My VIZIO TV model V555-H1 that has horizontal and vertical lines on the screen. Now its stuck in service mode color test? How can I get it out of this color changing mode?

Horizontal lines at the bottom of a television screen can indicate several potential issues. Here are a few possibilities to consider in relation to your Vizio V585-H1 model:
1. Signal Interference: If you have a cable or satellite TV service, the lines may be caused by signal interference. Try checking the connections between your cable/satellite box and the TV, ensuring they are secure and properly connected. If you have an antenna, adjusting its position or adding a signal amplifier may help improve the signal quality.
2. Display Settings: It's worth checking your TV's display settings to ensure they are properly configured. Navigate through the TV's menu and adjust settings such as picture mode, aspect ratio, and sharpness. Experimenting with these settings may help resolve the issue.
3. Source Device Issue: The lines could be related to the device connected to your TV. Try using a different HDMI cable or connecting a different device (such as a DVD player or game console) to see if the lines persist. This will help determine if the problem lies with the TV or the specific source device.
4. Firmware Update: Check if there is a firmware update available for your Vizio TV model. Outdated firmware can sometimes cause display issues. Visit Vizio's support website and search for your specific model to find any available firmware updates and instructions on how to install them.
5. Hardware Defect: If the above steps do not resolve the issue, it's possible that there may be a hardware defect with the TV itself. In this case, it would be best to contact Vizio's customer support or seek assistance from a qualified technician who can diagnose and repair the problem.
Remember to consult the TV's user manual for specific troubleshooting steps and contact Vizio support for further assistance if needed.

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The picture shouldbe free of vertical or horizontal lines.

1. If the lines are present on the TV screen, press the SMARTbutton. on the remote control and select Settings> SUPPORT > Picture Test.
2. This menu will appear on the test picture. Select whichoption best describes the result you have.

https://www.lg.com/us/support/help-library/horizontal-or-vertical-lines-tv-CT10000020-1387209695776
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What causes vertical colored lines on a TV screen? When a TV is showing vertical colored lines, a loose wire cable in the TV might be the cause. If you knock on the back of the TV, the vertical colored lines MAY disappear temporarily. This is a sign that a cable is loose or the T-Con board is faulty.

https://removeandreplace.com/2018/05/01/tv-has-different-color-vertical-lines-on-screen-how-to-fix/

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The horizontal line indicates the vertical deflection circuit is not working. Either the set is stuck in service mode for adjusting color (turns off vertical), or the deflection circuit has failed.

Some RCA TV sets have a "Service" switch in the back, down near the bottom of the set. Most of the newer sets use a combination of remote control and front panel buttons to get into service mode, and that can be turned off by unplugging the set and plugging it back in. Try looking for the mechanically operated service switch in the back first.