- Touch layer fault: Normal display output, but partial/full touch failure, ghost touch or response delay;
- Display layer fault: Normal touch function, but black spots, light leakage, color shift or screen flickering;
- Composite fault: Both display and touch abnormalities, requiring full assembly replacement.
- Avoid replacing full assembly for pure touch faults, which increases customer cost;
- Avoid replacing only digitizer for hidden LCD damage, which causes secondary complaints;
- Recommend pre-repair full-function testing tools for repair shops.
- Stock separate digitizers and LCD assemblies separately by model;
- Double-check fault type with buyers before shipping bulk orders;
- Provide free fault judgment guidance for cooperative partners.