supported PC desktop resolution is used. Also, if using the RGB input (Computer), go to the Picture menu and select Auto Adjust to fit the PC desktop to your HDTV.
  • C
    Christopher MillerSep 13, 2025
    What to do if my Vizio M421VT has dead pixels?
    • M
      Michael WilsonSep 13, 2025
      If your VIZIO HDTV has pixels (dots) that are always dark or colored, check the video/device cable integrity and try another cable (HDMI, Component, AV/Composite, Coax etc.). Check other Inputs and external devices. Remove all external devices to see if the issue remains. Perform a power cycle by removing the AC power cable from the back of your television for 30 minutes to 1 hour, then reinsert the power cable and power on the television.

Vizio M421VT Specifications

General IconGeneral
BrandVizio
ModelM421VT
CategoryHDTV
LanguageEnglish

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