Troubleshooting a blank screen on a payment terminal. Diagnostic steps focus on external factors, power, and environmental conditions. Avoid opening the device.
Consult the manufacturer's specifications to confirm the operating temperature range.
Refer to the device's documentation for diagnostic procedures.
The power supply specifications are usually printed on the power adapter itself.
The display unit relies on an inverter to supply high voltage to the backlight. Inverters are susceptible to voltage spikes, thermal stress (-40C rated for external environment), and component aging. Liquid ingress can cause short circuits leading to inverter failure or complete system shutdown. External electromagnetic interference (EMI) can also affect the display driver circuits. Low voltage power (5V/3.3V) supplied to the display panel can lead to a non-functional display.
Display shows no image or backlight illumination. Device is unresponsive from a visual perspective.
Safe Handling procedures must be followed. Always disconnect the power supply before inspecting any cables or connections. The pay station operates on mains voltage; improper handling can result in electric shock. Avoid operating the device in wet or damp conditions. Do not attempt to open or disassemble the device as it contains tamper-evident mechanisms. Extreme cold can make plastic brittle; handle with care to avoid breakage.
Regularly inspect and clean the device, ensuring proper ventilation to prevent overheating. Ensure the device is protected from direct exposure to extreme weather conditions (below -40C). Apply strain relief to all cable connections to prevent damage. Shielded cables can reduce EMI.
Some pay stations have a diagnostic mode accessible via a specific key combination at startup. Consult the manufacturer's documentation for instructions. This mode may provide error codes related to the display or power supply. Also, check for obvious physical damage to the external display connector (bent pins). A ferrite choke on the power input cable can reduce EMI.