how to reflow laptop graphic chip

[saqi80]

Hi Everyone,
i am new to this forum, will try my best not to bother u ppl.
Basically i want to know how to reflow graphic chip of laptop, i have got hot air, can anyone tell me what temprature shud be, how long shud i keep it on graphic chip, what shud be distance b/w chip and hot air and other necessarily things?
sorry for bad english
thanks

[shovenose]

Re: how to reflow laptop graphic chip

you could just put it in the oven for like 10mins.
heat guns are good at frying other components.

[PCBONEZ]

Re: how to reflow laptop graphic chip

Ovens are better than heat guns for frying other components because they heat EVERYTHING.

[stj]

Re: how to reflow laptop graphic chip

he's not got a heat gun because he's asking about the temperature.
i think he probably has an smt air station.

it needs flux injected/sprayed under the chip before you heat it btw.

[saqi80]

Re: how to reflow laptop graphic chip

yeh u right i got air station but want to know how long(duration) shud i heat it for and what temprature shud be? shud i heat it under the chip or oven the chip?
dont want to try oven anymore as i had bad experience doing with oven, it made motherboard stop working in the past so bit freaky.
Thanks for your response

[lasttarget]

Re: how to reflow laptop graphic chip

Heat gun is not the way to go. If you want to do it right you have to reball. There is no other way than to reball for a permanent fix. The problem is that the solder balls used are lead free and although they have a higher melting point then lead solder, they are more susceptible to cracking under heat strain. You must reball with lead solder balls. A heat gun will probably popcorn the chip and you will have a graphics error again in the near future.

Doing it professionally cost a lot for the equipment alone.
You will need:
stencils
IR station
Hot air gun
Liquid flux
paste flux
thermal couple(s)
aluminum foil tape
kapton tape
soldering iron
wick
suction pen

On top of that you will need a lot of experience and knowledge

Do not use your hot air gun on the chip unless you just want to use it a bit longer till it dies. If you do, a real repairman like myself wont even be able to salvage the chip.