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'Pcb VIAS !?!?!?'
1999\04\15@080117 by Goovaerts

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Hello, a very urgent question !! The vias on a pcb are the holes to connect
a line on the top of the pcb with a line on the bottom of te pcb ! When you
get you design back from the electronics shop, do you have to put solder in
the vias also. I had the pcb drilled and tinned in the shop already, but I
get the feeling that there is no solder (through) in the vias !!

Please reply,

Glenn

1999\04\15@084107 by TrionicIan

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In a message dated 99-04-15 08:01:50 EDT, you write:

> Hello, a very urgent question !! The vias on a pcb are the holes to connect
>  a line on the top of the pcb with a line on the bottom of te pcb ! When you
>  get you design back from the electronics shop, do you have to put solder in
>  the vias also. I had the pcb drilled and tinned in the shop already, but I
>  get the feeling that there is no solder (through) in the vias !!
>
The holes should be plated through ... this is enough to carry reasonable
currents (consider the plating to be same thickness as PCB, so the "track
width" is the diameter of the hole).

For big currents, or for high reliability (plating through can give problems
sometimes, just like PCB tracks can be bad) then solder the holes.

For our product, we solder the holes (done automatically in wave solder, so
stop water getting through the holes and underneath SMT components!

Ian C.

1999\04\15@093313 by Sebastián Dols

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the vias usually are filled with a conductive material bonded to the hole
walls or (more usually) the hole is copper plated. If there is no contact
between upper and lower layers you must create it with the component pin
soldered up and down, or place a little piece of cable and solder up and
down (but is a very bad quality manufactured board if that operation is
needed)

keep on PICing

/S

{Original Message removed}

1999\04\15@221845 by Goovaerts

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>the vias usually are filled with a conductive material bonded to the hole
>walls or (more usually) the hole is copper plated. If there is no contact
>between upper and lower layers you must create it with the component pin
>soldered up and down, or place a little piece of cable and solder up and
>down (but is a very bad quality manufactured board if that operation is
>needed)

It was needed !!!!!! Now, another question :

an idea to fix a via that has come off the pcb. I didn't wanted to trie
superglue, it's so unprofessional, you know !!!!! Something else ???

1999\04\16@043637 by Sebastián Dols

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>>the vias usually are filled with a conductive material bonded to the hole
>>walls or (more usually) the hole is copper plated. If there is no contact
>>between upper and lower layers you must create it with the component pin
>>soldered up and down, or place a little piece of cable and solder up and
>>down (but is a very bad quality manufactured board if that operation is
>>needed)

>It was needed !!!!!! Now, another question :

>an idea to fix a via that has come off the pcb. I didn't wanted to trie
>superglue, it's so unprofessional, you know !!!!! Something else ???

I've used some time ago a conductive epoxi from NURAL (nural sells products
based on numbers, as nural 77, nural 55.. and there is a nural XX who is
conductive if I remember well. Sorry about the undefinition..). If you are
not *very* concerned about the Amps (little more ohms ->> little more watts,
you know) in that via you can try it.

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