---Partial part number (4374A) can be found on barcode sticker on board.
IMPORTANT: Horizontal lines on the screen are virtually NEVER caused by a bad T-con board. Horizontal lines indicate a defective LCD panel (screen).---
Sony 1-895-900-21 (6871L-4374A) T-Con Board
Part Number: 1-895-900-21
Visible Number: LC550EQL-SJA1-831
Visible Number: 6870C-0601A
Visible Number: 6871L-4374A
Warranty: 180-Day Warranty
Manufacturer Part Number: Sony 1-895-900-21
Known Models
Sony XBR-55X850D
Sony XBR-55X855D
Sony XBR-55X857D