HMI & Touchscreen Repair — UK Wide | Newcastle Upon Tyne
HMI & Touchscreen Repair UK |
Operator Panels & Displays
When an HMI fails, your operators lose visibility and control of the process. We repair human machine interfaces, industrial touchscreens, operator panels, and display units at component level — diagnosing the fault and returning the unit tested and ready to run. Faster and more cost-effective than replacement.
Northern Power Electronics repairs industrial HMIs, touchscreens, operator panels, and display units at component level in Newcastle upon Tyne. We work on all major brands — Siemens, Allen Bradley, Mitsubishi, Omron, Schneider Electric, Proface, Beijer, and more — including obsolete and discontinued models where the OEM no longer provides support or replacement parts.
HMI and display types we repair
Resistive and capacitive touch panels. Unresponsive, inaccurate, or dead touch zones diagnosed and repaired at component level.
LCD and TFT industrial screens with brightness loss, dead pixels, flickering, or no display output. Backlight and driver board repair.
Push-button, membrane keypad, and function key operator panels. Key failures, membrane wear, and control board faults repaired.
Panel-mounted and rack-mounted industrial computers with display, board, or power supply faults. Including legacy IPC hardware.
Legacy CRT industrial monitors still in service on older machinery. Deflection, power supply, and tube-related faults diagnosed.
Remote operator interfaces, junction box displays, and distributed HMI panels. Communication and display faults resolved.
We also repair plasma displays, monochrome panels, membrane overlays, and multi-axis motion control interfaces. If your HMI type is not listed, contact us — we assess most industrial display and interface technology.
HMI faults we diagnose and repair
Backlight degradation or failure is one of the most common HMI faults in older displays. Backlight assemblies and driver boards repaired or replaced.
Flickering screens caused by failed capacitors on the display driver board, loose ribbon cables, or failing backlight inverters. Root cause identified before repair.
Lines across the screen indicate failed column or row drivers on the LCD panel or driver board. Diagnosed and repaired at component level where possible.
Touchscreen that does not respond or registers incorrect positions. Touch controller failure, digitiser damage, or ribbon cable faults identified and repaired.
Localised pixel failure, blank zones, or partial display loss. Display panel and driver board assessed for root cause before any repair is carried out.
Power supply faults within the HMI unit itself — failed regulators, blown fuses, capacitor failure on the PSU board. Full power section diagnosis.
Intermittent resets, lockups, or slow boot caused by memory faults, processor issues, or unstable power rails on the main control board.
HMI showing communication errors or failing to connect to the PLC or control system. Communication hardware and protocol configuration checked and repaired.
Membrane keys that no longer register or require excessive pressure. Membrane overlay and keypad controller assessed — membrane replacement where required.
Physical screen damage causing display failure. Display panel assessment and replacement where the screen is integral to the unit and cannot be replaced separately.
Obsolete HMI repair — when no replacement exists
Many industrial facilities run HMIs and operator panels that were manufactured in the 1990s and 2000s — hardware that the OEM discontinued years ago. When these fail, there is no new replacement available at any price. The choice becomes: repair it, or replace the entire machine control system at enormous cost.
We repair obsolete and discontinued HMIs that other companies turn away. Using ABI BoardMaster diagnostics, we can reverse-engineer control boards without original schematics, source period-correct components, and return the unit to full working order. We have repaired HMIs from machines still in production that the original manufacturer stopped supporting over a decade ago.
If you have an obsolete HMI with no available replacement, contact us with the make, model, and fault description before assuming it cannot be repaired.
Our HMI repair process
Receive, log & inspect
Your HMI is logged on receipt and visually inspected for physical damage, contamination, and signs of prior failure. The display, touch interface, power section, and control boards are checked before any test power is applied.
Component-level fault diagnosis
We test down to component level using specialist HMI test equipment and ABI BoardMaster diagnostics. We identify exactly what failed and why before any repair begins — preventing repeat failures caused by an underlying fault that was not found.
Written quotation
A written quote is provided covering all work required. If the HMI is beyond economic repair — for example where a cracked LCD panel costs more than a refurbished equivalent — we advise you clearly and honestly.
Component repair and replacement
Faulty components are replaced with quality parts to the original specification. Backlight assemblies, driver boards, capacitors, touch controllers, and membrane overlays are replaced as required.
Functional testing
The repaired HMI is powered up and tested for full display function, touch accuracy, communication, and software operation. We do not return an HMI until it has passed functional testing and we are satisfied it will perform correctly in service.
Repair report & return
A full repair report is provided — fault found, work carried out, and components replaced. Useful for your maintenance records and ISO 9001 audit trail. Returned by courier with warranty confirmed in writing.
HMI & operator panel repairs from our workshop
HMI manufacturers we repair
Industries we serve
HMI failures occur across every sector where machinery and processes are controlled electronically. We carry out HMI repair for customers from offshore platforms to food production lines.
Control room HMIs, wellhead operator panels, and process control interfaces on offshore platforms and rigs.
View service →Bridge and engine room HMIs, navigation displays, and vessel control panels on commercial and specialist vessels.
View service →Production line operator panels, CNC machine interfaces, and packaging line HMIs across all manufacturing sectors.
View service →SCADA operator interfaces, power station control panels, and utility sector HMIs requiring specialist repair.
View service →Crane cab displays, concrete plant control terminals, and construction equipment operator interfaces.
View service →Assembly line control terminals, test rig HMIs, and production process interfaces on automotive plant equipment.
View service →Why customers choose NPE for HMI repair
HMI repair requires a different skill set from drive or PCB repair. Here is what matters most.
Replacing an HMI often means reprogramming screens and re-mapping tags to a new control system. We repair the original hardware so your existing programme, graphics, and machine settings stay intact.
Backlight failure, driver board faults, and touch controller issues all present as "screen problems" but have different root causes. We test down to the specific failed component rather than replacing the whole display assembly.
Many HMIs still running production lines were discontinued by the OEM ten or twenty years ago. Using ABI BoardMaster, we reverse-engineer control boards without original schematics and keep these panels running.
Every repaired unit is functionally tested for touch response across the full screen area and display clarity, not just powered on and visually checked.
An HMI failure often stops a whole line, not just one machine function. We assess within 1–2 working days so you're not left without visibility and control for long.
A written report covers the fault found, components replaced, and confirmation that software/settings were retained — useful for maintenance records and audit purposes.
Frequently Asked Questions
Will the software and parameters be retained after repair?
In most cases, yes. Where the fault is hardware-related and the memory or software storage is intact, settings and programmes are retained. If there is a risk of software loss during repair, we advise you in advance. We recommend customers keep a backup of HMI programme files where possible — we can advise on how to do this before shipping.
How should I package my HMI to protect the screen in transit?
The screen is the most vulnerable part of any HMI in transit. Wrap the display face in bubble wrap or foam and use a rigid box with padding on all sides so the unit cannot shift or take a direct impact on the screen. Avoid packing tape directly on the screen surface. Contact us first with the make, model, and fault description and we'll confirm we can help and advise on packaging for your specific unit — we accept units by courier and can arrange collection for larger or heavier panels.
Can you repair an obsolete HMI that is no longer manufactured?
Yes. Obsolete HMI repair is one of our specialisms. When the OEM has discontinued the product, repair is often the only option that does not require replacing the entire machine control system. We use ABI BoardMaster diagnostics to work without original schematics and source equivalent components for older hardware.
Can you repair a cracked HMI touchscreen?
It depends on the nature of the damage and the specific unit. In some cases, the display panel can be replaced as part of the repair. In others, physical cracking has caused internal damage to the control boards as well. We assess each unit individually and advise whether repair is viable and cost-effective before any work begins.
Is it worth repairing an old HMI rather than buying a new one?
In most cases, yes — particularly where replacing the HMI would also require reprogramming, rewriting screen graphics, or modifying the machine control system to accommodate a different product. Repair preserves the original software and machine settings. The cost of repair is typically 20–40% of a new equivalent where one exists, and often the only option where it does not.
Do you offer a warranty on HMI repairs?
All repaired HMIs carry a minimum 6-month warranty as standard. Extended warranty up to 24 months is available — customers can choose the level of cover that suits their needs and budget. Warranty terms are confirmed in writing with your quotation.
Can you repair an HMI on-site if it is built into the machine?
In some cases, yes. Contact us to discuss your situation. Many HMIs can be removed and sent for bench repair, but where this is not practical we can advise on on-site options or temporary solutions to keep the machine operational while the repair is carried out.