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Reglue flat wire ribbon cable on circuit board

 
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Peter A
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PostPosted: Wed Jan 28, 2009 7:29 am    Post subject: Reglue flat wire ribbon cable on circuit board Reply with quote

I have a device with a low voltage flat wire ribbon cable that links a circuit board to an LCD display. The cable was glued to the circuit board. The glue appears to have dried out and the cable is now detached. Any advice on how to reattach (I can align the wires in the circuit board to the cable, so this is not a problem). (I suppose I would need a glue that would conduct electricity? If so would there be a "bridging" problem?).Thanks!
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA

PostPosted: Wed Jan 28, 2009 6:28 pm    Post subject: Reply with quote

You would not want any conductive glue for attachment of a ribbon as it will effectively bridge every trace?. I have never seen a ribbon-to-pcb connection only by means of glue?---it is normally used more as a re-enforcement of the connection.
Not to say that it does not exist but for proper electrical connection, you need more than just glue.
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Thu Jan 29, 2009 7:55 am    Post subject: Reply with quote

There are in fact cases where flat cables or flexible PCBs are glued in place. Mostly when one of the cable ends is connected to something that cannot withstand solder heat, i.e. a LCD display with electroluminiscent (EL) backlight. But in those cases, a small glue dot is screen printed on each pad of the PCB, like the solder paste for mass production of SMD assemblies. This is very difficult, not to say impossible, to do in a repair shop.
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