The Komatsu PC400‑7 Monitor is an LCD cluster panel (part 7835‑10‑2005/7835‑12‑2008) that displays engine, hydraulic and operational data for the excavator. Common failures include backlight failure or dimming due to a burned‑out LED driver, power‑supply voltage drop at the 12 V input, connector corrosion causing intermittent signal loss, and occasional display flicker from a loose ribbon cable. First‑check steps: verify the 12 V supply voltage at the monitor harness; inspect all connectors for corrosion or looseness; examine the LCD backlight LED driver board for visible damage or burnt components; then review any diagnostic codes on the main controller that reference “LCD” or “display”.[oss-gpt-20b]