Deep Roots in Traditional Colour Television Repair
Before LED and LCD displays became ubiquitous, cathode ray tube (CRT) colour televisions formed the entertainment center of Indian households. Many reputable legacy colour TVs—from brands like BPL, Onida, Videocon, LG, Samsung, Sony Trinitron, and Philips—continue to serve reliably in homes, shops, and security monitoring setups.
Finding an experienced technician who understands analog chassis design, horizontal output transistors (HOT), flyback transformers (FBT), and shadow mask convergence can be challenging today. Having entered the trade over 27 years ago, Laxman at BL Electronics possesses firsthand mastery of analog colour television circuitry.
Common CRT Colour TV Faults We Resolve
- Horizontal Bright Line (Vertical Collapse): The screen shows only a thin bright line across the center, caused by vertical output IC breakdown or faulty coupling capacitors.
- No Display with Ticking / Chirping Noise: Indicates a shorted horizontal output transistor or an overloaded flyback transformer pulling down the main B+ rail.
- Rainbow Color Patches on Screen (Degaussing Failure): Malfunctioning thermistor (PTC) or degaussing coil circuit leaving magnetized color distortion across the tube face.
- Picture Rolling or Jittering: Sync separator stage failures causing vertical or horizontal hold instability.
- Dark Picture with Good Sound: CRT heater filament supply failure, low screen voltage (G2), or aging cathode emission.
Frequently Asked Questions About Colour TV Repair
Yes. While many newer shops only handle flat screens, BL Electronics has 27 years of active electronics practice and continues to service conventional colour CRT televisions.
A single horizontal line across the screen indicates a vertical deflection stage failure, usually due to a blown vertical output IC, dried electrolytic capacitors, or an open yoke winding.
No, absolutely not. CRT picture tubes hold extra-high tension (EHT) voltages exceeding 20,000 to 25,000 volts even after days without power. Only qualified technicians should service CRT cabinets.