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Subject Topic: Swapped My Halogen For LEDs
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Message posted by Dyson+Co on 18/4/2014 at 9:03am
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Morning All,
Some time since I last posted
I have just replaced both my main ceiling light and a reading light with LED's - they work really well, no problems. I then replaced the recessed spots, they too worked fine.
The problem begins when I turned on the 12v TV - turn the main light or reading light on - fine ............ turn on any of the spots and it knocks the TV out - any ideas please.
By the way it was just a straight swap, haven't touched any electrics.
Any advice will be welcome

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Message posted by fleck2 on 18/4/2014 at 11:15am
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Does it turn the power off to the TV or do you just lose the picture?


Message posted by Dyson+Co on 18/4/2014 at 11:44am
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Thanks for the reply, the TV freezes then blackscreens then bluescreens (no signal/retune)


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Message posted by fleck2 on 18/4/2014 at 11:55am
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Some LEDs bulbs use high frequency electronic drivers to control the current flow. Sounds like you've got an interference problem.. You could probably suppress the interference, or just buy cheaper led bulbs.

Have you got a data sheet for the bulbs?

Message posted by iggycamper on 18/4/2014 at 3:43pm
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Few suggestions from an old 'techie'!

1. Feed TV with alternative 12v temporarily to see if interference is getting to TV rcvr via the Van's auxiliary 12v power line or via RF to the TV aerial.E.g.If possible feed TV from 230 volts mains to via it's own 12v power converter if available.

2. Unplug all new LED lights and add one at a time to see if just one (possibly faulty LED/driver as Fleck said.) is cause of problem. From your info one or all of the 'spots' could be the cause ... in which case try a different type/make.
3. What is the actual 12v reading and what make is the TV btw?

Interesting fault! Let us know how you get on!

Just for info have never seen this problem before. My current van has a total of 16 LED light units of different types and a Avtex TV normally using an internal aerial and booster with perfect digital reception. My last van I replaced halogen lights with LED ones (Lidls best!) with no TV interference.

P.s. nickname for our Spaniel is 'dyson' - never a crumb on kitchen foor!

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Message posted by Dyson+Co on 18/4/2014 at 4:06pm
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Thanks for the 'feedback' - pardon the pun

1) The TV is an Avtex

2) The bulbs were purchased from the Internet - a company that was recommended - 'Bedazzled' - they are G4-6

Going to try the TV on the mains now :)

ps ........ He was named after the hoover

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Mum, Daughter, Dyson & Bafa x

21st Birthday Tour
   AUGUST 2012
17-19 Thorpe Forest
19-21 Whitehouse Beach
21-23 Run Cottage
23-25 Clacton Coastal Academy

Message posted by iggycamper on 18/4/2014 at 5:18pm
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Tks Mr Dyson! (Won't try to de-cipher 'Bafa'.)

Guess that 'tis probably an RF signal to aerial rather than the 12v route but worth trying anyway.

Some useful info here re LED-Dab signal interference:

http://www.ledbenchmark.com/faq/LED-interference-issues.html

Have heard of 'dashcams' causing interference and/or loss of signal to DAB car radios, especially when both mounted on windscreen. (sad if you have both!!)
Usual cause is RF transmission from modern 'switched mode' power supplies which now commonly operate at similar frequencies to DAB signals. (Good design should suppress such RF interference however ....)

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Message posted by Dyson+Co on 18/4/2014 at 9:11pm
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Update - tried the TV on both 12v & Mains - no change - thought it may be the TV so tried one from the house - same problem :( - At least we know it's not the Avtex!

Changed spots back to Halogen - same problem!!!!

Put the LEDs back in - TV was erratic - either fine or breaking up when the lights were switched on?? - bathroom spots did not affect it at all tonight - yet did last night!
Note: Lights do not flicker - lighting is very good (provided TV is not on the agenda!)
Living area spots affected it one moment and not the next - can only assume that I have a 12v problem?? Upshot is have decided that I'll get the 12v all checked out at the Hab Service next week

And the real brain knumbing kick in the teeth - All lights off, TV on - working well - Ice Cream Van parks adjacent, music on and TV breaks up and not a '99' in sight!

PS: Bafa, our German Shepherd, named after a lake in Turkey (basically, as a pup - kept peeing himself, water everywhere!)

Post last edited on 18/04/2014 22:12:28

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Mum, Daughter, Dyson & Bafa x

21st Birthday Tour
   AUGUST 2012
17-19 Thorpe Forest
19-21 Whitehouse Beach
21-23 Run Cottage
23-25 Clacton Coastal Academy

Message posted by iggycamper on 18/4/2014 at 11:29pm
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Now sounds like the only other possibility now is TV signal strength and Aerial/location/position.(imho)

Does moving the aerial (if it can be moved) have any effect? Also does your aerial have a built-in booster - normal powered by 12v from the Avtex tv using the aerial co-ax lead. If so may be worth checking that also. Can you try another aerial?

Also worth remembering that digital tv generally either works well/perfect picture (even with lowish signal strength) or fails completely,unlike analogue tv where the picture could deteriorate from good to very bad without actually failing completely.

If you have lowish digital signal strength almost anything (including adjacent Ice cream van!)could cause complete/sudden picture failure. You could try measuring the digital signal strength (using the Avtex menu) - when the tv is actually working seemingly OK.
You could also do comparison with your domestic TV - but make sure you measure the same channel on both TV's.

A bit of a mystery now - if all was OK before the light replacement - so could just be the 'law of sod' that a another fault has occurred coincidentally when you replaced the lights!

Would be interested to hear if the dealer's men find anything during the habitation check - they don't usually do 'subtle' faults!

(In my technical previous life I may have also tried monitoring for noise with an oscilloscope on the 12v supply from aux battery. - just in case the charger has gone 'noisy'.)

P.s. 99's were selling well in Devon today but none hit the floor for Cassie to 'hoover'!

Message posted by Dyson+Co on 19/4/2014 at 12:38pm
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Iggy, Many thanks for your feedback, I have played about with the aerial and there is a definite signal problem, even walking past the TV can cause interference - woe betide the mobile phone ringing!

In your opinion, is this a case of looking at a new booster box? The van is fitted with the Vision Plus, Digital Amplifier VP1 and the Aerial, the Status 530?

Many thanks

Sheila


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Mum, Daughter, Dyson & Bafa x

21st Birthday Tour
   AUGUST 2012
17-19 Thorpe Forest
19-21 Whitehouse Beach
21-23 Run Cottage
23-25 Clacton Coastal Academy

Message posted by iggycamper on 21/4/2014 at 2:05pm
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Hi again Sheila

Hope you don't think me being too simplistic or stating the obvious but suggest you go back to basics as follows:
('tis what I would do!)

1. Check pointing direction of local domestic TV Antennas.
2. Check whether local aerials use vertical of horizontal polarization.(Generally Vertical only used by local transmitters in more rural/remote areas and have a smaller number of channels.)
3. Set own van aerial up as in 1.)& 2.) above and as high as possible on van. (Although I usually find my portable status aerial with built-in booster works OK even inside the van in most areas!)

4. If your Vision Plus amp is powered from TV 12v source via aerial cable(as mine is) go into 'setup' (or 'menu'? depending on model) on your Avtex TV - then cursor down until you see antenna settings etc - look on RHS of screen and ensure that Antenna power is 'ON' Most important!

5. I would normally scan/auto-retune at this point; but guess your TV is already tuned to your local frequencies?
6. Check channel 1 (BBC1)
7. Check channel 101 (BBC HD) if TV has HD tuner - note the 5 HD chans more fussy about signal strength.
8. Consider swapping/replacing the coax leads and/or connectors in case of a bad connection.
9. Note that with a good aerial in a strong signal area a booster may not be required; try your Avtex tv in house connected to normal house Aerial outlet. This will also give an indication of signal strength at your location.

10. Never felt the need for one but some folks use a RF signal finder when adjusting 'van Aerial. ( at 25+ ?)I believe there is also an App for smart phones to find direction of local TV transmitters from any location - again, not tried it.

11. When you take van in for hab. check, the dealer may just have a signal finder to test your aerial and booster - they may check it for free! (?)

Edit- sorry final thought for now - if you are in strong signal location you could try by-passing or removing the booster amp and just feed TV with aerial direct, just in case the booster itself is faulty.

Hope this helps - please let us know how you get on!

-------------
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Message posted by iggycamper on 06/5/2014 at 5:05pm
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Hi Sheila

Just wondered if you got the TV signal problem resolved?

Iggy

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Message posted by Dyson+Co on 06/6/2014 at 7:04am
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Morning - Sorry for not replying sooner - the aerial works perfectly - providing we are not in built up areas, camping at Rutland Water for the last few weeks it has been fantastic. Got home and tried the TV - no good, too much interference in a built up area.

As we don't camp in built up areas we are prepared to accept it as it is :)

Thanks again for your advice :)

-------------
Mum, Daughter, Dyson & Bafa x

21st Birthday Tour
   AUGUST 2012
17-19 Thorpe Forest
19-21 Whitehouse Beach
21-23 Run Cottage
23-25 Clacton Coastal Academy

Message posted by -mojo- on 06/6/2014 at 12:54pm
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Unfortunately this may be a symptom of the 4G mobile introduction which is under way.

It has long been known that 4G signals interfere with Freeview signals, but the clue to the government's approach to this problem is in the first four letters of "Freeview". Nobody is making huge amounts of money out of Freeview, so they don't care.

Sadly it is likely to get worse as they add more 4G transmitters and crank up the power, so if this is the source of your problem, the only places you are going to get good reception is where you cannot get 4G reception.

It wouldn't be so bad if they had not made a complete mess of Freeview via the local TV repeater network. Technically it would have been easy to make this work properly and for lots of people to have a strong local transmitter to overcome the problem. They didn't because none of their mates stand to make loads of money out of Freeview (IMO, of course).

Message posted by Dyson+Co on 07/6/2014 at 2:54pm
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Makes sense to me Mojo :)


-------------
Mum, Daughter, Dyson & Bafa x

21st Birthday Tour
   AUGUST 2012
17-19 Thorpe Forest
19-21 Whitehouse Beach
21-23 Run Cottage
23-25 Clacton Coastal Academy

Message posted by iggycamper on 11/6/2014 at 12:17am
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Had also heard of possible 4G interference but not seen any affects yet.
We have been on nearly 30 sites covering the whole country in the last year or so and have managed to get a decent freeview digital signal (normally only using an internal boosted avtex aerial) on all but about 4 locations. (3 of those provided a TV signal point on the EHU so known bad areas.)

My TV also works fine when van parked on drive in town at home - even though nearest TX is some 20 miles away, behind a hill, and other side of our house.

Last week (in North Norfolk) - reception was so good that when a coax extension lead came loose the TV still worked fine without the aerial!
As an ex Radio/Telecomms/Computer technician even my gob was truly smacked! And it also left my wife somewhat bemused considering the fuss I usually make about horizontal and vertical polarisation, direction of local and remote transmitters etc etc.
All that said of course most programs are rubbish and Scrabble is an excellent alternative!


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The older I get the better I used to be.

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