Top TV Repair & Service Centers in Sealdah, Kolkata

A television that fails to turn on and shows no signs of power (no standby light, no sound, and no display response) is usually suffering from a failure in its power supply unit (PSU). This board converts high-voltage AC from your wall outlet into the low-voltage DC required by the motherboard and backlight strips. The most common causes of PSU board failure are voltage surges, lightning strikes, or age-related wear on the electrolytic capacitors. These capacitors store electrical energy, and over time they can bulge, leak, or fail, disrupting power delivery. Other vulnerable components include the main fuse, varistors (which absorb voltage spikes), and rectifier diodes. Our technicians diagnose this on-site by opening the TV chassis and testing the power board with a digital multimeter. We check the standby voltage rails (typically 3.3V or 5V) and primary capacitor levels. Instead of replacing the entire power board, we perform component-level repairs—replacing swollen capacitors, blown fuses, and shorted transistors on the spot. This restores stable power to the motherboard and brings your TV back to life safely at a fraction of the cost.

If your television turns on, its power indicator light changes from standby to active, and sound plays normally, but the screen remains completely black, the TV is experiencing a display failure. The most common cause is a burnt-out LED backlight strip. LED TVs rely on rows of light-emitting diodes to illuminate the liquid crystal display (LCD) panel. If one or more diodes in the circuit fail, the LED driver circuit detects a voltage fault and shuts down power to the entire backlight array to prevent further damage. Another common cause is a faulty T-Con (Timing Controller) board, which translates the video signals from the motherboard into horizontal and vertical instructions for the display panel. A third possibility is a failed power rail on the motherboard itself. Our technicians diagnose this using the 'flashlight test.' We turn the TV on in a dark room and shine a flashlight close to the screen. If we can see a faint image of the video or menu text, the LCD screen is working, but the backlight system has failed. We resolve this by replacing the entire set of LED backlight strips with original, manufacturer-matching parts on-site. This ensures even brightness across the screen and prevents future failures, which are common when only individual diodes are replaced.

When a TV renders audio normally but shows no picture, it is usually a symptom of a failed backlight power circuit or a timing control board failure. In modern LED TVs, the display glass itself is transparent; it requires a strong light source behind it to make the image visible. If the LED driver circuit on the power board fails or the LED strips burn out, the screen stays dark while the audio section continues to function. This issue can also be caused by a faulty LVDS (Low-Voltage Differential Signaling) cable connecting the motherboard to the T-Con board. If this cable becomes loose, dirty, or corroded due to humidity, video data cannot reach the screen, resulting in a dark display with normal sound. Our technicians use specialized diagnostic tools to check the backlight output voltage from the power board. If the voltage is normal, we test the LED strips individually. If the issue is a faulty LVDS connection or a failed T-Con board, we clean the contact pins, replace damaged cables, or repair the control board to restore the video signal path, returning the picture to your screen.

A television status light that blinks repeatedly when you try to turn it on indicates that the system's self-diagnostic program has detected a hardware fault. Brands like Sony, Samsung, and Panasonic use specific blinking patterns to identify which circuit is failing. For example, a Sony TV blinking red light six times indicates a backlight failure, while a two-blink pattern points to a power board issue. These error codes help prevent further damage by locking the TV in a protective standby mode. Blinking standby lights are usually caused by failing capacitors on the power supply board, voltage drops in the backlight array, or communication errors between the motherboard and timing controller. Our technicians carry manufacturer service manuals and diagnostic equipment to translate these error codes on-site. We open the TV, check the power lines, and test the circuit boards to locate the faulty component. We repair the power circuits or replace the faulty boards to clear the error code, restoring your TV to normal operation.

Vertical lines on a TV screen—ranging from a single thin colored line to thick black bars—usually indicate a connection issue between the display glass panel and the source driver boards. These connections are made of delicate Chip-on-Film (COF) ribbon cables bonded to the edges of the glass panel. Over time, heat, humidity, or liquid glass cleaners sprayed directly onto the screen can corrode the conductive glue holding these tabs in place, disrupting video signals and causing vertical lines. This issue can also stem from a faulty T-Con board or a loose ribbon cable connection. Our technicians inspect the display panel using high-magnification tools on-site. If the lines are caused by a loose cable or a T-Con fault, we reseat the connections or replace the board. If the lines are caused by degraded COF bonding, we transport the TV safely to our workshop. There, we use an industrial TAB bonding machine to align and bond a new COF chip to the glass panel using conductive tape under precise heat and pressure. This repairs the line issues and restores the display without requiring an expensive screen replacement.

Horizontal lines on a TV screen are typically caused by gate driver failures within the display panel or gate COF chip degradation. Unlike vertical lines, which are driven from the top or bottom of the screen, horizontal lines are controlled by gate drivers along the sides of the panel. When these gate paths are damaged by moisture, dust, or voltage surges, they fail to switch the pixels row-by-row, resulting in static or colored horizontal lines, screen flickering, or double images. Our technicians diagnose horizontal lines on-site, checking the output voltages of the T-Con board (such as VGH and VGL rails). If these voltages are unstable, we calibrate the regulator circuits. If the issue is caused by a damaged gate COF chip, we use our workshop TAB bonding machine to replace the chip. In cases where the lines are caused by internal shorts in the glass panel, we can bypass the damaged gate lines using micro-jumpers on the panel board. This restores the sync signals and clears the horizontal lines, saving you from a costly screen replacement.

If your Smart TV is unable to connect to your home WiFi, frequently drops its connection, or shows greyed-out network settings, the issue is usually a faulty internal WiFi card module, corrupted system firmware, or signal interference. Modern Smart TVs use small, dedicated WiFi/Bluetooth modules connected to the motherboard via a USB ribbon cable. These modules are sensitive to heat and voltage fluctuations, which can cause their wireless chips to fail. Corrupted system firmware can also cause connection drops by preventing the operating system from loading the correct network drivers. Our technicians test the TV's network functions on-site. We check for wireless signals and verify the internal card status in the system menus. If the settings are unresponsive, we open the TV chassis, inspect the WiFi module connections, and test its power supply line. We replace faulty WiFi modules with original, matching parts. If the issue is software-based, we flash the latest official firmware using a USB drive to restore stable, high-speed wireless connectivity.

HDMI port issues are common due to frequent cable plugging, heavy cables straining the ports, or voltage surges traveling through connected devices like set-top boxes or consoles. Symptoms include a 'No Signal' message on the screen, audio playing without video, or video signal flickering. The cause is usually physical damage to the port's internal pins, or a short circuit in the electrostatic discharge (ESD) protection diodes on the motherboard. In some cases, the main HDMI switcher IC can fail due to power surges, disabling all HDMI inputs. Our technicians troubleshoot HDMI issues on-site. We check the ports for physical wear and test the signal lines with a multimeter. We replace damaged HDMI ports using micro-soldering tools. If the switcher IC is damaged, we replace the chip on the motherboard, restoring clean digital audio and video connections.

If your TV does not respond to its remote control despite using fresh batteries, the issue is typically a failed infrared (IR) receiver sensor on the TV, a pairing error with a Bluetooth remote, or a mainboard logic fault. Modern TVs use a small sensor board on the lower bezel that houses the IR receiver, standby LED, and manual power button. These sensor boards can fail due to moisture, dust, or power fluctuations, preventing the TV from receiving remote signals. Bluetooth remotes can also lose their pairing settings due to system updates or low battery voltage. Our technicians diagnose this on-site, testing your remote with an IR signal detector. If the remote is working normally, we test the TV's internal sensor board. We replace faulty IR receiver boards and reprogram Bluetooth remotes to match the TV's system, restoring convenient and reliable remote control operation.