Choose the right entry point before replacing parts

How to Use WelderData

WelderData is a repair database for qualified welding-machine technicians. It is organized so you can start from what you actually know: a model name, a visible symptom, a diagnostic workflow, a board connector, a circuit path, a suspected component, a chip clue, a real case pattern or an interactive precheck.

Start from the evidence you have

Do not start by replacing a board. First choose the entry point that matches the evidence available on the bench.

Known model

I know the machine model

Start from Models when the machine is LGK100L, MIG200DL, CT-312, ZX7-160/200, WSM-315, WSE or another known family.

Visible symptom

I only know the fault symptom

Start from Faults for no output, breaker trip, protection light, no HF, no gas, weak current, no wire feed or burned power devices.

Board evidence

I am looking at a board or connector

Start from Boards when the evidence is a board name, socket, connector, measurement rail or board-stack layer.

Guided check

I want a precheck or selector

Start from Tools for guided IGBT replacement prechecks and future diagnostic selectors based on existing workflows.

The main repair workflow

The safest way to use WelderData is to move from symptom to evidence. Do not jump from one visible symptom directly to a board replacement. Use model pages, diagnostic routes, board references, circuit paths and component tests to narrow the fault.

1. IdentifyModel, process and visible symptom.

2. RouteOpen the matching Fault, Model or Diagnostic page.

3. MeasureCheck connector, voltage, feedback or board evidence.

4. ConfirmUse component, chip, case or tool pages before replacing parts.

Entry points by repair situation

Choose the section that matches your current information.

ModelsKnown machine model or model family, such as LGK100L, MIG200DL, CT-312 or ZX7-160/200. FaultsVisible symptoms such as no output, no gas, no HF, breaker trip, protection light or weak current. DiagnosticsStep-by-step troubleshooting workflows after the symptom or model is known. BoardsBoard, connector, socket, rail and measurement-reference pages. CircuitsFunctional signal paths such as TIG HF sequence, gas solenoid control or MIG wire feed. ComponentsPart-level testing for IGBT, rectifier bridge, Hall sensor, relay, solenoid or output diode. ChipsIC-level logic for PWM controllers, optocouplers, op-amps, driver paths and shutdown evidence. Repair CasesReal troubleshooting evidence and reusable lessons from specific repair patterns. ToolsInteractive prechecks and diagnostic selectors built from the repair logic.

Example: no welding output

If a machine powers on but has no welding output, do not immediately replace the main board. The correct entry depends on what you know.

Start from FaultsUse this when you only know “welder no output” or “fan runs but no arc.” Gas / HF / No Output IndexUse when gas or HF evidence is involved. ZX7 Indicator On, No OutputUse when the known model is ZX7-160/200. CT-312 HF Present, No Arc TransferUse when the CT-312 start support works but the main arc does not transfer. TIG Pre-Flow + HF Works, No CurrentUse when TIG gas and HF work but current permission is missing. Then use BoardsConfirm connector, board, driver, transformer, output diode or feedback evidence.

Example: IGBT or MOSFET failure

If a power device is shorted, the device may be the result, not the root cause. Use the failure index and precheck tools before powering replacements.

Power Device Failure IndexStart here for IGBT, MOSFET, rectifier bridge, output diode and repeated failure routes. IGBT / MOSFET Keeps BlowingUse when replacement devices fail again. IGBT Replacement PrecheckRun before installing and powering replacement devices. IGBT Module TestingComponent-level IGBT testing reference. Rectifier Bridge TestingBridge rectifier and diode module test reference. Then use BoardsCheck driver transformer, DC bus, output load and board-level evidence.

Safety note

Welding machines contain lethal voltage, high-current DC buses and charged capacitors. WelderData is a technical reference for qualified repair technicians. Discharge capacitors, isolate power and use proper test equipment before measuring or touching internal circuits.

Read the full safety notice