Voi porni televizorul după cină.

Yes, voi can mean two different things:

• voi = you all / you plural as a pronoun
• voi = I will as a future auxiliary

In Voi porni televizorul după cină, it is the future auxiliary, because it is followed by porni, an infinitive. So voi porni means I will turn on / I will start.

Romanian often has forms that look identical but are understood from context.

Because voi porni is future, while pornesc is present.

• pornesc = I turn on / I start
• voi porni = I will turn on / I will start

Romanian commonly forms the future with:

voi + infinitive

So here:

• voi = future marker for I will
• porni = infinitive of a porni

That is why the verb is not conjugated as pornesc in this sentence.

Romanian often leaves out subject pronouns when the verb already makes the person clear.

So:

• Voi porni televizorul după cină = I will turn on the TV after dinner
• Eu voi porni televizorul după cină = same meaning, but eu adds emphasis

You would include eu if you wanted contrast or emphasis, for example:

Eu voi porni televizorul, nu tu.
I will turn on the TV, not you.

Because Romanian usually puts the definite article at the end of the noun.

• televizor = a TV / television set
• televizorul = the TV

So the ending -ul here is the equivalent of English the.

This is one of the biggest structural differences from English:

• English: the TV
• Romanian: televizorul

După cină is the normal way to say after dinner in a general sense.

This works much like English:

• after dinner = general routine time
• after the dinner = a specific dinner

Romanian often uses meal words without the definite article in this kind of time expression:

• după cină = after dinner
• după prânz = after lunch
• după micul dejun = after breakfast

If you wanted to refer to a specific dinner, you could make it more specific, for example:

• după cina de azi = after today’s dinner

Yes. A porni is very natural for devices, machines, and electronics, and it can mean to start or to turn on.

So:

• a porni televizorul = to turn on the TV
• a porni mașina = to start the car
• a porni calculatorul = to turn on the computer

A related verb is a aprinde, but that is more commonly used for things like:

• lights
• candles
• cigarettes
• fire

So for a TV, a porni is the most natural choice.

The given order is very natural:

Voi porni televizorul după cină.

But Romanian word order is fairly flexible, so you can move the time expression for emphasis:

După cină, voi porni televizorul.

This still means the same thing, but it highlights after dinner a bit more.

The original sentence is the most neutral, everyday ordering.

A rough English-style pronunciation is:

voy por-NEE te-le-vi-ZOR-ul DOO-puh CHEE-nuh

A few helpful details:

• voi sounds roughly like voy
• porni has stress on the last syllable: por-NEE
• televizorul has stress on ZOR
• după contains ă, which sounds like the unstressed vowel in sofa
• cină begins with c pronounced like ch before i, so it sounds like CHEE-nuh

Yes. In spoken Romanian, a very common future form is:

O să pornesc televizorul după cină.

This also means I will turn on the TV after dinner.

Very roughly:

• voi porni = standard, clear, slightly more formal or neutral
• o să pornesc = very common in everyday speech

Both are correct. A learner should understand and eventually use both.

The dictionary form is a porni, which means to start or to turn on.

Romanian infinitives are usually listed with a:

• a porni
• a merge
• a vedea

But after the future auxiliary, Romanian uses the infinitive without a:

• voi porni
• not voi a porni

So porni in the sentence is the infinitive form of the verb.