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Internal and external spares for an AC/DC TIG inverter power source: how to identify the right part, what fails, and how to work safely.
Start with the rating plate on the machine, which gives information about the manufacturer, supply requirements, performance and suitability for use. Note the type, serial number and any version marking, then find the matching parts list or service documentation from the maker.The part number printed on the old item, where there is one, helps confirm the match, but do not rely on appearance alone. Boards, diodes, transformers and connectors often look alike while differing in ratings or fit between versions. If you are unsure, our team can help you work out which part your machine's documentation points to.
An inverter power source converts the mains AC to high-frequency AC, steps it down through a transformer to welding voltage, and then rectifies it to DC. So the main groups are the input stage and its protection, the switching or power board, the high-frequency transformer, the output rectifier (often a diode board or card), the control electronics, and the output connections.On an AC/DC machine there is additional circuitry to produce the AC output. Spares are usually listed by these groups in the maker's parts list. The exact layout differs from model to model, so use your own documentation.
A competent person, not the user. The HSE says repairs should only be carried out by a competent person, meaning someone with the skills, knowledge and experience to do the work safely. Maker manuals for AC/DC TIG machines say maintenance should only be done by a qualified person, with the machine disconnected from the mains and a wait before internal work, because internal voltages and currents are high and dangerous.The wait time and any discharge procedure are machine-specific, so follow the service manual rather than assuming. If you are not qualified, send the machine to a service engineer who can fit the part and test it afterwards.
Sometimes, but not always. A failed board can be the result of another fault elsewhere, such as a failed protective part, a poor connection, overheating or a supply problem. If the cause is not found, the new part may fail too.A qualified technician will normally check the related parts, connections and cooling as well as the part that has visibly failed, following the maker's service procedure. Giving the technician the rating plate details, the error code shown and a description of what happened when it stopped helps them work out the cause faster. Treat any quick fix that bypasses a protective part as unsafe.
