LG 6871W2S152A is the control‑board assembly sub for LG oven and microwave ranges, housing the main microcontroller, power regulation circuitry, and I/O interfaces that drive heating elements and sensors. Common failure points on this board include burnt or cracked voltage regulator ICs, damaged MOSFET drivers for the heating coils, and shorted trace paths between the control logic and the high‑current output pads; visual inspection often reveals burn marks or loose solder joints. First‑check diagnostic steps: verify that the 120 V AC input is present at the board’s power connector, measure the DC supply rails (typically +5 V, +12 V) for correct voltage levels, and inspect all I/O pins for continuity to their respective sensors or relays; if any rail is out of spec or a pin shows a short to ground, replace the corresponding component or re‑solder as needed.[oss-gpt-20b]