heater panel led
Discussion
ive got a led not working on my heater panel in the griff.being one of those fussy gits who has to have everything just right and working properly i thought id take a look.the led in question is the re-circ round shape green one by the lower left re-circ knob.although the led is dead theres 12v there,all the other leds on the board seem to be 2v only.id like to know if this is the correct voltage?how do i test the led using the diode symbol on my multimeter(ie what am i looking for)?and does anybody know the resistance values of the colour coded lines of red and gold?is this board worth getting repaired and if so who could anybody reccommend to repair it please.also what is the cost of replacement?all help greatly appreciated-mv
>>> Edited by mongoose on Tuesday 6th January 14:21
>>> Edited by mongoose on Tuesday 6th January 14:21
I can't remember what the green one is for but it's either heated seats or air conditioning. If you don't have the appropriate option (as I don't), it won't come on. That is unless you mean one of the two (one being round, one triangular) that actually signify the recirc control in which case it should be on with the ignition.
You need to disconnect the LED from the circuit board to test it in a multimeter (and they're easier to test by just applying the appropriate voltage in the correct polarity, incorrect polarity won't damage it as it's a diode).
Resistor colour codes are Black - 0, Brown - 1, Red - 2, Orange - 3, Yellow - 4, Green - 5, Blue - 6, Violet - 7, Grey - 8, White - 9 (I think). The band spaced at the other end away from the other ones is the tolerance (gold or silver IIRC) and the last band in the sequence (one in from the tolerance) is the number of 0's to add to the end. All info available on the web.
I wouldn't mess with it personally unless you are sure it's supposed to be on. If so, it should be fairly simple to test the LED and replace it if necessary.
Ian A.
>> Edited by IPAddis on Tuesday 6th January 13:24
You need to disconnect the LED from the circuit board to test it in a multimeter (and they're easier to test by just applying the appropriate voltage in the correct polarity, incorrect polarity won't damage it as it's a diode).
Resistor colour codes are Black - 0, Brown - 1, Red - 2, Orange - 3, Yellow - 4, Green - 5, Blue - 6, Violet - 7, Grey - 8, White - 9 (I think). The band spaced at the other end away from the other ones is the tolerance (gold or silver IIRC) and the last band in the sequence (one in from the tolerance) is the number of 0's to add to the end. All info available on the web.
I wouldn't mess with it personally unless you are sure it's supposed to be on. If so, it should be fairly simple to test the LED and replace it if necessary.
Ian A.
>> Edited by IPAddis on Tuesday 6th January 13:24
thanks for the reply ian.the led im refering to is the re-circ,small,round led and not the air-con one.it used to light up but now doesnt.whats confused me is that im finding 12v at the led when all others are 2v only.would this blow the led or just prevent it from working?if it shouldnt be 12v then id like to find out why it is 12v and would test some of the other components in line-hence my request for resistor codes.cheers-mv
As I remember, you remove the heater panel by taking out the window switches and undoing two bolts. Details in the bible.
As for the LED, I looked this morning (noticing that the green air-con LED that I mentioned is nowhere near the air-con control) and found the small circular one you are talking about. I think you might have some problems trying to obtain the right size and shape replacement LED. TVR will probably just sell you the entire panel.
I'm not sure why you're measuring 12V on the blown LED and only 2V on the working ones. It might explain why the LED has blown if you're suddenly getting lots of extra voltage. Very rare for resistors to fail in this way (I think they usually fail open circuit which would give you 0V) though AFAIK.
Can't remember what voltage the LEDs should be. You could always try buying a 12V LED (about 25p) and see if that lights up? Failing that, a call to TVR can actually be quite productive if you speak to the right person.
Ian A.
As for the LED, I looked this morning (noticing that the green air-con LED that I mentioned is nowhere near the air-con control) and found the small circular one you are talking about. I think you might have some problems trying to obtain the right size and shape replacement LED. TVR will probably just sell you the entire panel.
I'm not sure why you're measuring 12V on the blown LED and only 2V on the working ones. It might explain why the LED has blown if you're suddenly getting lots of extra voltage. Very rare for resistors to fail in this way (I think they usually fail open circuit which would give you 0V) though AFAIK.
Can't remember what voltage the LEDs should be. You could always try buying a 12V LED (about 25p) and see if that lights up? Failing that, a call to TVR can actually be quite productive if you speak to the right person.
Ian A.
IPAddis said:
Resistor colour codes are Black - 0, Brown - 1, Red - 2, Orange - 3, Yellow - 4, Green - 5, Blue - 6, Violet - 7, Grey - 8, White - 9 (I think)
Just thought Id let you know that you think correctly!
Black Bastards Rape Our Young Girls But Virgins Go Without.
Thats the why its remembered in the trade
LEDs 'drop' a certain voltage, notmally 0.7v or more.
So (and now I'm guessing) it sounds like your 'healthy' LEDs are dropping a correct 2v, but that the LED in question is duff. It's not passing any current and so you're seeing a full 12v. If the resistors are in series with each LED then the remaining 10v will be dissapated across these.
So (and now I'm guessing) it sounds like your 'healthy' LEDs are dropping a correct 2v, but that the LED in question is duff. It's not passing any current and so you're seeing a full 12v. If the resistors are in series with each LED then the remaining 10v will be dissapated across these.
IPAddis said:
Black Bastards Rape Our Young Girls But Virgins Go Without.
Thats the why its remembered in the trade
I was taught "Bad Boys" but the rest is the same. Didn't want to admit to using that to remember it though!
The PC and John Logie Baird version is:
Bye Bye Rosie Of You Go Birmingham Via Great Western
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