Putting a resistor inline with your circuit would drop your output voltage
Are you sure you have the polarity of the power correct? Do you have a bench top power supply at home, work, school etc that you can try it with?
Is the supply supposed to be AC or DC?
If you've lost the original supply & have to use this one & need to pull the voltage down rather than try to fit a series resistor in you'd do better to add an additional load, say a 1 amp 12Volt light.
Actually if I was you I'd buy a cheap multimeter & take a reading of what the voltage under your TV's load is. I'd expect a 12V 1.5A supply to be putting out abot 13V at half an amp so it is likely that the problem is elsewhere - it could well be poor filtration of the voltage from the wall wart or overdriving of the voltage or a failing mini TV
I suspect the problem is that you need a DC supply. Transformers only supply AC, you you need to dump the transformer and get a real DC supply, capable of 12 volts and at least 500 mA. One rated at a higher current is OK.
PS, I never saw a TV that would operate on this little power.
If the TV is designed for 12V and the power supply is 12V; the power
supply's capacity (1.5A) is irrelevant.
Check the voltage of the power supply. A 12V rating can deliver 15V
open circuit (or more).
Your tv will work best with it's original power supply.
The transformer's 1.5 Ampere rating is the amount of current it can deliver without overheating. If the miniature TV only requires 500 mA, that's all the transformer will deliver.
Look elsewhere for your problem.
I have found a 12v, 1.5A transformer to use with a miniature television that I will be modifying. Problem is, it is designed for a 500mA current, and doesn't operate properly when the transformer is supplying too much current.
Will adding a resistor in between the transformer and the TV lower the amperage properly, and if so, what kind of resistor? I am confused on how to add current drop to an already-rated transformer.
