Lincoln Welder SP-150 SCR Control Board
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The Lincoln Welder SP‑150 SCR Control Board (model G‑1687‑1) is the main power‑control module for a MIG welder, handling phase control, current regulation and safety interlocks. Common failure modes include burned‑out SCRs or gate drivers, damaged capacitors on the high‑voltage rectifier section, and loose or corroded terminal connections that cause intermittent operation or no output. First‑check steps: verify 120 V AC input and proper grounding; inspect the board for visual signs of component damage (burn marks, bulging caps); test SCR gate drive signals with a multimeter and confirm the current sense resistor is within tolerance before proceeding to more detailed diagnostics.[oss-gpt-20b] |
Need your Lincoln Welder repaired or tested?
We specialize in the repair and refurbishment of high-end industrial control electronics and power systems like this unit.
- ⚙️ Fast Diagnostics – Same-day evaluation available
- 🔁 Reliable Turnaround – Most jobs ship within 5–10 business days
- 🧰 Expert Technicians – Decades of board-level experience
- ✅ 1-Year Warranty – Every repair fully guaranteed
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- 🔧 Board-level diagnostics (shorts, VRM, memory, fan, thermals)
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- ✅ 1-Year warranty on completed repairs
Free Estimates • Industrial-grade testing • 1-Year Warranty • Nationwide Service
Other Repaired Units by Lincoln Welder
Lincoln Welder G4407-1A0 Controller BoardLincoln Welder SP-150 SCR Control BoardLincoln Welder SP150 G-1687-1 SCR Control BoardLincoln Welder SP150 G-16851-1 Motor Control BoardContact Us
🚑Shop Location🛠️
Industrial Electronic Repair
145 Rockwell Place Ct
Tobaccoville, NC 27050
🚑 Rush repair shipments only — no walk-ins.
📞Phone
📦Mailing Address🚛
Industrial Electronic Repair
931-E S. Main St #204
Kernersville, NC 27284
📦 Mailing Address (for invoices or shipped repairs)
No walk-ins accepted.