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-   -   Legend TV issues (http://www.forestriverforums.com/forums/f113/legend-tv-issues-22324.html)

Barnman1 04-25-2012 06:36 PM

Legend TV issues
 
I have a 2012 Cherokee 264L it came with a Legend 23" TV. It has worked fine while plugged in to shore power. I decided since it is a 12V TV and there is a 12V supply next to it, I would get a cable and connect it to the 12V. The label on TV says 4amp and the 120v to 12V adapter that came with the TV says 4amp. I went and got a cigarette lighter adaptor that was 5amp. Connect everything and the 5amp fuse blew. It was a fast acting fuse so I decided to replace it with a slow blow. Connected again and blew the 15amp slide fuse in the converter panel. What gives? Anyone have an explanation of why this is happening? Or can tell me what I can do to put the TV on 12V.

onetonford 04-25-2012 07:14 PM

Check to see if the adapter has the polarity reversed.

Herk7769 04-25-2012 07:42 PM

OK, here is the thing.

4 amps at 120 volts = 480 Watts

480 watts at 12 volts is 40 amps

onetonford 04-25-2012 08:20 PM

WOW 40 amps? on TV.... My 22" Vizio the adapter is 120V at 1.5 the Output is 12V at 4.58 amps. That was why I assumed he was talking about 12V power.

Herk7769 04-25-2012 08:48 PM

Quote:

Originally Posted by onetonford (Post 187009)
WOW 40 amps? on TV.... My 22" Vizio the adapter is 120V at 1.5 the Output is 12V at 4.58 amps. That was why I assumed he was talking about 12V power.

Hmm. 120 volts at 1.5 amps equals 180 watts of input power. The transformer outputs 12 volts times 4.58 amps for 54.96 watts

That transformer must get pretty hot.

I tried to look to see what the 12VDC specs were for his TV but can not find a manual with the power requirements. 4 amps of 120 VAC is a LOT of power for a 23 inch TV. Still looking

Herk7769 04-25-2012 08:56 PM

No luck. Barnman1 Can you scan the specs page from your manual?
Looking for the watts consumption on the TV.

onetonford 04-25-2012 09:06 PM

Herk Just look at power transformer again Input power 100-240V 50-60hz 1.5amps
also says AC Adapter and is about 3" x 3" square and 1" thick and very lite for its size Can't be much for a Transformer? I don't think it gets very hot when used in house I will need to check back of TV for it's amps....

Years Ago I had 12V RCA Tube type 12 inch Black and White TV in My Other Fiver and when you Used it it would pull the lights down you could tell it pulled alot of amps with this TV you don't even see a flicker when you turn it on.

Herk7769 04-25-2012 09:09 PM

The 4 amps at 120 volts threw me.
That seems real high for a flat screen TV.

RJHuser 04-25-2012 09:15 PM

Hi All:

I looked for the specs on the Legend TV also with no luck.

If the TV says 4 amps, and its 12 VDC input, then 48 Watts.

As far as the transformer stating 1.5 amps at 120 VAC (180 Watts) input, 4.58 amps at 12 VDC (55 Watts) output - welcome to the wonderful world of switching power supplies, not very efficient but small and inexpensive to make.

Thats why they recommend not keeping wall warts plugged in when not in use, they still use several to 10's of watts even when not connected to a device (thus the term "parasite" load).

Herk7769 04-25-2012 09:18 PM

22" (21.6") Skyworth LED 12 Volt TV DVD Combo Digital Tuner SLC-2219A

For their 22 inch TV:
Power Requirements: 42 Watts (3.5 Amps max) w/o DVD

42 watts divided by 3.5 amps is 12 volts.


So if his 4 amp fuse is for the DC supply. That is 48 watts; not 480.


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