Urgent, the boot image of my Xiahua microcrystalline painting is flashing. And a row of letters. It's still the same after restarting the machine, and then I shut down and connected the cable set-top box with I believe the problem you mentioned can be tried several times. Some faults only show up under certain conditions.

After time verification, when it happens, you can shoot the bad ones with your mobile phone.

1. The design defect of the set-top box may not affect the viewing.

2. The problem of the connecting cable, poor contact (is the row of letters you mentioned the trademark of the TV itself: it appears when there is no signal)

Take the evidence for feedback again, and it is best not to affect the viewing.