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Strange Issue with DVI-D to HDMI & RCA to 3.5mm (no sound)

post #1 of 11
Thread Starter 

OK, so the issue started when I got my computer together HDMI to HDMI setup no sound so upon doing some research I found out to have sound over HDMI I need an S/PDIF cable to make that happen as my motherboard didn't support that I decided to go with the other option illustrated in my TV's owners manual (LG 47LA6200) DVI to HDMI & RCA to 3.5mm. So That being said I went out bought the cable (Already had the DVI and its a DVI-D converter) so I plugged it in no sound, turned off sound through DVI in the Nvidia control panel no sound, called LG tried numerous things such as changing resolution to 720p and relabeling the HDMI 1 to PC and no sound, so after about 12 hours on the phone (Not kidding) they offered to send me a tech to fix the device. So I described the problem to the tech and he pre ordered the board that deals with sound and video in the TV he replaced the board and again I have no sound. The strange thing is though I can get the sound through every single input that doesn't have a video coming through it (both empty HDMI ports, AV and Component) but I cannot get sound and video at the same time. There have only been two time I actually got it to work but only briefly, And it involved swapping HDMI 1 to HDMI 2 then letting sound come through HDMI 1 and switching back but this only has worked twice of like a good 100 attempts and when It did work both times It changed my monitor to 720p and when the PC went into sleep mode it stopped working and the second time trying to reset the resolution back to 1080p caused it to immediately stop (I have tried putting it back into 720p and doing the swap trick to no end). I honestly have no idea as to what the issue is here the only thing I can think is LG decided to include this feature and forgot about it. It however is clearly depicted in the manual on page 24-25


My computer specs are: H81M-p33 MSI mobo, i5 4430, 8GB 1600mhz ram, 750 GB 5400 rpm hard drive, FBM-01 Rosewill case, Nvidia GTS 250 gpu, Rosewill 450 w PSU but I do not imagine this really has much to do with the issue as it plays the audio through my headphones just fine, and the default audio devices is the port being used for the tv. Any and all help is greatly appreciated! Also, If you happen to have the same TV and wouldn't mind setting up a similar config to see if it works or not it would be very appreciated.

post #2 of 11
Maybe an answer here in following link. Scroll down to near the end for a solution found by a poster there. Read all the posts anyway:

https://forums.geforce.com/default/topic/510125/no-audio-on-hdmi-with-gts250/

Good luck,

Freddy

Later edit: For those who don't want to wade through the above referenced posts, here is a summary: Basically, the Nvidia GTS-250 graphics card doesn't support sound over HDMI like more recent cards do.

According to the link, to make the GTS-250 card provide sound over HDMI, you have to connect a 2-wire sound line from the card (it has a connection) to the motherboard's sound port, located on the flat side, not on the motherboard's backside.
Edited by Freddyki - 2/19/14 at 7:07am
post #3 of 11
Thread Starter 

Unfortunately my motherboard does not support S/PDIF. Thanks for the reply though!

post #4 of 11
Dylan, my understanding of the comments in that referenced post, is that you don't need S/PDIF. You just need a two wire audit line (look at the picture of the line in the link). Try connecting a line like you see in the picture to your front panel audio connector, or any other audio connection you may find for a two wire line. That line looks like the same kind of line we used to use to connect audio for a CD-ROM drive. A line like that costs very little, maybe a buck or two. Worth a try with nothing to lose.

Freddy
Edited by Freddyki - 2/20/14 at 2:54am
post #5 of 11
Thread Starter 

Again I do appreciate the reply, but I an pretty sure he is talking about spdif to spdif which my mobo doesn't support. (See quote)

Quote:

Got the wire today. I referred to the Motherboard Manual(P7P55 lx) and connected the corresponding end into the spdif/GND jack. The other end, however is slightly smaller than the input jack on the graphics card(nVidia GTS250).



This shows the jack. The fan is connected to the white jack on the left. The white jack on the right is the only other jack on the card and is the one the manual directs the audio input to.

Image





This shows the other end of the spdif cord I bought and it's smaller than the jack. I forced it in anyway. I can make it fit, but it clearly isn't made to.

Image



So here's where am I at now. I turned off my computer to double check that the connections were snug and it was plugged in correctly on the motherboard. It is. I tested the sound on youtube and a movie, but I get nothing. Though every now and again I hear crackling and fuzz in the HDTV speakers. The fact that it's coming from the speakers gives me hope.



I'm going to try to reverse the spdif/GND end. Maybe it was incorrectly labeled. Any further help is much appreciated.





EDIT: Looking at the manual again, I guess although the one end of the spdif cord looks small, it is the correct cable. The picture shows the exact same end.
post #6 of 11
Well, that picture of the sound cord he's holding looks like a plain two wire connection. I've not seen a S/PDIF wire that looks like that, though he calls it that. Maybe I've not seen everything. I think the problem is that the picture doesn't show the entire cable. That one end looks like a plain old two wire audio cable. Maybe it's not.

Freddy
Edited by Freddyki - 2/20/14 at 6:40pm
post #7 of 11
In my previous post, I forgot to add that it looks like you need to upgrade your graphics card (and drivers) to enable sound over HDMI. Sorry that the audio cable idea didn't work out.

Freddy
post #8 of 11
Thread Starter 
Quote:
Originally Posted by Freddyki View Post

In my previous post, I forgot to add that it looks like you need to upgrade your graphics card (and drivers) to enable sound over HDMI. Sorry that the audio cable idea didn't work out.

Freddy


Not so sure about that either, Because Sound will not come through with my on board graphics either.

post #9 of 11
Thread Starter 

Found some people having this issue with Intel CPU's in general, I guess the POS drivers intel uses throw false audio signals causing the TV to think there is audio "in these here hills" (Lol) so it tells analog to piss off because it's busy. So not really sure how to fix that. I thought of cutting the audio pins or wire in the HDMI cable but I guess that connector is not that straight forward (Like anything in this problem has been straight forward lol) so IDK.

post #10 of 11
Quote:
Originally Posted by dylan323i View Post

Found some people having this issue with Intel CPU's in general, I guess the POS drivers intel uses throw false audio signals causing the TV to think there is audio "in these here hills" (Lol) so it tells analog to piss off because it's busy. So not really sure how to fix that. I thought of cutting the audio pins or wire in the HDMI cable but I guess that connector is not that straight forward (Like anything in this problem has been straight forward lol) so IDK.

You can't cut the audio pins/wire in an HDMI cable I'm afraid. The audio is carried on the same pins as the video and in the gaps between active video (i.e. video blanking period).
post #11 of 11
Are you trying to carry audio from your PC to your TV via HDMI or a separate analogue connection - this thread seems to imply you've tried both?

If you are using HDMI to carry audio from your PC to your TV then there are two ways this can work :

1. The GPU/Graphics card has an on-board HDMI audio device which appears as a separate sound output (this is common on current nVidia and ATI graphics cards, and also with Intel Integrated Graphics since at least Clarkdale) You often need to ensure you've got the right audio drivers for this (they are NOT the same audio drivers as your motherboard on-board audio which handles analogue and SPDIF Toslink/Coax output in most cases). Early versions of this carried only 2.0 PCM and DD/DTS over HDMI. Current solutions carry HD Audio bit streamed (True HD, DTS HD) and multichannel PCM (>2.0). You obviously need to ensure you have enabled the HDMI audio output in Sound Control Panels in Windows.

2. The GPU/Graphics card (and I believe in some cases on-board integrated GPU) has no internal HDMI audio device, but has an input that will accept SPDIF (i.e. 2.0 PCM or DD/DTS) audio and insert it into the HDMI connection. This is usually a 2-pin SPDIF connector on the graphics card, which needs to be connected to a motherboard or sound card SPDIF output (also usually a 2-pin connector), or possibly a back panel SPDIF coax output via a converter cable looped back into the PC. For this to work you would also need to enable the SPDIF audio device associated with the feed you are sending to your graphics in the Sound Control panel. This was the route nVidia initially took for their early HDMI output graphics cards (ATI were a bit quicker to integrate on-board HDMI audio devices on theirs ISTR) NB the feed to the card must be a digital SPDIF output from your sound card or motherboard - analogue won't work.

My advice, if you have 2. and can't make it work, is to replace your graphics card... You can get very low-cost recent nVidia cards with on-board HDMI audio devices for a very low cost these days - and with the right drivers they will give you full HDMI audio with no problems...

However I note that you are also trying to use the HDMI output of your card converted to DVI-D to feed into your TV, and then to feed analogue audio separately?
For this approach to work you'll need to enable the right audio output in your sound control panel, and potentially disable any HDMI audio insertion in the nVidia drivers or config (if you had enabled SPDIF insertion previously)? I doubt this is anything to do with having an Intel vs AMD CPU - as you aren't using any of the integrated video or audio facilities on an Intel CPU are you (from Clarkdale onwards many Intel CPUs have had on-board GPUs and HDMI audio devices on the same die, and latterly the same bit of silicon, as the CPU) If you are convinced your TV is thinking it is being fed HDMI audio with silence and is ignoring the analogue audio inputs AND you have ensured you've enabled the audio inputs (on some TVs you have to map which DVI, VGA or HDMI input the analogue input is associated with - as many have just one analogue input that you might want to link to a choice of video sources) then you might try changing the output resolution of your PC to a non-TV format (as some HDMI systems won't insert audio in non-broadcast formats). You could try 1366x768, or even 640x480 to begin with when you are troubleshooting!
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