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Recommended max board temp for BGA repair

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rrylande

#36047

Recommended max board temp for BGA repair | 10 August, 2005

Does anyone have suggestions or observations on what my maximum board temperature should be when doing BGA repairs on an SRT?

In other words, How hot is too hot?

Somebody set the bottom heater on our new BGA repair machine to blow at 275 C, and our boards are consistently reaching temperatures of 150+ during repair.

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#36049

Recommended max board temp for BGA repair | 10 August, 2005

"Too Hot" is any more heat than what is needed to reflow the solder. You should have the Auto-Profile software for the machine, this will accurately monitor and record temps. There is also port for the component itself to monitor package temp. There are a lot of variables to the rework process, which makes it nearly impossible to make firm recommendations here. You can contact applications support at VJE/SRT: 1-978-425-9446

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rrylande

#36052

Recommended max board temp for BGA repair | 10 August, 2005

I am concerned about delamination and other modes of damaging the board itself. Am I mistaken to believe that raising the entire board to near reflow temperatures (during the repair of a single BGA) may damage the quality of the board?

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Inds

#36053

Recommended max board temp for BGA repair | 10 August, 2005

wats the thickness of your board.. and the dimension.. I would not heat the board beyond 150deg C.. coz if the board is thick and large.. it will take a long time to reach that temp..and you will burn off your flux.causing poor solder joint.

Inds

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rrylande

#36055

Recommended max board temp for BGA repair | 10 August, 2005

The boards I am referring to are definitely thick and large. But, on thinner smaller boards, is it OK to bring the board up to those higher temps because it takes less time?

Many of the boards I am dealing with (large and small) are reaching 150-155 deg C when I try to Auto-Profile them on the new BGA machine.

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Mika

#36095

Recommended max board temp for BGA repair | 12 August, 2005

Does the pcba:s comes directly from the assembly line, You are going to do rework on? If faulty pcba:s comes back from, let say a customer from outside or the pcba:s has been on Your shelf for some days/weeks, exposed to open environment (humidity in your room); consider baking the boards prior to do BGA repair, because of the moisture build up within the board. Especially critical for RoHS BGA repair.

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