TTBy Tonetron Engineering Team · Dongguan Taitron Electronic Limited
How do I tell whether a complaint is the cable or the device?
Swap-one-variable tests, in a fixed order, before any conclusion.
Answer: change one variable at a time and record the result — the goal is to make the fault follow the cable, or not.
Same cable, different device — fault follows the cable?
Different cable, same device — fault disappears?
Same cable, shorter length or lower resolution — does it pass?
Same cable at the rated bandwidth — does a known-good cable fail too?
If the fault follows the cable, it is the cable; if it stays with the port, it is the device. Write down the model, length and tested resolution for every case.