Television has no sound in dc 12 volt mode (Axess model TVD1805-22)

Looks like it is too old

https://www.google.com/search?q=road+eagle+12+volts+dc+to+110+volts+ac+power+inverter+model+number+mp-550+rx+wiring+diagram

..

first is no i would not recommend feeding the 9 volt dc through the actual 9 volt ac it may damage the bridge rectifier that converts the ac to dc

Directly from the user manual, Page 5 under "AC/DC Power Sources":
DC Models ONLY
"This TV model operates on both standard household current (120 volt, 60 Hz AC) and car battery (12 volt negative ground DC) through the cigarette lighter. An AC power cord and a car cigarette lighter adapter cord are supplied.
Household Installation
Insert the AC power cord into the connection on the rear of the TV. Connect the two pronged plug into an AC outlet (120 volt, 60Hz). If you are unable to insert the plug fully into the wall outlet, try reversing it. If the plug does not fit, contact an electrician. Do not force the plug or defeat the safety purpose of the polarized plug."

The manual goes on to describe the vehicle installation which is identical to the household, with the only difference being the car plug goes into the DC side of the power connections at the back.

There are several kinds of power cord available for older TV models. Unfortunately, after an exhaustive search, I was not able to locate a photo of the back of that model television.
However, I have included three of the typical US power connectors found on a great many devices and in the majority of cases, one of these cords will likely be the one you need. They can be found at most local stores such as Wal-Mart, or can be ordered online from Amazon. Also, the cored generally only fit in one direction, especially if the cord happens to be polarized (thin blade and wide blade).

I hope this helps!

Panasonic CT 13R50 Manuals and User Guides

dc will not power ac, soorry

in a word no!,,,,it cannot and you may blow it up if you hook it up to the 115ac volt supply,,,in side it there is a switch mode power transistor,,that bumps up the 12 volts to 115 volts it only works the one way,,that is 12 volts dc in and 115 volts ac out,,,,

DC is direct current and AC is alternating current.

eg; 12 volts DC stays 12 volts constantly, positive or negative.

12 volts AC (at 60 Hertz or cycles per second) alternates from positive to negative then back to positive voltage again 60 times per second.

If you have AC hydro for sure to unit, perhaps a fuse in the 12 volt DC panel has blown, or in thermostat itself. Hear any clicking at AC unit when turned on? If not, check all your fuses in 12 volt DC panel. Check breaker didn't trip also on 120 VAC.

THE ANSWER TO MY QUESTION WAS FOUND OUT BY MYSELF BY VISITING A REPAIR / SERVICE DEPARTMENT AND MAKING ENQUIRIES CONCERNING THE DC OUTPUT OF THE AC ADAPTER ASSOCIATED WITH THE WESTERN DIGITAL, MY BOOK 250GB USB. tHE VOLTAGES ARE THESE. : - AC INPUT = 100 - 240 VOLTS 50/60 HZ
DC OUTPUT = 12 VOLTS ( REGULATED ) 2 - 0 A
CENTER PIN OF 12 VOLT DC INPUT PLUG IS " POSITIVE "

THANK YOU FOR THE SPACE TO ASK MY QUESTION.

Model HER-48-12010
P/N: 68300021-0013
AC Input
DC Output

Are you certain the polarity of the connections to the TV are correct? If you connected them in reverse you may have damaged the TV. If there's a fuse in line check that too. BMW