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Re: No picture, box fault
STBs generally do not have an aerial bypass as standard. If the tech who calls decides your STB needs replacement, make sure the aerial bypass is reinstalled.
As for the STB, if it is failing, it can eventually pick up the signals but takes time. hence the Tune signals. Conversely a signal fault may be present. The Faults people by deciding that an engineer was needed. have already agreed you have an issue, so don't worry about demonstrating the error.
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