iMac Power Supply Repair
iMac Power Supply RepairJohannesburg & Gauteng
Press the power button, get nothing. Or a flash, a click, and silence. On most iMacs that's the internal PSU — and on iMacs that means specialist replacement, not a quick swap. We diagnose at component level, source the right unit, get you back up. Free diagnostic.
Free diagnostic · Component repair from R1,200 · Full PSU replacement from R3,800 · 6-month warranty
iMac power faults we repair
iMac completely dead — no response
No fan, no chime, no display. Usually a blown PSU, failed power rail capacitor, or surge damage. Fully diagnosable and repairable in most cases.
iMac powers on then immediately shuts off
Machine starts briefly — fan spins, drive spins — then cuts out within seconds. Failing PSU unable to sustain load.
Load-shedding or power surge damage
One of the most common iMac faults in SA. Surge on power restoration damages PSU capacitors and board-level power ICs.
Intermittent power — starts sometimes, not others
Works some days, dead others. Failing capacitor or transistor that recovers when cold. Worsens over time.
Unexpected shutdowns during use
iMac cuts out randomly during operation. Can indicate failing PSU, overheating, or power management IC fault on logic board.
No power after lightning strike
Nearby lightning can surge through power lines and damage the PSU and logic board simultaneously. Full diagnosis required.
iMac powers on but no display
Separate fault from power supply — likely display, backlight, or GPU. We diagnose and route to correct repair.
Clicking or popping noise on power attempt
Audible pop when pressing power button with no startup — common sign of a blown capacitor in the PSU.
iMac power supply repair price guide
Estimates only. Final price confirmed after free diagnostic. Written quote before any work begins.
| Service | Estimate |
|---|---|
| Component-level PSU repair (capacitor / rectifier / fuse) Fault isolated to a failed component inside the PSU — replaced under microscope. Board stays in machine. |
R1,200 – R1,800 |
| Full PSU replacement — iMac 21.5-inch (185W, A1418) PSU unit: R2,500 + display removal labour + OEM adhesive strips. Covers all 21.5-inch models 2013–2017. |
R3,800 – R4,200 |
| Full PSU replacement — iMac 27-inch (300W, A1419) PSU unit: R2,999 + display removal labour + OEM adhesive strips. Covers all 27-inch models 2013–2017. |
R4,500 – R5,000 |
| Logic board power rail repair Power fault traced to board-level capacitor, transistor, or power management IC. Component-level microsoldering. |
R1,800 – R3,200 |
| Load-shedding surge damage — full assessment PSU and logic board both tested. Written scope before work begins. Often component-level — rarely requires full PSU swap. |
From R1,200 |
| Collection and return — Gauteng Door-to-door via Eliz Courier. Insured. |
R500 |
PSU internal failure modes & SMC diagnostics
LiteOn & Delta PSU — common internal failure patterns
- Primary capacitor failure: The large electrolytic capacitors on the primary side of the PSU (typically 400V, 100–220µF) fail after years of thermal cycling and load-shedding stress. Symptoms: iMac dead or intermittent. These are replaceable at component level.
- Shorted bridge rectifier: The bridge rectifier converts AC from the wall to DC. Load-shedding surges can blow the rectifier instantly. Identified via continuity testing; replaced without full PSU swap in most cases.
- Secondary rail capacitor bulging: Lower-voltage output capacitors (5V, 12V rails) bulge and leak after extended high-temperature operation. Visible inspection confirms; replaced with equivalent-spec capacitors.
- Logic board safe-mode cutoff: The logic board monitors PSU output voltages and cuts power if rails deviate more than ±5%. A PSU delivering 11.4V on the 12V rail causes the board to shut down protectively — appearing as a dead iMac even though the logic board is healthy.
- Blown primary fuse: A surge can blow the glass fuse on the PSU primary input. A simple and inexpensive fix — but must be investigated to confirm the fuse didn't blow due to a downstream short on the logic board.
Try an SMC reset before assuming the worst
- The System Management Controller (SMC) manages power, fans, and startup on Intel iMacs. A hung SMC can prevent startup even when all hardware is healthy.
- Intel iMac SMC reset: Shut down → unplug power cable → wait 15 seconds → plug back in → wait 5 seconds → press power button. This resets the SMC without losing any data.
- If the iMac starts after an SMC reset, the hardware is fine and the fault was an SMC state corruption — common after power interruptions.
- If the iMac remains completely unresponsive after an SMC reset with a known-good power outlet, the fault is hardware — bring it in for a free diagnostic.
- Apple Silicon (M1/M3/M4): There is no SMC — power management is handled by the secure enclave. Simply hold the power button for 10 seconds to force a shutdown, then restart normally.
Which iMac do you have?
Jump to your exact model for model-specific pricing, parts, and known faults.
iMac 24-inch M-series
View M-series repairs → 2017 XeoniMac Pro
View Pro repairs → 2019 - 2020iMac 27-inch (late Intel)
View 27" late Intel repairs → 2015 - 2017iMac 27-inch 5K
View 27" 5K repairs → 2013 - 2014iMac 27-inch
View 27" early repairs → 2017 - 2019iMac 21.5-inch 4K
View 21.5" 4K repairs → 2013 - 2015iMac 21.5-inch
View 21.5" early repairs →iMac power supply repair process
Free diagnostic
We test the PSU output voltages, inspect the logic board power rail, and identify whether the fault is in the PSU, board capacitors, or power management IC.
Written fixed-price quote
Exact fault identified and repair cost confirmed in writing. You decide whether to proceed.
Component-level repair
Faulty capacitor, IC, or transistor replaced under microscope. Full PSU replaced only when the unit cannot be repaired at component level.
Power test + stability check
iMac powered on and monitored under load for stability. Fan response, temperature sensors, and power rail voltages verified.
6-month warranty
Written warranty on the repaired component. If the same fault reoccurs within 6 months, we fix it at no charge.
Collection or return
Pick up from our Silvamonte workshop or we arrange insured return across Gauteng.
Three ways to get your iMac to us
Drop it off, arrange Gauteng collection, or ship from anywhere in South Africa. iMacs are heavy and the displays are fragile — we transport them properly.
Drop it off at the workshop
Walk in to our Silvamonte workshop any business day. Free parking, free diagnostic on the spot. Bring the original box if you still have it — otherwise we have appropriate transport packaging on hand.
11 Swemmer Rd, Silvamonte, Johannesburg
Mon-Fri 08:00-17:30 · Sat 08:00-14:00
Door-to-door via Eliz Courier
Eliz Courier & Messenger Services collects and returns your iMac across Joburg, Pretoria, Centurion, and the East Rand. R500 round-trip — slightly higher than our laptop rate because iMacs need specialist transport packaging and careful handling.
WhatsApp to book collection →Ship via The Courier Guy
Anywhere in South Africa — Cape Town, Durban, PE, Bloem, Polokwane. We arrange Courier Guy collection from your door with proper iMac packaging, repair, and return. Pricing depends on size; WhatsApp us with your model.
WhatsApp to arrange courier →Service areas across Gauteng
iAssist Repair serves the entire Gauteng province. Collection and delivery across Johannesburg and Pretoria (R500 for iMacs). If your area isn't listed, contact us.
Find Your Service Area
Start typing your suburb to filter the areas below
Johannesburg & Pretoria Service Areas
Click to expand service areas. Tap any suburb for local collection details & pricing.
Johannesburg Central & Parks Click to expand
Sandton & Surrounding Suburbs Click to expand
Randburg & Northcliff Click to expand
Fourways & Midrand Click to expand
Roodepoort & West Rand Click to expand
Johannesburg South & Alberton Click to expand
Bedfordview & Edenvale Click to expand
East Rand (Ekurhuleni) Click to expand
Centurion Click to expand
Pretoria Click to expand
Apple repair by province — nationwide courier
Outside Gauteng? We collect and return your iMac nationwide via secure courier.
iMac power supply repair — FAQ
My iMac won't turn on at all — is that the power supply?
A completely dead iMac is most commonly caused by a failed power supply unit, a blown capacitor on the logic board power rail, or surge damage from load-shedding. Our technicians run a full board-level diagnostic to isolate whether the fault is in the PSU itself or on the logic board power circuit before quoting any repair.
Can load-shedding damage an iMac power supply?
Yes — and this is one of the most common iMac faults we see in South Africa. Power surges when Eskom restores supply, as well as the cumulative effect of repeated on-off cycles, can damage power supply capacitors and board-level power ICs. A surge protector or UPS significantly reduces this risk. If your iMac died around a load-shedding event, a power supply fault is the most likely cause.
How much does iMac power supply repair cost?
Component-level power supply repair starts from R1,200. Full PSU unit replacement ranges from R3,800 (21.5-inch) to R5,000 (27-inch) depending on model, as the PSU unit alone costs R2,500–R2,999 before labour and adhesive strips depending on the fault location and model. If the fault is in the external PSU unit itself it is typically lower cost. If the power fault is traced to the logic board it may involve component-level IC replacement. A free diagnostic confirms the exact fault before any quote is issued.
My iMac powers on briefly then shuts off — is that the power supply?
This is a classic sign of a failing power supply unable to sustain load under operation. It can also indicate a failing capacitor on the logic board power rail. Our diagnostic distinguishes between these faults clearly before any work begins.
My iMac turns on sometimes but not others — what is wrong?
Intermittent power faults — where the iMac powers on some days but not others — usually point to a capacitor or transistor failing under temperature cycling. As the component heats up it fails; when cold it recovers temporarily. This is a component-level fault that worsens over time and should be addressed before it becomes a permanent no-power situation.
Will my data be safe during a power supply repair?
Yes. Power supply repair does not involve the storage drive in any way. Your data is completely safe throughout the repair process.
How long does iMac power supply repair take?
Diagnostic is completed same day. Most power supply repairs are completed within 1 to 3 business days depending on parts availability. We give you a clear timeline upfront.
Do you offer collection for iMac power supply repair?
Yes — R500 door-to-door collection and return across Gauteng via Eliz Courier. WhatsApp us on 078 742 4769 to arrange pickup from your door.
Visit Our Repair Centre
iAssist Repair– Johannesburg
Shop 4, Silvercrest Centre
11 Swemmer Rd, Silvamonte, Johannesburg
Prefer convenience?
We offer collection & delivery across Johannesburg.
Blog posts
View all-
The Second-Hand iPhone Scam: What We Find Inside
Thinking of buying a used iPhone? Learn how to spot hidden problems, avoid costly scams, and find out what technicians uncover after the screen comes off.
The Second-Hand iPhone Scam: What We Find Inside
Thinking of buying a used iPhone? Learn how to spot hidden problems, avoid costly scams, and find out what technicians uncover after the screen comes off.
-
Black screen of death? How we rescue files from...
Dead MacBook? Your files may still be recoverable. Learn what causes black screens, logic board failure, and how professional data recovery works.
Black screen of death? How we rescue files from...
Dead MacBook? Your files may still be recoverable. Learn what causes black screens, logic board failure, and how professional data recovery works.
-
iPhone Battery Health Tips That Make Sense in S...
Struggling with iPhone battery health dropping? This guide breaks down how load shedding, charging habits and everyday use affect your battery, plus what actually helps in real South African conditions.
iPhone Battery Health Tips That Make Sense in S...
Struggling with iPhone battery health dropping? This guide breaks down how load shedding, charging habits and everyday use affect your battery, plus what actually helps in real South African conditions.
