Can't get BGA chip off is it glue?

[highpulse]

Re: Can't get BGA chip off is it glue?

210 for top is few if its unleaded .
if its unleaded think more about a short peak time of 230 degrees . meaning short time , 10 to 20 seconds , more than this you might kill the layers of the chip

[dellxps15]

Re: Can't get BGA chip off is it glue?

what i mean is instead of get up and down same ... let's say 230° and chip free to lift,

what about 250 down and 210 up also with chip be able to get removed easly.

you know that if u heat one side of the board much.... u can remove a component in the opposite side.. so better get same temperature up - down or always better try to keep bga safer and increase lower temperature as many people do ?

[highpulse]

Re: Can't get BGA chip off is it glue?

well it all depend on the thickness of the board , and your local area temperature like i mention before they are a lot of outher factor that we must count .

[sasser]

Re: Can't get BGA chip off is it glue?

im use bga rework from jovy re8500. my peak tempreture is 220c in 20s. sometime i can lift the bga and sometimes cant. when can lift i put the flux or just raise the tempreture to 225 not exceed 230c. becaful with high tempreture can make popcorned or motherboard bend. but u can avoid with prebake or put hte kapton tape 2-3 layer on bga. This must make practice and practice more another challange is if the bga still have glue underneath. im use insat remover epoxy. this is the good glue remover i hav.

[Ramee]

Re: Can't get BGA chip off is it glue?

I heard that Jovy RE8500 is a good machine that you can controll upper and lower heater in separate way.

[Th3_uN1Qu3]

Re: Can't get BGA chip off is it glue?

you know that if u heat one side of the board much.... u can remove a component in the opposite side.. so better get same temperature up - down or always better try to keep bga safer and increase lower temperature as many people do ?

Have the bottom heat as high as you can get away with. The board should reach 150C on the top with bottom heat alone, before you start the profile on the top heater.

To avoid damaging things like connectors and other bits of plastic, i just cover the whole board in aluminum foil (the regular kind used for cooking), leaving open only the area where the BGA is. I leave 1-2 cm around it on the bottom, and less on the top. Just enough to be able to place the probes.

[dellxps15]

Re: Can't get BGA chip off is it glue?

i have a full ir, so no big problem with plastic, but even so i use alluminium + kapton on top and left only bga exposed.
on bottom i put no cover.

[sasser]

Re: Can't get BGA chip off is it glue?

yes jovy re8500 can control power percentage upper,bottom and side heater. im control the IR heat with setting not more than 80% of heater power for each stage from preheat till reflow stage. but beware i hav motherboard bended when the power is got too high cause thermocouple error reading or not stable to pcb board thats disadvantage of my re8500.

[vektro]

Re: Can't get BGA chip off is it glue?

Hello guys,
recently i used a ZM-R5830 reballing station. I tried 5-6 times to desolder a chip from a broken board.
i used a lot of differents programs for lead free boards and i had zero success....
i use jelly flux of warton.
i cant find what i am doing wrong. i am thinking i am using wrong flux...
could you help me?

[jasko_jacker]

Re: Can't get BGA chip off is it glue?

I use a ir self-built station, using professional stations parts. (A project for university group)
I added a third thermocouples, for security; turn off all at 250 ° C.
For me, the most important part, in addition to the right profile, is the preparation of the chip.
Only for desoldering lead free chips, injection with a syringe a flux made only for this purpose. It 'very dense and can not be used for other purposes.
For reballing, use only, not lead-free balls; in this way I must not exceed 205 ° C. This process, however, requires the preparation of the chip, and the card