Soldering U2 chip (what tools needed) - GSM-Forum

Repnada · 05-30-2015, 22:13

Hello everyone,

I would like to start micro soldering, i have phone compagny but sometime we broke some chip during repair.

What is all tool needed for remove U2 chip and replace with new one ( i already have the new U2)

Can someone explain me how to desoldering and how to soldering back, which method is the best ?

Thanks

excessive · 05-30-2015, 22:33

Micro electronics works need looooots of experience. I suggest you to take some old pub and do many trials to find goodcways.

Anyway, you will work on bga so need to use either hot air or infrared technology.

diamond2010 · 05-31-2015, 10:55

Hello.. First of all you will need a Microscope. Second, a hot air station. Third a good pair of anti magnetic tweezers, flux and a loooooooooooot of patiance.

As excessive said i would recommend to start with an old pcb which you can throw into trash if your experiments fails. This Kind of soldering keeps a lot of surprises for you. Start with the smallest IC and then try bigger ones. You have to care a lot of for temperature, and air flow.

If there is black resin around the chip, remove that first.
Then try with at least 250-350 C to remove the chip.

Be aware of the black resin! Its most of the time underfilled with the IC. If you pull too early your board is damaged because of ripping of the little pads on the board.

Maybe i will post some pics of successful removing...

psytr0nic · 06-01-2015, 16:19

thread to follow !

leventc · 06-01-2015, 16:22

Here is the u2 ıc removal profesional tool
https://www.youtube.com/watch?v=oODpj71kxjA

jackie8 · 06-01-2015, 17:47

Do not solder u2 without practise. You will kill it 99%

dog68 · 06-11-2015, 02:33

Hot air, is wrong advise, you can remove, and replace u2 with iron

worldage · 06-11-2015, 02:41

to remove u2, put flux in top of it and soldering iron

wait till ics balls are melting and slowly push it with twiser to remove..

05-30-2015, 22:13	#1 (permalink)
Repnada Junior Member Join Date: May 2015 Posts: 32 Member: 2399894 Status: Offline Thanks Meter: 3	Soldering U2 chip (what tools needed) Hello everyone, I would like to start micro soldering, i have phone compagny but sometime we broke some chip during repair. What is all tool needed for remove U2 chip and replace with new one ( i already have the new U2) Can someone explain me how to desoldering and how to soldering back, which method is the best ? Thanks

05-30-2015, 22:33	#2 (permalink)
excessive No Life Poster Join Date: Mar 2005 Location: Italy, Bahrain, India Age: 53 Posts: 1,235 Member: 125037 Status: Offline Sonork: 100.1649338 Thanks Meter: 254	Micro electronics works need looooots of experience. I suggest you to take some old pub and do many trials to find goodcways. Anyway, you will work on bga so need to use either hot air or infrared technology. Last edited by excessive; 05-30-2015 at 23:01.

05-31-2015, 10:55	#3 (permalink)
diamond2010 Junior Member Join Date: Mar 2014 Posts: 20 Member: 2157594 Status: Offline Thanks Meter: 1	Hello.. First of all you will need a Microscope. Second, a hot air station. Third a good pair of anti magnetic tweezers, flux and a loooooooooooot of patiance. As excessive said i would recommend to start with an old pcb which you can throw into trash if your experiments fails. This Kind of soldering keeps a lot of surprises for you. Start with the smallest IC and then try bigger ones. You have to care a lot of for temperature, and air flow. If there is black resin around the chip, remove that first. Then try with at least 250-350 C to remove the chip. Be aware of the black resin! Its most of the time underfilled with the IC. If you pull too early your board is damaged because of ripping of the little pads on the board. Maybe i will post some pics of successful removing...

06-01-2015, 16:19	#4 (permalink)
psytr0nic No Life Poster Join Date: Oct 2010 Location: Abidjan Age: 38 Posts: 2,478 Member: 1418143 Status: Offline Thanks Meter: 353	thread to follow !

06-01-2015, 16:22	#5 (permalink)
leventc No Life Poster Join Date: Oct 2005 Posts: 1,589 Member: 194907 Status: Offline Thanks Meter: 114	Here is the u2 ıc removal profesional tool https://www.youtube.com/watch?v=oODpj71kxjA

06-01-2015, 17:47	#6 (permalink)
jackie8 Freak Poster Join Date: Jan 2014 Location: Germany Posts: 244 Member: 2105007 Status: Offline Thanks Meter: 40	Do not solder u2 without practise. You will kill it 99%

06-11-2015, 02:33	#7 (permalink)
dog68 No Life Poster Join Date: Mar 2012 Location: cambridgeshire, England Age: 55 Posts: 760 Member: 1728699 Status: Offline Thanks Meter: 212	Hot air, is wrong advise, you can remove, and replace u2 with iron

06-11-2015, 02:41	#8 (permalink)
worldage Crazy Poster Join Date: Feb 2008 Posts: 51 Member: 705789 Status: Offline Thanks Meter: 15	to remove u2, put flux in top of it and soldering iron wait till ics balls are melting and slowly push it with twiser to remove..