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Central Pin: In many laptop power supply connectors, especially those using the barrel-type connector, there's a central pin that carries the voltage (typically around 19 volts for most laptops) to power the device.
Voltage and Polarity: It's crucial to ensure that the voltage supplied by the power adapter matches the requirements of your laptop. Most laptops operate on 19 volts, but there are exceptions, so always double-check the specifications of your laptop and the power supply.
Polarity: Additionally, the polarity of the connector is important. The central pin typically carries positive voltage, while the outer sleeve of the connector is the ground (negative). Reversing polarity can damage your laptop, so make sure the connector is inserted correctly.
Safety: Always use the power adapter that came with your laptop or a compatible replacement from a reputable manufacturer. Using an incorrect or incompatible power adapter can not only damage your laptop but also pose safety hazards such as overheating or electrical fires.
Replacement: If you need to replace your laptop's power adapter, ensure that the new adapter provides the correct voltage, polarity, and wattage for your laptop model. It's often safer to purchase adapters from the laptop manufacturer or certified third-party suppliers to guarantee compatibility and safety.
What you are saying is when you connect that motor home to a shoreline power connector, the outlets are reverse polarity. You can confirm that with something like this: http://www.acmehowto.com/electrical/outlettest.php
You can get this tester at any hardware or lumber place. What caused this? Somehow the polarity got reversed and it is most likely at the connection on the outside socket. It can also be the shoreline drop cord or the breaker box. In an electrical outlet, the small slot is HOT and it should be connected to a BLACK wire. In an appliance like a television the neutral wire (white) is connected to the ground or the chassis of the device, when the polarity is wrong the chassis becomes hot and you get the problem you describe.
Hi David
You need to figure out how the interference is getting inside.
Look at the external connections.
HDMI Cable or Perhaps the Power Connector.
Noise from the power cable would be most likely.
A Ferrite Bead can often be clipped onto power lead to dampen electrical noise. Electronics supply stores have these.
If an AC to DC external box is used. What is the required DC input to your DVD ?
For example if the AC is dropped to 12v DC and then plugged into player via a small connector. You could get your own connector and supply from a 12v vehicle battery. Be careful to maintain correct polarity to tip of connector.
Use a cheap multimeter to check voltage & polarity.
Substitution....This would prove that the noise source is from the Power Supply.
Cheers
Many USB power supplies will have the right plug. I picked one up by buying a cheap USB hub, What you want to look for (most likely on the bottom of the power supply) is VOLTAGE Output: 5.0 VDC, POWER Output: 1.0 amp or (1000ma) and the center hole is the positive side. I have even seen some BluTooth earpiece charges that supply what you need.
Here is a general case solution that might work even if you don't have the manufacturer's expensive adapter if you have some tech skills. Check the input plug on the radio. If you are lucky it should have a symbol next to it with a dot within a circle. The dot gives the polarity of the center connector and the circle gives the polarity of the outer connector of the plug. If you are super lucky, you will have the correct adapter already in your parts bin. Otherwise, you can buy universal 12V power adapters online from all electronics and radio shack. They include just about every kind of plug option and also some feature to select polarity.You can try the various plugs and find the one that fits perfect & then set the correct polarity. The current is not so important as long as you meet or exceed the required capacity which is often not given. Both universal adapters can provide 1000 mA which should be more than adequate. There is always a chance to screw up any electronic part; I can attest to that, but I keep 2 or 3 universal 12V power bricks on hand and have used them for many tech items.
it doesn't matter if its + or - , make sure the pc runs on 19 volts and that the AC adapter does also, look underneath the laptop to find out if it does run on 19 volts but make sure the power jack fits the socket o the laptop before plugging it in to the mains
the very best way to solve your problem, go to the electronic store and ask a dc power supply adapter 15volt 2A,vice versa polarity. with universal connector for it sure you can select the right type connector do you have for it fit to the back socket of your unit. before you connect read the correct polarity of your device you see label at back (+, -). and set the polarity output of the adapter correspond to your unit,,,
I know what you're trying to do, and I don't recommend it. I've done some splicing, and had a few that burned up the machine, so I recommend buying a new power supply. Check Ebay, you can generally find one at a reasonable price. Here check this link to Ebay, they have your adapter for $16 and change. You can't beat that. So why take the chance of ruining the machine.
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