Weak hdtv signal and cable tv

G

Guest

Guest
Hello,
sometimes using the hdtv mode on my hdtv on many channels the picture blinks black constantly while on other channels it does not. when this happens i have to switch to coaxial mode. I use hi quality hd connectors and I have replaced the cable box but get the same results. The tv is LG HDTV. manufacturer says it is the cable box. Can someone tell me what is causing this
 
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