Reflowing question? - GSM-Forum

Fasterbaby · 03-05-2003, 10:41

Hi
I have just bought a SMD work station and intend to try to repair loss of signal etc, what i would like to know is what parts to reflow? I dont want to kill any phones

also are there any sites with details on replacing cobbas etc. I have removed some chips from an old board and it looks very difficult to replace them. Thanks

Rhamses · 03-05-2003, 15:43

Like first you should measure the temperature and the air flow.Try with measring the temperature of the air at 1cm from the tip.You shuldn`t put the tem. higher than 270Celsius(this is the most important thing).Beware that your station doesn`t increase the temperature or you will burn the PCB or parts on it!!!!Second-it is very important to use the right flux for reflowing!!!!Don`t use anything from China!!!Use German or Japanese BGA flux!My sugestion is to use Senyometals from Japan or Alphametals from Germany.Third- if you reball the BGA parts use Japanese BGA soldering paste,too.
This is the very begining,else is up to you!Have on mind that if your station is bad-all above is useless!!!!!!!
Have a nice day!!

Fasterbaby · 03-05-2003, 19:00

When you are reflowing the components how long do you normally heat each chip? Or do you use a wide attachment and do a large area at once? Sorry to sound dumb but i am just trying to learn

willy · 03-05-2003, 19:22

let we say ... when chip is good solder ?

for me, i know, with flux, that tin be come bright , it mean, "good" already !

you can try this ,, eg, you going to install CCONT chip !
but when is it "good solder" ?

it is easy

like 8210 CCONT,, beside CCONT, there is many capacitor, C150, C151, C152......... you start to heat that CCONT, and try to bit to move C151,, if C151 can move , then it mean around CCONT all "GOOD" already !

Willy

Fasterbaby · 03-05-2003, 19:39

Thanks i will try that

no doubt i will kill many phones.. i am just attempting reflowing at the moment, i don't think i could attemrt to replace a new chip yet.

ARS · 03-05-2003, 19:46

btw reflowing BGA chip is in most cases just a temporely solution, better is to reball them. You are new in hw...so take a cheap working phone like nokia 3210, and try to take out, reball and place cobba or ccont...is better to learn on your own phone as destroy someone phone...

Fasterbaby · 03-05-2003, 19:54

Yes i will use my own phone of course. I really need to know more about reballing, where can i get the info from? If you have any links could you please mail me

[email protected]

Farmer.PT · 03-19-2003, 17:55

Hi, where can i buy alphametals or senyometals products ?

Best regards.

Rhamses · 03-24-2003, 12:26

About Alphametals flux-there is a factory in Germany and one in Endland,but,frankly I don`t know were

I have a guy that brings all that stuff from Germany on a low price and,cause of that, I don`t care where he buys it!!!
I`m sure that they have a Web page.
And,my mistake,it`s SENU metals,not SENYO,my mistake!!!!
Pal,you`re a long way from me othrewise I woluld introduce with my supplier!!!

Rhamses · 03-24-2003, 12:28

Another mistake- it`s SENJU metals!!!!!!!!!!!!
Those Japanese!!!!

johny3310 · 03-25-2003, 11:57

Quote:

Originally posted by Fasterbaby
Yes i will use my own phone of course. I really need to know more about reballing, where can i get the info from? If you have any links could you please mail me

Give add in your local adds newspaper and say that you buy broken phones. People oftem sell broken phones very cheap.
Try to find i.e. 3310 with no signal, so you can practice on
reballing chaps, cobba, ccont, flash....
Other peoples trash, yours treasure!

03-05-2003, 10:41	#1 (permalink)
Fasterbaby Insane Poster Join Date: Feb 2003 Posts: 83 Member: 21387 Status: Offline Thanks Meter: 0	Reflowing question? Hi I have just bought a SMD work station and intend to try to repair loss of signal etc, what i would like to know is what parts to reflow? I dont want to kill any phones also are there any sites with details on replacing cobbas etc. I have removed some chips from an old board and it looks very difficult to replace them. Thanks

03-24-2003, 12:26	#9 (permalink)
Rhamses Freak Poster Join Date: Mar 2003 Location: MNE Age: 43 Posts: 226 Member: 23848 Status: Offline Thanks Meter: 13	About Alphametals flux-there is a factory in Germany and one in Endland,but,frankly I don`t know wereI have a guy that brings all that stuff from Germany on a low price and,cause of that, I don`t care where he buys it!!! I`m sure that they have a Web page. And,my mistake,it`s SENU metals,not SENYO,my mistake!!!! Pal,you`re a long way from me othrewise I woluld introduce with my supplier!!!

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03-05-2003, 15:43	#2 (permalink)
Rhamses Freak Poster Join Date: Mar 2003 Location: MNE Age: 43 Posts: 226 Member: 23848 Status: Offline Thanks Meter: 13	Like first you should measure the temperature and the air flow.Try with measring the temperature of the air at 1cm from the tip.You shuldn`t put the tem. higher than 270Celsius(this is the most important thing).Beware that your station doesn`t increase the temperature or you will burn the PCB or parts on it!!!!Second-it is very important to use the right flux for reflowing!!!!Don`t use anything from China!!!Use German or Japanese BGA flux!My sugestion is to use Senyometals from Japan or Alphametals from Germany.Third- if you reball the BGA parts use Japanese BGA soldering paste,too. This is the very begining,else is up to you!Have on mind that if your station is bad-all above is useless!!!!!!! Have a nice day!!

03-05-2003, 19:00	#3 (permalink)
Fasterbaby Insane Poster Join Date: Feb 2003 Posts: 83 Member: 21387 Status: Offline Thanks Meter: 0	When you are reflowing the components how long do you normally heat each chip? Or do you use a wide attachment and do a large area at once? Sorry to sound dumb but i am just trying to learn

03-05-2003, 19:22	#4 (permalink)
willy No Life Poster Join Date: Mar 2000 Location: inside NOKIA phone Age: 58 Posts: 1,677 Member: 1060 Status: Offline Thanks Meter: 10	let we say ... when chip is good solder ? for me, i know, with flux, that tin be come bright , it mean, "good" already ! you can try this ,, eg, you going to install CCONT chip ! but when is it "good solder" ? it is easy like 8210 CCONT,, beside CCONT, there is many capacitor, C150, C151, C152......... you start to heat that CCONT, and try to bit to move C151,, if C151 can move , then it mean around CCONT all "GOOD" already ! Willy

03-05-2003, 19:39	#5 (permalink)
Fasterbaby Insane Poster Join Date: Feb 2003 Posts: 83 Member: 21387 Status: Offline Thanks Meter: 0	Thanks i will try that no doubt i will kill many phones.. i am just attempting reflowing at the moment, i don't think i could attemrt to replace a new chip yet.

03-05-2003, 19:46	#6 (permalink)
ARS No Life Poster Join Date: Dec 2000 Location: Slovakia, Brezno Posts: 980 Member: 2721 Status: Offline Thanks Meter: 23	btw reflowing BGA chip is in most cases just a temporely solution, better is to reball them. You are new in hw...so take a cheap working phone like nokia 3210, and try to take out, reball and place cobba or ccont...is better to learn on your own phone as destroy someone phone...

03-05-2003, 19:54	#7 (permalink)
Fasterbaby Insane Poster Join Date: Feb 2003 Posts: 83 Member: 21387 Status: Offline Thanks Meter: 0	Yes i will use my own phone of course. I really need to know more about reballing, where can i get the info from? If you have any links could you please mail me [email protected]

03-19-2003, 17:55	#8 (permalink)
Farmer.PT Freak Poster Join Date: Jul 2000 Location: Portugal Age: 46 Posts: 103 Member: 1758 Status: Offline Thanks Meter: 1	Hi, where can i buy alphametals or senyometals products ? Best regards.

03-24-2003, 12:28	#10 (permalink)
Rhamses Freak Poster Join Date: Mar 2003 Location: MNE Age: 43 Posts: 226 Member: 23848 Status: Offline Thanks Meter: 13	Another mistake- it`s SENJU metals!!!!!!!!!!!! Those Japanese!!!!