out went 12" CRT TV and in came 24" LED but help.

[rmasonschneider]

I just purchased a 24” LED tv to replace the old 12 inch CRT which came with the unit from the factory. It was my understanding that the original CRT drew about 30w which is pretty close to the 33w draw on the new LED so I just picked one up for an overdue upgrade. When I removed the old tv, I discovered that the power cord (part that plugs into the tv) was hard wired to the rv electrical system and not a standard AC plug in. I now have a male plug that used to plug into the back section of the old CRT which was able to run off the batteries.

The new LED 24” tv came with also came with its own AC power cord/supply the small “brick” that looks similar to that of a laptop which has it’s own male plug that looks similar to what used to power the old CRT. Not knowing the compatibility of the old plug with the new LED tv, I have not attempted to plug the original power plug into the new LED TV and just plugged the new tv into the AC receptacle to be safe. So now I can’t watch tv when unless i’m either hooked up or running the generator. I need your advice in changing that.

The original 12” CRT is undoubtedly 12V and likely drew about 30w, can’t find the amp draw.
The new 24” LED shows: 19V 2.0A and 33W on the spec sheet.

Will the original power cord power the new tv without damage?

Thanks in advance,

[wa8yxm]

The amp draw... Depends on the source

If you are running off 120 volts via the brick than 33 watts around 1/3 amp at 120 volts allowing some conversion loss.

At 12 volts it is 10/3 (or 3 1/3 amp) since you need to do a DC/DC conversion to 19 volt, and at 19 volt it is about 1 1/2

In a DC circuit watts = Volts*amps, so AMPS = Watts/Volts

In an AC circuit Watts = Volts * Amps * Power factor (Takes a Kill-a-watt to find that).

And conversion loss Ac to DC, ro DC to DC is 10-20 percent.

Does this help?d

For reference, this is like hour one of the AC-Theory class I had to take to get certified once.

[Dtank]

2oldman wrote:

sch911 wrote:
Again! What does the power supply brick for the new LCD show for output voltage??

Twice isn't enough?

"sch911" - it's a Dead Thread (now).

Re-read (as in "Again!) - for what you missed..;)

.

[2oldman]

sch911 wrote:
Again! What does the power supply brick for the new LCD show for output voltage??

Twice isn't enough?

[rmasonschneider]

obgraham wrote:
OP: what people are saying is that if you use a small inverter, you could likely power your TV, your BluRay, and your Cable Box all from that. Just make sure you get an inverter with the capacity that all three will require.

thank you for that clarification.

[obgraham]

OP: what people are saying is that if you use a small inverter, you could likely power your TV, your BluRay, and your Cable Box all from that. Just make sure you get an inverter with the capacity that all three will require.

[sch911]

Again! What does the power supply brick for the new LCD show for output voltage?? Only then you will know.

[rmasonschneider]

If the tv can be taken care of with the adjustable power supply, I would need individual power supplies for the new blue ray player and digital cable box.
It looks like i'll be limited to watching tv only with a hookup or genset on.

Thanks for all the help.

[Learjet]

instead of an inverter you can get a 12 volt to 19 volt power supply..

look around something like this....

[2oldman]

rmasonschneider wrote:
Will it work?

Still no.

[rmasonschneider]

Thanks for the quick replies. I found the specs for the old crt too.
old crt 12": 12-14V 4A
new led 24": 19V 2A

Will it work?

[2oldman]

magicbus wrote:
I would throw a meter on the wires and confirm it really is 12 volts before plugging anything anywhere.

^^ Do this, then...

If it measures 12v, (likely) then put a small psw inverter on there and plug the TV brick into the inverter.

12v into a set requiring 19v is not a good idea.

[magicbus]

... the old CRT which was able to run off the batteries... The original 12” CRT is undoubtedly 12V

You do know for a fact that the old tv is 12 volts right? That the old TV power is not on an inverter-driven circuit? I would throw a meter on the wires and confirm it really is 12 volts before plugging anything anywhere.

Dave

[Chris_Bryant]

rmasonschneider wrote:

The new 24” LED shows: 19V 2.0A and 33W on the spec sheet.

There is your answer- unless your rig is wired for 19 volts (a typical laptop voltage), the answer is no.

[tenbear]

sch911 wrote:
Look at the specs printed on the power brick for the new LCD and see what it's output is. This should answer your question.

X2. If the brick shows the output voltage is 12 - 14v, connect the TV, without the brick, directly to the 12v power in the RV.