All TVs in house have no signal
 

All the TVs in my house have Freeview built in and were working fine until we bought a new TV for the lounge.
We unplugged all the wires from the old TV and reconnected them to the new one. The lounge TV also has Sky.
We tried to tune the new TV's freeview and got a NO SIGNAL message, but what's more - the other TVs also now have no signal.
What have we done wrong?? Can anyone help - please!!

Re: All TVs in house have no signal
 

Silly question, but have you tried re tuning? :)

Re: All TVs in house have no signal
 

It would be a pretty enormous coincidence if their local transmitter's frequencies all changed at the exact moment they installed a new TV in the lounge - which is the only thing that could be fixed by a re-tune. It is more likely that the new TV is interfering with the signal in some way.

Dasher, can you confirm that there is a direct connection between the aerial cable coming down from your roof, and the back of your new TV?

When you unplugged everything, did you have an amplifier involved with your TV signal at all? If so, have you plugged that back in and switched it on?

If you completely unplug everything from the back of your new TV, do you get your signal back on the other TVs in the house?

Re: All TVs in house have no signal
 

There have been a few changes recently. In fact, I got a message that I should retune my box just last Thursday. So, while unlikely, it's not impossible.

Re: All TVs in house have no signal
 

I have tried to retune all TVs. If I totally disconnect the lounge TV from the aerial still nothing upstairs gets a signal. I bought a new amplifier today but still no good. The amplifier is connected to the lounge TV.

Re: All TVs in house have no signal
 

Was there an amplifier connected to the system previously? Is there an amplifier up on the aerial mast or in the loft and if so, is it still plugged in and switched on?

Re: All TVs in house have no signal
 

There was an amplifier before. No one has been in the loft to change anything or switch anything off.

Re: All TVs in house have no signal
 

Right ... So, "something" has caused something else to get broken, during the course of all the unplugging and installing you have been doing.

I'm not sure what you mean by "there was an amplifier before". Where was it, what was it connected to, and why isn't it there now?

We need to break this problem down into its component parts in order to discover where the problem is. You have an aerial on your roof, with a single cable coming down from it. At some point, that cable is split, almost certainly via a powered amplifier, which allows the signal to then be run by multiple cables to the other rooms in your house.

So, where is that amplifier? Is it the one that you had "before" or do you know there to be one in the loft? You need to check and ensure that you still have a working amplifier at the point where the single aerial from your roof is split off for the various rooms in your house.

Re: All TVs in house have no signal
 

Duff amplifier or a short circuit in one of the plugs is a possibility.

Re: All TVs in house have no signal
 

Absolutely, but give that this all occurred when he pulled everything apart and put it back together again, I think the most likely answer is that he's not put it all back properly. I'm wondering whether the amp he had "before" was receiving the signal from the aerial and then shunting it out to the rest of the house.

Re: All TVs in house have no signal
 

what I had before was a white ish box powered by electricity. It was behind the lounge TV. The aerial came in through the wall and was connected to this box. Then another aerial lead was also connected to this box - the other end of which went into the TV. when we connected it all back up to the new TV we had no signal. The green light didn't come on when it was plugged in so have guessed that it faulty. but even when I didn't connect it to the TV nothing else upstairs got a signal.
In an attempt to sort the problem out I went to screw fix and bought this as a replacement
http://www.screwfix.com/p/labgear-sc...pply-12v/80459

the green light on this does come on but we still have no signal on any TV. I can't imagine that this can be a problem with anything in the loft because no one has been in there to mess about / unplug anything. this problem literally happened in the time it took me to disconnect one TV and re connect the new one

Re: All TVs in house have no signal
 

The problem is, you have discounted the possibility of there being a problem in the loft without actually checking. As you still have a problem and nothing else you have tried has fixed it, you need to stop discounting the remaining possibilities simply because you don't see how they might apply.

If you can't lay your hands directly on the problem you're going to have to go right back to basics, by connecting one TV from upstairs (because you know that those TVs actually work) directly to the cable that comes down from the aerial. If/when you establish that there is a good signal coming from the aerial you can then put everything back one piece at a time until you discover which part is breaking everything else.

Based on what you have said so far, my own suspicion is similar to that posted above by nodrogd - there is still a broken amp in your set-up somewhere. As you have had a faulty amp behind the TV as well, it is possible that it has power surged as it has failed, and passed on the surge, damaging other equipment in the process.

However, whether this is the answer, or something else, you are only going to discover the problem by a patient and thorough process of elimination - and that doesn't include failing to check things because you don't see how there could be anything wrong with them.

So, go and get in the loft. ;)

Re: All TVs in house have no signal
 

what am I looking for in the loft? Something that would be plugged into the mains?

Re: All TVs in house have no signal
 

Typically, if you have TVs in more than one room all connected to the same rooftop aerial, then there will be one cable coming down from the aerial into the loft, where it connects to a powered distribution amplifier. Such an amplifier also has several outputs, one for each room where you find an aerial socket.

So you're looking firstly for the cable that comes down from the roof, following it hopefully to where it disappears into an amp. The amp will also have a mains cable attached and, hopefully, some way of determining whether it is working (a power light, for example).

Find that and make sure it's switched on and all the cables are securely in place.

Re: All TVs in house have no signal
 

Just noticed the amp that the OP has linked in post 11 is a masthead driver, so assumedly there must be a top unit at the aerial end driven through the coax. If this has failed there will be no signal in the main downlead anyway. Most people leave these amps powered 24/7, so if you turned it off (as you should) to change the connections & then turned it on again, this may have triggered a fault.