AV Receiver TX-SR606

This receiver came as part of Home Theater System HT-S7100 and is in use for the past 3 years. The Comcast Cable box is fed to this receiver along with other accessories and the receiver signal output fed by HDMI to TV. The receiver constantly says "no signal" and takes a long time to show TV channels. Sometimes it takes powering ON and powering OFF the receiver a number of times before it starts to work. It does the same for other inputs too such as DVD/CD player, ROKU. Connecting the Comcast cable box directly to the TV works perfectly fine.
What causes this delay in receiver functioning properly?

In regards to your issue- it would possibly be more effective to contact our Product Support Dept, 800-229-1687 for further assistance with this specific issue via our phone number and hours of operation below. We would like to speak with you and work to troubleshoot and resolve your issue, with you having access to your unit, as prompt as possible. We would like to speak with you and provide a thorough answer to your inquiry and assist you with any further questions you may have. Product Support is here Mon. to Fri. from 9am to 8pm and Sat. and Sun. from 10am to 4pm eastern std. time.

Thanks,

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