How Electronic Components Work on Television

Electronic components on a TV’s PCB (printed circuit board) work together to convert electrical power and signals into visible images and sound. The PCB is the “green board” inside the TV that holds resistors, capacitors, diodes, transistors, ICs, and power‑related circuits, connected by copper traces. 

Typical PCBs in a TV and their roles
Inside most LED/LCD TVs you will find several PCBs connected together:
Power‑supply / Main SMPS PCB
Converts AC mains (110/220 V AC) into several DC voltages (e.g., 5 V, 12 V, 24 V) for the main board, backlight, and audio. 

Main board / Main PCB
Contains the CPU, memory, tuner, HDMI/AV input processing, and display driver logic. 

Backlight / LED driver / Inverter PCB (older LCD)
Drives the LED strips or CCFL backlight with controlled current or high‑frequency AC.

T‑Con (Timing‑Controller) / Panel PCB (in some models)
Receives LVDS or similar video signals from the main board and drives the column/row lines of the LCD panel. 


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