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
Old 10-04-2021, 09:32 AM   #1
Canuckled
New Member
 
Join Date: Oct 2021
City & State: Peterborough, ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 6
Default Desoldering help

Hi. Iím new to soldering. Iím trying to remove a part from a board, so I can replace it with a new one, but I am having trouble trying to remove the old one. I have tried using flux with a de soldering braid, but it doesnít seem to want to remove all of it.

Any suggestions?

Canuckled is offline   Reply With Quote
Old 10-04-2021, 09:34 AM   #2
Canuckled
New Member
 
Join Date: Oct 2021
City & State: Peterborough, ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 6
Default Re: Desoldering help

I added a link for a picture, but I’m on mobile, so I hope it works.
Canuckled is offline   Reply With Quote
Old 10-04-2021, 11:50 AM   #3
clearchris
Badcaps Veteran
 
clearchris's Avatar
 
Join Date: Dec 2013
City & State: San Antonio
My Country: United States
Line Voltage: 120v 60hz / 240v 60hz
I'm a: Hardcore Geek
Posts: 606
Default Re: Desoldering help

IHMO, removing solder to remove a part can be the wrong strategy. You want to flood the part with solder so that your iron makes excellent contact with the puddle and the puddle transmits the heat into the board. I'll desolder joints to remove parts, but it's pretty easy with a heated desolder gun or even a desolder plunger pump. If I didn't have either, I'd use some PB solder to bring the melt point down a bit, keep it molten while I back the part out. Then I'd clean the solder out afterwards. Or sometimes, on a particularly stubborn board, I might keep the puddle melted and insert the new part through it. Kind of a pain, but sometimes you have to do what you have to do.

Of course, I'm assuming a two pin through hole device. I can't see any pics, so can't really give tailored advice.
clearchris is offline   Reply With Quote
Old 10-04-2021, 02:07 PM   #4
Canuckled
New Member
 
Join Date: Oct 2021
City & State: Peterborough, ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 6
Default Re: Desoldering help

Picture

I added a link to the picture on imgur.

I was going to try that, but like I said, I’m new to soldering. I have a great soldering gun, and all the other stuff that is needed. From the picture, it looks like I’m getting to the bare bones, but I just can’t get that last little bit.
Canuckled is offline   Reply With Quote
Old 10-04-2021, 02:17 PM   #5
petehall347
Badcaps Veteran
 
Join Date: Jan 2015
City & State: worcester
My Country: United Kingdom
I'm a: Knowledge Seeker
Posts: 3,280
Default Re: Desoldering help

that would remove easier with hot air . or maybe chipquik
petehall347 is offline   Reply With Quote
Old 10-04-2021, 02:44 PM   #6
diif
Badcaps Veteran
 
Join Date: Feb 2014
City & State: Midlands
My Country: England
I'm a: Professional Tech
Posts: 6,110
Default Re: Desoldering help

I'd use hot air to remove connectors, then braid to clean up the left over solder.
diif is offline   Reply With Quote
Old 10-04-2021, 03:05 PM   #7
Canuckled
New Member
 
Join Date: Oct 2021
City & State: Peterborough, ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 6
Default Re: Desoldering help

Ok, how would I do that? I have a hot air gun. Would I just put flux on the contact points, and heat it up?
Canuckled is offline   Reply With Quote
Old 10-04-2021, 03:29 PM   #8
diif
Badcaps Veteran
 
Join Date: Feb 2014
City & State: Midlands
My Country: England
I'm a: Professional Tech
Posts: 6,110
Default Re: Desoldering help

Depending on the connector I add leaded solder or low melt solder using an iron. Then I use hot air to remove the connector. I don't use flux when removing stuff.
diif is offline   Reply With Quote
Old 10-04-2021, 03:33 PM   #9
Canuckled
New Member
 
Join Date: Oct 2021
City & State: Peterborough, ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 6
Default Re: Desoldering help

Ok, thanks for the ideas. I’ll give it a try tomorrow and see how I make out. The stuff on the top has come off, but not the bottom stuff.
Canuckled is offline   Reply With Quote
Old 10-04-2021, 06:09 PM   #10
sam_sam_sam
Badcaps Veteran
 
Join Date: Jul 2011
City & State: Some times Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 3,656
Default Re: Desoldering help

Or if you have a soldering tweezers would also work but you would have to add some more solder to the mounting tabs and pins

Or remove the solder from the pins and add more solder to the tabs and remove the part when the solder has melted and is flowing

Which ever method you decide to do you will have to use more heat maybe as high as 800*F make sure your tweezers are up to temperature before you start

If you use a temperature controlled hot air gun turn up the heat and turn down the air flow but do not turn the air flow to low and do it from the back of the part too the edges of the board and keep moving around the part until it comes loose from the board
__________________
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *


These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board

All of these had CAPs POOF
All of the mosfet that are taken out by bad caps

Last edited by sam_sam_sam; 10-04-2021 at 06:16 PM..
sam_sam_sam is offline   Reply With Quote
Reply

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 - 2022
Powered by vBulletin ®
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 10:04 AM.
Did you find this forum helpful?