SMPS POWER SUPPLY BOARD REPAIR, DIAGNOSTICS, REPLACEMENT AND SERVICING IN NAIROBI, KENYA

A switch-mode power supply, (call 0723763173) commonly known as an SMPS, is one of the most important sections of modern electronic equipment. It converts electrical power from the incoming supply into the regulated DC voltages required by electronic circuits. Televisions, audio systems, monitors, industrial equipment, appliances, LED systems, computers, control equipment and many other electronic devices depend on properly functioning power supply circuits.

When an SMPS develops a fault, the entire equipment may stop working even though the rest of the electronic circuits are still functional. Some faults may cause complete loss of power, while others can result in intermittent operation, repeated restarting, clicking sounds, standby problems, overheating, blown fuses or unstable output voltages.

Pro-Logic Technologies Limited provides professional SMPS power supply board repair, testing, component replacement, troubleshooting and replacement services in Nairobi and across Kenya.

Our technicians work with electronic power supply boards at component level and can diagnose many faults involving primary-side and secondary-side circuits.

📞 CONTACT: 0723763173
📧 EMAIL: info@prologictechnologies.co.ke
🌐 WEBSITE: prologictecnologies.co.ke
📍 WORKSHOP: Luthuli Avenue, Kangari Building, 3rd Floor, KA7, Nairobi, Kenya

WHAT IS AN SMPS POWER SUPPLY?

An SMPS is an electronic power conversion circuit designed to convert electrical energy efficiently from one voltage level to another.

Unlike traditional linear power supplies that may use large transformers operating directly at mains frequency, an SMPS normally uses high-frequency switching circuitry. The incoming electrical supply is rectified, filtered, switched at high frequency and transferred through a high-frequency transformer or switching network before being rectified and regulated on the output side.

This arrangement allows manufacturers to design power supplies that are generally smaller, lighter and more efficient than equivalent conventional supplies.

The board shown in the supplied image is a substantial switching power supply assembly containing components such as:

Power transformers
High-voltage capacitors
Power switching devices
Aluminium heatsinks
Inductors
Filtering components
Rectification circuitry
Electrolytic capacitors
Resistors
Protection components
Secondary rectification components
Output filtering circuitry
Connectors
Control circuitry

Because an SMPS operates with potentially dangerous mains voltages and high-energy capacitors, proper diagnosis requires appropriate electronic test equipment and qualified handling.

SMPS POWER SUPPLY BOARD REPAIR IN NAIROBI

If your electronic equipment has suddenly stopped powering on, the problem may originate from the power supply board.

A defective SMPS can produce different symptoms depending on the failed component and the section of the circuit affected.

At Pro-Logic Technologies Limited, we inspect the power supply systematically instead of replacing components randomly.

Our diagnostic process may include:

Visual inspection
Fuse testing
Short-circuit testing
Primary-side testing
Secondary-side testing
Capacitor testing
MOSFET testing
Diode testing
Rectifier testing
Resistance measurements
Voltage measurements
Startup circuit testing
Feedback circuit testing
Output voltage testing
Load testing
Component-level troubleshooting

The objective is to establish the actual cause of the failure before recommending repair or board replacement.

COMMON SMPS POWER SUPPLY FAULTS

1. SMPS COMPLETELY DEAD

One of the most common complaints is that the equipment does not power on at all.

A dead power supply may have a fault in the:

Input fuse
Bridge rectifier
MOSFET
Startup circuit
PWM controller
Switching transformer
Primary capacitor
Protection circuit
Secondary rectifier
Feedback circuit
PCB tracks
Power input section

A technician must determine whether the failure is on the primary side or secondary side before replacing parts.

2. BLOWN SMPS FUSE

A repeatedly blown fuse is usually an indication of a deeper fault.

The fuse itself may be functioning correctly by opening the circuit when excessive current is detected.

Possible causes include:

Shorted MOSFET
Shorted bridge rectifier
Shorted primary capacitor
Shorted snubber component
Damaged switching controller
Secondary-side short
Surge damage
Lightning-related damage
Component failure
PCB insulation failure

Simply replacing the fuse without investigating the underlying fault can result in another immediate failure.

3. FAILED POWER MOSFET

Power MOSFETs are commonly used as switching devices in SMPS circuits.

A failed MOSFET can cause:

Blown input fuse
Complete power failure
Short circuit
Burnt components
Damaged gate resistor
Failure of the PWM controller
Repeated fuse failure

MOSFET testing should be performed carefully because surrounding components can influence resistance measurements.

A complete repair may require inspection of the MOSFET's associated gate-drive, snubber and protection circuitry.

4. BAD ELECTROLYTIC CAPACITORS

Electrolytic capacitors are critical components in both primary and secondary sections of an SMPS.

A capacitor can deteriorate because of:

Age
Heat
Excessive ripple current
Poor ventilation
Electrical stress
Incorrect voltage
Component degradation

A capacitor may sometimes appear normal externally while having high ESR or reduced capacitance.

For this reason, professional diagnosis may require capacitance and ESR testing rather than relying only on visual inspection.

5. NO STANDBY VOLTAGE

Some electronic equipment has a standby power supply that remains active even when the main equipment appears to be switched off.

If the standby circuit fails, the equipment may show:

No standby light
No response from remote control
No response from the power button
No startup
No communication with the main board

The standby supply must be tested before assuming that the main control board is defective.

6. REPEATED RESTARTING

An SMPS may start and then shut down repeatedly.

This can happen when:

Output voltage is unstable
Secondary circuit is overloaded
Feedback circuit is faulty
Capacitors have deteriorated
Protection circuitry activates
A downstream circuit is shorted
Transformer or switching components are defective

The visible symptom may appear to be a problem with the main equipment, while the actual fault is located inside the power supply.

7. CLICKING OR TICKING SOUND

A clicking or ticking noise from an electronic device can sometimes originate from an SMPS entering a protection or restart cycle.

The switching circuit may attempt to start, detect an abnormal condition and shut down, then attempt to restart.

Possible causes include:

Secondary short circuit
Bad capacitor
Overload
Failed rectifier
Feedback fault
Damaged switching component
Transformer problem

The sound itself is not enough to identify the failed component. Electrical testing is required.

8. OVERHEATING POWER SUPPLY

Excessive heating can indicate an electrical or thermal problem.

Common causes include:

Overloaded circuit
Failed cooling system
High ESR capacitors
Incorrect load
Shorted semiconductor
Poor ventilation
Excessive switching losses
Deteriorated components
Incorrect replacement component

A component operating above its intended temperature can eventually cause additional failures.

PRIMARY SIDE AND SECONDARY SIDE OF AN SMPS

Understanding the difference between the primary and secondary sides is important during troubleshooting.

The primary side is associated with the incoming mains supply and high-voltage DC section.

It may include:

Input fuse
Surge protection
EMI filter
Bridge rectifier
High-voltage capacitor
Switching MOSFET
PWM controller
Startup components
Primary transformer winding
Snubber network

The secondary side is associated with the lower-voltage output section.

It may include:

Secondary transformer windings
Rectifier diodes
Schottky diodes
Synchronous rectifiers
Output capacitors
Inductors
Feedback circuits
Voltage regulation circuits
Output connectors

These sections require different diagnostic approaches.

SMPS COMPONENT REPLACEMENT SERVICES

We provide component-level replacement where the condition of the PCB makes repair practical.

Components that may be replaced include:

MOSFETs
Diodes
Rectifier bridges
Electrolytic capacitors
Ceramic capacitors
Film capacitors
Resistors
Fusible resistors
Thermistors
Varistors
PWM controllers
Optocouplers
Regulators
Transistors
Switching components
Inductors
Protection components
Secondary rectifiers

The replacement component must be electrically suitable for the circuit.

SMPS BOARD REPLACEMENT

Not every power supply board should be repaired at component level.

Where a board is severely damaged, replacement may be more practical.

A replacement board should be matched according to relevant identification information such as:

Board number
Part number
Revision
Output specifications
Connector configuration
Equipment model
Electrical ratings
Physical dimensions

Using a visually similar board without confirming compatibility can damage the connected equipment.

TELEVISION SMPS POWER SUPPLY REPAIR

Modern televisions use sophisticated power supply systems to provide the different voltages required by the television.

An SMPS may provide power for:

Main board
Backlight system
Audio amplifier
T-Con-related circuits
Standby circuit
Control circuits
LED driver section

A faulty television power supply may cause a completely dead television or may allow standby operation while preventing full startup.

We provide television power supply diagnosis and repair for various brands and models.

LED TV POWER SUPPLY REPAIR

LED televisions depend on regulated power supplies.

A power supply failure can present as:

No power
Standby only
TV switching off
TV restarting
Backlight problems
Clicking noise
Blown fuse
Burning smell
Intermittent operation

A proper diagnosis distinguishes between an SMPS fault and faults in the main board or LED backlight system.

QLED AND OLED EQUIPMENT POWER SUPPLY

Advanced television technologies also use dedicated power management systems.

When a television does not start, the power supply should be tested alongside the control and display-related circuits.

A technician should avoid automatically condemning an expensive panel or main board before confirming the power rails.

AUDIO EQUIPMENT SMPS REPAIR

Many modern sound systems use switching power supplies.

These include:

Home theatres
Soundbars
Amplifiers
Hi-Fi systems
Powered speakers
Professional audio equipment
Subwoofers
DJ equipment

An SMPS fault can cause the entire audio system to become inactive or may cause protection-mode operation.

We can inspect the power supply and associated circuits to establish whether repair or replacement is appropriate.

INDUSTRIAL SMPS REPAIR

Industrial electronics often depend on stable DC power.

A faulty industrial power supply can affect:

Control systems
Sensors
Relays
PLC equipment
Automation systems
Displays
Communication equipment
Motor controllers
Control panels

Unstable power can create secondary faults in sensitive electronic equipment.

For industrial applications, the diagnosis should consider both the power supply and the load connected to it.

WHY SMPS BOARDS FAIL

There is rarely one universal reason for SMPS failure.

Common causes include:

Electrical surges

Power surges can damage semiconductor components and protection devices.

Lightning

Lightning-related electrical events can cause extensive damage to electronic power supplies.

Heat

High operating temperatures accelerate component deterioration.

Age

Older capacitors and semiconductor components may eventually fail.

Overloading

A power supply operating beyond its designed load can overheat or enter protection mode.

Poor ventilation

Insufficient airflow increases internal temperature.

Component degradation

Capacitors, resistors and semiconductor components can change characteristics over time.

Downstream short circuits

A short circuit elsewhere in the equipment can overload the power supply.

SMPS DIAGNOSTIC PROCESS

Our technicians can follow a structured diagnostic procedure.

Step 1: Visual Inspection

The board is inspected for:

Burn marks
Cracked components
Swollen capacitors
Leakage
Discoloured PCB areas
Damaged connectors
Broken tracks
Burnt resistors
Mechanical damage

Step 2: Fuse and Input Inspection

The incoming power path is checked.

Step 3: Short-Circuit Testing

Potential shorts are identified before applying power where appropriate.

Step 4: Primary Circuit Testing

The primary switching section is inspected.

Step 5: Secondary Circuit Testing

Output rectifiers and filtering circuits are checked.

Step 6: Control Circuit Testing

PWM and feedback circuits are evaluated.

Step 7: Output Voltage Verification

The expected output rails are measured.

Step 8: Load Testing

The supply may be evaluated under an appropriate load.

Step 9: Final Inspection

After repair, the board is inspected and tested before installation.

WHY PROFESSIONAL SMPS REPAIR MATTERS

An SMPS is not simply a collection of components that can be replaced randomly.

The circuit operates as an interconnected system.

For example, replacing a failed MOSFET without checking why it failed can result in another failure.

Similarly, replacing a blown fuse without checking the switching section can cause the new fuse to fail immediately.

Professional diagnosis therefore focuses on the cause of failure, not merely the component that appears damaged.

SMPS SAFETY

SMPS boards can contain dangerous voltages.

The large electrolytic capacitors on the primary side may retain electrical energy even after the equipment has been disconnected from the mains.

For this reason, customers should avoid opening or probing the board without appropriate technical knowledge and equipment.

Professional technicians use suitable measurement instruments and safe procedures when handling high-voltage power supply circuits.

SMPS REPAIR FOR BUSINESSES AND INSTITUTIONS

Businesses that depend on electronic equipment can experience operational interruptions when power supplies fail.

We can assist with power supply diagnosis for suitable equipment used in:

Offices
Shops
Hotels
Schools
Workshops
Restaurants
Entertainment facilities
Industrial premises
Commercial installations
Service centres

Where practical, power supply repair can help restore equipment without replacing the entire electronic system.

POWER SUPPLY BOARD TESTING

Testing is an important part of the repair process.

A technician may use equipment such as:

Digital multimeter
ESR meter
Oscilloscope
Component tester
Insulation testing equipment
Current-limited power source
Electronic load
Soldering and rework equipment

The exact instruments used depend on the design and fault condition of the board.

SMPS PCB REPAIR

Printed circuit boards can also suffer physical damage.

Examples include:

Burnt tracks
Cracked solder joints
Broken connectors
Lifted pads
Carbonized PCB areas
Corrosion
Heat-damaged areas

Where technically feasible, damaged tracks and solder connections can be restored.

Severely carbonized or structurally damaged PCBs may require board replacement instead.

SMPS CAPACITOR REPLACEMENT

Capacitor replacement is one of the common operations performed during power supply repair.

The replacement must take into account:

Capacitance
Voltage rating
Temperature rating
Polarity
Physical size
Ripple-current capability
ESR characteristics

Using an unsuitable capacitor can lead to premature failure.

SMPS MOSFET REPLACEMENT

MOSFET replacement requires careful selection.

Important characteristics can include:

Drain-source voltage rating
Current rating
RDS(on)
Gate characteristics
Switching speed
Package
Thermal requirements

The correct replacement should be selected according to the circuit requirements rather than simply choosing a component with a similar physical appearance.

SMPS DIODE AND RECTIFIER REPAIR

Rectifier components convert switching waveforms into usable DC output.

A failed rectifier may produce:

Short circuit
Low output voltage
Excessive ripple
Overheating
Power supply shutdown

Both primary and secondary rectification stages should be considered during diagnosis.

SMPS TRANSFORMER PROBLEMS

The transformers visible on many switching power supplies are high-frequency transformers.

They provide energy transfer and electrical isolation between sections of the circuit where applicable.

Transformer-related problems may include:

Winding damage
Overheating
Shorted turns
Physical damage
Insulation problems
Mechanical noise

Transformer faults require specialized testing and should not be confused with faults in surrounding components.

SMPS INDUCTORS AND FILTERING COMPONENTS

Inductors and coils are used extensively in power supplies.

They may perform functions such as:

EMI filtering
Energy storage
Output filtering
Noise reduction
Current smoothing

A damaged inductor can affect output stability and power supply performance.

SMPS FEEDBACK CIRCUIT

Feedback is fundamental to regulated switching power supplies.

The feedback system monitors output conditions and communicates information to the control circuitry so that the switching stage can regulate output voltage.

Components such as:

Optocouplers
Reference devices
Resistors
Transistors
Control ICs

may form part of this feedback system.

A feedback fault can cause abnormal output voltage or repeated shutdown.

SMPS STARTUP CIRCUIT

The startup circuit provides the initial operating conditions required for the switching controller.

A fault in this section may result in:

No switching
No startup
Intermittent startup
Repeated attempts to start

Startup components therefore deserve attention when an SMPS is completely dead but does not exhibit an obvious short circuit.

SMPS PROTECTION CIRCUITS

Modern power supplies commonly incorporate protection functions.

These can include protection against:

Overcurrent
Overvoltage
Short circuit
Excessive temperature
Abnormal operating conditions

When protection activates, the power supply may shut down rather than continue operating under dangerous conditions.

SMPS POWER SUPPLY BOARD SERVICE IN NAIROBI CBD

Our workshop is located at:

Luthuli Avenue, Kangari Building, 3rd Floor, KA7, Nairobi.

Customers looking for electronic power supply repair services in Nairobi CBD can contact us before bringing a board or equipment for assessment.

We handle suitable repair work involving electronic power supply boards and related electronic equipment.

SMPS REPAIR SERVICES ACROSS KENYA

Although our main workshop is in Nairobi, we also serve customers requiring electronic repair services from different parts of Kenya.

Customers outside Nairobi can contact us to discuss:

Board diagnosis
Repair requirements
Replacement boards
Spare components
Delivery arrangements
Equipment assessment

Where possible, customers can provide clear photographs of the board, including the front, back, labels, part numbers and connectors, before arranging service.

WHAT INFORMATION SHOULD YOU PROVIDE WHEN REQUESTING SMPS REPAIR?

For faster assessment, provide:

Equipment brand
Equipment model
Board number
Clear photographs
Description of the fault
Whether the equipment has standby power
Whether the fuse is blown
Whether the equipment recently experienced a power surge
Whether there was smoke or burning
Any previous repair history

This information helps the technician understand the equipment before physical inspection.

SMPS BOARD IDENTIFICATION

Correct identification is essential when sourcing replacement boards.

A board can have multiple numbers, including:

PCB number
Assembly number
Manufacturer number
Revision number
Model number
Barcode
Production code

A photograph alone may not always be sufficient for identifying an exact replacement.

REPAIR OR REPLACE THE SMPS?

The best option depends on the condition of the board.

Repair may be appropriate when:

The PCB is structurally sound
Components are available
The fault is identifiable
Repair is economically sensible
The transformer and major components remain serviceable

Replacement may be preferable when:

The PCB is severely burned
Multiple sections are damaged
Critical components are unavailable
The board is extensively corroded
Repair would be uneconomical

The final recommendation should be based on actual inspection.

SMPS POWER SUPPLY MAINTENANCE

Preventive maintenance can reduce unexpected failures in equipment that operates continuously.

Maintenance may include:

Checking ventilation
Cleaning accumulated dust
Inspecting cooling systems
Checking connectors
Monitoring unusual heating
Inspecting capacitors
Checking output stability
Investigating unusual sounds
Checking for signs of overheating

Equipment operating in dusty environments may require more frequent inspection.

DUST AND SMPS FAILURE

Dust accumulation can contribute to overheating by restricting airflow and insulating heat-producing components.

Power supplies with heatsinks and cooling fans can be particularly affected by dust.

Keeping electronic equipment clean and properly ventilated can help maintain normal operating temperatures.

POWER SURGE DAMAGE

Electrical surges can cause significant damage to power supply circuits.

Protection components are intended to reduce the effect of abnormal electrical conditions, but severe events can exceed their protection capability.

After a major power event, a device that appears completely dead should be diagnosed rather than repeatedly powered on.

LIGHTNING DAMAGE TO POWER SUPPLIES

Lightning-related damage can affect multiple sections of an electronic device.

Depending on the path of the electrical event, damage may occur to:

Input protection
Rectifiers
Switching components
Controllers
Transformers
Secondary circuits
Main boards

A complete inspection may therefore be necessary after severe electrical events.

SMPS POWER SUPPLY FOR HOME ELECTRONICS

Home electronics increasingly depend on switching power supplies.

These include:

Televisions
Sound systems
Monitors
Decoders
Receivers
Appliances
LED equipment
Chargers
Networking equipment
Entertainment systems

A power supply fault can make otherwise functional equipment unusable.

ELECTRONIC POWER SUPPLY SPARE PARTS

Depending on availability, we can assist with sourcing or supplying suitable electronic components and replacement boards.

Common components include:

Capacitors
Resistors
Diodes
MOSFETs
Transistors
Controllers
Optocouplers
Rectifiers
Inductors
Transformers
Fuses
Thermistors
Varistors

Component availability varies according to model and specification.

SMPS REPAIR FOR TECHNICIANS AND SERVICE CENTRES

We can also handle suitable board-level repair requirements brought by technicians and service providers.

A technician may bring a board requiring:

Fault diagnosis
Component replacement
Short-circuit tracing
PCB repair
Testing
Power supply restoration
Board evaluation

The board should be accompanied by its equipment model and fault description whenever possible.

WHY CHOOSE PRO-LOGIC TECHNOLOGIES LIMITED?

We focus on practical electronic diagnosis rather than unnecessary replacement.

Our service approach emphasizes:

Technical inspection
Component-level diagnosis
Fault identification
Proper component selection
Electrical testing
Board evaluation
Repair where practical
Replacement where appropriate
Clear communication with customers

Our objective is to restore equipment safely and reliably where repair is technically and economically viable.

SMPS POWER SUPPLY REPAIR QUESTIONS

Can every SMPS board be repaired?

No. Some boards are too extensively damaged or have components that are no longer economically available. The board must be inspected.

Can a blown fuse simply be replaced?

A fuse should not automatically be replaced without investigating why it opened.

Why does an SMPS keep restarting?

Possible causes include overload, short circuit, defective capacitors, feedback faults, protection activation or secondary-side problems.

Can you replace individual SMPS components?

Yes, component-level repair may be possible depending on the board and fault.

Do you repair television power supply boards?

Yes. Suitable television SMPS boards can be diagnosed and repaired or replaced.

Do you sell replacement power supply boards?

Replacement availability depends on the exact board number, equipment model and market availability.

Can I send a photograph first?

Yes. Clear photographs of the board and its identification labels can help with preliminary assessment.

CONTACT PRO-LOGIC TECHNOLOGIES LIMITED

For SMPS power supply board repair, testing, troubleshooting, component replacement and replacement board enquiries, contact our technical team.

CONTACT INFORMATION

Company: Pro-Logic Technologies Limited
Phone: 0723763173
Email: info@prologictechnologies.co.ke
Website: prologictecnologies.co.ke
Workshop: Luthuli Avenue, Kangari Building, 3rd Floor, KA7, Nairobi, Kenya

Customers requiring service from outside Nairobi can contact us first to discuss the board, equipment model, fault symptoms and available repair options.

SMPS POWER SUPPLY BOARD REPAIR IN NAIROBI AND KENYA

A properly functioning power supply is essential for the reliability of electronic equipment. When an SMPS fails, replacing the entire device may not always be necessary. In many cases, professional diagnosis can identify the defective component or circuit section and determine whether the board can be restored.

From power MOSFETs and rectifiers to capacitors, transformers, inductors, PWM controllers and feedback circuits, an SMPS contains numerous interconnected stages. Proper diagnosis therefore requires understanding the complete power conversion process.

At Pro-Logic Technologies Limited, we provide technical assessment of suitable SMPS boards and electronic power supply systems. Our workshop at Luthuli Avenue, Kangari Building, 3rd Floor, KA7, Nairobi provides a point where customers can bring boards and equipment for assessment.

For enquiries, call 0723763173, email info@prologictechnologies.co.ke, or visit prologictecnologies.co.ke.

Pro-Logic Technologies Limited — SMPS POWER SUPPLY BOARD DIAGNOSTICS, REPAIR, COMPONENT REPLACEMENT AND ELECTRONIC POWER SUPPLY SERVICES IN NAIROBI, KENYA.