Question about RCA F25305 25" TV

7 Answers

Souns goes off only in channels 20 to 29...

If listenign the channels 20 to 29, sound goes off after 5 to 10 minutes. After unpluging and repluging the TV, it's OK but goes off after 5 to 10 minutes. I tried all the audio settings (mono, stereo, etc) and still having the problem. I don't have sound problems with channels lower than 20 or higher than 29.
Anyone has a clue???
Thanks

Posted by on

  • 3 more comments 
  • Andre Taillefer Sep 26, 2008

    I tried what was posted yet and nothing helped... yet!!

  • Andre Taillefer Sep 26, 2008

    The only help I got didn't help. Any more ideas??

  • Andre Taillefer Sep 26, 2008

    I'm a technician so I could try to change parts but I first wanted to hear from experts on what to change. To answer some questions: I tried another TV on the cable and I didn't have the problem so I'm sure it's the RCA TV that is defective. I did contacted TV Repair center, in my region, even centers that are "specialised" in RCA TVs ans they told me that they are sure that it's not a "parts" problem but a programming problem. Thay said that after many years, the TV seems to partly "deprogram" itself.
    Is it possible???

  • Andre Taillefer Sep 26, 2008

    Benimur is asking to unrate his comment but I just don't know how!!

  • Andre Taillefer Feb 22, 2009

    Nothing from what was porposed was helpful. Keep in mind that the TV is directly connected to the Cable and tried at 3 different places. The TV is at the repair center for the last 4 months and nothing tried helped yet. I''m hoping for some suggestions from someone who encountered the RCA sound problem before (I heard it's a known problem).



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7 Answers

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  • 171 Answers

These are the parts and symtoms relevent to your issue.

RCA
CTC203
INTERMITTENT AUDIO
CHECK SOLDER CR11603 SMD DIODE

RCA
CTC203
INTERMITTENT AUDIO
CHECK PIN 49 OF U12100 FOR 3.4 VOLTSIF HIGH
CHECK LISTED PART CHECK C12309 (197600) CR12301 (227051) OR
ORDER KIT 237930

RCA
CTC203
INTERMITTENT AUDIO-MAY GO OUT WHEN CHANGING CHANNELS
UNPLUG SET FOR 10 SECONDS TO RESTORE AUDIO

Posted on Sep 29, 2008

  • 2 more comments 
  • Todd Gale
    Todd Gale Sep 29, 2008

    Legend



    RCA = Brand

    CTC203 = Chassis Model Number

    Problem Description

    Repair Part Number

    Repair solution

  • Todd Gale
    Todd Gale Sep 29, 2008

    You cannot un-rate, once you rate the solution. Nor should you,. If the persons solution was not helpful or did not solve your problem, rate them accordingly. The idea is to prevent those unqualified to offer answers to your problem from providing assistance that is detrimental or not useful to the requester.

  • Todd Gale
    Todd Gale Sep 29, 2008

    RCA
    CTC203
    No sound problems
    There is a SMD cap off of pin #1 of U12101(LA7612N) whose glue at times goes conductive-just lift it and clean the glue off
    Also check L12303

    Additional Chassis



    RCA
    CTC203CA5
    Audio missing or intermittent
    CR11603 pn 232709 an SMD on the power supply line for the audio circuit

  • Todd Gale
    Todd Gale Sep 29, 2008

    Here is a parts listing and price list for your Thomson/RCA Set.



    http://www.partstore.com/Model/Thomson/R...

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  • 208 Answers

Hi,

It may be because of the fact that some channels broadcast two different language options.

so check your SAP function probably under the AUDIO menu If your TV is set to SAP it could cause that problem.

Some channels use Spanish as Second Audio Program, some just repeat the normal audio, and some have no audio on SAP

If you can't find it in the menu check your owner's manual.

Also check your menu or a switch on the back of the TV for cable settings STD, IRC, HRC most cable TV is STD for standard.

If your cable box has an SAP function check that also, your cable company can tell you how.

Hope my info fix your problem,
Waiting for your response,
Thanx for using fixya.

Posted on Sep 26, 2008

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  • Master
  • 10,594 Answers

Hi,
What I understand with provided details, its problem of Acoustic Frequency Tuning (AFT)
I don't have schematics of this tv so can't provide specific part number but can give you an idea. Its IF stage problem and normally there is IF Box mounted near Tuner.
IF Box needs to be replaced in this case or TV Tech having good solder skills should resold all components on IF Board.
Regards,

Posted on Sep 26, 2008

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  • Master
  • 4,234 Answers

Since the sound recovers with the unplug/plug for a few minutes, and all other channels work as expected, the problem is not with the audio output section of the set. I would suspect the tuner at this point. The tuner works by locking on frequency with changing voltages. If one of the voltage regulator circuits is failing, the tuner may not be locking properly on frequency. This is a stretch though as I would have expected the video to be effected first. Another possibility is that the incoming signal is broken down in to an audio stream and video stream in side the tuner itself. Without having the schmatic in front of me, I can't explain why certain channels fail, but it is possible. Just to add more confusion to the mix, this unit has a CTC203 chassis which is known to have some odd problems. Also, this set has a Gemstar module which also can have issues. I will research this a bit more to see if there are inexpendive things you can try. The replacement tuner (247225) runs about $40.

Stay tuned...

Dan

Posted on Sep 26, 2008

  • ABRsvcs Feb 22, 2009

    Unless there are other symptoms that you can report, without seeing the actual TV, I'm not sure what else we can suggest. If I understand your last entry, the tuner was replaced with no change in symptoms. Is this correct? IF yes, then a close examination of the feeder voltage to the tuner should be the next step. As I stated before, the tuner works by changing voltage levels. The loss of sound only can be cause by being a bit off frequency. This can be caused by a bad tuner (not so here as already replaced) or by lower or higher than expected voltages presented to the tuner section. Please check that and get back to us.



    Thanks,

    Dan

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  • Master
  • 6,966 Answers

Hi,

If I may add with the indulgence of Ginko.

I am assuming that your post "...audio settings (mono, stereo, etc)..." includes turning off the SAP and/or the MTS features. Alternately, you could verify if it is the TV's fault by trying another unit on the same cable connection.

If an extended period of unplug/rreset nor all configurations and settings would not correct the problem, then it would be an internal electronic problem. This of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.

If you are considering a DIY, pls confirm if your model uses the RCA CTC-203 chassis. Foremost to check would be the tuner section. Some versions have known issues with some components SMD cap on pin#1 of U12101(LA7612N) and its L12303.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.


Posted on Sep 26, 2008

  • 3 more comments 
  • Louie  Role
    Louie Role Sep 26, 2008

    Hi again,

    I appreciate the rating that you gave me. However, it might be to your advantage to unrate me for the moment. This would give you the opportunity to view the other solutions posted by other resident experts. Perhaps a collaboration, exchange of ideas would address your concern more effectively.


  • Louie  Role
    Louie Role Sep 26, 2008

    The description "...partly "deprogram" itself..." could refer to a corrupted EEPROM's firmware.

    As I posted earlier, pls unrate my solution so as to enable you to view the other solutions/proposal. To name them:


    • Abrsvcs ...replacement tuner (247225)...;

    • welcomejee Acoustic Frequency Tuning (AFT) or perhaps he was referring to Automatic Fine Tuning;

    • swami nathan who reiterated the idea of SAP;

    • and ginko might be on to something, a temporary workaround is to install a separate tuner/receiver and feed its audio/video out to the RCA TV. This is of course assuming that the tuner or parts of it in the TV is the issue.
    Cheers.



  • Louie  Role
    Louie Role Sep 26, 2008

    I have sent an email to the CM and Premium Support to assist in removing the FixYa rating. Pls bear with us while we sort things out. Again the idea is so that you would be able to appreciate/view the solutions of others.

    Appreciate your patience.


  • Louie  Role
    Louie Role Sep 27, 2008

    Due to site policies, the rating is locked. For the moment, I would suggest:


    • try the temporary workaround, that is use an external tuner/receiver. Even an old VCR would serve the purpose. The ANT/Cable should be plugged to the VCR's ANT/Cable/RF IN and its audio/video out fed to the RCA TV;

    • check the tuner as Abrsvcs has posted. According to him, P/N is 247225. You could also try clicking on Abrsvcs and thereafter click on his "Ask Me". I am sure he would be more than willing to provide additional information/assistance;

    • if you are using a satellite receiver (as ginko has pointed out), it is also possible that the dish orientation needs a little tweaking.
    All others would require deeper troubleshooting.



  • Louie  Role
    Louie Role Sep 28, 2008

    Any updates?

    Have you tried the workaround (external receiver)?


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  • Master
  • 1,268 Answers

Are you using a satellite dish? Or cable provider? Call your cable provider or satellite provider and check what's going on with those channels. The audio frequency from those channels are having some problems from your receiver. They can advice you on what to do next when you call them.

Posted on Sep 26, 2008

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  • RCA Master
  • 19,396 Answers

Try leaving the tv unplugged for a longer time, let say a couple of hours, and see if it happens again.

Posted on Sep 11, 2008

  • 1 more comment 
  • Ginko
    Ginko Sep 11, 2008

    First try leaving the tv unplugged for a longer time, and see if it happens again. Unplugging for two or three hours will drain completely power from your TV, resetting the eeproms inside and sorting out troubles from electrostatic charges.

    If it does not work it is probably a faulty component that starts giving the trouble when it overheats, probably a fauilty IC on the audio circuits, a transistor , or a blown capacitor.

    If it happens only on some channel it can also be a problem on the tuner circuit board, often integrated with the main board.

    If you are using an external TV tuner, sat or cable box, than the receiver box can be faulty, and not the tv.

    See if unplugging and eventually testing a different receiver box makes any difference. If not the TV must be taken apart and tested by a technician.

    If you need to validate your guaranty, or you want to call repair support, you can ring the phone number listed on the TV owner manual.

    Regards


  • Ginko
    Ginko Sep 26, 2008

    If sound goes off regularly and only on channel 20 to 29, and the simple solutions above did not work, then it is probably a faulty tuner board.

    If this happens on all channels, then the problem is with the audio board.

    Unless you have experience in TV repair, you will need to call a technician to fix this.

    Unfortunately not all repairs can be done by the user.

    You can call a technician by ringing the phone number listed on the owner manual.

    Regards




  • Ginko
    Ginko Sep 26, 2008

    More, if you get the problem using an external receiver, as a digi box or a sat receiver, then replace the receiver box.

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