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It sounds like your Dometic unit is not getting power despite the breaker being on. Unless the Dometic unit has an internal fuse to check, I would get out a volt/ohm meter and check to see:
1. Is there power coming out of the breaker that goes to the ac unit?
2. Is there power at the terminals of the ac unit? (You can sometimes remove a ceiling cover to access the contacts on the on off switch.
Lastly is your RV hooked up to full power with two 110 volts on both legs beside the neutral and ground wire? If you are only feeding your RV with a standard 110 volt extension cord and using an adapter, that can mean half the circuits in your RV are energized while the other half 110 volt leg is not. You must energize the second leg by using a full 30 amp or 50 amp dual power cord.
RV's are funny. They require two 110 volt legs with a neutral and a ground. The two 110 volt legs are both of the same phase. There is no 220 volts between the two hot legs as they are in phase. A volt meter between the when hot would read zero volts, while each hot leg to neutral would read 110 volts.
Cords can be purchased at Lowes or Home Depot. There are no adapters to use in AC outlets. You have to determine if it's 110 volts or 220 volts first. You cannot convert one to the other. Replacement plugs are inexpensive at the same hardware stores to change it to your needs. Follow proper safety precautions or have an electrician do it.
Check the power adapter, it may have an variable input voltage 110 to 220 AC volts, then you only need to get a travel mains voltage converter to suit the US mains outlet. Otherwise you need to buy a new Toshiba power adapter that operates on 110 AC volts.
An AC adapter should output DC. The device should say next to the power plug what voltage input it requires. Also, check the AC adapter, it may say something like "Input 110-120VAC Output 9VDC".
You need a charger with this features:
90W Laptop AC Adapter / Charger for HP Pavilion DV5-1125NR / DV5-1127CL Replacement
Diameter : 5.0 mm x 7.4 mm
Input Volt Type : AC
Input Volt: 110-220V (Worldwide Use)
Output Ampere : 4.74A
Output Power : 90 Watt
Output Volt : 19V
You can buy one at: http://www.buy.com/prod/90w-laptop-ac-adapter-charger-for-hp-pavilion-dv5-1125nr-dv5-1127cl/q/loc/101/215845345.html for $19.89 including shipping. If this was helpful, please rate me. Thank you
What voltage is your mains supply?
The laptop's adapter should be a multi-voltage type 110 to 240 volts input.
If your mains is 110 volts AC then the 220 volt AC LCD projector won't work unless you connect it to a step up transformer (110 to 220 volt transformer).
If your mains supply is 220 or 240 volts then both the laptop and the LCD projector will work without any problems.
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