Der neue Fernseher steht im Wohnzimmer.

Adjective endings in German depend on the article, gender, case, and number of the noun. Here you have:

• Definite article der (strong ending pattern)
• Masculine noun Fernseher
• Nominative case
• Singular

With a definite article in the nominative masculine singular, the adjective takes the -e ending. Hence neu → neue.

German speakers often use verbs of position (stehen, liegen, sitzen) to describe where something is physically placed.

• stehen literally means “to stand,” and it’s used for upright objects or things in a standing position (like a TV on a stand).
  If you said Der Fernseher ist im Wohnzimmer, it wouldn’t be wrong, but steht gives a clearer picture that the TV is standing somewhere in the room.

Im is the contraction of in dem, which is dative masculine/neuter singular. When you describe the location where something “stands,” German uses the dative case for the prepositional phrase of place.

• in
  • dative → im
• Wohnzimmer is neuter, so dem Wohnzimmer becomes im Wohnzimmer.

Yes, im = in dem. Use im whenever you have:

• The preposition in indicating location or time,
• A masculine or neuter singular noun in the dative case.

Examples:

• im Park (in the park)
• im Januar (in January)

German main clauses follow the V2 (verb-second) rule: the finite verb (steht) must be the second element. Both orders below are correct, but they place emphasis differently:

1. Der neue Fernseher steht im Wohnzimmer.
   – Topic: we start by talking about the new TV.
2. Im Wohnzimmer steht der neue Fernseher.
   – Topic: we start by talking about the living room.

In both, steht remains in second position; the subject and prepositional phrase can swap places for emphasis.