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Depending largely on the age of the TV, the location of the TV tuner varies. An older analog TV tapping a digital signal does so with an external DTV converter box. For cable and satellite subscribers, there is a a set top box. Most TVs purchased after March 2007 have built-in digital tuners. Look on the front and back of the TV for a marking that indicates a digital tuner. It may say ATSC, DTV, HDTV, Digital Ready, HD Ready, Digital Tuner, Digital Receiver, Digital Tuner Built-in or Integrated Digital Tuner. Any of these is an indication that the TV has a built-in digital tuner. You may have to go to the manufacturer's site to determine such specifications. If you are having a problem with a tv switching channels, remedies may be rather specific and you might try googling for a specific model while including the problem in a simple phrase.
Which model do you have? The ATSC tuners were required in 42" TVs starting in the middle of 2005. Some Hitachi 42" TVs built before that date have an ATSC tuner but other models do not. The ones that didn't were usually called HD-ready TVs. For those models, you need a set-top box to receive OTA signals (except for some low power stations that continue to broadcast an analog signal).
If you provide your model number, I'll try to confirm the tuner information. If you look at the model information plaque on the back of the TV, you will see some information about when the unit was manufactured. If it was built in 2006 or later, you can be sure that the unit has a digital tuner.
if there is a label on the tv stating any of these words “Integrated Digital Tuner,” “Digital Tuner Built-In,” “Digital Receiver,” or “Digital Tuner,” “DTV,” “ATSC,” or “HDTV” then yes if they say “Digital Monitor” or “HDTV Monitor,” or as “Digital Ready” or “HDTV Ready" then no
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