Sony HT-ST7 Reference Guide - Page 12
Using “BRAVIA” Sync features, Troubleshooting, Power save, Notes on HDMI connections - 4k compatibility
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Notes The above features may not operate with certain equipment. Depending on the settings of the connected equipment, the Control for HDMI function may not work correctly. Refer to the operating instructions of the equipment. Using "BRAVIA" Sync features The original Sony functions listed below can also be used with products that are compatible with "BRAVIA" Sync. Power save If a "BRAVIA" Sync-compatible TV is connected to the system, the power consumption is reduced in standby mode by stopping HDMI signal transmission when TV is turned off. Notes on HDMI connections Use a High Speed HDMI cable. If you use a Standard HDMI cable, 1080p, Deep Color, 3D, and 4K images may not be displayed properly. Use an HDMI-authorized cable. Use a Sony High Speed HDMI cable with Cable Type Logo. We do not recommend using an HDMI-DVI conversion cable. Check the setup of the connected equipment if an image is poor or the sound does not come out of the equipment connected via the HDMI cable. Audio signals (sampling frequency, bit length, etc.) transmitted from an HDMI jack may be suppressed by the connected equipment. Sound may be interrupted when the sampling frequency or the number of channels of audio output signals from the playback equipment is switched. 12US When the connected equipment is not compatible with copyright protection technology (HDCP), the image and/or the sound from the HDMI TV OUT (ARC) jack may be distorted or may not be output. In this case, check the specification of the connected equipment. When "TV" is selected for the input source of the system, video signals via one of the HDMI IN jacks that was selected last time are output from the HDMI TV OUT (ARC) jack. This system supports Deep Color, "x.v.Color," 3D, and 4K transmission. To enjoy 3D images, connect a 3D-compatible TV and video equipment (Blu-ray Disc player, "PlayStation®3," etc.) to the system using High Speed HDMI cables, put on 3D glasses, and then play back 3D compatible Blu-ray Disc. To enjoy 4K images, the TV and players that are connected to the system must be compatible with the 4K images. Troubleshooting If you experience any of the following difficulties while using the system, use this troubleshooting guide to help remedy the problem before requesting repairs. Should any problem persist, consult your nearest Sony dealer. POWER The system is not turned on. Check that the AC power cord (mains lead) is connected securely. The system is turned off automatically. The "A. STBY" function is working. Set "A. STBY" to "OFF" (refer to "Adjusting the settings" in the Operating Instructions). SOUND No TV sound is output from the system. Make sure the input source is selected correctly. You should try other input sources by pressing the INPUT button several times (refer to "Listening to the audio" in the Operating Instructions).