Hi all, I read that in some cases to clear bga with a non ultra expensive (permit to change the frequency ) ultrasonic wash can damage the chip.
Some experience....
thanks
I use the same method with no problem, but I assume that the article I read, referred about an issue of separation between the die and the golden thread. It's possible?
How liquid you use ? I try some liquid and various temperature but I have the best result , especially to remove the flux after a reballing, with a isopropil alcool at 60-70 C° or for particular cases an ersa solvent. with distilled water, the results are poor as well as with specific liquids, probably for the frequency, my bath operates at 44 Khz but I read of devices operating at much higher frequencies.
The only damage i have read about is if the chip touches the inside of the bath, which can cause physical damage to the chip and also the bath. The chip/item should be in a try or suspended.
I use IPA in my bath but i don't clean BGA chips in mine.
An ulrasonic bath shouldn't damage the bga. I've done not only phones, but also CPUs, tablets, laptop motherboards and other PCBs. The weirdest thing that I have fixed with an ultrasonic bath was an iPad camera. Isopropyl alcohol didn't work, but after the bath it worked like new.
I did not know an ultrasonic cleaner is not ESD safe - i removed the plastic tray from mine when i got it, and forgot where i've put it. I've cleaned lots of BGAs in it and it didn't damage any of them. But i always put the BGAs in with the pads facing up.
Originally posted by PeteS in CA
Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
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