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Depending on where the set was purchased (USA) it may be NTSC format and Brazil is likely to be different format like PAL or even Seacam---they do make converter boxes that will convert signal from one format to another.
Please open the AUDIO settings and check the AUDIO frequency set on the chosen channel.
Make sure it corresponds the frequecy in your transmission.
It can be 4.5, 5.5 or 6 if PAL is the colour system . ( being PALB/G, I or M)
Select accordingly and set.
PAL-M is 525 line 29.97 frames per sec, PAL-N is 625 line 50 frames per sec. Most countries (e.g. UK) use PAL B/G/D/K/I which is 625 line 25 frames per sec. PAl-M is used in Brazil, PAL-N is used in Uraguay and Paraguay. Most modern TVs will handle both PAL and NTSC as long as the RGB input is used (via scart or HDMI).