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A31p motherboard reflow

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manmanmanman
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A31p motherboard reflow

#1 Post by manmanmanman » Thu Jul 23, 2020 8:03 am

Just interested if anyone with a dead A31p motherboard tried to reflow it (since it seems that more often than not the GPU is at fault).

Im unfortunately the owner of 3 A31p's, all with the same motherboard issue. :roll:
X60 | X200s | X230t | T42p | A31p with numpad | i1400 | T40, T41, T42 | A31

kfzhu1229
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Re: A31p motherboard reflow

#2 Post by kfzhu1229 » Thu Jul 23, 2020 8:46 am

I've reflowed a t42 motherboard for the same gpu problem (in fact, similar chip to the A31) with toaster oven and a A30 motherboard also with the same problem with heat gun.
I would go for toaster oven because its so much easier to control the temps. The heat gun doesn't require you to strip everything off the motherboard like plastic insulation stickers.
The T42 lived and the A30 died
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manmanmanman
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Re: A31p motherboard reflow

#3 Post by manmanmanman » Thu Jul 23, 2020 9:04 am

kfzhu1229 wrote:
Thu Jul 23, 2020 8:46 am
I've reflowed a t42 motherboard for the same gpu problem (in fact, similar chip to the A31) with toaster oven and a A30 motherboard also with the same problem with heat gun.
I would go for toaster oven because its so much easier to control the temps. The heat gun doesn't require you to strip everything off the motherboard like plastic insulation stickers.
The T42 lived and the A30 died
Mind me asking what temperature you used?
X60 | X200s | X230t | T42p | A31p with numpad | i1400 | T40, T41, T42 | A31

kfzhu1229
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Re: A31p motherboard reflow

#4 Post by kfzhu1229 » Thu Jul 23, 2020 2:02 pm

manmanmanman wrote:
Thu Jul 23, 2020 9:04 am
kfzhu1229 wrote:
Thu Jul 23, 2020 8:46 am
I've reflowed a t42 motherboard for the same gpu problem (in fact, similar chip to the A31) with toaster oven and a A30 motherboard also with the same problem with heat gun.
I would go for toaster oven because its so much easier to control the temps. The heat gun doesn't require you to strip everything off the motherboard like plastic insulation stickers.
The T42 lived and the A30 died
Mind me asking what temperature you used?
I use 385F for the likes of these older ones with lead solder, and 370F for the newer ones like T4x and later which uses lead free solder.
Put it in oven for like 8-10 minutes after preheat, then slowly open the door every 5 minutes or so until the door opens fully, then leave it as is for another half an hour.
Remove all the black plastic films before this and tapes too.
Good luck.
Dell Lat CP MMX-233 64mb 40gb W2k
600 PII-266 416mb 40gb WXP
T23 PIII 1.13ghz 1gb W7
Precision M4300 X9000 8gb 160gb WUXGA Ultrasharp fp W10
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theterminator93
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Re: A31p motherboard reflow

#5 Post by theterminator93 » Thu Jul 23, 2020 2:41 pm

I tried with a heat gun on an A31p which was intermittently having issues, and ended up killing it completely. Clearly not my field of expertise! :lol:
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kfzhu1229
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Re: A31p motherboard reflow

#6 Post by kfzhu1229 » Thu Jul 23, 2020 2:45 pm

theterminator93 wrote:
Thu Jul 23, 2020 2:41 pm
I tried with a heat gun on an A31p which was intermittently having issues, and ended up killing it completely. Clearly not my field of expertise! :lol:
Well this is really why I ended up using oven methods as that is much easier for newbies to control.
Dell Lat CP MMX-233 64mb 40gb W2k
600 PII-266 416mb 40gb WXP
T23 PIII 1.13ghz 1gb W7
Precision M4300 X9000 8gb 160gb WUXGA Ultrasharp fp W10
T530i 15.6" i7 16gb fp W10
UXGA:
A30p PIII 1.2 1gb W7 (IDTech)
T43p 2.26 2gb fp W10 (Sharp)
Lat C840 P4-2.5 2gb 60gb W7 (Ultrasharp)

RealBlackStuff
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Re: A31p motherboard reflow

#7 Post by RealBlackStuff » Fri Jul 24, 2020 12:22 am

kfzhu1229 wrote:I use 385F for the likes of these older ones with lead solder, and 370F for the newer ones like T4x and later which uses lead free solder.
Actually the "old" solder with lead needs a lot less less heat than lead-free solder!
So I don't quite follow your logic.
Those figures should be the other way around, and rather with more different temperatures!
Like ~360F for lead solder and ~420F for lead-free solder.
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manmanmanman
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Re: A31p motherboard reflow

#8 Post by manmanmanman » Mon Jul 27, 2020 9:47 am

I'll try and get my hands on some sort of toaster or throwaway oven and update the thread once I try it, thanks!
X60 | X200s | X230t | T42p | A31p with numpad | i1400 | T40, T41, T42 | A31

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Re: A31p motherboard reflow

#9 Post by kfzhu1229 » Mon Jul 27, 2020 1:54 pm

RealBlackStuff wrote:
Fri Jul 24, 2020 12:22 am
Actually the "old" solder with lead needs a lot less less heat than lead-free solder!
So I don't quite follow your logic.
Those figures should be the other way around, and rather with more different temperatures!
Like ~360F for lead solder and ~420F for lead-free solder.
Oops alright then. I just followed from some YouTubers that were just casually doing it and they don't quite know the exact temperatures either.
But I do know that 385F worked for both the T42 GPU and the Latitude CPx RAM slot.
If the lead free solder has a higher melting point why does it have more problems with thermal cycling and cracking? Or was it just flawed lead free soldering techniques back then?
Dell Lat CP MMX-233 64mb 40gb W2k
600 PII-266 416mb 40gb WXP
T23 PIII 1.13ghz 1gb W7
Precision M4300 X9000 8gb 160gb WUXGA Ultrasharp fp W10
T530i 15.6" i7 16gb fp W10
UXGA:
A30p PIII 1.2 1gb W7 (IDTech)
T43p 2.26 2gb fp W10 (Sharp)
Lat C840 P4-2.5 2gb 60gb W7 (Ultrasharp)

RealBlackStuff
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Re: A31p motherboard reflow

#10 Post by RealBlackStuff » Tue Jul 28, 2020 12:00 am

In the T4x days they didn't know (yet, if ever) what they were doing.
The 'working' temperatures in those early RoHS days were not high enough for the new lead-free solder to properly melt and thus, properly attach.
It probably looked OK, but was anything but!
Still NOT a great day for a Guinness! (the Real Black Stuff).
Ireland's lockdown reduced to Level 3 [do not leave your own County] till January 2021!
Covid-19: Mask it or Casket!
Check out The Boardroom for Mods and Other Services.

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