CEDIA ESPA EST Practice Test

Answer - A - The most likely issue is that there is DC power in the cable.

Key Takeaway: Horizontal rolling bars are caused by DC power getting into the cable system. To fix this issue, you should disconnect the TV from all other components in the system. If the bars disappear, add the other components back in until the bars return. When you find the faulty component, use a DC blocker to eliminate the DC power path to the system.