Question about Philips 27PT543S 27" TV

1 Answer

No sound, no supply B+

No power to audio ic

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  • hearingtears Feb 12, 2009

    philips 27PT54 no sound...perfect picture what happened?

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Check for either an open resistor in the B+ line that feeds the audio amp IC or remove the IC and check for B+. If the IC is shorted, the B+ reading will read low.
Dan

Posted on Mar 18, 2008

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Cdx gt630u


hi rohan, which ic is it?? sound ic? power supply ic? control ic? preamp ic? tuner ic? plz send more specific details? plz send picture of the ic placed in circuit?

Sep 07, 2013 | Car Audio & Video

Tip

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.

on Mar 21, 2011 | Televison & Video

1 Answer

I have picture but no sound not even at the jack


This means that there is no audio output. so you will need to check the audio amplifier for the supply voltage to the IC. If absent check the power supply section for a possible fusible resistor that is open.
If there is supply to the amplifier, then check for audio signal to the input of the IC, make sure the speakers are wired and working. If a signal injected gives a audio output the fault can be in the front end - check the SIF and preamp sections.

Feb 05, 2011 | Televison & Video

1 Answer

I have an rca ctc186/7 series tv and it has no sound. We tried cleaning it, hooking other speakers to it and hooking up a dvd player and still no sound.


Hello

The audio output Ic inside your tv has damaged, or it doesn't get proper voltage. You just open your TV, and locate the audio output Ic. It can be located by following the speaker wires. Usually it will be screwed onto a heatsink. Check the input voltage with the help of a multi meter, af it is there, the Ic is damaged. Replacing it will solve the problem. If there is no voltage, follow the supply track and find out the opened circuit point. Usually a small value resistor, say 0.01Ohms in value, will be connected in series with the power supply to Ic. If it gets opened, there will be no supply to Ic, resulting no sound. If the audio outpu Ic get short this resistor will open. So keep in mind that, if this resistor is opened, there may be a short inside the output Ic, or come capacitors fitted with this supply line, after the reistor. Check the also for any short. keep a keen look at the solderings fo the leges of this output Ic. Some loose, or bad solderings also may be there. Anyway, your TVs audio output section is faulty. Find the reason and rectify it. If audio Ic is found defective, desolder it out from the board, and replace it with a same type and number. Ok

Gopakumar. India.

Nov 21, 2010 | RCA Televison & Video

1 Answer

My Samsung hdtv rear projection tv model#HCM4216W doesn't have any sound good picture though but does have some light waves in picture


the lack of sound is likely due to a defective audio output amplifier integrated circuit or IC for short, it needs replacing, the wavy lines through you picture is due to a defective filter capacitor in your power supply circuit, or may be due to the audio amplifier I.C drawing more current from your power supply causing a non clean power to be supplied to the video circuits, have the audio amp replaced first and note if the wavy lines are still present if so it is likely that some filter capacitors need replacing, to obtain sound you might be able to connect a external amplifier like your home stereo using the aux input and the sound output from your TV`s RCA jacks, this works well, let me know if you need further assistance good luck

Apr 27, 2010 | Samsung HCM4215W 42" Rear Projection...

1 Answer

No sound from my NAD C325BEE amplifier


audio ic problem or component around audio ic.. good luck

Apr 26, 2010 | NAD C325BEE Amplifier

1 Answer

Don't have any sound


If the picture is available and no sound, the trouble could be from speaker audio power supply or Audio IC. Check all the audio components. Check the sound mute status before replacing IC

Apr 09, 2010 | Sylvania 6427TE 27" TV

2 Answers

No sound from internal or external speakers


Defective audio output ic is most likely the problem

May 04, 2008 | Televison & Video

1 Answer

F61 problem


DIsconnect sound Amplifier ic (RSN).After removal of the ic if the unit works o.k offcourse without sound than replace ic.If still f61 than sound ic is o.k and check voltege regulators in power supply.You can check dc detect line if it gets activated.
F61 is mainly two resons 1st sound ic or power supply problem in power bord which send signal to system control to shut down the power in order not to damege more.

Dec 13, 2007 | Technics SC-EH780 CD Shelf System

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