Struggling with a soldering job, need help.

[Faileng]

Hello, although I've never been formally taught soldering techniques, etc... I've not really run into too much trouble soldering, with the exception of this job...

I've got a supposed blown transistor on my fuel pump on my car and I'm trying to replace it. It's a gel encased circuit booard with very fine connections. Please see photo uploaded.

I've cleaned up the area that I'm working on with alcohol scraped off the wires, etc..

I cannot get any solder to now stick any of the connections, I've used various grades of solder and flux combination, nothing seems to work, can someone help me out with this?

Many thanks,

[sam_sam_sam]

Re: Struggling with a soldering job, need help.

First of all you need to clean the terminals with very fine sand paper but do not carry away with doing this or if you have a ( preferred method ) —> cloth power tool wheel clean the terminals until they shine

[R_J]

Re: Struggling with a soldering job, need help.

Those look like aluminum wires, you will have a hard time soldering them. I don't see how you are gonig to replace a transistor die, that is not a printed circuit with transistors installed on it.

[stj]

Re: Struggling with a soldering job, need help.

soldering to ceramics needs silver loaded solder or the pad can disintegrate.
to solder to aluminium and other tricky metals you need a flux-core with Halide in it.

[Faileng]

Re: Struggling with a soldering job, need help.

Thank you for the replies, I am replacing the blown transistor with a surface mount one.

So far I have cut the Alu wires and cleaned the board up I will try with silver loaded solder

[Spider1211]

Re: Struggling with a soldering job, need help.

From the picture, it looks like bonded wire. Can you please highlight on the picture where exactly are you planning to solder?

If its an aluminium substrate/solder pad, you wont be able to solder using conventional methods. I'ld go for conductive glue/epoxy in that case.

Something like this: https://www.henkel-adhesives.com/in/...adhesives.html

[sicilianul]

Re: Struggling with a soldering job, need help.

Have you done it ? I have same VP44 pump and I can help you