If the receiving card is suspected to be faulty, troubleshoot in the following steps:
1. Check whether the power supply of the receiving card is normal (e.g., whether the power indicator is on);
2. Replace with a known normal receiving card for testing to confirm whether it is physical damage;
3. Check whether the flat cable connection is firm, especially the input end interface;
4. Use a multimeter to detect whether the output signal voltage of the receiving card is stable.
Summary: Damage to the receiving card is one of the common causes of no screen display, but a comprehensive judgment combined with the power supply, flat cables and other links is required. Systematic troubleshooting can quickly locate the fault point and avoid misjudgment.
