Question about Akai PTH5498 54" Rear Projection HDTV-Ready Television

1 Answer

No Sound Picture is ok but there is No Sound. The output IC was replaced but still no sound. Help is highly appreciated.

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  • crv183 Oct 01, 2007

    First of all, I checked the speakers if they're ok and it checked fine. Secondly I checked the Vcc of the Output IC(TDA 8172)if present and it's 0V. So I replaced that IC then I now have the Vcc. But I don't see audio signal coming out at Pin 5 and 9 of CN801(Sub-Sound Ass'y.) But using the RCA Audio Output Jacks of the Unit I'm getting Audio and I used External Amplifier just to get Sound. Is it possible that the Sub-Sound Ass'y. part # AA95-01868C is defective? I don't have the schematic diagram that's why I can't troubleshoot this TV. HELP!

  • crv183 Oct 01, 2007

    Akai Projection TV, Model# PTH5498 has no Sound but Picture. Speakers are OK, Replaced Audio Output IC with no Vcc, now I have Vcc but still same problem. No audio signal is fed to the input pins of the Amplifier IC(TDA 7265 that comes from pins 5 and 9 of the Sub-Sound Ass'y.CN801. I don't have schematic diagram. Is the Sub-Sound Ass'y bad ? Part# AA95-01868.

  • crv183 Oct 02, 2007

    all components within the Amplifier circuitry were checked, all are ok, I scoped the inputs of Amp. IC(TDA7265) and there's no input signal going in. The audio signal should come from the output pins 5 and 9 of the Sub-Sound Assembly(CN801)but nothing. I was wondering if you ever changed this part "Sub-Sound Ass'y". before, Part# AA95-01868C with Sound problem.I am tracing the audio signal with my oscilloscope and I lost it at Pins 5 and 9 of CN 801 or the Sub-Sound Ass'y.i need schematic Diagram can anyone provide me ?

  • crv183 Oct 02, 2007

    What is the location number of the "Jungle IC" ?

  • crv183 Oct 02, 2007

    I don't see any connection between the chroma IC and the sound. I don't have the schematic diagram. As far as I know chroma is for color and I don't understand the relevance of replacing the chroma IC if there's no sound. Perhaps there's an audio input pin and audio output pin in the chroma IC or it has internal mute circuit in that IC that I never encountered in my entire life as a technician. Anyone has a service manual for this Model, PTH5498 ?

  • crv183 Oct 03, 2007

    In regards to the regulators, these are the second ones I checked after checking the speakers. That includes the supply or Vcc of the amplifier IC(TDA 7265), so I know that I did'nt miss those things. My concern is the Sub- Sound Assembly where surround sound is being processed and where the main L&R output is coming from that is being fed to the inputs of the output IC(TDA7265). I hope you have a way of sending me the schematic diagram just the signal board assembly portion and it definitely make my day. Thank you and I appreciate your enormous effort in helping me. I'll be waiting for more technical help from you.

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  • 790 Answers

Check the speakers!!! or maybe you have defective parts like fusibul resistors! or open capacitors...

Posted on Oct 01, 2007

  • 3 more comments 
  • carlos fernandez Jr.
    carlos fernandez Jr. Oct 01, 2007

    check all zener diode at the amplifier section.. maybe you have short zener or open zener.

  • carlos fernandez Jr.
    carlos fernandez Jr. Oct 02, 2007

    ok base in your comment you have signal from the input sensitivity!? right? if you have input signal... your problem is in the jungle IC there is no sound signal output! trace the circuit! maybe you have defective resistor! or open capacitor!

  • carlos fernandez Jr.
    carlos fernandez Jr. Oct 02, 2007

    check the jungle IC! and try to replace the eprom memory IC!

  • carlos fernandez Jr.
    carlos fernandez Jr. Oct 02, 2007

    jungle IC Chroma IC is one!

  • carlos fernandez Jr.
    carlos fernandez Jr. Oct 02, 2007

    ya the chroma is for the color but sometimes the chroma is attach in the jungle IC! i know you know the system IC? that is connected at the jungle IC! and then check the voltage of the jungle IC if 5V ia good! but if its over in 5V thats is abmnormal you can change the 7805IC if over voltage. or you have defective eprom memory IC try to actual the memory IC.

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1 Answer

No sound picture ok powar ok sound ic over heat


You Answered Your Own Question...., Your Audo IC Needs Replacement..Your Sound Level Was Perhaps Too High...

Jun 28, 2014 | Televison & 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.

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1 Answer

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I would check the solder on the Vertical output IC as ofetn the soolder will crack and the CRts will shut down to prevent damageing the CRts when vertical drops out. If the solder looks good I would try replaceing the vertical IC very inexpensive and you can get the vertical IC from www.tvrepairworld.com

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1 Answer

Philips 30PW My 30PW has no sound, it just stopped working while it was running. I have been through the menu 500 times and cant sort it out. Help!!


Hello
You haven't specified nothing about the condition of picture. Picture of your TV is good; and only sound has trouble, I assumes and posts this solution.
If picture is good and there is no sound output from its speakers, check first whether the sound mute function is on or off. It must be OFF condition to get sound from your TV. If it is in off position, and still there is no sound at all, just place your ear very close to the speaker powition of your TV and switch it ON by its front panel power switch, not by the remote handset. Check whether there is a 'thumb' sound is heard from the speakers. If it is there, speakers are OK and the sound output IC inside your TV is fauty, and should be replaced with same type and number.
If the sound detection section of your TV is faulty, there will be no sound. To detect this, connect your TVs audio out sockets at its rear side, to any external sound source like amplifier or so, and check the sound is there or not. If it is there, make confirm that the sound output IC itsef has failed.
Open your TV, locate the sound output section, pull out the printed circuit boar, and resolder most of the soldering points around the sound output IC, by applying a little more solder. If the fault was due to solder loose or bad soldlering, thie will rectify the fault. Keep attention to the pins of the IC while soldering, not to make any solder bridge short between them.
Also check the setting of sound system. If your TV is a multisystem one, make the system selection to auto, by surfing through its menu. If you wants furthermore assistance, get me through Fixya. OK.

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1 Answer

TV has no sound


Hello

You haven's specified nothing about the picture. Picture is Ok and there is no sound I thinks and posts this solution

Either your TVs speaker or its sound out put ic has damaged. To check it and conifrm you just do this first. There is a stero headphone socket on the front panel of your TV. Insert a headphone pin inot it and listen whether there is sound output come ffrom it or not. If there is sound output from the headphone socket, and not from the speaker, be sure taht the speaker is out.
If there is no sound output from the headphone socet, wither your TVs sound output ic is damaged or it doesn't get proper voltage to go on. It is very easy to locate this IC, as speaker wire goes directly to this section. Just follow the speaker wire and locate the IC, usually screwed on to a metal heatsink. Check its input voltage. If there is no voltage to that IC, check the track associated with that pin. If there is voltages and still not works. first resolder all the pins of that IC by applying a little more solder, whout shorting the adjecent terminals. If this does not helps, replace that IC with same type and number. OK.

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1 Answer

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Hello
Either your TVs internal speaker or its sound output Ic has damaged. You can make sure about which part is damaged through the following sugession.
Just place your ear, very close to the TVs speaker side, and switch on your TV with its front panel power switch, not by the remote control. If you can hear a 'thumb' sound or 'HUM' sound, you can make sure that the speaker is ok. If you hear a 'HUM' sound as describe above, make sure that its sound output Ic has damaged. If the sound output Ic has damaged, sometimes you may not hear any sound at all too.
Connect the TVs audio out RCA scoet to an amplifier, if you have, and try to get the sound through it. If there is sound through an external device, make sure once again that the internal sound output Ic has damaged. Speaker can be checked by a torch cell, connecting its terminals to the two leads of the speaker, with two pieces of wire, just intermittent touch, you can make sure that it is ok or not.
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Before replacing the Ic, just measure whethere there is voltage comes to its supply terminal or not. If there is voltage, and no sound at all, replace the Ic with same type and number without any doubt.
If there is no voltage comes to the input pin of that Ic, check the track leading voltage to that point, and find whether there is any resistor has opend or not. Ok
If you need any further assistance, contact me through Fixya.
OK.

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1 Answer

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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.

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1 Answer

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Hello
There is no sound you means? If so what about the picture? If picture is ok and there is no sound either the speaker of your tv or audio output Ic inside your TVs circuit board is faulty.
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1 Answer

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