The Hitachi SP14Q001 is a 5.7‑inch industrial TFT LCD panel with a native resolution of 320×240, commonly used in PLC/HMI displays, medical monitors, and injection‑molding machine screens. Typical failure modes for this class include backlight LED burn‑out or degradation, driver IC overheating, and capacitive touch layer delamination; power supply spikes can also cause pixel dropout or complete screen loss. First‑check diagnostics: verify the panel’s 12 V/5 V supply rails with a multimeter, inspect the backlight LED current and voltage against spec, and examine the I²C/SPI communication lines for proper signal integrity. If those checks are normal, perform a visual inspection of the touch sensor pads and connector pins for corrosion or mechanical damage before proceeding to replace the panel or driver board.[oss-gpt-20b]