Sansui 21in LCD VOLUME is lowering

Instructions:

1 Turn on the TV and change it to a blocked station or show. The TV will prompt you for the parental control password.
2 Set the volume on the TV to "0." No sound should be coming from the TV speakers.
3 Press the "Vol -" button on the TV. It will not work if you press the volume button on the remote; you must use the volume button on the TV for this step.
4 Point the remote at the TV and hold down the "0" key on the remote. Keep holding both buttons for approximately 10 seconds. The V-Chip will reset, and the password prompt will disappear.

https://techlore.com/forum/thread/11883/sansui-password-reset

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Replace the speakers.

Perhaps the volume limiter is active? This is to prevent hearing damage. Apple Sound and Hearing FAQ

replace the main board

Go to Tools...Settings....Volume....check your Master / Nav/Media volume control there

well if the volume wont go any louder on the tv even without the remote that can be a problem what i would recommend to do is get a stereo that you could hook up to the cable or satellite or if you use digital antenna use the output of a vcr to plug into a stereo system then you can use a stereo to increase the volume.

check internet

If you are using a Motorola cablebox, you may need to change the Audio in the cablebox to Heavy Compression. You can find this in the cablebox Menu, Setting, Audio. Set the audio to Advanced then change the compression.

The volume control on the TV does not affect the recording. However, if you were recording from a set top box, and you turned the volume down on the box and not the TV, then this would cause the problem you describe.

If this is the case, then try to keep the STB volume at maximum and only use the TV volume control.

Also, some DVD players and VCRs have a lower output than the standard TV tuner, so an increase in volume is usually needed.

You might want to try some test recordings to see what happens.

Found this on another site and it worked, had to switch back and forth a few times but it worked........

I have a Sharp LC-46D43U LCD TV. I think this is a entry level for large lcd tv's. With the volume all the way up at 60, my wife and I could barley hear the tv. I was playing around in the menu and some how have the volume at almost twice the volume. What I did was:
Go into the menu
Go to option
Go to output select
and change from fixed to variable and back to fixed. You may have to do this a few times.
Sometimes the volume goes loud after 1 try and sometimes it may take 10 or 20 tries.
But if I change any settings, even the channel sometimes the sound goes back down to where it was.
Has anyone done this, did it work for you. I don't know very much about electronics and I have now ideal why this happens.
I wonder if this is just something with my tv.