led's faint glow when off. - Page 3

suzublu · 11th September 2017, 16:02

Here you go Mick, no flicker either

VVC-Geeza · 11th September 2017, 21:51

Thanks Ronnie,big improvement

75 tinkerer · 11th September 2017, 23:20

Does the brightness of the dim LEDs increase with the temperature of whichever control box is driving them? I assume they're driven by MOSFETS and they do leak a bit, especially at elevated temperatures.
You can't just connect an LED across the mains, there'll be electronics involved including capacitors. I suppose there might be enough charge stored to illuminate the LED very briefly.
Discuss!

VVC-Geeza · 12th September 2017, 17:22

Quote:

Originally Posted by 75 tinkerer

Does the brightness of the dim LEDs increase with the temperature of whichever control box is driving them? I assume they're driven by MOSFETS and they do leak a bit, especially at elevated temperatures.
You can't just connect an LED across the mains, there'll be electronics involved including capacitors. I suppose there might be enough charge stored to illuminate the LED very briefly.
Discuss!

This is the glow that remains in the interior light on my 200 coupe (12v) and it is constant.I'm pleased to say it hasn't caused any battery drain after not using the car for four days.The car started fine.

Avulon · 12th September 2017, 21:02

Quote:

Originally Posted by VVC-Geeza

This is the glow that remains in the interior light on my 200 coupe (12v) and it is constant.I'm pleased to say it hasn't caused any battery drain after not using the car for four days.The car started fine.

That's a bit more of than just a glow if you can see it in daylight - There's still enough voltage there to keep it lit. I've no idea of the switching circuit on that but it's not shutting off properly. Have you probed the supply to the light with a voltmeter to see what voltage is present? It only has to be a couple of volts to light the led like that.

VVC-Geeza · 13th September 2017, 14:47

Quote:

Originally Posted by Avulon

That's a bit more of than just a glow if you can see it in daylight - There's still enough voltage there to keep it lit. I've no idea of the switching circuit on that but it's not shutting off properly. Have you probed the supply to the light with a voltmeter to see what voltage is present? It only has to be a couple of volts to light the led like that.

Voltage present is 4.8V and is enough to partially light half of the bulb.

Do you agree with the explainations given in post #1? That there is always 'some' voltage present in car electrical circuits even when off.

Arryhall · 13th September 2017, 15:31

That doesn't look right to me! The "glow" of my GU10 lights is more an incandescent glow, barely visible in daylight at all unless you really look for it. Certainly not specific LED's lit up. I'd suggest summat ain't right there.

VVC-Geeza · 13th September 2017, 15:56

Quote:

Originally Posted by Arryhall

That doesn't look right to me! The "glow" of my GU10 lights is more an incandescent glow, barely visible in daylight at all unless you really look for it. Certainly not specific LED's lit up. I'd suggest summat ain't right there.

I have to say that the camera picture exposure is making the lit led's appear much brighter than they actually are when viewed in the car.I would have expected all led's to light to some extent though when voltage is there

Randyjim · 14th September 2017, 12:14

For what it's worth my 1998 VVC Coupe behaved the same way.
I fitted footwell LED's, connected in parallel to the std interior light, and these definitely stayed dimly lit all the time. I can't remember if it was exactly the same for the original light though.

It's almost 6 years since she was sidelined by another HGF (3rd in my ownership), and most of the loom is now on the back seat, otherwise I'd check for you!

VVC-Geeza · 14th September 2017, 12:39

Quote:

Originally Posted by Randyjim

For what it's worth my 1998 VVC Coupe behaved the same way.
I fitted footwell LED's, connected in parallel to the std interior light, and these definitely stayed dimly lit all the time. I can't remember if it was exactly the same for the original light though.

Thanks for that.There was definitely no glow from the OE halagen bulb on mine.

Quote:

Originally Posted by Randyjim

It's almost 6 years since she was sidelined by another HGF (3rd in my ownership), and most of the loom is now on the back seat, otherwise I'd check for you!

Sorry to hear that,sounds like the underlying issue for the failure is not being addressed.Plenty of help available over on the RCOC

11th September 2017, 21:51	#22
VVC-Geeza This is my second home 2005 Connoisseur SE 1.8 Turbo,2004 45 1.8 Connoisseur and my beloved 1998 VVC Coupe. Join Date: Nov 2009 Location: Derby. Posts: 8,758 Thanks: 2,022 Thanked 1,016 Times in 739 Posts	Thanks Ronnie,big improvement __________________

11th September 2017, 16:02	#21
suzublu This is my second home rover 75 1.8 vvc club se wedgwood blue Join Date: Aug 2009 Location: Seaton Carew Posts: 26,920 Thanks: 65 Thanked 7,142 Times in 4,642 Posts	Here you go Mick, no flicker either

11th September 2017, 23:20	#23
75 tinkerer Regular poster Rover 75 Tourer Join Date: Mar 2013 Location: Darlington Posts: 95 Thanks: 12 Thanked 10 Times in 9 Posts	Does the brightness of the dim LEDs increase with the temperature of whichever control box is driving them? I assume they're driven by MOSFETS and they do leak a bit, especially at elevated temperatures. You can't just connect an LED across the mains, there'll be electronics involved including capacitors. I suppose there might be enough charge stored to illuminate the LED very briefly. Discuss!

13th September 2017, 15:31	#27
Arryhall Loves to post Rover 75 Join Date: Mar 2017 Location: Biddulph Posts: 486 Thanks: 101 Thanked 145 Times in 90 Posts	That doesn't look right to me! The "glow" of my GU10 lights is more an incandescent glow, barely visible in daylight at all unless you really look for it. Certainly not specific LED's lit up. I'd suggest summat ain't right there.

14th September 2017, 12:14	#29
Randyjim Regular poster MG ZT 190 Join Date: Nov 2016 Location: Gloucester Posts: 83 Thanks: 30 Thanked 25 Times in 21 Posts	For what it's worth my 1998 VVC Coupe behaved the same way. I fitted footwell LED's, connected in parallel to the std interior light, and these definitely stayed dimly lit all the time. I can't remember if it was exactly the same for the original light though. It's almost 6 years since she was sidelined by another HGF (3rd in my ownership), and most of the loom is now on the back seat, otherwise I'd check for you!