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View Full Version : did the LCD replacement DIY and now the white LEDs under the needles are not working



mrjasper3mn
11-03-2012, 09:23 AM
so i did the LCD replacement DIY and the LCD is now working properly. But after putting the cluster in and out a few times to make sure all my contacts for the LCD were correct, the LEDs under the needles stop lighting. I tested them alone with a battery and was able to turn them on
Anyone know what might be cause this? I also have an airbag light on that may or may not have anything to do with it.

k0mpresd
11-03-2012, 09:36 AM
sounds like you need to work on your soldering a bit. or look at the board for drops have solder you may have placed accidentally.
try posting some high res pictures of your cluster.

mrjasper3mn
11-03-2012, 09:52 AM
yea, no drops of solder anywhere and i have checked the fuses for this cluster but can t find anything.

k0mpresd
11-03-2012, 10:04 AM
i have done tons of lcd replacements and never the problem you describe. something is not correct on your cluster.
pictures, pictures, pictures.
you should always post pictures of your work after any soldering job if you are having problems.

Cybersombosis
11-03-2012, 11:25 AM
Did you leave any flux residue on the board at all? If you used acid flux, like plumbers use, it will cause shorts if you don't clean it off. If you take some rubbing alcohol on a paint brush and apply it to the portion of the board you were working on and wipe up the excess flux with a Kimwipe (lint free klenex), this may help in solving your problem. It did for me. Here is a video of the technique.

http://www.youtube.com/watch?v=5uiroWBkdFY

Doug

mrjasper3mn
11-03-2012, 06:01 PM
no residue and no solder left anywhere on the board. checked all the LEDs they are all working. I noticed that when i flick the turning signal talk up (right signal) the LEDs under the needles turn on...then when i turn the signal off the LEDs under the needles fades away....

cyber, what kind of problems did you have that the Kimwipe helped with?

Cybersombosis
11-03-2012, 08:51 PM
When I soldered the ribbon to the board, the LCD would work for about 8 minutes then it would glitch out and lose all information. After asking kOmpresd and pixelfix if they ever ran in to this problem and they said no, I went down to the local electronics shop and they immediately asked what kind of flux I was using. They said that the plumbers flux I used is an acid flux and conducts electricity. It's ok to use it but you have to clean up your work and remove all residue. So initially when I installed the cluster, the flux residue would be in a solid state and not short anything. Once the board got up to operating temperature, the flux would liquify and cause a short. When I cleaned it up with alcohol and lint free wipes, it worked like it should and has for around a year now.

Doug

nynoah
11-03-2012, 08:53 PM
This is why it is always a better idea to send certain things off to the specialists that do it all the time. Which is also why I am not building my bottom end and I am letting the machine shop do the honing and measuring.

k0mpresd
11-04-2012, 10:09 AM
why is it so hard to post pictures? you want advice for something when we have NO idea what the work looks like. you may not see something that is blatantly obvious to someone else.

ddillenger
11-04-2012, 02:17 PM
I think soldering is a lot like welding. While it may suffice, not too many people want to show their (amateur) attempts.

k0mpresd
11-04-2012, 02:26 PM
then dont ask questions when you have problems. no one can just telepathically know theres a short between pin 2 and 3 for example.

mrjasper3mn
11-04-2012, 03:43 PM
hey guys, sorry havent had a chance to respond. my dash is all assembled and installed. but what I randomly noticed was when i flick the turning signal stalk up to turn the right signal on, the white LEDs under the needles turn on...then when I turn the signal off the LEDs under the needles fades away....it doesnt do this when i turn the left signal on, so i think the turn signal LED is somehow connecting the white LEDs for the needles...and also the airbag light came on and hasnt gone away. ill pull the dash back out and take some hi def pics

mrjasper3mn
11-24-2012, 01:39 PM
Did you leave any flux residue on the board at all? If you used acid flux, like plumbers use, it will cause shorts if you don't clean it off. If you take some rubbing alcohol on a paint brush and apply it to the portion of the board you were working on and wipe up the excess flux with a Kimwipe (lint free klenex), this may help in solving your problem. It did for me. Here is a video of the technique.

http://www.youtube.com/watch?v=5uiroWBkdFY

Doug


why is it so hard to post pictures? you want advice for something when we have NO idea what the work looks like. you may not see something that is blatantly obvious to someone else.


hey guys, i finally got a chance to pull this thing back out and take a look at it...i wiped the entire thing with alcohol and nothing happening...any ideas?

https://lh6.googleusercontent.com/-HY6V9cAvLFo/ULE8UnSS9aI/AAAAAAAABn4/ti5w97w43jM/s800/IMAG1592.jpg

https://lh5.googleusercontent.com/-xFS61-MOkPU/ULE8UoeRZzI/AAAAAAAABn0/vmeVutFJZDs/s512/IMAG1593.jpg

https://lh4.googleusercontent.com/-k7xvvN33gGI/ULE8UifI4zI/AAAAAAAABn8/DL9QaLhwQTE/s512/IMAG1594.jpg

https://lh3.googleusercontent.com/-w7sgsfbmuaI/ULE8WSJkZqI/AAAAAAAABoM/OLm2Mk7waTk/s800/IMAG1596.jpg

https://lh6.googleusercontent.com/-DFj_db_37Tg/ULE8WZpLLVI/AAAAAAAABoQ/bqQZ5OJKfVk/s800/IMAG1597.jpg