My rca truflat tv's volume goes up and down by itself.

Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Most RCA and GE TV sets use a four digit code to control the v-chip. The code reset procedure is different depending on the model. Try each method until you find one that works:

1. Hold down MENU on the remote and VOLUME DOWN on the TV it's self at the same time for at least 4 seconds. The set won't say so, but the lock will be unlocked

2. Hold down the 0 on the remote and the VOLUME DOWN buttons on the TV its self at the same time for at least 4 seconds. The set won't say so, but the lock will be unlocked

3. Hold down the MENU button on the front of the TV and the TV button on the remote at the same time for at least 4 seconds.

4. Hold down GO BACK on the remote and MENU on the front of the TV at the same time for at least 4 seconds.

5. Hold down EJECT on the front of the TV and the MENU button on the remote at the same time for at least 4 seconds.
Depending on the model, one of the methods should unlock the V-chip. Now, if desired, you can change the settings on the V-chip by going to the MENU and going to PARENTAL CONTROLS, or on some sets, going to MENU and then going to TV SETUP, then to V-CHIP SET.

Hello
First of all, you must ahve its original remote control to unlock FPA lock. If you have it, go through the folloing steps.
* Hold down Menu button on the remote control, and the Volume Down button on the at the same time for at least 4 seconds. "The set won't say so, but the lock will be released".
** Hold down Zero button on the remote control, and the Volume Down button on the TV. The set won't say so, but the lock will be released.
*** Hold down Menu button on the front of the TV and the TV button on the remote at the same time for at least 4 seconds. The set won't say so, but the lock will be released.

You will need to have the remote:
Press the VOL+ on the remote control and the CH+ button on the front of the TV.

The TV will prompt you to enter a new password.

Hello

Just unlock your RCA tv, by folloing the methods given below. One amoung them will surely unlock your V-Chip. After that you have to reset the V-Chip settings with an other code of your like.

Most RCA and GE TV sets use a four digit code to control the v-chip. The code reset is different depending on the model. Try each number until you find the one that works for you.

1. Hold down the MENU button on the remote and VOLUME DOWN button on the TV it's self at the same time for at least 4 seconds. The set won't say so, but the lock will be unlocked
2. Hold down the 0 (zero) button on the remote and the VOLUME DOWN button on the TV itself at the same time for at least 4 seconds. The set won't say so, but the lock will be unlocked
3. Hold down the MENU button on the front of the TV and the TV button on the remote at the same time for at least 4 seconds. 4- Hold down GO BACK button on the remote and MENU button on the front of the TV at the same time for at least 4 seconds.
4. Hold down EJECT button on the front of the TV set and the MENU button on the remote at the same time for at least 4 seconds. Depending on the model, one of the methods should unlock the V-chip. Now, if desired, you can change the settings on the V-chip by going to the MENU and going to PARENTAL CONTROLS, or on some sets, going to MENU and then going to TV SETUP, then to V-CHIP SET.

OK.

The buttons on the tv are the problem. I clipped the prongs on one of mine and fixed it .Just use the remote now

If you can hear sound and the sound coems from your TV, try changing the volume with teh TV remote control. Your TV isn't off it is still on. Just the video board or portion is cutting out. this could be a ton of things, I would try changing out the power strip or plugging the tv into the wall directly to make sure it has enough power. other then that you can try a home brew solution like putting a fan next to your tv to cool the component that seems to be overheating and shutting down your picture.

maybe defective speaker or audio output ic or shorted capacitor within audio circuit

i would honestly suggest if you still have the receipt return it back. dont forget your rating thanks.
This is a very common problem for RCA TV. I have one as well. or go to www.tv.rca.com/ there are free manual there

This sounds like something best handled by an experienced tech since the fix involves extreemly high voltages nearby,
If you have a very good knowledge of the inner workings of tv's then ask for more information.