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Electronics Repair - Soldering

 
Anonymous Coward
User ID: 75953087
United States
04/06/2018 05:27 PM
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Re: Electronics Repair - Soldering
Sometimes I watch Louis Rossmann repair macbooks.

Its just relaxing.



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Anonymous Coward
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04/06/2018 05:50 PM
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Re: Electronics Repair - Soldering
Ball Grid arrays, remember those?
anonymous coward
User ID: 76076258
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04/07/2018 04:35 PM
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Re: Electronics Repair - Soldering
When those solder balls get rotten, you can't pick very much cotton.........
Anonymous Coward
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04/07/2018 04:42 PM
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Re: Electronics Repair - Soldering
thru hole soldering is usually done from backside with solder sucker or wick to clear hole and top side solder on pin. Flux should pull solder through hole when resoldering in new IC. hf
Anonymous Coward
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04/07/2018 04:56 PM
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Re: Electronics Repair - Soldering
For an IC use a socket to prevent heat damage.

Spring loaded solder sucker and flu will help, then clean up with rubbing alcohol and a brush.
Anonymous Coward
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04/07/2018 04:58 PM
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Re: Electronics Repair - Soldering
[link to www.digikey.com (secure)]

Some sockets
Anonymous Coward
User ID: 70975244
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04/07/2018 04:59 PM
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Re: Electronics Repair - Soldering
I wish I had a better soldering gun
anonymous coward
User ID: 76076258
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04/07/2018 05:03 PM
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Re: Electronics Repair - Soldering
Anybody got one of these newbies??

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Anonymous Coward
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04/07/2018 05:05 PM
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Re: Electronics Repair - Soldering
Make sure each hole is clean. Heat a hole up until it melts then take a straw right up there next to it and blow a shot of air , it will blow the solder out of the hole. make sure the solder doesnt fall down below and bridge a circuit somewhere.

Install I.C. careful of orientation.

They look like plated through-hole boards, so you might get by just soldering one side, just look at the holes to see if they really are plated all the way though.
lightchild_uk
Waiting for IT

User ID: 72429277
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04/07/2018 06:49 PM

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Re: Electronics Repair - Soldering
In the future, the best way to remove a chip is to.

Cut the legs off the chip from the topside,
then de-solder each leg in turn.

As the previous poster suggested solder a socket in and then put the new chip into the socket.

Make sure you use solder with lead in.



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Last Edited by lightchild_uk on 04/07/2018 06:50 PM
Anonymous Coward
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04/07/2018 07:46 PM
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Re: Electronics Repair - Soldering
In the future, the best way to remove a chip is to.

Cut the legs off the chip from the topside,
then de-solder each leg in turn.

As the previous poster suggested solder a socket in and then put the new chip into the socket.

Make sure you use solder with lead in.



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 Quoting: lightchild_uk

Actually that is incorrect. Might work on low voltage digital ICs but hi freq components used in cellular and radar electronics this is the last thing you want to do. The shock from clipping leads introduces micro fractures on lan pads and thru holes which drastically changes the impedance of a RF circuit. Best to desolder using an ESD soldering station and if that doesn't work, you reflow. Last option is to clip leads. hf
bitofreason
User ID: 72207572
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04/07/2018 11:51 PM
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Re: Electronics Repair - Soldering
Sometimes I watch Louis Rossmann repair macbooks.

Its just relaxing.



[link to www.youtube.com (secure)]
 Quoting: Anonymous Coward 75953087


Louis is the man, learned a lot from him. And OP, just flux it good both sides, tin the pads on the top, place the chips and solder heavy from the bottom. If needed grab a heatgun and shield the rest with foil, cut a hole just the size of the chip out and blow that sucker.
Anonymous Coward
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04/07/2018 11:52 PM
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Re: Electronics Repair - Soldering
make sure to get a good whiff of the smoke too

:tomrelief:
Anonymous Coward
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04/07/2018 11:56 PM
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Re: Electronics Repair - Soldering
Any electronics repair people in the house? I am making my first real attempt at doing some electronics repair and know just enough about it to be dangerous. I have done some minor things like this, but not at this level.

I am trying to replace an IC that goes through the board. The problem is there is not enough room to get the solder in there and the soldering iron without burning everything else in proximity. Soldering it from the backside is a little more doable, the front side is the problem. There are traces that need a contact and I simply cannot get in there to do it. Without of course burning everything else or having the solder bridge two or more prongs of the IC.

Looking for tips and advice for this sort of work. Or am I going about it entirely the wrong way?
 Quoting: BrokenTech


IC's are rarely soldered on the package side, but through the other side of the circuit board. If you have through holes in the circuit board eg. multi-lawyer circuit board then the solder will flow into the channel and all connections to that pin will be made. The only time you need to solder a pin on the package (component) side, is when you have a two sided circuit board but do not have either multi-layer board or through hole plating. That case you need to solder that pin to the trace going to it to ensure circuit is complete. It can be tricky to do this but it is rarely needed to be done.
Anonymous Coward
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04/08/2018 12:09 AM
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Re: Electronics Repair - Soldering
Specifically, I am trying to put a TL594CN IC back on the board. The old one is out, but getting solder on the top so that it contacts the traces is the problem. There are traces on both sides, the backside is doable but still a little hard to work with.

Here is what I am working with.

[link to photobucket.com]
 Quoting: BrokenTech


I made another post you can look at it.

I was an electronics tech for 10 years board level repair.

here are my tips:

if you are worried that traces on top or bottom won't be connected. you can do a continuity test on them. Just follow a trace on component side of board going to a chip pin (assume chip is out of board), go to underside of board to same pin hole but underneath and with your ohm meter check for zero resistance. Do this for each trace going to a pin on the component side of the IC with the corresponding pad on the underside of the board. If all are zeroed out then you have a plated though hole board and or a multi-level circuit board. In this case you just solder as per normal on the underside of the circuit board when you insert IC replacement and you are good to go. If any of the top traces going to an IC pin and corresponding bottom pad of that same pin do not zero out - you have to solder both top and bottom of that pin on the IC. I think another poster mentioned that sometimes to do this you need to run a fine lead wire to the pin on top and to a relevant contact point on the board if you cannot get your soldering iron tip to the pin.

Use a 40 watt iron as low powered irons are useless if you want good connection apply small amount of flux direct to the pin on top - very small. Despite what many believe IC's are fairly resistant to heat but don't lay your iron on the IC's pins for 30 minutes etc.
Anonymous Coward
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United Kingdom
04/08/2018 12:43 AM
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Re: Electronics Repair - Soldering
You need a SMD hot air gun. Basically it heats the solder joints up allowsyou to pull the chip off. Then you just heat up the solder again and push the chip in while the solder is still hot.
 Quoting: Anonymous Coward 53017384


I've got the old chip out, getting the new one in place is my challenge.
 Quoting: BrokenTech


I've never seen a board that did not carry the copper through the holes to the other side, you always just solder the IC from the back until it is a clean solder and you are done. You do not solder the top unless you have some really weird PCB board it isn't neccessarry. once soldered do a continuity test from back of board solder to corresponding top trace and if there is continuity you are done.





GLP