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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Fri Aug 02, 2013 3:41 am Post subject: No sound on my new(old) plasma tv... |
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So, I bought a nice new(to me) Hitachi plasma. It was installed with an outboard receiver being used for all sound, I didn't even think to check the "onboard" sound was working considering the class of install this came out of...
So I get it home and it won't put out sound from anything I try it with...
Any idea where I should look ?
I've checked the obvious culprits, yes the internal speakers are turned on, and I hooked up my phone to the analog inputs, so I tested it with a source I knew was putting out a signal, but still nothing...
I've also tried it with HDMI and other signals, and not received any sound from any kind of input....
Is there some service menu setting the installer might have used to turn off all internal sound processing ??
I've looked through the service manual(its posted online) and haven't seen ANYTHING that even refers to the sound...
The model of tv is an 55HDT79 Hitachi, a very nice looking tv, I just wish the sound would work...
Thanks.
PS: I know its the crt forum, but this is the only place I know of where REALLY knowledgeable people hang out...
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Fri Aug 02, 2013 6:33 am Post subject: |
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Was it an optional thing to buy without sound? A couple Panasonics came out here that way.
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Fri Aug 02, 2013 7:59 am Post subject: |
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I'm sure that's possible, but I haven't found anything to indicate this one doesn't have the capability. And when I switch inputs and such, there's a "thump", like sometimes when you switch inputs on a receiver, coming from the tv. In other words, there seems to be speakers physically installed in it, and they seem to be hooked up to an amplifier at least...
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Fri Aug 02, 2013 8:41 am Post subject: |
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What does it do when you wind the sound up to max with it set to an analog input? Is there a very faint white noise?
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Aug 02, 2013 1:10 pm Post subject: |
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I've got two LCD sets right now, a 52" Vizio and a 40" Samsung, both very late vintage where the audio section is completely dead. the chips and circuits are so tiny that it's not worth repairing, I pull the back off both and c-a-r-e-f-u-l-l-y put them back on. 
In the older plasmas though, it should be easier. Follow the speaker wired back and see if there's a tiny fuse that drives just the audio section. Short of that, all you can do is scope the audio path to see if you find out where it's died.
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Fri Aug 02, 2013 3:47 pm Post subject: |
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| CasetheCorvetteman wrote: | | What does it do when you wind the sound up to max with it set to an analog input? Is there a very faint white noise? |
Yes, there is faint white noise, and when I hit "Mute" the white noise goes away. I'm fairly sure there IS sound amplifiers and speakers installed, it just seems like the tv won't output any sound...
I've perused the service manual in hopes of seeing a setting accessible only via the service menu that turns the sound on or off, but didn't recognize anything that would indicate that...
Google doesn't turn up this as being a common enough problem that I've seen even a single post/comment about it...
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Fri Aug 02, 2013 3:51 pm Post subject: |
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| Curt Palme wrote: | I've got two LCD sets right now, a 52" Vizio and a 40" Samsung, both very late vintage where the audio section is completely dead. the chips and circuits are so tiny that it's not worth repairing, I pull the back off both and c-a-r-e-f-u-l-l-y put them back on. :)
In the older plasmas though, it should be easier. Follow the speaker wired back and see if there's a tiny fuse that drives just the audio section. Short of that, all you can do is scope the audio path to see if you find out where it's died. |
Thanks for that lead Curt, without pulling anything apart just yet, are audio sections typically a separate board that I could just get from ebay ?
This is a fine looking set, but considering how little one need spend on a new one, its not likely worth spending more than about $50. to repair, the oft repeated conundrum...
PS: Curt, do you have access to any recycling depot's ? I've found they are a treasure chest of electronics, many with very, very, VERY minor issues, often with no issues at all !
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Aug 02, 2013 5:02 pm Post subject: |
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Yes, I've given recycling depots about $10K in the last 4-5 years. Lots of crap, I've gotten very selective, but lots of good stuff too!
No, the audio board is usually part of the main CPU board. Just follow the speaker wires back to whatever board they go to, and that's where the issue is. Plasma is about dead in the water anyway, unless it's a 1080p set, so I'd do the external amplifier thing.
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Tinman
Joined: 09 Mar 2006
Posts: 1326
Location: Carson City Nevada
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| Posted: Fri Aug 02, 2013 6:15 pm Post subject: |
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Make sure you also select the right audio source in the audio menu, not just the speakers on/off.
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This space for rent.
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Sat Aug 03, 2013 6:25 pm Post subject: |
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| Tinman wrote: | | Make sure you also select the right audio source in the audio menu, not just the speakers on/off. |
Ok, maybe I need some splainin on that one...
There were some options I didn't necessarily totally understand why one would have to choose them in the Audio menu...
Like it wanted me to pick if the source was Stereo, Mono, or SAP ?? Why would I ever have to choose that ? Also, I was wondering what kind of choice to make on the players HDMI audio output choices...Do I choose SPDIF ?
Gone are the days of just plugging in the cables till sound comes out....hahaha...
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HD-DAVE
Joined: 16 Feb 2007
Posts: 225
Location: Delta, BC
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| Posted: Sat Aug 03, 2013 11:06 pm Post subject: |
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Make sure whatever you are driving it with is not set up to strip the audio out of the hdmi if that
Is how you are conne ting it. Many pvr's , bluray players etc have the option of
Not sending the audio along if the user wants to send the audio optically or coax
To an older non hdmi 7.1 receiver for external decoding and amplification
Good luck !
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mx83toy
Joined: 14 Dec 2012
Posts: 322
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| Posted: Sun Aug 04, 2013 11:49 pm Post subject: |
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maybe a HV fault have you checked the splitter???
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Tinman
Joined: 09 Mar 2006
Posts: 1326
Location: Carson City Nevada
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| Posted: Mon Aug 05, 2013 4:10 pm Post subject: |
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| mx83toy wrote: | | maybe a HV fault have you checked the splitter??? |
For no audio???? On a plasma tv??? Did you READ this thread?? 
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Mon Aug 05, 2013 10:14 pm Post subject: |
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All this effort for a 720P flat screen 
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A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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mx83toy
Joined: 14 Dec 2012
Posts: 322
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| Posted: Tue Aug 06, 2013 12:14 am Post subject: |
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| Tinman wrote: | | mx83toy wrote: | | maybe a HV fault have you checked the splitter??? |
For no audio???? On a plasma tv??? Did you READ this thread?? |
LoL was kinda making a joke....
*** Did you READ where you posted the question??***
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Tinman
Joined: 09 Mar 2006
Posts: 1326
Location: Carson City Nevada
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| Posted: Tue Aug 06, 2013 4:29 am Post subject: |
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| mx83toy wrote: | | Tinman wrote: | | mx83toy wrote: | | maybe a HV fault have you checked the splitter??? |
For no audio???? On a plasma tv??? Did you READ this thread?? |
LoL was kinda making a joke....
*** Did you READ where you posted the question??*** |
Well, yeah... I downloaded the user manual for that plasma and it also mentioned 3 audio source selects in the Audio menu.
I actually wondered if you replied in the wrong thread by accident with a classic CRT problem. 
Boy do I remember when my first HV splitter gave up the ghost. Scared the crap out of me! Was a Hitachi RP set.
Shame... it had a really good picture, but the part was NLA.
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Tue Aug 06, 2013 5:01 am Post subject: |
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Have you tried a factory reset?
SC
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