Color bars on the TV screen

Stripes on TV screens are a common problem. The reader learns about the possible causes of the malfunction and how to solve it from our article.

Why color bars may appear on the TV screen

Sources of device malfunctions can be divided into two categories. The first group includes temporary problems that may be caused by:

• power surges that can disrupt the functionality of a frame scan or matrix;
• violations of the density of the cable (antenna) connection;
• failure in settings.

The second type includes disturbances in the operation of the elements of the television receiver itself. This group includes damage:

• matrix and its details;
• motherboard.

To eliminate them, repair work of varying degrees of complexity will be required.

Possible defects depending on the type of strip

The user can determine the source of the problem based on the color and thickness of the stripes.

• A thin white horizontal line is a violation of the frame scan. Appears due to power surges.
• A wide purple stripe is a breakdown of the controller on the matrix. This means a defective product.
• Narrow black horizontal or vertical lines - failure of the decoder. It needs immediate repair, otherwise the problem will worsen.
• Multi-colored flickering stripes, ripples and distortions - faulty contact of the matrix cable.
• A thin vertical line in the middle of the screen is a matrix failure. May be caused by power surges.
• One (or more) strip of the same color - failure of the matrix. Needs immediate repair.

What defects can you fix yourself

Consider methods of restoring the device’s operability, which the user can use without prejudice to its further operation.

In case of power surges, turn off the TV (unplug the power plug) and then turn it on again.

Check the operation of the cable (antenna), making sure that the connection between it and the television receiver is tight. If dirt or dust has entered the connector, clean with a dry cloth.

A failure in the settings is resolved by turning on automatic tuning.

RECOMMENDATIONS Clean the TV from dust with a vacuum cleaner and wipe the screen only with special tools (commercially available). Do not use a damp cloth for these purposes. This will protect the product from moisture ingress and, as a result, numerous problems. The device must be installed reliably and firmly to protect it from mechanical damage.

The user can fix some types of faults in the matrix loop contact on their own.

Remove the back of the TV and carefully unscrew the bolts to gain access to the part.

IMPORTANT! Be careful when removing the back and working inside the cabinet to prevent damage.

Possible causes of loop failure:

1. Incorrect connection of contacts. Try to disconnect them (press the latch) and reconnect.
2. Oxidation of the contact group (a greenish coating is visible on it). The contact should be carefully cleaned with a blade. Then check the voltage with a multimeter.

Defects that can only be repaired in the workshop

The main troubleshooting issue is the price. Expensive repairs do not guarantee that after replacing parts, your TV will function properly and correctly. Therefore, you should weigh the pros and cons.

IMPORTANT! If irregularities occur, do not wait for their exacerbation. Contact the workshop immediately.

The loop of the matrix can fail for reasons requiring professional intervention:

• improper use (moisture, dust or dirt getting inside the product, mechanical damage);
• poor assembly.

REFERENCE. A professional diagnosis will be required to find out the cause of the malfunction.

Damage to the matrix controller means marriage. If the warranty period for the product has not passed, ask for the replacement of the TV with another model.

If the matrix cannot be repaired, for example, when the decoder fails, then the part will have to be replaced. The operation to replace it is costly and complicated. It is advisable to purchase a new spare part, it can be ordered at a service center according to the TV model and year of manufacture.

We hope our article helped you understand the reasons for the appearance of bands and how to eliminate them.