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No audio suspect main board i did not check if audio was present with headphones

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  • Polaroid Master
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It's always a good idea to start checking the simple things. Also make sure mute isn't on, and that (if applicable) your internal speakers are enabled. Some sets will give you the option to disable your internal speakers.

Posted on Nov 06, 2012

  • joe kuhn Nov 06, 2012

    i am disabled for the last 10 yeaRS I WAS IN T.V. REPAIR FOR 25 YEARS HAD TO STOP DUE TO DISABITILT I SPECLIZED IN PROJ T.V. TO COMPONENT LEVEL UP TO ANDINSTALLING IC S AND P C MOUNTED I CS THIS IS MY NEIGHBOR I HAVE NOT TOUCHED A T.V SINCE THEN CTC160 AND 200 SERIES SPECIALIZING IN HITACHI AND MIT. WHAT IS GLOBAL VOLUME LOCK AND I DID NOT SEE AND INT EXT SPEAKER ADJ HE HAS NO REMOTE SO ITS A PAIN USING THE SIDE BUTTONS.

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Posted on Jan 02, 2017

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LG 55LS4500 55 in. TV has sound through speakers, no audio except a hum from headphones and the optical digital to analog output fiber lights up but no sound output What board is bad?


Hi Louis,
The audio circuitry is located in the main board. Try unplugging the TV for a while and try again if the audio comes back.
I would suggest to check all your settings in the audio section first and if everything seems OK then the main board should be replaced.

Feb 26, 2017 | LG 55LS4500 55 Inch 1080p LED LCD HDTV -...

1 Answer

LG LED TV. 50LN5700UH. Picture out. It will flash LG Logo on power up then go black. Image is present by flashlight test. Audio is also present. Power LED is also lit.


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electro-medical.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Jan 02, 2017 | LG Televison & Video

1 Answer

No sound on my technika 42" 3dtv


If the headphone jack socket works the audio output for the set is good, I suspect a dvd etc will also work if connected to the rear input audio and video jacks.

This does not leave too much, headphone jack dirty or defective, speakers for whatever reason are switched to off in the main menu.

the sound for the headphone socket if it is built into the set is the same audio going to the speakers.

Dec 05, 2012 | Televison & Video

1 Answer

No sound on Hisense LTDN24V86US 24 LCD TV. Tried headphone jack still no sound.


this company has went out of business at least 2 times--They are in China and parts are for the most part non-existent.


Likely that problem is on main board (the large and most expensive board in the set.

A simple check to see if sound is present when using a DVD etc also will confirm if via rear jacks if problem in set or not.

May 30, 2012 | Televison & Video

2 Answers

Zenith z50pg10 its dead no click, no led blink nothing !


Zenith Flat panel TVs usually only have two boards in them Plasmas have a few more, doing a visual inspection of the power supply capacitors usually reveals swollen or bulging capacitors.
If the capacitors look good, voltage checks would be needed to isolate the problem to either the main board or power supply. Check for 5 volts to the IR board (& or keyboard) , if five volts is present suspect the main board
If this TV has voltages from power supply , suspect the Z, X and buffers

May 26, 2012 | Televison & Video

1 Answer

No output audio


Please check the audio with an headphone as if present then the laptop speakers can be faulty. If not the failure of the audio preamp or op amp is to be checked on the main board. If the PC functions well also check the properties of the audio drivers, reinstall and check for any fault.

Apr 09, 2011 | Toshiba Satellite A135-S4527 Notebook

1 Answer

I got my computer 10 months ago and everything was working then my volume stop working. I could only hear stuff if i used my headphone and that went on for about 3months . Then i moved the computer to...


You will have to check for a possible loose connecction in either the earphone socket or the audio amplifier within the main board - audio section.
It is possible that while using earphone jacks the socket can be damaged over a period of time , there is a cut off of main speaker when headphone is used and releases when taken out.
So check here for audio , if not solder the Audio IC or connectors.

Sep 16, 2010 | HP W2338H Monitor

1 Answer

I have Mackie mixer cfx12 all the channels work except for channels 2 & 3, I turn the pre amp trim pot all the way up but no input is present, I also tried solo PFL for these two channels and no...


I suspect one of the upfront IC amps has been damaged. This can happen if people power the mixer from a receptacle that is different from where other connected equipment is powered such as amp. For example, mixer is at one end of the hall and other inouts such as an output of a guitar amp is plugged in. If a ground fault or spike occurs, teh ground bounce can exceed the common mode voltage of the input amps.

In your case, the inpout amps are discrete transistor types.

A voltage surge into the inputs of your unit would LIKELY pop two bypass caps that are 330pf. For channel 2 these are C205 and C206. Check those for shorts.

VERIFY audio is available at the "send" (tip) of the channel insert connector... this verifies the preamp stage. You can PROBABLY plug a set of headphones in to check this... ONLY one side will have sound of course. Verify this is a good test by checking a working channel. The level will be quite low and we are looking for just some signal.

IF you do have signal on the channel insert send which is the "tip" of the channel insert with the trim turned up, let me know and I will check the schematic for the next thing to check farther down the line.

Sep 15, 2010 | Mackie 1604 Vlz3 16 Channel Mixer

1 Answer

Samson 3o1u has a delay in my headphones


The delay is due to the time it takes to digitize the audio and pass the data through your computer to the audio board.

Depending on your system and software, you MAY have a setting for ECHO which loops the sidetone directely to your headphones so the delay isn't present/

Sep 14, 2010 | Samson C01U Consumer Microphone

1 Answer

My self diagnosis problem. (standby)imdicator is flashing in red,six times between two second break ??????


Information from Sony:
Audio Output Error (6X)
There are three possible failures that can cause a 6X protection mode, and they are as follows.
Short Audio Amplifier Outputs
Lose of 15V Supply
Lose of 9V Supply
The key to determining what to check first is if audio is heard before the TV shuts OFF.
If audio is heard before the TV shuts OFF, then the next step is to check the 15V supply at CN7503/pin 1. If the voltage is missing replace the G1/G2-Board. If the voltage is present, first check the fuse PS7001 for a possible easy fix. If the fuse is OK replace the AU-Board.
If no audio is heard before the TV shuts OFF check for 9V at CN9502/pin 1.
If the 9V is missing replace the BU-Board. However, if the 9V is present check and confirm that the protection circuit output voltage is making it to the Main Microprocessor IC1001/pin 26. If 2.8V is present at IC1001/pin 26 then the Main Microprocessor is defective. Replace the BU-Board. If the voltage at IC1001/pin 26 is 0V then the audio output circuit has actually failed. In this case, replace the AU-Board. A shorted audio output or a DC voltage level measure across the audio output will cause a 6X protection mode indication. In either case the problem will exist in the audio circuitry on the AU-Board.

May 24, 2010 | Sony BRAVIA KDL-40V2500 40 in. LCD HDTV

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