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Neon_WA
Joined: 08 Nov 2008
Posts: 6467
Location: Perth, West Australia
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 Posted: Thu Feb 02, 2012 7:43 pm Post subject: GB question |
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Seeing CPUShack isnt around at the moment.. trying to work out best way to approach this
If there was some special chips soldered onto a board what would you prefer to do
guessing boards are between 1 - 2 lb
A) get whole board shipped from the US
B) pay to have them shipped within US to someone who can desolder them, then ship to you
C) wait till CPUShack gets back, then ship boards to him to desolder.. and ship with your avicc items
D) some thing i havent thought of
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smithy
Joined: 27 Apr 2008
Posts: 2177
Location: Sydney, Australia
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| Posted: Thu Feb 02, 2012 7:45 pm Post subject: |
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A) or....
D) get them shipped to you to desolder, then you can ship the chip to me |
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Robev
Joined: 10 Mar 2006
Posts: 1603
Location: New Zealand
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| Posted: Thu Feb 02, 2012 8:28 pm Post subject: |
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 Naaaaaaaaa
Just Ship them to me I will desolder the Chips n send you the boards 
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Neon_WA
Joined: 08 Nov 2008
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Location: Perth, West Australia
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| Posted: Thu Feb 02, 2012 8:37 pm Post subject: |
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| smithy wrote: | | D) get them shipped to you to desolder |
You need the practice 
| Robev wrote: | | Just Ship them to me I will desolder the Chips n send you the boards |
Get back to work sorting those Pentiums
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Robev
Joined: 10 Mar 2006
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Location: New Zealand
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| Posted: Thu Feb 02, 2012 8:40 pm Post subject: |
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| Neon_WA wrote: | | Get back to work sorting those Pentiums |
aye aye Capn
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Neon_WA
Joined: 08 Nov 2008
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Location: Perth, West Australia
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| Posted: Thu Feb 02, 2012 10:01 pm Post subject: |
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| smithy wrote: | | D) get them shipped to you to desolder, then you can ship the chip to me |
As these are coated boards.. I find removing the coating off the chips before desoldering them gives better results
but does take some more work
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johnorun
Joined: 04 Apr 2008
Posts: 2679
Location: Chicago, IL- US
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| Posted: Fri Feb 03, 2012 12:31 am Post subject: |
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I have desoldered several boards from Group buys in the past and I'd consider volunteering if I had more details of the parts to be de-soldered. 
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Neon_WA
Joined: 08 Nov 2008
Posts: 6467
Location: Perth, West Australia
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| Posted: Sun Feb 05, 2012 10:24 pm Post subject: |
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| johnorun wrote: | | I'd consider volunteering if I had more details of the parts to be de-soldered. |
happy to say now.. will be mil spec 80C196 & 80C186 boards
got a few more coming.. so will post when the rest arrive
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gshv
Joined: 01 Feb 2003
Posts: 7037
Location: Fairfax, VA USA
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| Posted: Mon Feb 06, 2012 12:59 am Post subject: |
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How difficult is to desolder those with proper tools?
Gennadiy |
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Neon_WA
Joined: 08 Nov 2008
Posts: 6467
Location: Perth, West Australia
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| Posted: Mon Feb 06, 2012 1:09 am Post subject: |
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| gshv wrote: | How difficult is to desolder those with proper tools?
Gennadiy |
for best results on PGA chips.. small blow torch the best, rather than heat gun
I generally heat up.. then tap excess solder out
then repeat till no more solder comes loose
the tricky part is making a tool to pull the chip out straight and that wont damage the ceramic
These have a added complication of being coated boards & chips
Some of these boards do have the extra chip.. so something to practice on
If people wanted to try this at home.. I was going to write out a step by step procedure
and things to watch out for
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There are 10 types of people in this world:
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Last edited by Neon_WA on Mon Feb 06, 2012 1:15 am; edited 1 time in total |
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gshv
Joined: 01 Feb 2003
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Location: Fairfax, VA USA
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| Posted: Mon Feb 06, 2012 1:15 am Post subject: |
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I should have a blow torch somewhere. I'll practice on the second chip.
Gennadiy |
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Neon_WA
Joined: 08 Nov 2008
Posts: 6467
Location: Perth, West Australia
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| Posted: Mon Feb 06, 2012 1:17 am Post subject: |
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| gshv wrote: | I should have a blow torch somewhere. I'll practice on the second chip.
Gennadiy |
just get solder so it just molten
also.. you will have to apply torch from underneath, other wise solder can run up pins towards the ceramic
the reason for tapping solder out first, is that when you do go to pull chip out..
you dont end up with solder daggs hanging off the pins (lot harder to remove once chip is pulled)
depends on how of a perfectionist you are in how you want the pins to look
I'm at one end of the scale.. and CPUShack is at the other end
using a small blow torch, things do get hotter quicker so keep the flame moving
if any caps near where you are applying the heat.. then wear glasses just in case one goes off
as for tool to remove the chip.. I use tongs like the 3rd & 4th set across
The 3rd is for smaller or easy ones.. the 4th is great for PGA with 200+ pins
They have a wide grip and I have bent some differently depending on what size chip I am pulling
and I replace the insulating fabric with some thin cork sheeting
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Neon_WA
Joined: 08 Nov 2008
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Location: Perth, West Australia
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| Posted: Tue Feb 07, 2012 7:27 pm Post subject: |
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the other boards should arrive on the 9th
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susl45
Joined: 27 Dec 2007
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Location: CHU
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Neon_WA
Joined: 08 Nov 2008
Posts: 6467
Location: Perth, West Australia
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| Posted: Tue Feb 07, 2012 7:47 pm Post subject: |
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if I can make a tool to make the job easier & quicker.. I do
having a full workshop here at work does make it easier to manufacture an array of tools
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