I have a cheap Tevion TV in the kitchen. The signal strength is not great.
Poor reception area and possible downlead damage.
I find that pressing the coax can bring back the picture - I wonder if the
RF Board has a poor connection. Coax plugs are properly fitted.(Or is it a
Today I notices a slight tingle as I touched the coax and the metal socket
Decised to put a paperclip between coax body and faceplate and the picture
improved. Effectively earthing the screen.
Any suggestions as to what is going on?
Would you expect the faceplate to be earthed? The ones in my old house
weren't. I found this to my cost when I unplugged the aerial cable from the
DVB-T capture device in my PC, while holding the metal aerial plug in one
hand and the earthed metal case of the PC in the other. There was a definite
tingle - strong enough to think "ouch, that hurt - I don't want to do that
again". It turned out that my TV (connected to another arm of the aerial
cable) had about 200 V between the screen of the aerial (and of audio phono
sockets) and mains earth, although with a very high resistance in series. By
simulating my body resistance with resistors (I really didn't want to get
another shock - it was that strong) I established that the voltage that my
body had experienced was about 90 V (potential divider of about a megohm
internal resistor in TV and about 300 kilohm human body resistance).
There will be a clip of some sort to which the braid of the aerial cable
should be attached. Also the OP should check carefully for any stray
strands of braid which may be coming into contact with the central core
when the cable is flexed. The symptoms smell of earth problems.
Capacitive coupling (in the receiver) was only necessary
when TV receivers were all AC/DC with the one side of the
mains connected to the chassis (and many sets had reversible
two pin connectors on the back so it was a 50-50 chance
whether the chasis was live or not.
What if there is a masthead amplifier - are you just going
to let it float and pray that the whole system never gets
connected to the live mains because of a fault?
What if it connects to a distribution system feeding two or
more outputs so that a fault on the equipment connected to
one output could render all the other outlets live?
No not rubbish, it does not -need- to be grounded and never has.
Back in the day that was the case but we never connected the aerial lead
to earth never seen it done. These days with some type of switch mode
power device there may well be some leakage but in effect no different
to what's been around for years and still no problem.
So how do and do all those masthead amps survive, what is the fault
condition that will render them damaged?
Distribution systems as Bill Wright will tell you have each and every
outlet connected to an Earthing bar just in case some pillock does
bypass the isolator in the TV and feed mains up their co-ax distribution
It is worth noting that in general it does no partcular harm to earth an
aerial and that the 'tingle' you may get from a TV chassis - of which
the only accessible bit is the coax socket outer - is usually due to the
RFI suppression and lack of mains earth. In short there will be
capacitors between live and chassis and neutral and chassis on a two
wire system. leaving the TV frame at 110V though with a pretty high
In the case of a laptop computer, not high enough to prevent it
destroying a serial port on another machine to which it was connected.
I would definitely earth any two wire TV system that shows this sort of
It can blow electronics to which it is connected otherwise.
Though normally any piece of kit that is earthed, will ground theTV as well.
The New Left are the people they warned you about.
Reread what you are replying to. The OP said it should not
be grounded full stop. This implies never, which is not
I did not say it should always be grounded. In fact I think
it unlikely that any aerial feeding one set only would ever
If it was a single feed there would normally need to be an
earth connection as I said but there are circumstances where
it is not only desirable but esential
Double isolated PSUs these days are very good but that has
not always been the case.
What Bill says reinforces my comments. A pillock induced
fault is still a fault, whether you like it or not
I'd check the lead and plug/socket. I'm afraid most people don't seem to
have the knack of fitting Belling Lee style connectors to coax and a
poor braid connection is all too common.
It is possible there is a bad joint inside the TV but I'd check the
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