Description
*Description:*
In this video I repair a *Havells 3.5 kVA off-grid solar inverter* by *replacing the control PCB board* (no AC output / fault condition). Watch the full step-by-step: safety isolation, cover removal, connectors & gate-drive checks, old board extraction, new control board install, and final load test.
*Safety first:* Work only if you’re qualified — capacitors can hold lethal voltage. Disconnect battery & PV, verify ZERO-V with a meter, use insulated tools, and avoid shorting gate traces. If unsure, refer to a certified technician.
*What’s covered*
• Symptoms: no output, fault beep/code, dead display, relay not clicking
Tools I used: multimeter, screwdrivers, anti-static wrist strap, contact cleaner, magnifier
Disassembly tips (hidden screws, ribbon-cable latches)
• Visual inspection: burnt driver, puffed caps, dry joints, relay contacts
• Control board swap (model/connector match-ups) and *pre-power checks* • First power-on test *without load → with load* (fan, lamp, drill)
• Quick note on firmware/jumpers (if applicable to batch)
🙏 *Huge thanks* to viewers who share their batch numbers & board codes in comments — it helps others find the exact PCB.
👇 *Tell me your symptom* (no output, overload error, humming relay…) so I can reply with likely culprits.
*Like* if it helped, *Subscribe* for more inverter/UPS repair tutorials, and ring 🔔 so you don’t miss the next deep-dive (IGBT driver testing, relay bypass, firmware reset).
*Disclaimer:* This video is for educational purposes. Opening the unit may void warranty. Work at your own risk. I’m not liable for damage/injury.
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🔑 Keywords / Tags block (paste into YouTube tags & sprinkle in description)
Havells 3.5kVA inverter repair, Havells off grid inverter PCB change, control board replacement, inverter no output fix, inverter fault repair, solar inverter repair, off grid inverter service, PWM inverter PCB, inverter driver board, IGBT driver check, inverter relay not working, inverter dead display, inverter beep fault, battery inverter repair, Havells solar inverter, inverter troubleshooting, power electronics repair, DIY inverter fix
Similar brands (for reach): Luminous inverter repair, Microtek inverter repair, Sukam inverter repair, Exide inverter repair, Livguard, V-Guard, Smarten, Okaya, UTL solar inverter, Arise India
📌 Hashtags p
but at bottom of description)
#HavellsInverter #InverterRepair #PCBReplacement #OffGridInverter #SolarInverter #ControlBoard #ElectronicsRepair #DIYRepair #Havells #InverterNoOutput #3_5kVA
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