LCD (Liquid Crystal Display) televisions are a type of flat-panel display technology commonly used for televisions and computer monitors. They work by manipulating liquid crystals placed between two layers of glass to control the passage of light, creating images on the screen. Here's a basic overview of how LCD televisions work:

1. Light Source: A light source (usually fluorescent tubes or LEDs) provides a backlight behind the LCD panel. This backlight emits white light.

2. Polarization: The light passes through a polarizing filter, which aligns the light waves in a specific direction.

3. Liquid Crystals: The aligned light then passes through a layer of liquid crystals. These crystals can be electronically controlled to twist and untwist, altering the orientation of the light passing through them.

4. Color Filters: A layer of color filters is placed over the liquid crystals. These filters are arranged in red, green, and blue (RGB) subpixels, which together create a full-color image.

5. Pixel Control: By controlling the orientation of the liquid crystals and the intensity of the backlight, individual pixels can be selectively illuminated or darkened. This creates the image on the screen that you see.

6. Viewing Angle Enhancement: Some LCD panels use additional layers or techniques to improve viewing angles and reduce color and contrast distortions when viewing the screen from different angles.

Common Problems with LCD Televisions and Repair Solutions:

1. Dead Pixels: Pixels that remain stuck in one color or are completely black are called dead pixels. Unfortunately, dead pixels are often not repairable, but you can try using software or videos designed to fix stuck pixels by rapidly changing colors.

2. Backlight Issues: Backlight problems can lead to uneven lighting, dark spots, or a completely dark screen. If the backlight fails, it might be necessary to replace the backlight assembly, which can be complex and may require professional repair.

3. Image Persistence (Image Retention or Burn-In): This occurs when a static image is displayed for extended periods, causing a ghost image to remain even when the content changes. To prevent image retention, avoid displaying static images for too long, and use screen savers when possible.

4. Color Distortion: Incorrect colors or color imbalances can occur due to problems with the color filters, the liquid crystals, or the electronics driving the display. Some cases might require professional calibration or repair.

5. Lines or Artifacts: Horizontal or vertical lines, artifacts, or flickering can result from issues with the display driver circuitry. In some cases, this can be repaired by replacing faulty components.

6. No Display or Power Issues: If your TV isn't turning on or displaying an image, it could be due to power supply problems, faulty connections, or other internal issues. Check power cables, fuses, and connections first. If the issue persists, professional repair might be needed.

7. Slow Response Time or Motion Blur: Some LCD panels might exhibit slower response times, leading to motion blur in fast-moving scenes. This issue is less common in newer LCD technologies like LED-backlit displays.

For any significant issues, it's recommended to consult the manufacturer's support or seek professional repair services, as attempting to repair complex internal components without the proper knowledge can cause further damage.