Question about RCA L42WD22 42 in. LCD Television

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Sound is staticy for both internal speakers and external speakers through the headphone jack

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Let verify first to narrow down to where the problem can be, attach the powered PC speakers to the Audio Line out RCA jacks to see if you can get the sound there, if you do, then the problem can be in the power amp circuits, if you do not get the sound at RCA jacks, then the problem can be in the sound processor circuit. Please post back what you find. You may be better off if the sound does work through the PC speakers, to get the TV repaired; it will be more than $100 and up.
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Posted on Jul 08, 2010

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Generally when the head phone jack is inserted the speakers will get disconnected automatically.

If you are going to use external amplifier you can try the AV sockets. Opening the TV you may require the special screw drivers some times.

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No headphone sound, but internal speaker works fine.


Hello,

Hello,

It is because that your internal speaker is the default play back device other than your head phone or external speaker.

Need to go to your sound setting.

Depend on your operating system, click Start, then click Control panel, then click Hardware and Sound, click Sound.

Under Playback tab, select your external speaker or head phones as default device.




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My external speakers wont switch off when I plug a pair of headphones into the jack


first u are talking abt en u internal spekar when u plug headphone or speakar did the both spekar ply the sound i mean internal & ext. (problem in your head phone pin or in jack which not push the jack properly) or jack pin touch cutoff pin check it

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Why does my I-mac not recognise both internal and external speakers in the sound preferences, so that I can switch between the two without having to unplug the external speakers from the headphone output.


There is an internal switch inside the actual 3.5 mm headphone/speaker jack. When you have either headphones or speakers plugged in, it automatically switches to external. FYI: Macs are also notorious for getting 'stuck' in this mode (external) and I've had to walk numerous people through the steps to correct this. My Macs are definitely not excluded :) I hope this helps.

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Sound is working but internal speaker is not working


Connecting headphones to the system will disabled the internal speakers until the headphone jack is disconnected, at which such time the internal speakers should function again.

If you disconnect the headphones and the internal speakers are not re-activated, then there may be damaged to the microswitch in the jack. (Try rebooting after the headphones are disconnected too)

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It sounds like the audio jack itself has internal damage. Depending on how it is mounted on your laptop case, or possibly on an internal circuit board inside the laptop; it might be possible to repair the jack or replace with a new 1/8" audio jack. Some soldering skill may be required after disassembling the laptop and getting access to the jack.

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1 Answer

Can't mute inbuilt speakers


That is not a software problem.
The headphones/external speakers jack socket has a switch to exclude from audio the internal speakers, when a jack plug is connected.
This is a very simple device and is not software controlled.
The fact that it has gone faulty at the same time you reinstalled the system is a coincidence.
If it does not mute when you insert headphones, all you can do is trying to play with the jack plug , inserting and pulling it out. If this does not unlock the switch, the alternative is having the jack socket replaced by a technician. This is generally an expensive repair, asthe socked is soldered on motherboard.
A cheap alternative to a proper repair is using an external USB to Audio Adapter and mute the internal audicard when using headphones.

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1 Answer

Looking for a schematic diagram


It would be less trouble to disable the internal speakers from the television's setup menu and connect to a set of powered speakers or a receiver using the built-in audio outputs. It will be a challenge to get good sound quality and levels from the headphone jack.

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