Hi all,

I'm trying to repair a circuit board made by delaval that should live in my milking robot .........

I think a failed regulator (lm317) went over the top first and cooked a couple chips on the board.

Most are no problem thanks to eBay as most are now discontinued (a couple old d latches)

I disconnected all the available chips first (Stanley knife through vcc pin ) but still couldn't find the short. One chip I can't find had lots of connections to vcc so I got the hot gun on its backside (all pdips) and gently tried to lever it off when the solder went shiny.

The package fell apart with very little force on it, most times I've removed pdips like this they come out easily.

It was the culprit, my board now has 650 ohms across the supply which is the same as the working board, instead of 15 ohm short.

Question is, I think I have another less important bit of kit with the same chip in it, do folks think the package fell apart as the chip had failed ? It's likely a custom chip and while I'd like to sort this I dont want two of them ruined, but would be prepared to lose one if I could get the other to work and could get the chip out in one bit?

Thanks Geoff

 

To update this ....
The chip is on a bus, more modern parts have a soic part in them, same pin count.
Pdip is 3609-001
Soic is 3609-002

A firm called worldwayelec have some, has anyone delt with them? They are in China I think.

Cheers Geoff

 

Do you expect to discuss this with no schematic?

 

I probably didn't word my question very well!
Was more wondering if a failed dip package is more likely to crumble when your trying to remove it?

I've taken off quite a few without any problems but this one just fell apart! I thought maybe that make of chip might be more prone to falling apart?

As it turns out I can only find soic packaged parts on my other boards.

I don't have a schematic for this board and it's covered in thick varnish so is tricky to map out with a meter.

Thanks Geoff