1997 E36 323i - Blue LED conversion problems

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  1. 1997 E36 323i - Blue LED conversion problems 
    #1
    Dr of BMW
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    CharleyNokia's Car Details
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    1997
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    Hi guys, I got myself 3 switch circuit boards for our climate control units and some 3mm blue leds. I have managed to swap out the orange LEDs that are INSIDE the 8 main switches on the left and right. HOWEVER, when I removed the switches on my own front board to swap them for the newly changed blue switches, I can only get 4 of them to light up. And yes, ALL the LEDs are fitted the correct polarity. For those that are thinking of doing it, the ROUND side of the LED goes to the WORDED side of the switch. Takes about 5 mins to grind out the orange LED and fit the blue one.

    Left side, top 2,and right side, middle 2 come ON. I thought maybe the non lit ones were blown, so used an led touching its legs against the pins on the back of the board to see if that lit up. It did not light. SO touched it onto the pins of the switches that WERE lit, it DID light up. So theres no power to the non lit switches. I accidently shorted a couple of the pins that weren't lit up togther, and the rest of the UNLIT leds lit up. Whats going on?? SO, ALL the LEDs in the switches DO work, just the unlit ones don't light up when they should.

    I thought I had blown something on the board, so yes, I CUT the 2 ribbon cables to the switch panel, and swapped over all the blue led switches onto a 2nd board, and the same thing is happening with that one too now.

    Left side top 2, right side middle 2. Anyone got any ideas? I've just a BIN from CRM on EBay for another control panel. I don't want to start working on that one till I find out what the problem is. Once I get the problem resolved, I can start converting the spare orange LED switches from the other boards I have to blue LEDs, and and convert some other units then.

    Also, have taken apart a 2nd headlight switch to see whats involved in that one. Has an orange diffuser/light carrier which the light mode sticker is stuck to. A new clear diffuser needs to be made for that one. Is this more hassle than it's worth? Put pics up later to show you.
     
     

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    #2
    Dr of BMW
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    CharleyNokia's Car Details
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    Here are some pix.







     
     

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    #3
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    E36Coupe328's Car Details
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    Almost sounds like the rest have the anode and cathode reversed but..... that doesn't add up.


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    #4
    Dr of BMW
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    CharleyNokia's Car Details
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    Yeah, I know, but I checked to make sure, and tall the LED's are in the same direction. When you press the white square down, that reveals the side of the LED with the flat bit, all of which are facing the blank side of the switch. I even removed one of the non lit switches, and put it in place of a lit one, and it came on fine.

    Thing is tho, the pics you see are of the 2nd board. the first board was my own unit, which WAS working fine, but lit up as you see it now wth the 4 unlit LED's in the SAME positions. I thought I maybe damaged the circuit, resistor or something on board #1, so removed everything and changed to this board,#2, and its the bloody same!!

    What a waste of time.
     
     

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    #5
    Dr of BMW
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    CharleyNokia's Car Details
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    Been up till now messing around with the stupid thing, and I think I've blown the lcd somehow now. It's not lighting up OR displaying anything, and none of the little green lights are coming on and the fan is blowing at near max. The only button that actually works now is the front screen demister. Still only the blue lit switches come on as before, 2 on either side so still no joy with that one. I don't know if possibly the LED's are taking too much power from the board, so only half of the led's are lghting up. I'll have to test the voltage at the led pins when the good unit arrives.

    I think anyone who is contemplating doing this LED conversion should think very carefuly about startingit, have 1 good working unit for back up, and have lots of patience.

    I shall wait for the good one to come from CRM, and fit it and leave it be.
     
     

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    #6
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    Have you tried reversing one of the LEDs in the dead switches just as an exercise?

    Good job you have a spare board. oards can easily have static damage or latent failure if proper static handling isn't observed but sometimes it's devil and the deep blue


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    #7
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    Ok, I just rove home from sister's place, was getting dark, so obviously turned the lights on, and guess what. Yup, you guessed right, the bloody blue led's lit up, all of them!!! So now I know all the LED's are in the right way round, and they do actually light up, just the green 'function 'on' led's don't light up, and theres no display on the screen.

    Admittedly, one must say, they DO look rather cool. Here are some pics of them on.


    [IMG][/IMG]


    [IMG][/IMG]


    [IMG][/IMG]


    [IMG][/IMG]
     
     

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    #8
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    jay_mz89's Car Details
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    hey, I'm looking at doing this to my heater controls, I've already done the OBC all blue but I've not yet worked out how to replace the bulbs behing the heater illuminations and also the 5 or 6 behing the LCD are amber coloured and can they be changed? they are SMD type bulbs though.
    Cheers, Jay

    Siamoto copy air filter + cold air feed, 328 exhaust, 12" steering wheel,
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    Projector indicators, 6k angel eyes, 4300k dipped beam, SMD 3rd brake light, smoked repeaters and tail lights, SMD number plate bulbs, SMD courtesy lights
     
     

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