HMI (operator panel)Illustrative example
Operatör paneli
The HMI does not power up or the screen is very dim; touch is unresponsive.
Duration: Same weekUpdated: 2026-07-07
Before
Faulty — board out of service
After
Repaired — tested under load
Fault
The HMI does not power up or the screen is very dim; touch is unresponsive.
Analysis
The supply rail was measured; the internal DC-DC converter output had dropped. Additionally a component in the backlight driver circuit was faulty.
Repair Steps
- 1Supply measurement
Input and internal DC-DC rails measured.
- 2Supply + backlight repair
DC-DC converter and backlight driver parts replaced.
- 3Function test
Screen brightness and touch response verified.
Changed Components
- Internal DC-DC converter
- Backlight driver parts
- Electrolytic capacitors
Test Result
Screen powered at normal brightness; touch calibration verified.
This is an illustrative repair flow that shows the process; no real customer/board information is shared.
Related Topics
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