Coherent 0633‑476‑01 is a high‑resolution industrial touch screen display terminal used in medical laser systems such as the Lumenis Versa Pulse Power Suite. Common failure modes for this class of equipment include backlight degradation, capacitive sensor drift or loss, and power supply voltage instability that can cause intermittent or complete loss of image. Initial troubleshooting should verify the 12 V/24 V DC input with a multimeter, inspect the display panel for visible cracks or moisture ingress, and check the I²C/SPI communication lines for proper voltage levels and continuity. If the screen remains blank but power is present, test the touch controller firmware by cycling the reset pin and reviewing any error codes on the host system’s diagnostic console.[oss-gpt-20b]