Sony LED 4k Google TV KD-43X75L Logic Or Tcon Board
Description
1. Function & Role
Primary Function: Acts as the bridge between the Mainboard and LCD Panel. It translates video data from the main processor into precise timing signals for the individual pixels on the 4K screen.
Output Specs: Drives 4K Ultra HD resolution (3840 \times 2160) at 50/60 Hz.
2. Common Hardware & Connectors
Inputs: High-speed LVDS or V-by-One ribbon cable coming from the Mainboard.
Outputs: Dual FFC (Flat Flexible Cable) ribbon leads connecting directly to the display panel side boards.
On-Board Circuits: Includes gamma processing ICs, power management (DC-DC conversion for V_{GH}, V_{GL}, V_{COM} voltages), and timing logic ICs.
3. Fault Symptoms (When Replacement is Needed)
Screen shows vertical or horizontal lines, half-screen display, or distorted/flickering colors.
TV has sound but no image (or a blank white/black screen while backlights remain lit).
4. Key Replacement Tip
Match Board Numbers: Sony uses multiple panel suppliers (e.g., AUO, BOE, LG Display) across batches. Match the exact PCB Part Number (printed on the board or white barcode sticker) rather than just the TV model number to ensure connector compatibility.