Vizio M221NV sound through headphone jack but not speakers

[johnboy1313]

I've gone through the menu and made sure the internal speakers are on. I've reset the factory audio specs. Still no dice. I see no bulging caps. The headphone jack works. I'm thinking the audio amp is shot. Any ideas?

[johnboy1313]

Re: Vizio M221NV sound through headphone jack but not speakers

Having trouble posting pics. Give me a second

[tom66]

Re: Vizio M221NV sound through headphone jack but not speakers

It is also possible there is a shorted speaker or cable which is putting the amplifier in protection mode; have you tried running it with one or the other speaker?

[johnboy1313]

Re: Vizio M221NV sound through headphone jack but not speakers

No, I will

[budm]

Re: Vizio M221NV sound through headphone jack but not speakers

Can I get the picture of the headphone jack and the board it is mounted on, it may have switches that switches off the speakers when you insert the headphone plug into the jack but did not switch back to the speaker mode when phone plug is removed.

[tom66]

Re: Vizio M221NV sound through headphone jack but not speakers

That is an excellent point. My sister's laptop encountered a similar issue. I forgot entirely about that...

[budm]

Re: Vizio M221NV sound through headphone jack but not speakers

Yes, just like your LG remote input jack.

[johnboy1313]

Re: Vizio M221NV sound through headphone jack but not speakers

Have I been blacklisted from adding pics? I can't even find my photo album in my profile. On both my phone or my computer.

[johnboy1313]

Re: Vizio M221NV sound through headphone jack but not speakers

Jack


Speaker connection. I can't unplug one speaker without unplugging both speakers


What I would think is the audio amp section of the board.


The whole board

[johnboy1313]

Re: Vizio M221NV sound through headphone jack but not speakers

Is there a mechanical connection in the jack that is opened when the plug is inserted?

[randtek]

Re: Vizio M221NV sound through headphone jack but not speakers

Yes there is an internal switching mechanism in , specifically designed to kill the speakers when headphones are inserted. FYI a headphone jack problem is the only thing that I have seen cause the symptom as you describe it.

[johnboy1313]

Re: Vizio M221NV sound through headphone jack but not speakers

How do yo suppose I could confirm this without having a schematic of the board?

[gilly1984]

Re: Vizio M221NV sound through headphone jack but not speakers

put the headphones back in and try whipping it out really fast, it may just be jammed open.

[selldoor]

Re: Vizio M221NV sound through headphone jack but not speakers

How do yo suppose I could confirm this without having a schematic of the board?

If you check the socket and note all the connections to it and try and work out using ohms what is conected when the plug is in, when the plug is out
and the one that doesnt change (that is probably the switch)
Here is a picture so you can see the sort of thing.

[tibimakai]

Re: Vizio M221NV sound through headphone jack but not speakers

I had a similar issue in the past with a 37" Toshiba and we couldn't figure it out, amp IC it was way to complicated to replace, so I have just purchased a 2.1 Logitech speaker system for $28, and this way I have actually upgraded the sound of the TV.

[johnboy1313]

Re: Vizio M221NV sound through headphone jack but not speakers

Well, I'm having no luck getting a clear pic. I was able to carefully pull the plastic housing from the headphone jack. I can see that the mechanical connection is closed. I verified with my meter. I think the amp is shot. I wish I could find a schematic for this thing. For now, I'll use a pair of computer speakers.

[johnboy1313]

Re: Vizio M221NV sound through headphone jack but not speakers

Any one know where I can get a panel mount, 3.5mm, stereo headphone jack like that? I've found them with a 90 degree bend in it, where the jack would point down if it was installed. I need one just like in the picture.

[johnboy1313]

Re: Vizio M221NV sound through headphone jack but not speakers

[johnboy1313]

Re: Vizio M221NV sound through headphone jack but not speakers

I bought a battery powered amplified pair of speakers today. They run off 4.5v. I scavenged the amp out and successfully transplanted it into the set. Found a pin on the main board with 4.9v and got it powered. Soldered the output to the appropriate pins for the speakers and got it all working. I managed to damage the headphone jack so I used a radio shack 274-0246 jack. Common to pin 1, left channel on the main board to pin 5, right to pin 2. Pin 4 goes to the left channel on the amp, pin 3 to the right. It looks different than the original but sounds great. The speakers even shut off when the headphones are plugged in. Best part is if I want to replace the main board nothing has been cut. This board with the new amp comes out together and the original plugs can be used on the new board. I'll get pictures in the morning.