Tip & How-To about Televison & Video

No sound, video OK in TVs

PICTURE IS OK AND THERE IS NO SOUND IN tvS

There are some occations arise when picture in a TV will be OK while absensce of sound.
Picure is OK, means that, functions from tuner upto video output, including power supply are OK. In most cases absence of sound may be with the fault to its speaker or speakers. In some sets there will be two speakers connected in series connection, and its sound output will be MONO. In these type of sets, if the connction is done as above, even one speaker has gone out [that is its voice coil or its connection gets opened, both speakers will not work]. In this case, you have to check each speakers individually for coil conitnuity, and the faulty one must be replaced. If there is no fault to the audio amplifier section of that TV, the problem will be solved with this.
In stereo sound system TVs, two of its speakers will have individual amplifiers, some may have both amps sections are integrated in one IC or two ICs are used seperately for each channel. In this type of sets, absenece of sound can be either to the fault of the failure audio output IC or its supply line voltage. In most cases, you can make sure the reason with a simple test without opening the set. Place your ear very close to its speaker side, and switch ON the set by its front panel power control switch. if a "Thumb' sound is heard form the speaker, you can confirm that the speaker is OK, and the power supply is comming to the output IC. If so, check the output IC terminal solderings for some loose contact. During long run, this may happen because, the Audio Output IC will heat up during working, and repeated heating and cooling may make loose soldering at its terminals; or a loose fixation of the IC to its metal heatsink, will relult overheating the IC. In most cases this is found a common fault. To rectify this, you have to open your TV, and pull out the audio output card, in some sets, this audio output section swill be built on the main board itself, place it upside down, and resolder all the terminals of the output IC by applying a little more solder, without making any solder bridges in between terminals of the IC. If this also doesn't help you, check the input voltage of the audio output IC. In most sets there will be a fuse resistor used as protection, will be in 0.2Ohms in value, and will get opend thus disconnect the supply; if IC has some fault. This will happen when the output IC itsef get shorted. If you see this resistor opend, check the output ICs positive supply rail terminal to the negative terminals' resistance with the help of an Ohm meter, if foud very low, say between 0 Ohms and 5 Ohms, make sure that the IC has got damaged. Here you have to repalce the IC and this fuse resistor too.
When replacing the audio output IC, make sure to apply thermal conductive paste, in between IC and it heat sink. This conductive paste can be bought from most of the electronic spare part selling shops at your town.
There is an other possibility too, is, the audio filtering stage in the video IF stage get faulty. To detect this, you have to go to the VIF section, and it is a skilled job, and the worker must have sound knoledge in electronics, and service experience.

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In Samsung tv complaint<br/>in first time tv working in normal and after sometime picture is blinking and slowly no pictre. that time sound is also ok.<br/>after that am am change the capa


Check its solder terminal at the CRT board [Filament voltage]. It sounds like the filament do not glow after some time due to a loose contact at the CRT base connector sockets. Check it.
http://electronicshelponline.blogspot.com/
If this does not help, check the ABL circuit for any open resistor.

Oct 25, 2014 | Televison & Video

1 Answer

my tv has no picure but it has sound. plus, we're able to watch movies on blueray and the picture shows on the tv.


sounds like input problems, if its working with your BR hit the source or input button on your remote and toggle the inputs until you find your cable input its probably going to be hdmi or component

Jun 06, 2011 | RCA Scenium HDLP61W151 61 in. HD-Ready...

3 Answers

Are ther advanced setting for my samsung pn64d8000 tv?


Hello,

Unfortunately, the answer is no. Samsung pn64d8000 TV does not have any advanced settings.

I hope this is clear. Please let me know if you have any more questions about this TV.

Regards.

Apr 30, 2011 | Televison & Video

1 Answer

no sound


Hello
You haven't mentioned about the picture at all. Assuming that, picture is ok I suggests. Ok
If the picture is Ok and there is no sound output from the speaker, your TV has either speaker problem or output Ic problem. To assure where is the fault, you just place your ear very near to the TVs speaker side, and switch on the TV. If you hear a "thumb" sound or a "HUM" sound, your TVs output ic has blown out. If you did not hear any sound at all, the speaker of your TV has gone.
If you have a little knowledge in electronics, you can do it by yoursef. This is a minor mistake. Opwen the back cover of your TV, locate and note the type and number of the audio output Ic, go for that and get it replaced; if the fault is related to Ic. You can do the speaker replacement also by this way. I have given this much advice, assuming that picture in your TV is Ok. Otherwise the fault may be different.

Oct 20, 2010 | Bush Televison & Video

1 Answer

No sound at all!


I agree with everything that they are saying.
Most tv companies under design the cooling needs of the flat panel TVs. I had to fix a few TVs this way that had similar problems. Mostly with the picture on TVs freezing up because of the poor cooling design for the motherboard processor. I would give their solution a try before replacing circuit boards.

Jun 10, 2009 | Sharp LC-26D6U 26 in. LCD Television

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