T.V ?

Discussion in 'Motorhome Chat' started by crabman, Jul 9, 2016.

  1. crabman

    crabman Funster

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    i have a 12 v T.V it not will run on the leisure battery, when I plug in to the mains it works perfect, if I unplug it from the mains the leisure battery will not run the T.V can any tell me why ?

    thanks In advance


    crabs
     
  2. golly

    golly Funster

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    Have you tried it in any other 12v outlet, see if it works from the cab outlet
     
  3. Speve

    Speve Funster

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    If you are on hook up it should work on your batteries sounds like a fuse blown somewhere?
     
  4. Clickem

    Clickem Funster

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    The probe on the 12v power cable that pushes into the female connector contains a fuse that has blown on ours a couple of times
     
  5. ambulancekidd

    ambulancekidd Funster

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    Are you sure that your leisure battery is ok? Me thinks its time it was tested. The battery may well operate your lights etc but the TV draws a much larger current. Oh do not trust the vans own battery gauge, they're notoriously optimistic & therefor unreliable.
     
  6. teensvan99

    teensvan99 Funster

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    As stated check the leisure battery voltage. If less than about 12.2 volts the TV will not switch on.
     
  7. crabman

    crabman Funster

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    read all your replies, I have tried it from the cab golly no luck, the fuse is ok clickem, it may be a good idea I get the battery checked as ambulanceman says, it is about the only thing left I have not checked, might be a fuse ii have overlooked speve I will check the lot again as well, just picked up your post teenvan99 it sounds it may well be the problem, the power coming put the battery I will get it checked out

    anyway thanks again if ii can find the problem I will post about it
     
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  8. buckby

    buckby

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    Did the 12 volt cable come with the television if not it could be wired up the wrong way round just a thought
     
  9. pyro

    pyro Funster

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    Presumably you have a 12v power "brick" and a separate mains power "brick" to operate the TV??

    Do you have a 12v socket in the can running off the engine battery? If so, worth trying that with the TV before anything else.

    If that works, it's probably a missed fuse or a knackered leisure battery.

    Probably best to plug in the 12v power brick into the socket you usually use and check if you have an output voltage before chucking out your leisure battery (or having it tested by someone trying to flog you another). Then work backwards, if no power, check the plug fuse, then try something else in the socket that it plugs into (cigarette lighter?) and if that doesn't work, finally, check the 12v fuse for the whole 12v circuit.
     
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  10. crabman

    crabman Funster

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    ok pyro sounds a good plan

    thanks
     
  11. crabman

    crabman Funster

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    have a car eclectics guy coming to check the system and the battery this week, he has fixed sparks on MH before and has the test equipment for the battery, so we will see, thanks again for your time to reply everybody
     
  12. pappajohn

    pappajohn Funster Life Member

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    Crabman states it works on mains voltage.
    If the 12v lead was wired in reverse it would blow the tv completely....no 12v, no 230v.
     
  13. buckby

    buckby

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    It may not as modern electronics can sometimes sense a reverse polarity and just not work to save blowing the television up
     
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  14. pyro

    pyro Funster

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    Either a diode to protect against reverse polarity or a blown fuse. These things usually use unfused switched mode power supplies to provide a 12v DC input. If the 230V power supply works, then the set is OK, so it is most likely a 12v supply problem as described r a broken 12v supply brick

    Fault finding in this matter is known as the half-split (or divide and conquer) methodology

    "The technician will use their experience to make an educated guess as to where the fault may lie, and then progress forward or backward in the particular circuit whether it be"

    http://troubleshooting.hnd-computing.com/?page_id=44
     
    Last edited: Jul 11, 2016
  15. DanielFord

    DanielFord Funster

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    I'm going to take a wild guess here. You know when you get the 12v socket attachment out of the packet, and there is the spare positive head, and we all think "why would I need that?" well it has a different pin size. So I'm guessing you need to swap the heads so that the pin hits the positive connection.
     
  16. pappajohn

    pappajohn Funster Life Member

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    ?
     
  17. DanielFord

    DanielFord Funster

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    I'll have to take a photo, it is tricky to explain in words :D
    Essentially the middle bit of the 12v plug sometimes doesn't hit the plate in the socket.
     
  18. The Old Man

    The Old Man Funster

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    Next time you're parked up near someone else in a MH, introduce yourself, explain your TV problem and ask if you can try it in their van.

    Results will determine if it is the TV and/or TV power cable, or with your MH electrics.
     
  19. jenny and mitch

    jenny and mitch Funster

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    Yeah !!! They will be very keen to have you blow THEIR electrickery.
    Mitch. :LOL::LOL::LOL:.
     
  20. JJ

    JJ Funster

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    A multimeter is an essential part of my motorhoming toolkit.

    You can check your battery voltage.

    You can check your 12 volt tv power lead.

    You can check all your fuses.

    I got mine from Maplins for about seven shillings and sixpence...

    JJ :cool:
     

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