- 1). Switch channels on your Sony TV using the built-in tuner (not the cable box receiver's tuner) if a cracking sound is audible when channels are changed. The cracking noise could indicate a fault with the cable box. Adjust the output setting to 1080i on your cable box, and select PCM (pulse-code modulation) on the audio screen, as instructed on the Sony website.
- 2). Turn off your Sony TV using the main power button on the television (not the remote control), if you notice a blinking red LED light at the bottom of your set. The red warning light signifies a technical fault with your Sony TV. Unplug your TV, wait 60 seconds, and reconnect. Reset the TV to its original factory settings by holding down the "Reset" button on your remote control. A factory reset will usually fix the fault, according to the Sony Customer Support website.
- 3). Switch channels on your television if a "No Signal" message appears on the screen, as you may be on a channel that is currently inactive. Examine the coaxial cable at the rear of your Sony set, making sure it is securely fixed in the "RF" portal. If you have a gaming console or DVD player connected to your Sony TV, make sure the cables are securely fitted to the correct outlets if the "No Signal" message appears. These cables are often color-coded for HDMI devices such as gaming consoles. Change to another DVD or game to determine whether the fault is with the disc, rather than the TV.
- 4). Press "Mute" on your Sony remote control if you can't hear any sound from your TV. You could have accidentally activated the "mute" button. Disconnect any headphones that were left connected to your Sony TV, as these will prevent external sound output. Push the Menu button on your Sony remote, and select Audio from the onscreen display, if you still have no sound. Check that "Modular Television Settings" are selected as either "Main" or "Stereo." Check that the speaker balance is centrally set between the left and right speakers, as sound may be inhibited if it is sent to only one speaker.
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