I can't how replacing small BGA chips - GSM-Forum

areax · 05-27-2017, 08:10

Hello,
I'm a person who wants to do that and in his life has done many types of work, lately I'm dealing with mobile repair, but I'm still in the early stages. Although I have now reached a fair level in tin soldering, I can not work in replacing small BGA chips.

I'll explain. Not being able to experiment on other phones, I have old running phones (such as Nokia 3200, 3210, etc.), which disagree with the power chips and reset them. The practice I apply is what you generally see on youtube. Now it seems that the desoldering / welding works well, but when I go back to it, it is still dead. Since I am a beginner I would like to know where I am wrong. Maybe I use a hot air station temperature too high? I'm here to learn. Thank you
excuse my english

i'am italian

fulviospano · 05-29-2017, 21:15

At what temperature do you work?

areax · 06-06-2017, 17:39

Quote:

Originally Posted by fulviospano

At what temperature do you work?

I put the station at 400° C and put the gun at 3-4 centimeters...

orx · 06-06-2017, 21:08

hi
400 degree is a very excessive temperature for soldering and desoldering ..step by step explain what do you mean small ic or make an example of what would do and your procedure for soldering...

attention the argument is very large..

areax · 06-07-2017, 15:57

Example. How would you replace a power chip on a samsung note 3 motherboard? I put a little bit of flux and start heating up setting what temperature? The IC in question is the PMA8084. How would you do that? Can I use a Fluke 62 MAX infrared thermometer to measure the temperature or just a k probe?

orx · 06-07-2017, 16:56

first , always ceck always for any boards in rework, what's on the other side of the board and if necessary tries to cool the critical components (very important)
second , yes you can to use k probe at the first experience you build an idea ..
Isolates all components around with kapton tape leaving only the PMIC visible
for replace pmic i use for remove ic , flux amtech nc559 or others ,330 /340 degree hot air (depends on your station .. on my station will be lower..) full air .

Be careful when removing ic , try to be sure shakes it that it is completely unsoldered , if you have not right attention risk of snatching some important prints.

clean well the prints on board (carefully) using solder iron and finally then you must to procede at the alignment OF NEW IC ..
For this i can only tell you that this last phase requires attempts, attempts to accumulate the right sensibility .
What I wrote is how I would do it and how I do it, listen to other opinions.

good luck

05-27-2017, 08:10	#1 (permalink)
areax Junior Member Join Date: Mar 2017 Location: Italy Posts: 4 Member: 2696123 Status: Offline Thanks Meter: 0	I can't how replacing small BGA chips Hello, I'm a person who wants to do that and in his life has done many types of work, lately I'm dealing with mobile repair, but I'm still in the early stages. Although I have now reached a fair level in tin soldering, I can not work in replacing small BGA chips. I'll explain. Not being able to experiment on other phones, I have old running phones (such as Nokia 3200, 3210, etc.), which disagree with the power chips and reset them. The practice I apply is what you generally see on youtube. Now it seems that the desoldering / welding works well, but when I go back to it, it is still dead. Since I am a beginner I would like to know where I am wrong. Maybe I use a hot air station temperature too high? I'm here to learn. Thank you excuse my english i'am italian

05-29-2017, 21:15	#2 (permalink)
fulviospano Freak Poster Join Date: Aug 2005 Location: Italy Age: 49 Posts: 121 Member: 168904 Status: Offline Thanks Meter: 23	At what temperature do you work? Last edited by orx; 05-29-2017 at 21:38.

06-06-2017, 21:08	#4 (permalink)
orx No Life Poster Join Date: Oct 2012 Location: Republic of Serenissima Posts: 1,516 Member: 1825965 Status: Offline Thanks Meter: 874	hi 400 degree is a very excessive temperature for soldering and desoldering ..step by step explain what do you mean small ic or make an example of what would do and your procedure for soldering... attention the argument is very large.. Last edited by orx; 06-06-2017 at 23:19.

06-07-2017, 16:56	#6 (permalink)
orx No Life Poster Join Date: Oct 2012 Location: Republic of Serenissima Posts: 1,516 Member: 1825965 Status: Offline Thanks Meter: 874	first , always ceck always for any boards in rework, what's on the other side of the board and if necessary tries to cool the critical components (very important) second , yes you can to use k probe at the first experience you build an idea .. Isolates all components around with kapton tape leaving only the PMIC visible for replace pmic i use for remove ic , flux amtech nc559 or others ,330 /340 degree hot air (depends on your station .. on my station will be lower..) full air . Be careful when removing ic , try to be sure shakes it that it is completely unsoldered , if you have not right attention risk of snatching some important prints. clean well the prints on board (carefully) using solder iron and finally then you must to procede at the alignment OF NEW IC .. For this i can only tell you that this last phase requires attempts, attempts to accumulate the right sensibility . What I wrote is how I would do it and how I do it, listen to other opinions. good luck Last edited by orx; 06-07-2017 at 17:01.

06-07-2017, 15:57	#5 (permalink)
areax Junior Member Join Date: Mar 2017 Location: Italy Posts: 4 Member: 2696123 Status: Offline Thanks Meter: 0	Example. How would you replace a power chip on a samsung note 3 motherboard? I put a little bit of flux and start heating up setting what temperature? The IC in question is the PMA8084. How would you do that? Can I use a Fluke 62 MAX infrared thermometer to measure the temperature or just a k probe?