We are currently facing an issue with multiple PP41 QVGA display units and would appreciate insights from the community.
Problem Description:
During operation, the display suddenly turns بالكامل white (bright backlight ON), with no numeric or alphanumeric characters visible. The system otherwise appears to be running.
Troubleshooting Done:
- We replaced the QVGA display itself → issue persists
- We replaced the PCB (PP41_RIET/2) with a known good board → problem is completely resolved
This strongly indicates that the fault lies within the PCB rather than the display module.
Request for Support:
We are looking for guidance on repairing the faulty PCB instead of replacing it entirely. Specifically:
- Which components are most likely responsible for this type of failure?
- Are there known failure points (e.g., voltage regulators, capacitors, driver ICs, or communication lines)?
- Any recommended test procedures or measurements to quickly identify the defective section?
Additional Context:
- The issue occurs under running conditions in an industrial environment
- Multiple boards are showing similar symptoms
Any suggestions, repair experiences, or technical advice would be highly appreciated.
Thank you in advance for your support.