Question about Toshiba 32AF44 32" TV

2 Answers

Volume Problem Occasionally the TV will turn the volume down to zero or all the way up to 100 of its own accord. It also seems to have problems turning on as well. Does anyone know what the problem could be? Thanks!

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  • 11 more comments 
  • Rick Dude Jun 06, 2007

    Is it a matter of cleaning the corrosion from the circuit board/switches or completely replacing the switches? This problem has been going on for a long time, so I would think that if it was caused by a cleaner, the substance would have evaporated. Bear in mind that I have a great deal of experience working with electronics/soldering as I'm an experimental physicist, but not specifically in the area of TVs. Thanks.

  • Rick Dude Jun 06, 2007

    Sorry about the rating, I didn't actually click on anything for the rating, but I would like to give you a high one

  • Rick Dude Jun 07, 2007

    Ok, I actually inspected the switches and their connections and there was no sign of corrosion in either case. Furthermore, I removed both volume switches to see if the problem persisted now that they were removed. Unfortunately, it did. The volume started going back up to 100 a few minutes after turning the TV on without the volume switches. What should I do now??

  • Rick Dude Jun 07, 2007

    Yeah, all this was done without batteries in the remote. I went ahead and removed the infrared sensor, but the problem still exists. What else could it be?

  • Rick Dude Jun 08, 2007

    Ok, how can I locate the switch matrix or the IC, and would it just be a matter of replacing the needed component?

  • Rick Dude Jun 10, 2007

    Ok, I have a copy of the schematics and have somewhat of an idea of where I should be focusing my attention. Would it be possible for me to send a copy of the schematics to you via email or another electronic method to verify exactly where I should be looking? Thanks!

  • Rick Dude Jul 09, 2007

    So I think the problem is located around the Chips QV01 or QA01. Should I be checking the chips themselves or just the capacitors around the chips?

  • Rick Dude Jul 10, 2007

    Yes, I did. Let me know if you haven't received it and I will send it again.

  • Rick Dude Aug 31, 2007

    Actually no progress has been made on this. I sent him the manual but never received word back on it. I tried replacing the main IC chip on the board, but I may have overheated it during the soldering process, so I am back to square one. Any assistance you could provide would be awesome!

  • Rick Dude Sep 19, 2007

    Sorry about the delay, but I just sent the manual to both you and techman again. Thanks!

  • Rick Dude Sep 20, 2007

    I tried removing the remote sensor, but the problem persisted even while it was completely removed from the circuit. So, unfortunately, I don't think that it is the problem.

  • Rick Dude Sep 21, 2007

    I apologize about that, I sent the wrong file, but I just sent another email containing the file with the circuit diagram.

  • Rick Dude Sep 21, 2007

    Also, the jmg.junk@gmail.com email address does not seem to work

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  • 279 Answers

Did Techman help you solve this via email then, or did you solve it for yourself? If you still need help with this, let me know what progress you've made (if any) since the last posts here.

Posted on Aug 31, 2007

  • John Goodman Aug 31, 2007

    Could you send that same manual to me? I better have you send it to my junkmail account, because posting another address on here would be asking for spam. I'll look out for it though.

    jmg.junk@gmail.com

    I'll take a look at it and see what I can figure out. I'm not sure if I'm as experienced with televisions as techman seems to be, but sometimes a fresh perspective is worth more on something like this.

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  • 3,130 Answers

There are small tact switches behind the buttons on the front of the TV set. These switches go intermittent sometimes on Toshiba TV's and will cause all sorts of problems. This could be due to someone spraying the front ogf the screen with cleaner and the cleaner dripping down the front by the picture tube and dripping onto the printed circuit board. This can be checked by carefully sliding out the chassis of the TV set and looking for a green corrosion around the small switches. If you have no experience with printed circuit boards or TV repair, play it safe and take the TV set into a repair shop, as this should not be a big deal or cost you a great deal of cash. Good Luck

Posted on Jun 06, 2007

  • 9 more comments 
  • Larry  Dillon
    Larry Dillon Jun 06, 2007

    sure man the switch corrode over time and thanks for the rating.

  • Larry  Dillon
    Larry Dillon Jun 06, 2007

    check the switches, if this is your problem you will see it, if it is not check into the remote IR sensor assy. Good Luck

  • Larry  Dillon
    Larry Dillon Jun 06, 2007

    Oh well to late now my friend unless you send a message to fixya saying it was a mistake?
    __Thanks anyway, and dont hesitate to ask any other questions.

  • Larry  Dillon
    Larry Dillon Jun 07, 2007

    Unsolder the infared remote sensor from the board and see if the volume stays. Oh and you have also taken the batteries out of the remote I assume?

  • Larry  Dillon
    Larry Dillon Jun 08, 2007

    It has to be a capacitor in the switch matrix circuit that is leaky, that would be one of those small surface mounted types of capacitors, or the microprocessor IC

  • Larry  Dillon
    Larry Dillon Jun 08, 2007

    The switch matrix is what the circuit is called, it is where you have the scan and drive lines from the microprocessor IC. There are small capacitors off each one of these scan and drive lines. You arte going to need to get the service manual for this set so you can locate the capacitors and the microprocessor IC.

  • Larry  Dillon
    Larry Dillon Jun 26, 2007

    Sure send the service manual to techman32k@yahoo.com

  • Larry  Dillon
    Larry Dillon Jul 09, 2007

    Did you send this service manual to me yet?

  • Larry  Dillon
    Larry Dillon Aug 31, 2007

    Never received it my friend.

  • Larry  Dillon
    Larry Dillon Sep 19, 2007

    Have you disconnected the remote sensor yet? I have had this problem before now that I look at the schematic. If the set works good with the front buttons after you disconnect the sensor completely, replace the sensor.

  • Larry  Dillon
    Larry Dillon Sep 20, 2007

    Where is the schematic for this service manual? It only has the block diagram.

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Does your TV have a "half-mute" setting:
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When i turn the tv. on, the volume line appears all the way to zero. if i turn the volume up, it goes up but when i release the up button the volume goes down all by itself.


It sounds like one of the volume down buttons is stuck in the activate position. The same as if you were holding the down volume button continuously. It could be either the volume down button on the TV or the remote. I would try remove the batteries of the remote then adjust the volume by the TV buttons.


If the volume doesn't go back down then the remote is the problem. In order to fix the remote you may need to take it apart. This is normally easy to do just locate any screws that may be holding the remote together. If you don't see any screws then you will need to pry the two sections apart. Separate the circuit board and rubber buttons and clean them both with some rubbing alcohol and reassemble it. If it still has the volume issue you may need to replace it.

If the problem persists with the remote deactivated then it's the volume button located on the TV. That is a little more difficult. You can try wiggling the button or some canned air (used to clean computer keyboards) to blow it clean. However it may need to be disassembled to gain access to the switches for proper cleaning.
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