Television Repair Course

Lesson 1 • Signal Input and Processing Chain

Maps the path from antenna or HDMI input through tuner, decoder, and scaler to the panel. Establishes signal flow as a diagnostic framework.

Lesson 2 • Safety Fundamentals for TV Repair

Covers high-voltage hazards, capacitor discharge, and ESD precautions specific to TV work. Safe habits established here apply throughout the entire course.

Lesson 3 • Major Internal Subsystems

Identifies the power supply, main board, T-con board, and panel as distinct functional blocks. Prepares students to isolate faults by subsystem.

Lesson 4 • History and Evolution of TV Systems

Traces analogue CRT through digital flat-panel generations to establish context. Grounds later repair decisions in understanding why designs changed.

Lesson 1 • Specialised TV Diagnostic Equipment

Introduces backlight testers, LVDS signal generators, and IR remote analysers. Specialised tools accelerate fault isolation beyond what a multimeter alone provides.

Lesson 2 • Multimeter and Oscilloscope Use

Teaches voltage, resistance, and continuity measurement with a multimeter plus waveform analysis with an oscilloscope. Both instruments are used in every subsequent chapter.

Lesson 3 • Essential Hand Tools for TV Repair

Covers screwdrivers, spudgers, pry tools, and anti-static tweezers needed for disassembly. Correct tool selection prevents housing and connector damage.

Lesson 4 • Soldering and Desoldering Equipment

Covers soldering iron selection, solder types, flux, and desoldering pumps for component-level work. Proper technique here prevents board damage during repairs.

Lesson 1 • Documenting Repairs with Schematics

Establishes the practice of annotating schematics with measured values and replaced components. Accurate documentation speeds future repairs on the same model.

Lesson 2 • Understanding Circuit Schematic Symbols

Identifies resistors, capacitors, diodes, transistors, and IC symbols used in TV schematics. Symbol recognition is required before any schematic-guided measurement.

Lesson 3 • Interpreting Voltage and Waveform Charts

Teaches how to read reference voltage tables and expected waveform diagrams in service manuals. Comparing measured values to references is the core diagnostic method.

Lesson 4 • Block Diagrams and Signal Flow Maps

Explains how block diagrams simplify complex TV circuits into functional stages. Students use block diagrams to narrow fault location before consulting detailed schematics.

Lesson 1 • Replacing PWM Controller ICs and MOSFETs

Addresses diagnosis and replacement of failed PWM ICs and switching MOSFETs, the most complex power supply repairs. Correct gate-drive verification after replacement confirms full restoration.

Lesson 2 • SMPS Operation Principles

Explains switching regulator topology, PWM control, and feedback loops used in TV power supplies. Understanding normal operation is prerequisite to recognising failure modes.

Lesson 3 • Replacing Capacitors and Diodes

Covers identification of bulged capacitors, leaky diodes, and failed rectifiers as the most common power supply components to replace. Correct part specification prevents repeat failures.

Lesson 4 • Measuring and Testing Power Rails

Applies multimeter and oscilloscope techniques to verify standby, main, and backlight supply rails. Accurate rail measurements confirm whether the fault is in the supply or downstream.

Lesson 1 • CCFL Backlight Systems

Covers cold-cathode fluorescent lamp operation and inverter board function in older LCD sets. CCFL knowledge remains relevant for servicing legacy panels still in use.

Lesson 2 • LED Strip Testing and Replacement

Demonstrates LED strip continuity testing, individual LED forward-voltage checks, and full strip replacement. Correct strip specification matching prevents premature re-failure.

Lesson 3 • Diagnosing Dark Screen and Dim Image

Uses flashlight test, voltage checks, and backlight tester to distinguish panel, driver, and LED strip faults. Systematic steps prevent misidentifying a T-con fault as a backlight fault.

Lesson 4 • Backlight Driver Board Repair

Targets failed boost ICs, shorted MOSFETs, and open feedback resistors on the driver board. Restoring correct driver output eliminates recurring LED failures caused by over-voltage.

Lesson 1 • Diagnosing Video and Display Faults

Applies LVDS signal injection, voltage checks, and panel swap tests to isolate video faults to the T-con, main board, or panel. Systematic isolation avoids replacing expensive panels unnecessarily.

Lesson 2 • T-Con Board Operation and Faults

Explains how the T-con generates gate and source driver timing signals for the LCD panel. T-con faults produce distinctive horizontal lines, half-screen, or blank-panel symptoms.

Lesson 3 • Component-Level Main Board Repair

Covers reflowing BGA ICs, replacing surface-mount capacitors, and restoring broken PCB traces on the main board. Component-level repair reduces cost versus full board replacement.

Lesson 4 • Diagnosing No-Sound and Audio Faults

Isolates audio faults to the amplifier IC, speaker connector, or SoC audio output using signal injection. Audio diagnosis is introduced before video faults due to simpler signal paths.

Lesson 1 • Network and Wi-Fi Connectivity Repair

Troubleshoots Wi-Fi module failures, IP configuration errors, and DNS issues affecting smart features. Network repair restores streaming and app functionality without board replacement.

Lesson 2 • Firmware Flashing via USB and UART

Demonstrates downloading correct firmware, creating a USB flash drive, and using UART serial access for low-level recovery. Correct firmware version matching prevents bricking the set.

Lesson 3 • Diagnosing Software and Boot Failures

Identifies boot-loop, frozen-logo, and black-screen symptoms caused by corrupted firmware or failed updates. Software diagnosis precedes hardware checks when the set partially powers on.

Lesson 4 • Smart TV Operating System Overview

Surveys major smart TV OS platforms, their boot sequences, and update mechanisms. OS familiarity is required before diagnosing software-layer faults.

Lesson 1 • Intermittent and Heat-Related Faults

Covers thermal imaging, freeze spray, and soak testing to locate faults that appear only under temperature or load. Intermittent faults are the hardest to diagnose without these techniques.

Lesson 2 • Multi-Symptom and Secondary Fault Diagnosis

Addresses cases where one failed component causes cascading damage to multiple boards. Recognising secondary faults prevents returning a set with a hidden remaining problem.

Lesson 3 • Post-Repair Testing and Calibration

Defines a complete post-repair checklist covering picture, audio, smart features, and thermal performance. Structured testing ensures every function is verified before returning the set.

Lesson 4 • Repair Quality Standards and Documentation

Establishes professional repair documentation, warranty period expectations, and quality benchmarks. Consistent documentation supports accountability and continuous improvement.