Sony KDL-70X830B - Manual (Page 230)

An external device (such as a set-top box or AV
receiver) cannot be controlled via the IR Blaster.
Make sure that the IR Blaster is correctly set up and the IR transmitter is
located near the IR receiver of the external device.
Make sure that your TV supports the external device.
If you press and hold a button on the remote control, the operation may
not be transmitted. Instead, press the button repeatedly.
Some external devices may not respond to some buttons on the Screen
Key Pad.
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