T-CON BOARD FAIL
LG TV & Audio · OLED55B3PUA 55" Class B3 4K OLED Smart TV
Timing Controller board translates main board video signal into pixel-level control for the panel. Symptoms: vertical lines, horizontal lines, image distortion, washed-out colors, double images, or half screen dark. Located between main board and panel, connected by ribbon cables. T-CON replacement is cost-effective — boards typically $30-80.
Error T-CON BOARD FAIL on the LG TV & Audio OLED55B3PUA 55" Class B3 4K OLED Smart TV means: T-CON Board Failure. The top-ranked community fix is “Replace the T-CON Board” (hard difficulty, ~60 min, DIY cost: $30-$80). 2 community-ranked fixes available below.
Published February 2026 · 2 fixes · tv
Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.
While many tv repairs can be done safely at home, consider hiring a qualified technician if:
Average professional repair cost for this issue: $200-$350.
tv · 2 fixes
tv · 2 fixes
tv · 2 fixes
tv · 2 fixes
tv · 2 fixes
tv · 2 fixes
OLED Panel Over-Temperature
App Freezes or Crashes
Audio Out of Sync with Video
Horizontal or Vertical Banding
Power Supply Overcurrent / Short
Main Board Failure
Inverter / Backlight Driver Failure
T-CON Board Communication Error
The LG TV & Audio OLED55B3PUA 55" Class B3 4K OLED Smart TV has 8 other known error codes:
Error code T-CON BOARD FAIL also appears on 6 other LG TV & Audio models:
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