Headphone out jack is really quiet.

19LD350 is a small TV with tiny speakers, also if you are using a cable box it may not be properly set. Also try cleaning headphone jack [WD40] only a short spray in hole for headphone

Most low-end TVs (no offense meant) do not have earphone output these days.

if you're into hacking you can just make yourself an output. It's not really a rocket science project , but does require some effort.

I am sure there will be manuals online on how to do it becuase the principle is going to be the same for every single TV out there.

Here's one possibility:
http://www.instructables.com/id/Simple-TV-headphones/

Here's another:
http://forum.videohelp.com/threads/333204-Tv-with-no-headphone-jack-AND-rca-audio-outputs

I am sure there will be better ones too.

Most stopped having that feature as the jacks can short out and damage the audio circuit in the set-----there are some aftermarket boxes that connect and have wireless headphones--no internal connection as they are hooked up in line with the incoming signal from cable or antenna---search the internet and you will see them.

sometimes headphone jacks can be on the sides. I'm not saying this is the answer to your problem, but you can look

if you want audio as well, it will depend on what kind of audio connection your tv has next to the VGA (computer monitor) connection. If it looks like the normal RCA audio, (red and white plugs) you will need to get a male headphone jack (to plug into your computer headphone or speaker out jack) to stereo RCA cable so you would have a headphone jack on one side of the cable and a red and white plug on the other side. Now if your TV just has what look like a headphone jack next to the VGA (computer monitor plug) you will need to buy a male to male stereo headphone jack cable. for both of these, just make sure the cable you get it long enough, or buy an extension.

It definitely has built in speakers:

Built in Speakers 2 x 3W speakers

It also has a headphone out jack. If you can't get sound, check and see if the headphone jack works. Does the volume control work? If they do your problem is with the speakers. They may be blown or just disconnected.

If you can't get sound through the headphone jack and you do have volume control but no sound, it probably a problem with the mainboard. It may need to be replaced.

Not really worth fixing in my opinion. I'd Just get some external speakers and connect them that way. Of course, if you are relying on a cable input, thats a bit harder and you would need some tuner or a DVD/VCR player with a tuner that has the standard RCA red and white audio output.

I don't know about replacing a jack but BN94-01208C fits LNT1953HX is the main pcb that has all of the av inputs on it and it is a snap to change.

The only audio out jack on your TV is for the headphone on the left side of the TV. You need to purchase a 3.5 mm to RCA audio cable, connect the 3.5mm jack to the left side of your TV and the 2 RCA audio cable ends to the audio in of your Home Theater and then select AUX 1 or AUX 2 on the home theater depending on which jacks you plugged into.

does your tv not have an audio out, if so, you could turn the tv's internal speakers off and just use the audio out jacks instead.

Not unless you know how to work on a headphone jack and how the jack and the jack switchs work??? Also if you dont know about the HI Voltage saftey issues, it would be best for you to bring this set to a pro tech, as it shouldnt cost to much for a new headphone jack??. Good Luck