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The volume down is likely bad on the set, this happens a lot and I will explain why and what needs to be done.
All sets with exterior controls, volume, on/off you name it behind each plastic button is a tiny switch---a push switch that when released stops.
Bad ones develop not from age but poor quality,,,,that is a momentary switch, as long as held it should function and when released stop.
Be thankful it is not the sound UP as I have seen that, Menu, you name it.
Now to the proof and the solution, Someone has to gain access to that switch under that plastic button and remove it from the small circuit board it is soldered into---2 to four solder connections and remove the switch.
A ten year old with a soldering iron can do it.
With it removed power set back and see, if problem gone you have a few choices (really no choice if it was me) order and replace the entire board with all the buttons affected or DO NOT PUT THE BAD SWITCH BACK AND just use the set with the remote.
For the technical minded first the reason a remote will not stop this is buttons on the set have priority over the remote functions and YES you can test the bad switch and find it that way---I have seen ones not being pressed that read as low as 3 thousand ohms or less and that is bad=====there should be no reading across the two pins that are for that switch itself.
Let me know if you have questions, PS none of them sell the individual parts you have to buy the same poor quality board with another set of switches on it.
A common issue here is the actual switch the volume down activates--they are called micro switches (as tiny) and what can happen is the actual switch which is only supposed to activate and when pushed but activates on its own.
They are called momentary since they only work when button is pushed.
Volume buttons/switches on cable boxes can do the same thing but it is rarer.
What needs to be done to confirm or disprove that this is our problem is the small circuit board with all the exterior controls needs to be removed and the (in your case) vol down button's switch needs to be un-soldered and removed----if problem is gone you have two choices:
Locate and replace that tiny board with the switches (they rarely sell individual switches) OR with the bad one removed just put the board back and operate the set with a remote---you will only be missing the volume down feature on the set itself.
Easy to remove as only two solder connections for the switch itself--may be two more for a metal piece it is mounted in.
If that does not cure this----some kind of odd problem around it.
Also when this happens the remote may not work as the manual controls have priority over the remote.
If you have the standard pull out push in switch, reach underneath the dash and push in on the small button on the switch (look at the new one and you will see it...looks like a small rivet head with a spring under it) While holding the button in, pull the knob and shaft out, then just remove the nut around the switch extension and remove/unplug the switch. Once the new one is in, just push the knob back into the switch and it will lock in.
If this is the pull out switch, your problem is getting the knob off, I'm guessing. Get out the new switch and note the small push button on the side...it is generally metal and about 1/8 inch in diameter or so. That push button will release the knob shaft. After that, unscrew the bezel, unplug the switch and remove. The shaft will lock when pushed into the new switch.
You need to push and hold the title button till it flashes the hour. Then turn the volume knob to set the hour. Next push the mode button and the minutes will flash. Again turn the volume knob to set.
The title button is to the far right and the mode button is below the volume knob. That should do it!
Press and hold the volume knob until the display shows clock adjust.
use the forward and rewind serch buttons (the small arrow buttons next to the volume nob) to switch hour and minute.
use the volume knob to adjust the time. When done press the volume knob to return to normal operation.
The volume control shaft lube, over time and heat exposure, will flow down and corrupt the contact between the volume twister and the spring loaded sensor. Pull the cover off the tuner, locate the volume control and take out the two screws holding it in. It looks like a small circuit board with the volume twister attached. The base of the twister is hooked to the circuit panel by four metal tabs. Pry these guys gently away and pull the twister free. There will be a metal disk at the end of the volume control shaft, and will have a goopy lube residue on the face of it that can be cleaned with electric contact cleaner or some other kind of solvent. Wipe it clean,(do not immerse) reattach, and test. Worked perfect for me. Good Luck, F
The problem is most likely in the unit. You could have a burned out lite or just a bad connection to the lite. You can take off the volume knob by just pulling on it and checking it out thier, then take the top cover off and follow the wire from the knob and check out the connections.