Industrial Electronic Repair — Newcastle Upon Tyne
Industrial Power Supply Repair
Switch mode, linear, UPS and obsolete PSUs repaired to component level — not board-swapped. All faults diagnosed, capacitors upgraded, and every unit fully tested before return. Based in Newcastle, serving industry across the UK.
SMPS Repair
Linear PSU Repair
UPS Repair
Obsolete PSU Specialists
24V & 48V DC Rail Supplies
Component-Level Diagnosis
Power supply failure causing production downtime? Call us now — fast turnaround available for critical industrial PSUs.
0800 001 6045
What is an industrial power supply repair? An industrial PSU repair is the process of diagnosing and restoring a faulty switch mode, linear or uninterruptible power supply at component level. Rather than replacing the entire unit — often at significant cost — our engineers identify the root cause, replace failed components such as capacitors, MOSFETs, rectifiers and control ICs, then fully test the unit under load before returning it. NPE repairs PSUs from all major manufacturers, including obsolete models that are no longer available to buy new.
Power Supply Types We Repair
We repair all types of industrial power supply — whether you have a modern switch mode unit, an older linear supply, or an obsolete PSU with no replacement available.
Switch Mode Power Supplies (SMPS)
The most common type in industrial automation. We repair all SMPS faults including control IC failure, MOSFET breakdown, capacitor failure and output regulation issues.
Linear Power Supplies
Older but still widely used in legacy industrial systems. We restore linear regulators, transformer-based units and rectifier assemblies to full specification.
Uninterruptible Power Supplies (UPS)
UPS units protecting critical plant and SCADA systems. We repair inverter sections, battery management circuits and charging boards — keeping your backup power reliable.
24V & 48V DC Rail Supplies
DC rail power supplies used across PLCs, sensors, actuators and control panels. We repair single-output and multi-output 24V and 48V DC units of all makes and ratings.
High Voltage Power Supplies
High voltage DC and AC power supplies used in industrial process equipment, testing rigs and specialist machinery. Repaired with full safety testing and verification.
Obsolete & Discontinued PSUs
Can't source a replacement? We specialise in repairing power supplies that are no longer manufactured — diagnosing and restoring units others simply write off.
Common Power Supply Faults We Fix
Industrial power supplies fail for a number of well-understood reasons. Our engineers have seen all of them. Component-level diagnosis means we find the actual cause — not just swap the board.
Electrolytic Capacitor Failure
The most common PSU failure mode. Caps dry out, swell or go resistive over time. We replace and upgrade all electrolytics — from standard 85°C to 105°C long-life types.
MOSFET / Transistor Failure
Power MOSFETs and switching transistors fail due to overvoltage, thermal stress or age. We identify and replace individual devices without board replacement.
Rectifier / Diode Failure
Bridge rectifiers and output diodes can fail short or open. We test and replace rectifier sections as part of every PSU overhaul.
PWM Control IC Failure
The control IC governs switching frequency and regulation. Failure causes erratic output, no output or excessive noise. We source and fit exact replacements.
Output Voltage Drift
Output voltage drifts out of tolerance, causing downstream control system faults. We recalibrate and restore regulation to full specification.
Overcurrent / Overvoltage Protection Trip
Protection circuits that latch off and refuse to restart. We diagnose whether it is a genuine fault or a failed protection device and repair accordingly.
Thermal Shutdown / Overheating
Blocked heatsinks, failed fans or thermal compound breakdown cause thermal shutdown. We clean, repair or replace cooling systems as part of every refurbishment.
Fan Failure
Cooling fans seize, causing overtemperature faults. We replace fans during every repair — not just when asked — to prevent early return.
Transformer Breakdown
Insulation breakdown, winding failure or inter-turn shorts in mains or HF transformers. We wind and source replacements where necessary.
Inrush Limiter / Fuse Failure
NTC thermistors and input fuses blown by upstream events. Replaced as part of root-cause repair — not just as a quick-start fix.
Repairing Obsolete Power Supplies — No Replacement Required
Many industrial plants still rely on power supplies that were made obsolete by the manufacturer years — sometimes decades — ago. When no spare exists and delivery lead times stretch to months, the only practical option is repair.
Northern Power Electronics has repaired PSUs from systems built in the 1980s and 1990s. Our engineers understand legacy designs — from linear regulators with long-discontinued ICs to early switch mode topologies that most repair shops will not touch. We source equivalent components, adapt where necessary, and return the unit fully tested.
If you have been told a power supply is beyond economic repair or "not repairable," speak to us. We regularly fix units that others have written off.
What Happens During a Power Supply Repair at NPE
We do not just repair the reported fault and return the unit. Every PSU that comes through our workshop goes through a full refurbishment process — because returning a unit that fails again six months later is not a repair, it is a delay.
Standard Refurbishment Included with Every PSU Repair
- Full visual inspection and fault diagnosis
- All electrolytic capacitors replaced (upgraded from 85°C to 105°C low-ESR types)
- Cooling fan inspected — replaced if worn or noisy
- Heatsink and thermal interface compound cleaned and renewed
- Rectifiers, MOSFETs and driver ICs tested and replaced where at end-of-life
- Output voltage and regulation verified under load
- Ripple and noise measured and documented
- Protection circuits tested — overcurrent, overvoltage, short circuit
- Full burn-in test before dispatch
- Written repair report included with every unit returned
Our Power Supply Repair Process
1
Send Us Your PSU
Ship your power supply to our Newcastle workshop, or call us to arrange collection. We accept units from anywhere in the UK.
2
Free Assessment
We inspect and diagnose the PSU at no charge. You receive a clear written report of what has failed and what the repair will involve.
3
Written Quotation
We send you a fixed-price quotation before any work begins. No hidden costs. Warranty terms confirmed in writing with every quote.
4
Component-Level Repair
Our engineers repair the PSU at component level using specialist equipment. All worn or near-end-of-life parts are replaced as standard.
5
Full Load Testing
The repaired unit is tested under load and subjected to a full burn-in cycle. Output voltage, regulation, ripple and all protection circuits are verified.
6
Return with Warranty
Your PSU is returned with a minimum 6-month warranty as standard. Extended cover up to 24 months is available — agreed in writing before dispatch.
Power Supply Brands We Repair
We repair power supplies from all major industrial brands, including obsolete and discontinued models. If your make is not listed, call us — we very likely repair it.
Siemens
Schneider Electric
ABB
Allen Bradley
Phoenix Contact
PULS
Murrelektronik
Mean Well
Omron
Beckhoff
TDK-Lambda
Cosel
Bel Power
Vicor
Pilz
Weidmüller
Mitsubishi
Fanuc
Industries We Support
Manufacturing & Production
PSU repair for production lines, assembly machinery and automated systems where downtime directly costs output.
Oil, Gas & Offshore
Power supplies for offshore control systems, subsea equipment and platform instrumentation — reliable repair for demanding environments.
Rail & Transport
PSUs for trackside signalling, rolling stock systems and station infrastructure — repaired to the high reliability standards rail demands.
Pharmaceutical & Life Sciences
Power supplies for clean room equipment, filling lines and validation systems. Quality documentation provided for audit trails.
Water & Utilities
Repairing PSUs in SCADA, telemetry and pump station control systems — critical infrastructure that must stay operational.
Food & Beverage
Power supply repair for processing, packaging and refrigeration control systems. Fast turnaround to minimise production loss.
Why Choose Northern Power Electronics for PSU Repair?
Component-Level Repair
We repair the failed component — we do not swap the board. This means lower cost, faster turnaround and a deeper fix that lasts.
ISO 9001 Quality Management
Every repair follows ISO 9001 certified quality procedures. Written repair reports provided with every unit returned.
6 to 24 Month Warranty
Minimum 6-month warranty as standard on all PSU repairs. Extended cover up to 24 months is available — customers choose the level that suits their needs and budget. All warranty terms confirmed in writing.
Fast Turnaround
Most PSU repairs are completed and returned within a few working days. Urgent and priority repair is available — call us to discuss your timeline.
Full Refurbishment as Standard
Capacitors upgraded, fans replaced, thermal management renewed — included in every repair, not sold as an add-on.
Obsolete Specialists
If your PSU has been discontinued, we can still repair it. We have restored power supplies from systems built decades ago that others refused to touch.
ISO 14001 Environmental Commitment
Repairing extends equipment life and reduces landfill waste. NPE holds ISO 14001 certification — sustainability is part of how we operate.
Related Repair Services
We repair the full range of industrial electronic equipment — not just power supplies.
Frequently Asked Questions — Power Supply Repair
How do I know if my industrial power supply has failed?
Common signs include no output voltage, output voltage that is outside specification, equipment downstream tripping or misbehaving, the PSU running very hot, a burning smell, visible swollen capacitors, or a blown fuse that keeps returning. If your control system is behaving erratically and you have ruled out the PLC or drive, the power supply is a good place to look next.
Is it worth repairing an industrial power supply rather than replacing it?
In most cases, yes. PSU repair typically costs a fraction of replacement — especially for higher-rated units, or where the supply is obsolete and no direct replacement exists. Even for current models, repair is often faster than procurement lead times. We will always give you an honest assessment of whether repair is the right route for your specific unit.
What is the difference between a switch mode and a linear power supply?
A switch mode power supply (SMPS) uses high-frequency switching to convert and regulate voltage — efficient, compact and widely used in modern industrial equipment. A linear power supply uses a transformer and linear regulator — simpler, quieter electrically, but less efficient and typically larger. Both are common in industrial settings and both are repaired at NPE.
Can you repair obsolete power supplies that are no longer manufactured?
Yes. This is one of our core strengths. We regularly repair PSUs from systems that were installed 20 or 30 years ago. We source equivalent components, adapt designs where necessary, and have the diagnostic experience to work with circuits that modern automated test equipment cannot handle. If you have been told a unit is "not repairable," call us before writing it off.
How long does a power supply repair take?
Most PSU repairs are completed within three to five working days once we have the unit in our workshop. Straightforward faults on common units can be faster. For complex or obsolete PSUs, we will give you a realistic timeframe with your quotation. If you have an urgent requirement, let us know — priority turnaround is available.
What warranty do you give on a repaired power supply?
All power supply repairs carry a minimum 6-month warranty as standard. Extended warranty cover up to 24 months is available — customers choose the level that suits their operational needs and budget. Warranty terms are always confirmed in writing with your quotation, before we begin work.
Do you repair three-phase industrial power supplies?
Yes. We repair both single-phase and three-phase industrial power supplies, including high-current rectifier units and multi-output supplies used in heavy industrial applications. Call us with the details of your unit and we will confirm we can help before you send it.
