Pixellation in pickture and sound interrupted
If the audio is distorted to certain channels only, it is due to improper AGC adjustment. Weak signals won't processed well. You have to enter the service mode to the set, and have to adjust this value. This is somewhat skilled work, that a user can't do. It will be best to contact any service technician, in this case. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
SOURCE: 37" LG 1080p
Hi ks0412,
If you are receiving a High-Definition (HDTV) signal through an over-the-air broadcast, you may see this kind of mosaic-like breakup of the picture and sound if the signal is weak or interrupted. This is the same way that you would receive snow and static with an analog signal in the past. I would suggest readjusting your antenna for better reception on the channels that are giving you trouble.
If you are receiving this broken signal from a subscription-based service such as cable or satellite, I would recommend contacting your service provider for assistance. It could be a problem with the signal, your equipment, or the equipment setup.
Thank you,
Jason,
Go Ahead. Use Us.
SOURCE: No sound when watching freeview on Samsung 32" LCD TV
I`ve got the same problem, sound with analog but not digital?
SOURCE: vizio pixelation in hd nt all channels
Usually a TV that pixelates only on some channels is a problem with the signal levels coming into the TV or the cable box. If you are using a cable box then definatley the signal is the issue..
SOURCE: no sound on some channels, other channels fine
Your SAP/MTS function is most likely turned on. This feature has 3 modes: Stereo, Mono and SAP. Stereo and Mono are easy to understand, it's the SAP that can get you. SAP stands for Second Audio Production. It is used to provide weather, information or an additional language translation of a program. Some broadcasters simply transmit the mono audio over the SAP audio channel when the are not using it for other purposes. Other broadcasters simply do not use it, which does not give you any audio. Look on your remote for a SAP or MTS button. If you do not see one, look in your TV user menu for this feature. If you are using a cable box, look in the audio menu of the cable box. You are looking for something set to SAP... just change it to STEREO. I hope this was helpful.
SOURCE: No sound on 90 HD Digital Channel
You need to get in touch with Lg and they will help you. All you need is for them to either post you a usb with software or they can email it to you and you can put it on a usb and put it on your tv via usb port and update the software on your tv.
The frequency for the new channel is not on your tv but they will give you the software to update so it works.
Good luck!
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