Check if Your T-Con Board Needs Replacement – Step-by-Step

The T-Con (Timing Control) board is a key component of your LED TV that controls image clarity, color accuracy, and overall display performance. When it fails, your TV may display various symptoms — but not all screen problems are caused by a bad T-Con board.
Follow this guide to determine if your board is faulty before ordering a replacement.

Common Symptoms of a Faulty T-Con Board

  • No picture, but the TV has sound

  • Vertical or horizontal lines across the screen

  • Flickering, double images, or ghosting

  • Washed-out or incorrect colors

  • Half of the screen is black or distorted

  • Screen turns white or shows random colors

Step 1 – Rule Out Other Causes

Before opening your TV, try these quick checks:

  • Restart the TV and check HDMI connections

  • Test with a different input source (e.g., USB, different HDMI port)

  • Verify the main board is functioning (menu should still display if T-Con is fine)

Step 2 – Visual Inspection of the T-Con Board

  1. Unplug the TV and remove the back cover.

  2. Locate the T-Con board (usually top-center, connected to the panel by ribbon cables).

  3. Check for visible damage — burnt marks, bulging capacitors, or corrosion.

  4. Inspect ribbon cable connectors for loose fittings or bent pins.

Step 3 – Voltage Testing (Technician Only)

  1. With the TV powered on, use a multimeter to check key voltages on the T-Con board (VGH, VGL, VCOM).

  2. Compare readings with the manufacturer’s specifications.

  3. Abnormal or missing voltages may indicate a faulty T-Con board.

Step 4 – Eliminate Cable Issues

  • Reseat and clean the ribbon cables with isopropyl alcohol.

  • Test the TV again — sometimes display issues are caused by poor cable contact, not the board itself.

Step 5 – Confirm with Part Swap (Optional)

If possible, test with a known-good T-Con board of the same model.
If the display works fine, your original board needs replacement.

💡 Pro Tip:
If your TV shows no picture and no on-screen menu, the problem could also be with the main board or LED panel. Always test systematically before replacing parts.