Re: Ebay "don't let this hairy repair scare you"

when you consider that simple static electricity can fry an IC, and you see
what has gone on with that board, it freaks you out. then again, hey, if it
works now, it might be okay for a while at least, at least in HUO.



--
billb
<Pinthetic@xxxxxxxxx> wrote in message
news:1129013160.661858.82700@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> are those power transistors supposed to look charred like that?? I
> don't do
> electronics so i don't know.
>
> --
> billb
>
>
> They can look like this depending on the vendor. As you pointed out
> heat can make them look like this also. As I stated in the OP, the
> auction is fine, everything is disclosed, hats off to someotherplace
> for doing it right. You guys picked up nicely on what I intentionally
> did not elude to, and that was the recent "servicing" by a well
> advertised repair shop. They let that board out like that? Maybe, it
> came in like that and they did not work on that section. No one is
> really talking.
>
> That repair makes me think that the pads under those 20 pin chips are
> really damaged. They are also in a tight layout. Laying down new
> traces is difficult. The other thing is the repairs are on the chip
> legs. This is pretty much a no-no. You don't want to heat these IC's
> unevenly. During wave soldering heat is evenly dispersed and usually
> there is top side cooling. (At least on our old machine there was).
> Heating one pin can cause thermal stress on the package. The other
> thing is to replace a chip you have to rejumper. As many of you know
> these jumpers should be on the backside of the board. You can use long
> pin sockets and wrap the pin legs. If you have more than one landing
> you can silicone a small piece of a single sided Radio Shack project
> board to the back and land several connections with individual runouts.
> To each his own.
>
> Just hurts to see it that way.
>
> Mario
> Pinthetic
>


.

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