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Expert Services

Industrial HMI Repair & Refurbishment

Quick touchscreen digitizer, LCD backlight, and communications port repair.

Service Overview

The Human-Machine Interface (HMI) is the operator's interface with the machinery. Operating on dusty, oily factory floors, HMIs are prone to cracked glass digitizers, unresponsive touch regions, fading LCD backlights, and damaged communication ICs. Usha Engineering Services restores Siemens Simatic panels, Allen-Bradley PanelViews, Pro-face, and other brands. We stock replacement touchscreen glass and LCD backlights for immediate turnaround.

Supported Hardware Series & Models:

Siemens Simatic (TP700, TP1200 Comfort, KTP Series)

Allen-Bradley (PanelView Plus 600, 700, 1000, 1500)

Pro-face (GP3000, GP4000)

Mitsubishi GOT (1000, 2000)

Delta (DOP Series)

Omron (NS, NB Series)

Beijer

Common Failure Modes & Diagnostic Codes

Technical Reference Sheet for Engineers

Code / Symptom	Probable Cause	Engineering Remedy
Touchscreen Unresponsive	Degradation of resistive ITO layers or physical micro-fractures in glass digitizer	Desolder the flexible ribbon cable, remove the cracked digitizer glass, and install a new matching touchscreen panel.
Blank Display / Black Screen	Failed CCFL backlight tube, burnt LED strip, or failed high-voltage inverter board	Replace CCFL backlight with a modern LED backlight conversion kit, or repair inverter transformers.
Boot Loop / Stuck on Logo	NAND flash memory corruption from excessive log writing or operating system crash	Desolder NAND flash chip, reflash firmware using programmer, re-solder chip, and restore factory runtime OS.
Communication Error	Damaged transceiver ICs (MAX232/MAX485) or blown Ethernet isolation transformer	Replace communication driver ICs, optocouplers, or RJ45 port assemblies on the interface motherboard.

Our Premium 6-Step Component-Level Repair Process

How we restore electronic components to manufacturer specifications

Incoming Visual & Thermal Inspection

Every unit is registered and subjected to high-definition visual inspection and thermal scanning. We identify blown trace lines, scorched resistors, swollen capacitors, and signs of liquid ingress before applying any power.

In-Circuit Analog Signature Analysis

Using advanced Tracker/Signature Analyzers (such as Huntron Trackers), we test passive components (resistors, diodes, capacitors, inductors) and active ICs while in-circuit. This safe, power-off testing compares component electrical signatures against known-good standards.

Semiconductor Power-Stage Diagnostics

For VFDs and servo drives, we test the high-power rectifier and IGBT inverter stages. We check the gate-drive circuit paths, desaturation protections, and replace gate optocouplers to prevent catastrophic future failures.

Microscopic Solder & SMT Reflow

Using ISO-certified temperature-controlled desoldering stations, our IPC-trained technicians replace damaged components. We execute precision micro-soldering under stereo-zoom microscopes for multi-layer PCBs.

Controlled Bench & Load testing

After repair, units are powered on via variable-voltage current-limiting power supplies. We run full closed-loop tests under real load conditions—testing communication links, analog/digital feedback loops, and thermal efficiency.

Final QC Certification & Protective Coating

The repaired PCB is cleaned in an ultrasonic chemical bath to remove flux residues. We apply a high-grade conformal coating to protect against moisture, dust, and corrosive industrial oils before releasing the unit with our warranty.

ISO 9001:2015 Certified

Why Choose Usha Engineering?

26+ Years of B2B Expertise

Established in 2000, we possess over a quarter-century of hands-on industrial electronic repair experience. We are an ISO 9001:2015 Quality Management System certified company.

Up to 70% Cost Savings

Repairing high-end industrial controllers and drives with Usha Engineering is significantly more cost-effective than purchasing expensive new OEM replacement units, which also require configuration.

Advanced Component-Level Lab

Our Panchkula HQ facility features state-of-the-art diagnostic equipment including logical analyzers, digital oscilloscopes, curve tracers, thermal imagers, and dedicated load test benches.

Pan-India Logistics & Quick Turnaround

We accept units shipped via secure courier from anywhere in India, offering express 48-hour turnarounds for critical breakdowns to minimize factory downtime.

Industries We Serve

Steel & Metallurgy

VFDs and PLCs controlling blast furnace loaders, rolling mills, heavy crane lifts, and cooling fans.

Textile & Spinning Mills

High-speed servo drives, HMI panels, and control cards on spinning frames, carding machines, and weaving looms.

Paper & Packaging

Multi-drive tension control systems, synchronous motors, and PLC controllers on web presses and slitting lines.

Pharmaceutical & Chemical

HMIs, PCBs, and control modules in pill press machines, packaging lanes, centrifuge drives, and mixing vessels.

CNC & Automotive Machining

Precision spindle drives, servo controllers, and logic units in 3-axis and 5-axis CNC machining centers.

Warranty Protection

3-Month Service Warranty

We stand behind our work. All board-level repairs performed by Usha Engineering Services are covered by a comprehensive 6-month warranty on replaced components and workmanship. We use only original, high-grade semiconductor parts sourced from certified global distributors.

Need Help Immediately?

Submit a diagnostics ticket or speak directly with an engineer to get a free estimate and arrange unit pickup.

Frequently Asked Questions

Clear answers regarding repair procedures, pricing, and warranties

Is the HMI program lost during touchscreen replacement?

No. Replacing the touchscreen digitizer glass or the LCD panel does not affect the HMI's memory chips. Your program and screen designs remain fully intact.

Can you convert older CCFL backlights to LED?

Yes, we recommend converting CCFL to LED. It operates cooler, lasts twice as long, and consumes less power, preventing future inverter-related display failures.

Do you supply replacement HMI front overlays?

Yes, we stock polyester front overlays for common HMI models to replace torn or chemically corroded front membrane keypads.

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