回答
this is not a piece of advice to you I'm talking to myself for my practice of writing skills.
I've tried to put your sentences into GT. GT's translation is the next two sentences.
Location of a flat-screen wall-mounted TV in the living room.
A flat-screen LCD TV is leaning against the wall in the living room.
I suppose this is the matter you should decide yourself; because we're all on your side, ours might not become fair for its judgement.
:GT.
https://translate.google.co.jp/?hl=ja&sl=en&tl=ja&op=translate
この質問に回答する
イラストには、居間の壁に薄型液晶テレビが立てかけてあります。このテレビの位置を英語で答える問題でした。
正確な答えは The TV is on the wall in the living.だと思うのですが、解答例では The TV is on the wall.
しかし、居間にあることを考えるとThe TV is in the living room.も正解として有りうるのかと思い、皆様にお尋ねする次第です。