Löt- und Modifikationsgewinde

[Sparksnl]

Hi all, I thought of starting a thread about pin replacement of processors. I have an AMD FX-55 with one missing pin. It is one of the VDDA pins.
But then again that might have been to limited so I thought of making this a thread that can give more info then just pin replacement.
This way people have a chance to read more about soldering and fixes which is specific for old pc hardware.

That being said I would still like to have some tips about pin replacement…



I have several cpu’s I can take pins from and dead cpu’s as well where I can test it on. I just miss the input on how it works. Can anyone help me out?

ps. Since my German writing skills are limited this is in English. The rest of you probably do better…

 

[Masterchief79]

You're lucky that pin is on the outside row. Get the smallest soldering tip you can, ideally work with a magnifying lamp or something similar, and just go for it. Getting the rest of that pin off is the first step.
Soldering Flux always helps too but I'm not sure how you would clean it off between the other pins.

Then just get a spare pin and some tweezers and whack that mf on there. If there's too much solder, you can always try again, use solder wick or maybe a desoldering pump. And yeah, trying that a few times on some dead CPUs would be the way to go.

In theory, it's not that complicated. In my mind, it's a question of steady hands and craftsmanship. ^^

Other than that, if there are more VDDA pins and they are connected in parrallel, this particular pin might not be necessary to repair at all.

 

[Ben Psyko]

My plan was to use a Push Pencil tip in a drillpress to hold the Pin straight and perfectly alignet when soldering.

But time to test this is my enemy 🙄

 

[bschicht86]

Bilder sagen mehr als tausend Worte



Funktioniert gut, wenn die Pins am Rand sind. In 2.ter Reihe wird der Pin davor noch ausgelötet. Fürs Mittendrin müsste ich wohl mal mit Heißluft experimentieren, wobei ich damit (zu heiß gedreht) auch schon CPU's gekillt habe.

Soldering Flux always helps too but I'm not sure how you would clean it off between the other pins.

Mit einem Pinsel.

 

[Masterchief79]

Heh, cooles Spezialwerkzeug

 

[Sparksnl]

You're lucky that pin is on the outside row. Get the smallest soldering tip you can, ideally work with a magnifying lamp or something similar, and just go for it. Getting the rest of that pin off is the first step.
Soldering Flux always helps too but I'm not sure how you would clean it off between the other pins.

Then just get a spare pin and some tweezers and whack that mf on there. If there's too much solder, you can always try again, use solder wick or maybe a desoldering pump. And yeah, trying that a few times on some dead CPUs would be the way to go.

In theory, it's not that complicated. In my mind, it's a question of steady hands and craftsmanship. ^^

Other than that, if there are more VDDA pins and they are connected in parrallel, this particular pin might not be necessary to repair at all.

Yes I am indeed lucky it is on the outside. I am still in doubt if I will take the effort of fixing it. It always is a risk.
I have the proper tools and tips. 1 magnifying glass, +3 glasses, Weller WSP 80, WP-120 and WTA-50 tweezers. Even hot air if needed. Besides that, I have a steady hand. One of the best actually. It is experience I mis for this.
I do wonder which solder would be best for this. I have thin solder with flux in it.

Bilder sagen mehr als tausend Worte

Anhang anzeigen 931264Anhang anzeigen 931265Anhang anzeigen 931266

Funktioniert gut, wenn die Pins am Rand sind. In 2.ter Reihe wird der Pin davor noch ausgelötet. Fürs Mittendrin müsste ich wohl mal mit Heißluft experimentieren, wobei ich damit (zu heiß gedreht) auch schon CPU's gekillt habe.


Mit einem Pinsel.

That looks cool. You use this for placing the pin on it? Holding it?

 

[bschicht86]

That looks cool. You use this for placing the pin on it? Holding it?

Ja.

Die Spitze ist auch abgefeilt, aber nur soweit, dass noch eine kleine seitiche Öffnung über ist. Dort halte ich die Lötspitze dran.

 

[Sparksnl]

That is still precision work then