Originally Posted by rdog14
After a lot of searching and reading related problems I need some help.
Some of the illumination lights in my instrument cluster burned out and I attempted to upgrade to LEDs. I went with direct replacements for the #103 lamps complete with built in resistors from superbrightleds.com. I believed them to be installed correctly. The first time I turned them on the cluster fuse, #17, under the dash blew. After replacing the fuse, the cluster works again, but not the backlights do not. Backlighting no longer works with the old incandescent lamps that had previously been working. Each of the LEDs work in test circuits. Pulling the cluster apart I found damaged parts on the circuit board. I think the MOSFET transistor that controls the backlight dimming is fried.
Has this happened to anyone else after changing to LEDs?
Does anyone have the technical diagram of the circuit board so I can reference it?
Has anyone attempted to replace this transistor before?
Is this a lost cause and I am stuck getting a replacement cluster?
Thanks for your help,
I have tried to replace some of my lamps to LED, but only to use up the blue LED's I had left over.
I was trying to find the red lights, to change to purple, but they must be buried inside. I was using the PC 74's.
Have never had the cluster apart. If you can find the transistor at Radio Shack, or an electronics store, you can try replacing it.
I did not have ny problems on my gauge cluster, except trying to find the lights I was looking for.
You could probably find a gauge cluster at a local junk yard or on ebay.
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