The HMI screen goes black upon power-on, but works normally after powering off and on again. It cannot be turned on after the screen saver is activated, and the screen suddenly goes black during use.
Fault Analysis:
1. Black screen upon power-on.
1. Insufficient power supply current while simultaneously powering other electrical appliances.
2. Quality issues.
2. The screen cannot be turned on after the screen saver is applied.
1. Quality issues.
2. Error in operating system control area.
3. Black screen during use.
1. Screen saver or backlight energy saving settings are enabled.
2. If there is a high-frequency interference source, the HMI will automatically enter protection mode. For example, a walkie-talkie.
3. Excessive ambient humidity triggers the backlight's protection mechanism.
Elimination method:
1. Provide an independent switching power supply for the HMI, ensuring minimum power consumption and ideally maximizing amplification.
For quality issues, please return the unit for repair or replacement. The method for detecting quality issues is to use another...
A normal HMI is used for a cross-replacement test of the LCM and motherboard.
2.1. Return to the manufacturer for repair or replacement.
2. Remove system control area restrictions.
3.1. Explain to the operator or disable the screen saver.
2. Re-power on the device or shield any sources of interference, such as high voltage or high frequency sources.
3. Remove system control area restrictions.
4. Excessive ambient humidity triggers the backlight's protection mechanism.
