I have cable tv hooked up in several places in the house. For some
reason some channels on 1 of the TVs are fuzzy and make humming noises.
For the fun of it I hooked up another TV to the line the problem TV is
hooked up to. The other TV doesn't have this problem.
Does this suggest a problem with the tuner in the one TV? Something
else? The problem TV is about 7 years old.
Check the settings on the problem TV. On some TV's you have to tell it
what kind of input you are using, make sure its set on Cable.
Other than that, try the problem TV at another spot in the house to
determine if it is the TV or perhaps something in the cable line.
Could be a *cheap* cable. Try switching the cable (from TV to wall) from
good TV to bad TV and see if that fixes problem.
The best cable is called RG-6.
The difference is the "shielding" inside the cable. This keeps outside
electrical "noise" out of the cable.
Different TVs have different sensitivity. That TV might want an amplifier on the
cable to work right. How you wire splitters can
affect signal strength. If you go through multiple splitters, the signal
strength may be weakened more on some links than others.
If, for instince, you have on TV hooked up to a two way splitter, and the second
output from that splitter going to another 2 way
splitter, going to 2 more TVs, the second two TVs each get 1/4 the signal of
the first TV. Using a single multiple splitter sized
appropriately for your needs will even up the signal strength. Or, tou could
rewire your multiple splitters to give the problem TV
the stronger signal. Cheap splitters can also be a problem. My cable company
told me to never use radio shack splitters, and they
were happy to give me good ones, as bad splitters can affect your neighbors
Thanks for the replies so far. I tried some RG-6 but it make no difference.
The problem TV is to large to move to try at another outlet.
I did find something very interesting though:
If I tune the TV to one of the fuzzy channels, then turn the TV off/ back on
the channel comes in perfectly clear. If I change the channel and then
change back the channel is fuzzy again. Turning the TV off and then back on
(when on the fuzzy channel) always fixes the problem (until I change
Also - I had an old calble box lying around. I tuned the TV to channel 3
and then used the cable box as the tuner. The fuzzy channel are perfectly
clear using the cable box.
I'm thinking the tuner in the TV may be flakey. Thoughts?
My tuner is shot. I can use the alternate Input though. (Try hooking your cable
up to a VCR and connecting the VCR into the TV set using either the channel 3/4
settings (predictable problem because of a bad tuner on the TV) or use the
alternate input on the TV (channels come in clear because the tuner is OK on the
VCR.) If the signal is bad from the VCR to the alternate input on the TV set,
you probably should get a signal check from the cable company. If the signal is
good from the VCR to the alternate input yet bad straight to the coax input, you
should consult with a TV repair shop.
The tuner isn't locking onto the stations properly. If the tuner has no user
modifible settings, like an AFC on/off switch or fine tuning dial (a set your
age likely doesn't) then there isn't anything you can do short of having a
shop try to fix it.
It's possible the set will do better with a better signal and you should
follow the steps for minimizing the number of splitters and look at their
The flamewars are over...if you want it.
Unofficial rec.audio.opinion Usenet Group Brief User Guide:
That's a nuisance, but I have a smiliar if smaller problem. When I
turn the tv to channel 3 and go to the other room to turn on the VCR,
I don't get the vcr signal at all. When I then change stations and
then go back to channel 3, the vcr signal is perfect.
Yes it is. Is it still under warranty. If not, I'd want to know that
other copies of this same brand and model worked better before I even
considered trying to have this repaired.
Still, an external RF amplifer might be the first thing to try.
I have 8 tv's in my house, including in the unfinished attic, one
bathroom, and the laundry room. All connected to the vcr, and when I
had cable, to the cable. But I also have 2 RF amplifiers, one with 4
outputs and one with 2. No tv is on a branch with more than one other
tv. That is, there are no more than 2 tv's on the same output of an
I didn't do this on principle. I would hook them up and when quality
through the coax went down, I bought another amp. At radio shack.
It always fixed the problem. They've been working steadily for as
much as 20 years. One is probably covered by old clothing. I don't
recommend that, but it doesn't overheat. These are tiny signals so
after amplifying them they are still very small.
I also have an amplified antenna, for off the air reception. (since DC
stations aren't carried on Baltimore cable.**) For some tv's, it's
signal is too strong, and for some stations on those tv's I have a A-B
switch and I disconnect the antenna and use only the coaxial cable
that goes to that switch. It may be coaxial (shielded) but it still
picks up enough signal on strong stations. (Or like I said, maybe it
is picking up the signal via the unshielded wires inside the tv,
between the connector and the tuner.)
**Useful tongiht when there is some stupid movie on ABC Baltimore, but
a series of good sitcoms on ABC DC. I wonder why they do that.
Remove NOPSAM to email me. Please let
me know if you have posted also.
I suspect that you're right about the tuner being flaky, especially
after you cleared it up with an old cable box. The cable box is working
as a substitute tuner and as long as your tv gets ch 3 (or 4 whichever
it operates on) clear, use the box instead and it's a cheap way to
sidestep the problem. Another way to do it if you don't have an old
cable box lying around is to buy a cheap vcr and use it in the same
way. After hooking up the vcr, select vcr on the tv / vcr option ......
you should be able to change the channels that you're viewing with the
This is a very common problem and very easy to fix. All you need to do is
add a "cable amplifier" (froogle on that) to your setup. The problem is
that every time you split the signal the signal strength is divided equally
(regardless of the quality or brand of the splitter). At some point you
add too many TVs and Cable boxes and VCRs the signal strength is degraded
too much and it usually shows up on certain channels as snow with little
pattern as to which number is effected and each TV will react differently.
A single (one in and one out) 20db amplifier at each TV will work but a
better solution is to get a multiple port amplifier (like 1 input and 8
outputs) and send each TV its own amplified output. In this configuration,
I guarantee you will not have noise on any channel unless a cable is damaged
or a F fitting is very loose. The amplifier is powered by a wall wart power
more db means more amplification. you only really need high gain (like
40db) if you plan to split after the amplifier. If you go directly to each
TVfrom the amp, a lower gain like 4db per output will be enough.
If you have Cable internet, you need a bi-directional amplifier or split the
signal before the amplifier and send an unamplified cable to the modem.
Where did you get that from?
A single amplifier will not clip the signal. As long as you don't put two
or more in series, the signal will not be clipped (sometimes you can but
lets not cover all the permutations). High amplitude at the tuner input is
almost never a problem, the amplifiers have a maximum amplitude anyway which
cannot be exceeded. Clipping of the signal due to amplifying an already
amplified signal could occur, that is why the single distribution amp is the
All this other stuff about tuner sensitivity and miaalignment might have
made sense 20 years ago with mechanical tuners but with a varactor
(electronic) tuner, fine tuning is automatic. If it were to fail, you would
get a scanning effect on all channels where it looks like someone is
fiddling with a fine tuning knob inside the set. I just fixed this on my
old Sony by fixing a cold solder joint on a coil.
All that other crap about marginal cables, splitters and fittings is only a
problem with low signal strength. Once boosted, even the crappiest cables
and connectors work pretty good. (ok a bad connection can show on a channel
but it is less common and can usually be fixed by tightning) If you have
more than 4 tuners attached to a cable, you need an amplifier.
Upgrading cables and splitters is like replacing the alternator and
regulatoer in your car only to find out the battery was just dead the whole
time. Take my advice and buy an amplifier before you tear everything apart.
It really does work. I have done this myself and for two friends with
On 13 Dec 2005 08:24:07 -0800, firstname.lastname@example.org wrote:
Hook up that tv somewhere else and you';ll have an answer. Why stop
with only half of the testing?
Also, try using it with an antenna. If it only has a coaxial
connector, stick a piece of uninsulated wire an inch or so into the
hole in the middle of the coax connector.
For channels 13 and below, there is no need to change the internal
setting from Cable to Antenna. The frequencies are the same.
(Close to a transmitter, there is usually no need to use any antenna
at all except for channel 2, and maybe up to channel 7. The wire
inside the tv, from the antenna or cable connector to the tuner acts
as the antenna.)
Remove NOPSAM to email me. Please let
me know if you have posted also.
Some cable systems put the channels on frequencies that are slightly
shifted, to reduce some types of interference. Some TV's have settings to
switch to the different frequency schemes. Look options on your TV's menu
system, or a physical switch on the TV, that say "HRC", "IRC", "Special",
"Normal", etc. If you find these try changing the settings to see if one
clears up your problem.
Sounds like the signal at that particular drop of the cable is too hot for
that TV's tuner. In other words the TV's tuner is too sensitive. This can be
cause by the tuner being mistuned somewhat. It doesn't say below, but did
you hook up this problem TV to one of the other drops to see if the problem
moves with the TV?
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