Soldering onto conductive paint

[paulmorison]

Hi All
I have a Roland 80017A chip that has lost one of its legas and solder pad that the leg solbers onto
Can i use a conductive paint (suspended aluminium particles, Bare Paint or any other kind of paste/solution to cure this

Cheers all
V

 

[Mooly]

Well a search tells me the IC is a single in line special. When you say its lost a pin do you mean its snapped off near the package ? Even if it has I bet you could solder a single strand of wire to whatever is left of the old lead, even if its flush with the package. Then put a tiny dab of epoxy over the connection and run the strand of wire through the PCB hole and scrape and solder to the print it connected to.

I wouldn't think conductive paint a good solution tbh from what you describe.

 

[mickeymoose]

I had not thought of soldering to conductive paint. So I tried (GC 22-207). It no work! E

 

[sofaspud]

I would follow Mooly's procedure, but I would first use an Exacto to remove some of the plastic from around the broken pin. You don't need much, and can probably get ~1mm cleared without destroying the package integrity. Then run the wire to the former pad connection. ("Solder pad" doesn't confirm whether this is through-hole or SMT.)

 

[Andersonix]

Aren't there conductive epoxies out there? Not that you would solder to it, but rather 'glue' the joint back together...

 

[geraldfryjr]

Yes there are conductive Epoxy's, But the last one I used was so thick I could barely get it out of the squeeze tube.
I still have it but it is a solid rock now!! He,he,he

You can try gluing the end of a piece of wire-wrap wire using some conductive paint and solder the other end were it needs to go.

I have used this method a few times and it works well.
Here is one such instance,

http://www.diyaudio.com/forums/planars-exotics/196631-apogee-speakers-construction.html#post3409337

That one was done using a Silver Paint pen in 2002.

Another time (buried in these threads) I I used some Nickel print and also a rear window defogger repair kit ( copper paint) to make a connection to a broken off of a Aluminium wire mesh tab on my DIY Esl.

Both are still holding and still working to this day.

jer 🙂

 

[JonSnell Electronic]

Broken legs are a real problem with the poor design of these chips.
There is a solution, See;
80017A VCF VCA JUNO-106 VOICE CHIP FILTER IC REPLACEMENT
Hope this helps