Detailed Answer
Screen abnormality (garbled/black/missing characters) troubleshooting: 1. Low battery (abnormal display) → charge; 2. Water ingress (liquid in screen) → dry/factory; 3. Loose ribbon cable (some models) → factory; 4. Screen aging (end of life) → replace. Lider LD series screens show battery/signal/status; Xingjia high-end models have color screens. Screen faults affect status reading — handle promptly.
| Battery | Charge first |
| Water ingress | Dry |
| Aging | Replace |
Note:The unit may still operate with a faulty screen, but confirm status carefully.