The standby light is dead, the TV clicks but never starts, or it flashes a blink code at you. Nine times in ten, it's a failed capacitor on the power board - a R660-R1,700 fix in our Gauteng workshop, usually completed in 24 hours.
The power supply unit (PSU) in your television - sometimes called the power board, power-supply board, or in service documentation simply "the PSU" - is the single circuit board that takes 230V AC from your wall socket and converts it to the regulated low-voltage DC rails that everything else inside the TV needs to operate. Typically those rails are 5V for standby, 12V for the main board and 24V or 80V-200V for the backlight inverter. The PSU also contains the standby controller, the soft-start circuit and (on modern TVs) a CPU-controlled power-management system that coordinates with the main board.
The PSU is the part of the TV most exposed to whatever your mains supply throws at it. In a stable-mains country like Germany or Japan, a TV power supply might run for 12-15 years without trouble. In Gauteng - with our load-shedding cycles, the surges that follow power restoration, the lightning events through the summer storm season and the brown-outs that come with strained grid capacity - that same PSU routinely fails at 4-6 years. The bulk electrolytic capacitors are the first to go, followed by the secondary-side MOSFETs that switch the lower-voltage rails.
Across our Gauteng workshop, power-supply repair is the single most common service category we run - typically 30-40 percent of all hardware repairs. It is also one of the most economical: most power-board faults are resolved by replacing 2-4 small components for a total parts cost under R240, with labour bringing the customer-facing price to R660-R1,700. This page explains how PSU repair works, how to decode your TV's blink-code diagnostic, what realistic pricing looks like in Rand, and how to keep your repaired TV running longer.
How a power-supply repair actually moves through our Gauteng workshop.
Bulk capacitors discharged through a calibrated bleeder resistor before anything else. Mains-voltage charge can persist for hours - this is the non-negotiable first step.
Bulged or leaking capacitors are visible to the naked eye in 60 percent of cases. Carbonised resistors and burnt PCB tracks tell us about lightning damage.
In-circuit ESR meter measurement on every capacitor, MOSFET in/out diode test, fuse and inrush-resistor continuity check.
You receive a written quote with the exact components to be replaced, parts cost, labour and total. You decide whether to proceed before any soldering.
Failed components removed and replaced with high-quality low-ESR equivalents (Panasonic, Nichicon, Rubycon). No-name aftermarket parts not used.
TV reassembled and powered up via an isolated current-limiter, then run for 4-6 hours at full power before collection. Every job verified.
Watch the red standby LED at the front of your TV when you press the power button. The number of blinks before the long pause tells us which sub-system has failed.
| Blinks | Most Likely Cause | Affected Subsystem | Repair Range |
|---|---|---|---|
| 1 | Generic power-rail fault | Bulk capacitor, primary MOSFET | R660 - R1,350 |
| 2 | 5V standby rail dropout | Standby capacitor, regulator IC | R780 - R1,550 |
| 3 | 12V main rail failure | Secondary MOSFET, output cap | R1,100 - R2,200 |
| 4 | Backlight protection trip | LED inverter / open backlight | R900 - R2,400 |
| 5 | Inverter / boost-converter fault | Backlight driver, boost MOSFET | R1,350 - R2,650 |
| 6 | Standby controller fault | Standby IC, opto-coupler | R1,350 - R2,650 |
| 7 | Panel / T-Con comms failure | T-Con board (separate repair) | R1,100 - R2,900 |
Note: blink-code meanings vary by brand. The table above shows our consolidated experience across Samsung, LG, Sony, Hisense, TCL, Skyworth and Panasonic. We confirm the exact meaning for your model during diagnosis.
Most PSU repairs fall into one of three packages. We confirm the tier after the free 30-minute diagnostic.
2 to 4 bulged or low-ESR electrolytic capacitors replaced with low-ESR Japanese-brand equivalents. The classic load-shedding fix.
Capacitor replacement plus a failed secondary-side MOSFET on the 12V or 24V rail. Typical after surge events.
Standby IC catastrophic failure or extensive lightning damage. Full power-board replacement with genuine OEM unit.
Pricing disclaimer: Please note that all prices displayed are estimated starting prices only. Final repair costs may vary depending on the TV size, model, fault diagnosis, parts required, labour, and any additional repairs needed after inspection.
Samsung's BN44 series power boards (BN44-00932A through BN44-01015 and current generation) cover most Crystal UHD, QLED and Neo QLED panels. Known weak point: the secondary 12V capacitors near the heat sink. Capacitor swap typically restores full function.
Samsung TV RepairLG's EAY-prefix power assemblies (EAY63689302, EAY64529501 and similar) are used across NanoCell, UHD and OLED panels. The standby controller IC and the OLED-specific high-voltage boost stage are the most common failure points.
LG TV RepairHisense's RSAG7.820 series power boards (RSAG7.820.7748, RSAG7.820.10675 and successors) appear across the A-series LED and U-series ULED panels. Repeated load-shedding cycles routinely kill the secondary capacitors in this family.
Hisense TV RepairTCL's TNPA-prefix power assemblies and Sony Bravia integrated PSU modules each have their own characteristic failure patterns - TCL is sensitive to the inrush thermistor failing open, Sony Android TV PSUs are sensitive to standby-current measurement IC failure. We work on both.
PSU Workshop
TV power-supply repair sounds straightforward, and at the component level it often is. But there are three things that separate a repair that lasts 8 years from a repair that lasts 8 months. Capacitor brand: we use only Panasonic, Nichicon, Rubycon and other Japanese-tier capacitors with verified low-ESR specifications. The bargain-bin capacitors flooding the Gauteng grey market typically fail within 12-18 months. Current-limited start-up: we power-up every repaired PSU through an isolation transformer and current-limiter, so if anything is still wrong, nothing else gets damaged on the way to finding it.
Full burn-in: every repair runs for 4-6 hours at full load before collection. The vast majority of premature failures happen in the first few hours of operation - we'd rather find them in our workshop than in your lounge. Combined with our standard 90-day parts and labour warranty and our no-fix-no-fee diagnostic, the financial risk of a Nathtec PSU repair is genuinely close to zero.
By far the most common cause of a TV that won't turn on is a failed capacitor on the power-supply board - typically after a load-shedding cycle or mains surge. Other causes include a tripped backlight protection circuit, corrupted firmware on the main board, a damaged standby controller IC or a blown mains fuse. The standby LED blink code (if the LED is still working) often tells us which sub-system has failed before we even open the TV. Watch the LED carefully when you press power - the pattern is the key diagnostic.
Capacitor swaps R660-R1,350, capacitor plus MOSFET R1,100-R2,200, standby controller repair R1,350-R2,650, full OEM power-board exchange R1,800-R3,800. We provide a free written quote after a 30-minute diagnostic, with no obligation to proceed. The diagnostic fee (R300) is waived if you accept the quote.
Different brands use different blink codes but the principle is the same - the TV is telling you which subsystem failed during startup. Generally: 1 blink indicates a generic power-rail fault, 2 blinks point to a standby rail problem, 3 blinks suggest 12V main-rail failure, 4 blinks indicate a backlight protection trip, 5-6 blinks point to inverter or standby-controller issues, 7 blinks suggest a panel or T-Con communication failure. See our blink-code table above for repair-range pricing. We decode the exact pattern for your TV brand in seconds.
In about 80 percent of cases the existing power board can be repaired at component level - typically by replacing 2 to 4 bulged or low-ESR electrolytic capacitors and occasionally a failed MOSFET on the secondary rail. Full PSU replacement is reserved for cases where the standby controller IC has failed catastrophically, where large board areas have been carbonised by a lightning event, or where the printed traces have lifted from a burning fault. Even those cases come in at R1,800-R3,800, which is still dramatically cheaper than a new TV.
Almost certainly yes if the TV stopped working during or shortly after a load-shedding cycle. The repeated hard power-cuts and the surges that follow restoration stress the bulk electrolytic capacitors and the secondary-side MOSFETs on the power board. Capacitors that would have lasted 12 years in stable-mains Europe routinely fail at 4-6 years in Gauteng. The good news is this is one of the most economical repairs we perform - typically R660-R1,700. We strongly recommend pairing the repaired TV with a quality surge-protected power strip to slow the rate of future failures.
Most power-supply capacitor swaps are completed within 24 hours of the TV arriving at our Gauteng workshop. Same-day completion is often possible if the TV is dropped off before 11am. Full OEM PSU exchanges depend on parts availability - common Samsung BN44, LG EAY, Hisense RSAG7 and TCL TNPA boards are usually in stock or available next-day in Gauteng. We confirm a realistic turnaround time as part of your written quote.
No - please do not attempt this. TV power supplies contain large bulk electrolytic capacitors that hold lethal mains-voltage charge for minutes to hours after the TV is unplugged from the wall. Discharging them safely requires the correct bleeder-resistor procedure and an insulated probe. South Africa has too many fatal electrocutions every year caused by people opening live or recently-unplugged televisions. Please leave power-board work to qualified technicians with the right equipment.
Yes, significantly. A good surge-protected power strip (R420-R720 in Gauteng retail) absorbs the voltage spikes that follow load-shedding restorations, lightning events nearby and grid-switching transients. It will not prevent the slow natural ageing of electrolytic capacitors, but it dramatically reduces the rate at which power boards fail catastrophically. We strongly recommend a surge-protected strip with every TV repair we hand back, and many of our customers report no further PSU issues for years afterwards.
If you have searched for TV won't turn on fix, TV power supply repair Gauteng, TV blinking standby light meaning or load-shedding broke my TV, this guide explains exactly what is happening inside your television and how a professional power-board repair gets it working again. The information here is based on more than 3,500 PSU repairs completed in our Gauteng workshop since 2013 - the largest single repair category we run and the one with the most consistent pattern across brands.
Every television contains a switched-mode power supply (SMPS) that converts the 230V 50Hz AC mains supply from your wall socket into the regulated low-voltage DC rails that the rest of the electronics need to operate. Typically those rails are 5V for standby logic (the always-on rail that keeps the remote receiver and the standby microcontroller alive while the TV is "off"), 12V for the main board (the SoC, the smart-TV OS, the tuner), 24V for the audio amplifier and a high-voltage boost rail of 80V-200V for the LED backlight.
Each of those rails has its own regulator stage, its own filter capacitors, its own MOSFET switches and its own feedback loop. The standby controller IC orchestrates the start-up sequence, watches each rail come up in the correct order and shuts the whole supply down if any rail goes out of spec. When something on the PSU fails, the symptoms typically reflect which subsystem lost its power - and the standby LED blink code is the TV's way of telling you which one.
The bulk electrolytic capacitors that smooth the rectified mains and the secondary-rail filter capacitors that smooth the regulated DC are the components most vulnerable to South African mains conditions. Load-shedding hard-cuts repeatedly stress them through inrush-current spikes at restart. Surges following restoration can briefly over-volt the standby rail. Lightning events through the summer storm season can take out the entire primary side. Heat in poorly-ventilated wall-mounts accelerates the chemical degradation of the capacitor electrolyte.
The cumulative effect: capacitors rated for 5,000-10,000 hours at 105 degrees C have their effective lifespan halved with every 10 degrees C above the design point. In a typical wall-mounted Gauteng TV running 4-6 hours a day, this works out to capacitor failures starting at the 4-6 year mark. By 7-10 years almost every TV that has not had a PSU service will have at least one bulged capacitor visible on the power board.
Diagnosis runs in a strict order. First we check the obvious - mains lead, wall socket and any external power brick. About 3 percent of "broken TVs" turn out to be a tripped wall socket or a damaged power cord. Second we check the standby LED behaviour - is there any light at all, is it blinking, what is the pattern. Third we open the back and safely discharge the bulk capacitors through a calibrated bleeder resistor. Fourth we visually inspect for bulged or leaking capacitors, carbonised resistors, burnt PCB tracks or browning around the optocoupler - these are visible faults that diagnose themselves.
Fifth, on cleaner-looking boards, we perform in-circuit ESR measurement on every electrolytic capacitor (low-ESR capacitors that have aged often look perfect but measure marginal) and diode-mode testing on every MOSFET. By this point we know exactly which components need to be replaced, and the written quote follows immediately. The whole diagnostic typically takes 30-45 minutes.
The single biggest variable in how long a repaired PSU lasts is the brand and grade of the replacement capacitors. We use only Panasonic, Nichicon, Rubycon, Chemi-Con and other Japanese-tier brands with verified low-ESR specifications and 105 degrees C temperature ratings. The bargain-bin capacitors sold through Gauteng grey-market component shops at a quarter of the price routinely fail within 12-18 months. False economy in its purest form.
MOSFET replacements get the same treatment - Infineon, Texas Instruments, ON Semiconductor and other tier-one brands only. We don't use the "compatible" Chinese knock-offs that look identical externally but use cheaper silicon and fail under load. Every component replacement is documented on the job ticket so you know exactly what was fitted to your TV. Combined with the 90-day workmanship and parts warranty, this is genuinely tier-one work at independent-shop pricing.
Power supply repair is workshop-based work for safety reasons (those bulk capacitors really are dangerous), but we make collection and delivery effortless. We pick up from and deliver to Johannesburg, Sandton, Pretoria, Midrand, Randburg and Soweto as part of our standard service, usually within 24-48 hours of your initial call.
For related services see our motherboard repair, backlight repair, HDMI port repair and smart TV repair pages. For brand-specific deep dives see Samsung TV repair, LG TV repair, Sony TV repair, Hisense TV repair, TCL TV repair, Skyworth TV repair and Panasonic TV repair. Pricing across all categories is covered in our TV repair cost guide, and our common TV problems guide is the place to start if you're not sure what your TV's symptom actually means.
The fastest way to start is a WhatsApp message to 078 721 3551 with the TV brand, model, screen size and a description of the symptom (standby LED state, blink-code pattern if visible, recent power events, any audible clicks or noises from the TV when you press power). A 10-second video of the standby LED behaviour is even better. We typically respond within minutes during business hours with a likely cause, a transparent price range and the next step - usually a free collection in your area within the same working day. Free written quote, no-fix-no-fee, 90-day workmanship warranty - the same standards we apply to every repair that leaves our Gauteng workshop.
Most "dead TV" jobs are a R660-R1,700 capacitor swap. Send us the model, the symptom and the blink-code pattern - we'll quote you within minutes.
Please note that all prices displayed are estimated starting prices only. Final repair costs may vary depending on the TV size, model, fault diagnosis, parts required, labour, and any additional repairs needed after inspection.