Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Equipment Usage, Soldering, Techniques, and Reviews
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 11-16-2022, 05:21 AM   #1
petemanuk
Member
 
Join Date: Feb 2022
City & State: Haverfordwest
My Country: Wales - United Kingdom
Line Voltage: 230v
I'm a: Knowledge Seeker
Posts: 26
Default BGA solder balls not connecting - help pls

So I though in my spare time I’d set myself up repairing motherboards mainly pin damaged lga1151 sockets types.

I’m using an achi ir sc pro rework station (gave up on my Achie ir6500 - don’t recommend)

I’ve managed to get my rework profile somewhere in the correct region (after a lot of trial and error) to get the old sockets off and reflow new ones back on again, the problems I’m getting is not all of the solder balls are re-attaching when re-flow occurs. I know this because when socket is removed pads still look clean and have no solder on them.

I'm also pre-baking the boards for several hours before refolwing them to avoid delamination.

Here’s what I’ve tried so far:

1. Made sure all the old solder is removed and pads are clean
2. Tried different makes of flux’s.
3. Tried different thickness of flux between the board and new socket.
4. Nudging the socket at reflow and you can see the surface tension pull it back into place.

I’m getting my new sockets for aliexpress and they are coming pre-balled with unleaded solder. I’ve had a look around the net and noticed some people using a stencil and adding more solder paste to the new pre-balled socket, has anyone had experience of this?

Also I’ve noticed that when I’ve been cleaning the motherboard bga pads that some of the are slightly sunken with the solder mask around them, I don’t think this is helping either.

Anyway enough rambling if any one could give me some tips/guidance it would be much appreciated

Last edited by petemanuk; 11-16-2022 at 05:31 AM..
petemanuk is offline   Reply With Quote
 

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2023
Powered by vBulletin ®
Copyright ©2000 - 2023, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 07:04 PM.
Did you find this forum helpful?