Professional TV, AC & RO Repair Services in Kolkata & Howrah
Welcome to SR Technologies—your premium doorstep service hub for LED/OLED/QLED Smart TVs, Air Conditioners, RO water purifiers, washing machines, refrigerators, microwaves, geysers, and kitchen chimneys. We resolve vertical display lines, AC cooling issues, water purity calibrations, and appliance breakdowns on-site.
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Our Primary Appliance Repair Services
At SR Technologies, we specialize in repairing a wide array of domestic and commercial electronics. Below is the list of our core specialized services, each backed by experienced technicians, specialized diagnostic tools, and quick turnaround times.
Television & Smart TV Repair
Struggling with horizontal lines, vertical lines, double images, or screen flickering on your LED TV screen? Rather than paying for an expensive display replacement, our team offers specialized Chip-on-Film (COF) panel bonding solutions. Using an advanced workshop TAB bonding machine, we repair the core connections directly, restoring your screen panel to factory condition at up to 70% lower costs.
TAB / COF Screen Panel Bonding Machine
High-precision bonding resolves horizontal/vertical line issues without screen replacement.
TV Repair
Doorstep diagnostics and quick repairs for all television systems including motherboard, power board, and sound repairs.
LED TV Repair
Component-level repairs including LED strip replacements and backlight issues.
LCD TV Repair
Motherboard and inverter board troubleshooting for older LCD panels.
OLED TV Repair
Precision board repairs and burnt pixel troubleshooting for high-end OLED screens.
QLED TV Repair
Backlight layer and T-Con board repairs for Samsung and major brand QLED TVs.
Smart TV Repair
OS troubleshooting, firmware upgrades, and WiFi module replacements.
Android TV Repair
Flashing Android TV ROMs and repairing motherboard processor boards.
Air Conditioner (AC) Servicing & Repair
Is your split or window air conditioner blowing warm air, leaking water, or constantly tripping your circuit breaker? Our technicians are experts in split AC and window AC troubleshooting. We offer professional doorstep AC gas filling (R32, R410, R22), compressor diagnosis, capacitor replacement, leak repair, and high-pressure chemical jet cleaning.
High-Pressure Jet Servicing & Gas Filling
Deep jet cleaning, gas charging, and PCB repairs optimize AC cooling efficiency.
AC Repair
Emergency repair of non-cooling ACs, fan motor repairs, and PCB fixes.
AC Installation
Professional mounting, outdoor unit bracket placement, and piping setup.
AC Uninstallation
Safe refrigerant pump-down and dismantling of split or window ACs.
AC Gas Filling
Vacuum testing, leak detection, and nitrogen purging followed by eco-friendly R32/R410 gas refilling.
AC Servicing
High-pressure jet pump cleaning of indoor/outdoor units to remove dust and optimize cooling.
AC AMC
Annual Maintenance Contracts covering seasonal tune-ups, filter cleaning, and breakdown support.
Window AC Repair
Repairing compressor vibrations, chassis cleaning, and mechanical thermostat fixes.
Split AC Repair
PCB troubleshooting, swing motor replacement, and indoor blower fan repairs.
Inverter AC Repair
Specialist repair of double PCB boards, IPM modules, and variable-speed compressors.
Water Purifier (RO/UV) Services
Protect your family's health with our certified water purifier repair and servicing. We diagnose low water flow, filter chokes, pump failures, and sweeten the taste of output water. We replace pre-filters, carbon/sediment block filters, and high-performance RO membranes for all major brands including Kent, Aquaguard, and Livpure.
RO Filter & Membrane Replacements
Replacing sediment and carbon filters ensures safe, sweet tasting drinking water with correct TDS levels.
Water Purifier Repair
Fixing low water flow, motor vibrations, and electrical adapter faults.
RO Repair
Reverse Osmosis membrane replacement and automatic cut-off valve repairs.
RO Installation
Wall mounting, inlet valve piping connection, and post-installation TDS calibration.
RO AMC
Scheduled filter maintenance, TDS checkups, and pre-filter replacements.
Chimney, Washing Machine, Fridge & Geyser Repairs
From kitchen chimney cleaning and suction repair to washing machine gearboxes, refrigerator gas refilling (R134a/R600a), geyser element replacement, and microwave magnetron testing—we bring complete diagnostic kits right to your doorstep.
Deep Oil Clean & Motor Servicing
Baffle filter degreasing, motor checkup, and suction optimization restore smoke-free kitchen environment.
Washing Machine Repair
Fixing drum spin problems, drain pump blockages, and motherboard errors for front/top load washers.
Refrigerator Repair
Defrost timer repairs, gas refilling, and thermostat sensor troubleshooting.
Microwave Repair
Magnetron replacements, turntable motor repairs, and touch membrane fixes.
Geyser Repair
Thermostat changes, heating element replacements, and leakage sealing.
Chimney Repair
Deep degreasing, motor carbon cleaning, and touch panel button replacements.
Brands & Systems We Support
We specialize in out-of-warranty appliance servicing, providing genuine OEM replacement parts, chip-level troubleshooting, and filter components for all top global and national manufacturers.
- Sony
- Samsung
- LG
- Mi
- OnePlus
- Realme
- Panasonic
- VU
- Voltas
- Daikin
- Blue Star
- Hitachi
- Carrier
- LG
- Samsung
- Lloyd
- Kent
- Aquaguard
- Livpure
- AO Smith
- Pureit
- Blue Star
- Godrej
- Whirlpool
- Bosch
- IFB
- Samsung
- LG
- Haier
- Panasonic
Our Work & Service Gallery
Take a look at our technicians in action. We perform on-site troubleshooting for most home appliances, carrying dedicated tools to guarantee a professional job at your doorstep.
Areas We Serve in Kolkata & Howrah
At SR Technologies, we provide same-day doorstep home appliance repair services across an extensive network of locations in Kolkata, Howrah, and the surrounding suburban districts. We maintain dedicated transit routes to ensure that local technicians arrive at your home with diagnostic gear within a 2-hour window of booking.
Howrah & Adjacent Suburban Hubs
From our central operations headquarters in Carryroad, Howrah, we provide rapid support for residents throughout Howrah city, Shibpur (near IIEST and Mandirtala blocks), Santragachi, Liluah, Belur, and Bally. In these areas, our technicians specialize in immediate TV panel line repairs, split AC installation, and kitchen chimney filter deep cleaning. We also service outlying locations like Uluberia, Andul, and Domjur, bringing wholesale spare parts and professional RO water filter services directly to residential neighborhoods.
Kolkata Municipal & Central Core
Our service network extends across all major zones of Kolkata, including the central transit and business hubs around Sealdah, Esplanade, and Park Street. We service commercial establishments, clinics, and residential apartments with emergency AC repairs, geyser servicing, and smart TV motherboard diagnostics.
Salt Lake, New Town & Rajarhat IT Corridor
In the modern high-rise societies, apartments, and IT parks of Salt Lake, New Town, Rajarhat, and Sector V, we offer premium OLED/QLED TV bonding, multi-split air conditioner servicing, and automatic RO water purifier filter kit replacement. Our technicians also cover adjacent residential belts including Baguiati and Lake Town, catering to out-of-warranty domestic appliances.
South Kolkata Residential Zones
We deploy dedicated appliance technicians daily to service the dense housing societies and residential complexes in Behala, Tollygunge, Garia, Jadavpur, Kasba, and along the EM Bypass. We fix front-load and top-load washing machines, double-door refrigerators, and household geysers, offering same-day diagnostic calls.
Northern Suburbs & North 24 Parganas
Residents in the northern suburban corridors of Dum Dum, Barasat, Madhyamgram, and Barrackpore can book quick doorstep calls for refrigerator gas charging, TV display repairs, and water purifier membrane checks. Our local technicians carry complete kits to resolve breakdowns in a single visit.
Common Problems We Fix
Domestic appliances can fail unexpectedly due to voltage fluctuations, wear and tear, or carbon deposits. Here is a guide to the common issues our technicians diagnose and repair on-site.
TV not turning on
Shorthanded transistors, blown fuse, or faulty capacitor on the power board (PSU). We test and repair the motherboard or power board on-site.
TV no display
Sound is working but display stays dark. Indicative of backlight LED strip failure or T-Con board timing issues. We replace LED arrays.
TV sound but no picture
Backlight failure, motherboard video processor faults, or loose LVDS screen panel cable. We repair or re-solder connections.
TV screen flickering
Unstable LED driver circuits, faulty backlights, or failing power adapters. We calibrate voltages and swap driver ICs.
TV lines on screen
Horizontal/vertical lines signify COF/TAB chip-on-film degradation. We use our advanced bonding machine to fix lines without replacing screens.
TV motherboard failure
TV gets stuck on boot logo, restarts randomly, or HDMI/WiFi stops working. We re-flash firmware or replace main ICs.
AC not cooling
Low refrigerant gas levels, dirty condenser/evaporator coils, or faulty compressor run capacitor. We detect leaks and refill gas.
AC gas leakage
Corrosion in copper tubes. We trace leaks using nitrogen pressure, braze the holes, and recharge gas.
AC water leakage
Blocked drain pipes, clogged filter mesh, or ice formation on coils. We perform deep jet cleaning.
RO not filtering
Clogged pre-filter, sediment filter, or RO membrane. We check TDS levels and replace filter cartridges.
RO water leakage
Loose tubing joints, cracked filter housing, or faulty auto-cut solenoid valve. We replace fittings.
RO motor issue
RO booster pump not starting or making heavy vibrating noises due to bearing wear. We rebuild or replace pumps.
Frequently Asked Questions
Q1:Do you provide home service for TV repair in Kolkata?
Yes, SR Technologies provides 100% doorstep smart TV repairs in Kolkata, Howrah, and nearby areas. Our technicians carry diagnostic tools directly to your home.
Q2:What is the cost of LED TV panel bonding in Howrah?
LED panel bonding starts at around ₹1,500 - ₹2,500 depending on the panel size and number of vertical/horizontal lines to be fixed. It is up to 70% cheaper than screen replacement.
Q3:Do you repair OLED and QLED TV screens?
Yes, we specialize in high-end OLED and QLED TV repairs. We troubleshoot power boards, T-Con boards, and backlight layers for all major premium brands.
Q4:Why does my TV have sound but no picture?
This is a classic symptom of backlight LED strip failure. The TV is working and rendering sound, but the light source is broken. We replace the LED strips to restore the picture.
Q5:Can you fix a TV that is not turning on?
Yes. This is usually caused by a power surge damaging the capacitors, diodes, or fuses on the TV power board. We repair or replace these components on-site.
Q6:What brands of TVs do you repair?
We service all major brands, including Sony Bravia, Samsung, LG, Mi, OnePlus, Realme, Panasonic, VU, TCL, Toshiba, Sansui, Lloyd, and Philips.
Q7:Do you use genuine spare parts for repairs?
Yes, we source and use high-quality, certified spare parts (such as original COF tabs, LED strips, capacitors, and RO membranes) to ensure longevity.
Q8:Do you provide a warranty on repairs?
We provide a 30 to 90 days service warranty on replaced spare parts and panel bonding services, depending on the component.
Q9:Is there a charge for diagnosing my appliance at home?
We charge a minimal visiting and diagnostic fee of ₹299, which is adjusted in the final repair bill if you proceed with our service.
Q10:How long does a typical TV motherboard repair take?
Most motherboard repairs, including software re-flashing or port replacements, are completed within 24 to 48 hours.
Q11:Why is my Smart TV not connecting to WiFi?
This could be due to a faulty internal WiFi card module, outdated TV firmware, or router compatibility issues. We diagnose and replace the internal WiFi module if needed.
Q12:Can you repair TV remote control sensor issues?
Yes, if the TV does not respond to a working remote, we replace the internal infrared (IR) receiver sensor board on the TV chassis.
Q13:What is the cost of TV display screen repair?
If the physical glass of the screen panel is cracked, display replacement is required, which is expensive. However, if the screen displays vertical/horizontal lines or double images without physical cracks, we can fix it using TAB bonding for a fraction of the cost.
Q14:What causes vertical or horizontal lines on an LED TV?
Lines are caused by moisture or dust corroding the COF (Chip-on-Film) bonding ICs connecting the motherboard to the glass panel. We use high-precision TAB bonding machines to replace these chips.
Q15:Can I transport my TV to your service center myself?
We recommend letting our technicians inspect the TV at your home first. If a workshop repair is needed, our team safely transports the TV in custom shockproof packaging.
Q16:Do you fix smart TV software lag and app errors?
Yes, we clear memory chokes, re-flash Android TV OS, upgrade firmware, and configure smart app compatibilities on-site.
Q17:How can I prevent my TV screen from getting vertical lines?
Avoid spraying water or liquid cleaners directly on the screen glass, as liquid trickles down the borders and rusts the delicate tab bonding ICs. Always spray cleaner onto a microfiber cloth first.
Q18:How do I book a doorstep AC repair service?
You can book by calling +91 85840 81945, sending a WhatsApp message to our desk, or filling out the request form on this page.
Q19:What are your AC gas filling charges in Kolkata?
AC gas refilling charges start at ₹2,550, which includes complete leak detection, vacuuming, copper brazing, and refilling of R32, R410, or R22 refrigerant.
Q20:Why is my AC running but not cooling the room?
This is usually caused by low refrigerant gas levels due to a leak, dirty cooling coils blocking heat exchange, or a failed compressor capacitor.
Q21:How often should I get my split AC serviced?
We recommend professional jet-pump servicing at least twice a year—once before summer starts and once mid-season—to maintain efficiency.
Q22:What is covered under an AC Annual Maintenance Contract (AMC)?
Our AC AMC covers two deep wet services, unlimited breakdown calls, and priority technician allocation throughout the year.
Q23:What causes AC water leakage inside the room?
Inside water dripping is caused by a clogged drain pipe (accumulated dirt/muck), dirty air filters, or refrigerant leakage causing ice to melt.
Q24:Can you repair AC PCB boards on-site?
Minor PCB issues like relay replacement or fuse swaps can be done on-site. For major microcontroller IC repair, we bring the PCB to our workshop.
Q25:Do you provide AC installation and uninstallation in Kolkata?
Yes, we provide safe AC uninstallation (trapping the gas first) and professional mounting/installation with vacuuming.
Q26:What is the difference between split and window AC repair?
Split ACs have separate indoor/outdoor units with complex control PCBs, while window ACs are compact single-cabinet units. We repair both.
Q27:How do I fix a noisy AC outdoor unit?
Noise is usually caused by loose cabinet screws, unbalanced fan blades, or worn-out compressor rubber mounts. We tighten fittings and swap mounts.
Q28:Do you offer same-day AC gas charging services?
Yes, we offer same-day emergency AC gas refilling and leak repair across Kolkata and Howrah.
Q29:What are the signs of an AC compressor failure?
Signs include the AC blowing warm air, the outdoor unit making humming sounds but not starting, or the main circuit breaker tripping repeatedly.
Q30:Do you repair inverter AC models?
Yes, our technicians are trained in repairing variable-speed inverter compressors and dual PCB communication errors.
Q31:What is the cost of window AC servicing?
Window AC servicing starts at ₹499 and includes chemical washing, filter cleaning, and checking refrigerant pressures.
Q32:Why does my AC blow bad-smelling air?
Foul odor indicates mold, mildew, or algae growth inside the blower unit and drain tray due to stagnant moisture. A deep jet wet wash removes this growth.
Q33:Is it normal for the AC outdoor unit to blow hot air?
Yes, the outdoor condenser unit is responsible for releasing heat extracted from your room. If it is not blowing hot air, the compressor is not running or there is a refrigerant blockage.
Q34:How much does RO water purifier filter replacement cost?
A complete filter kit replacement (Sediment, Pre-Carbon, Post-Carbon) starts at ₹1,200. Original RO membrane changes start at ₹1,800.
Q35:Why is my RO water purifier leaking water from the bottom?
This is caused by loose elbows/connectors, high inlet water pressure cracking the filter housing, or a failed auto-cut valve.
Q36:What is the average life of an RO membrane?
An RO membrane typically lasts 1.5 to 2 years, depending on the TDS levels of the input water and usage volume.
Q37:What is a water purifier AMC and is it necessary?
RO AMC includes scheduled filter replacements and TDS monitoring every 4 months, ensuring your drinking water remains safe and sweet.
Q38:Why is my water purifier showing low water flow?
Low flow indicates clogged pre-filters or a drop in RO booster pump pressure. We test the pump output using a pressure gauge.
Q39:Do you service Kent and Aquaguard RO systems in Howrah?
Yes, we repair and service all popular water purifiers including Kent, Aquaguard, Livpure, AO Smith, Pureit, and Blue Star.
Q40:What should the ideal TDS level of drinking water be?
The ideal TDS (Total Dissolved Solids) level for drinking water is between 80 to 150 mg/L. We calibrate your RO system to this range.
Q41:Can you install a new RO purifier at my home?
Yes, we offer wall mounting, inlet plumbing connections, pre-filter installation, and water output calibration services.
Q42:Why is my RO booster pump making a loud vibrating noise?
Loud noise is caused by worn-out internal pump bearings or diaphragm degradation. We rebuild or replace the pump.
Q43:What is the function of the carbon filter in an RO system?
The carbon filter adsorbs organic impurities, chlorine, pesticides, and unpleasant odors, improving taste and protecting the RO membrane.
Q44:Why is my RO tank not filling up?
This can be caused by low inlet water pressure, a choked membrane, a failed solenoid valve blocking flow, or a faulty float switch.
Q45:Do you provide doorstep washing machine repair in Kolkata?
Yes, we service top-load, front-load, and semi-automatic washing machines directly at your home.
Q46:Can you fix a washing machine drum that won't spin?
Yes, this is usually caused by a snapped drive belt, a failed start capacitor, motor carbon brush wear, or a faulty door lock switch.
Q47:Why is my washing machine not draining water?
Drainage issues are caused by coins/pins clogging the drain filter, a jammed drain pump motor, or a faulty drain valve solenoid.
Q48:What is the cost of refrigerator gas refilling in Howrah?
Refrigerator gas refilling starts at ₹1,800, which includes leak testing, capillary filter replacement, vacuuming, and charging R134a or R600a gas.
Q49:Why is my double door fridge not cooling at the bottom?
This is caused by a defrost cycle failure (failed defrost timer, bi-metal thermostat, or thermal fuse) blocking the air passage with ice.
Q50:Do you repair microwave oven magnetron issues?
Yes, if your microwave runs but does not heat food, it is a failed high-voltage magnetron or diode. We replace them safely.
Q51:Why is my microwave turntable not rotating?
This is caused by a burned-out synchronous glass tray motor underneath the cavity floor. We replace the motor on-site.
Q52:Can you repair geyser heating elements on-site?
Yes, we carry replacement elements and thermostats for standard geysers and replace them at your home within an hour.
Q53:Why is my geyser leaking hot water?
Leakage is caused by high water pressure cracking the inner tank, or a degraded gasket seal. We replace seals and inspect pressure release valves.
Q54:How do I book a kitchen chimney deep cleaning service?
You can book a chimney cleaning online via our form or call us directly. We dismantle the chimney, degrease filters, and clean the blower motor.
Q55:Why has my kitchen chimney lost its suction power?
Heavy oil and grease deposits on the baffle filters or blower fan restrict airflow. A deep wet service restores suction power.
Q56:What brands of kitchen chimneys do you service?
We service Faber, Glen, Hindware, Elica, Kaff, and local brand kitchen chimneys.
Q57:Do you charge extra for weekend services?
No, our service rates are the same on weekends. We work all 7 days to provide emergency appliance support.
Q58:What is your policy on out-of-warranty appliance repairs?
We specialize exclusively in out-of-warranty appliance repairs, offering affordable component-level fixes that save money compared to authorized centers.
Q59:How do I pay after the repair service is completed?
We accept Cash, GPay, PhonePe, Paytm, and UPI payments after you test and verify the repaired appliance.
Chambers & Workstations
SR Technologies Head Office
107/5 Shiek Para Lane, Carryroad, Howrah - 711104
SR Technologies is an autonomous, out-of-warranty multi-brand electronic service provider. All brand names, trademarks, logos, and manufacturer models (e.g. Sony, Samsung, Kent, Aquaguard, Voltas, etc.) mentioned on this page are used strictly for reference purposes to identify appliance compatibility and do not imply direct manufacturer affiliation or authorized service center status.