Fixing a "leg" of 68010 chip

[mk1]

Hi,

my CDTV upgrade project is not going too well I suppose. I bought one of the 010 chips and started installing it. I noticed that one of the "legs" of that chip was rather loose and slightly bent. Moving it back to its position it snapped off from the chip itself right from the joint where the metal and the chip connect.

So, I guess what I'm asking is, has it gone to the Motorola heaven or is there a way to fix it? How important are those legs for the chip anyway, as in any chances for it to work without one?

[musashi5150]

I'd say it's pretty important

You could melt back part of the plastic with a soldering iron to get just enough to solder a link to. You would then probably need to hardwire it to your CDTV socket though.

[mk1]

Ok, umm.. what exactly do you mean by hardwiring? *blush*

[musashi5150]

Soldering the new wire (from the leg you broke) to the CDTV motherboard/CPU socket. It now isn't really removeable anymore.

[mk1]

Why would one need to solder it to the mainboard? Wouldn't it be enough if you just manage to solder the leg back to the chip?

[DH]

Originally Posted by mk1

How important are those legs for the chip anyway, as in any chances for it to work without one?

Would you function properly without one of your legs

I wouldn't fancy your chances on fixing it, but then again, your CDTV ain't going to work if you don't try. Maybe you could get a replacement from wherever you bought it from, after all, it was already damaged before you recieved it.

You haven't got a chance on successfully soldering the leg back together. Even if you did manage, it isn't going to be very secure

[mk1]

Originally Posted by DemonHellraiser

Would you function properly without one of your legs

Hey, come on! If I had 64 legs I'm sure I could spare one!

I wouldn't fancy your chances on fixing it, but then again, your CDTV ain't going to work if you don't try. Maybe you could get a replacement from wherever you bought it from, after all, it was already damaged before you recieved it.

You haven't got a chance on successfully soldering the leg back together. Even if you did manage, it isn't going to be very secure

Yeah, I guess that's my only chance and I'm going to try for sure. It's just that I already left feedback on eBay and all so I don't think the guy's gonna give me another one very easily.. I bought it from the seller who seems to have one for sale every week.

[DH]

This happened to me some years back 'n' I'm experienced in soldering, down to the surface mounted stuff, and I had enormous trouble + I ended up burning the IC out with the heat from the iron. This is where you're going to have serious trouble, although you may fix the leg back on, you may have already caused irreparable damage to the IC

[FOL]

Originally Posted by mk1

Hey, come on! If I had 64 legs I'm sure I could spare one!



Yeah, I guess that's my only chance and I'm going to try for sure. It's just that I already left feedback on eBay and all so I don't think the guy's gonna give me another one very easily.. I bought it from the seller who seems to have one for sale every week.

You should be able to solder a wire / resistor leg to the joint, I have done this alot of times in the past. Exactly as musashi5150 stated.

[DH]

I agree with musashi5150 & FOL, the leg is pointless, but a resistor leg sounds like a real good idea . Just be careful if you try it yourself

[mk1]

Any ideas who else might be willing to try fixing this?

Oh yeah, all this reminds me of this: http://eab.abime.net/showpost.php?p=525317&postcount=12

[Zetr0]

@mk1

assuming your skill level, I would suggest that you attempt cutting back the plastic casing and then sodering a wire to the exposed damaged pin (now a stub) remember to use flux and clean it after use...

Use a short length of thin (COPPER) wire, the last thing you want is introduce any micro-delays on an address or data line!

Tin the end of the wire so that you can plug it in snuggly into the slot! (use flux )

----------------

for the more experienced method. use a cut down steal pin, heat iron to 430c lots of flux, load iron with a good blob of 0.7 solder (thats the thick stuff). Place this onto the cut down pin, now that you have a good blob on the pin, cooled nicely, you can then cut back a little plastic from the cpu casing and put some more flux on the stub... using a pair of pliers hold the pin in position to the stub and tap for 6-8 seconds the pin or untill the solder has covered the stub as well.

I had to do the above with a couple of eeproms a while back... since they were test roms they were in and out more often than a p0rn star on crack...

[DH]

Cracking explanation Zetr0

You're obviously experienced in fixing stuff like this, for me, I would mostly bin them and get new ones

I may have a question for you, I'll PM you it when I rediscover what it is

[rkauer]

Another hint is using a chip holder!

Simply put the offended chip on it, then solder the broken leg to the holder/carrier and at final solder the spare leg to broken chip.

Only doable on cases where the taller fix is not an issue for its own.

[Zetr0]

Originally Posted by rkauer

Another hint is using a chip holder!....

NICE!!!!!

I like that a solid 12 pence solution!

[whiteb]

This is a classic thread, can we see a pic of the chip ?

I'd like to see which pin is now in Silicon Heaven.

[mk1]

I don't have a camera but I'll see if I could get the chip scanned at work..

@Zetro & rkauer, thanks for the instructions although I doubt I'll be able to get my shaking hands to perform those operations. I did invest in a soldering iron now but I'm still missing everything else.

[DoogUK]

I found that using a dremel to carefuly grind away a bit of the ic's plastic over the top of the offending chip leg reveals enough of the shiny stuff to get a solder point for a wire.
This way the chip suffers no possible heat damage from the soldering iron.....but that too requires a steady hand.

[Jope]

Listen to DoogUK.

[frost242]

Like this one ?