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Is there a way to test a BGA chip before soldering?

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ablacon64:
Hi!

A notebook came with a black screen, typical BGA cold solder problem. I reballed the chip, AMD RS780, and the motherboard died. :(

After removing the chip I noticed that some capacitors on top had zero ohms resistance, is this normal (remembering that the chip is off the board)?

The marked capacitors are the ones I'm talking about:


So, I wonder if there a reliable way to test a BGA chip before soldering it to the board. Of course, there's no way to test the functionality, but at least test if it's shorted or not.

ElektroQuark:
They are probably decoupling capacitors so it looks like you have some bridges between VDD and VSS lines.
Try desoldering, reballing and soldering again the IC.

usreworkstationsMODS:

--- Quote from: ablacon64 on November 08, 2011, 10:10:41 am ---Hi!

A notebook came with a black screen, typical BGA cold solder problem. I reballed the chip, AMD RS780, and the motherboard died. :(

After removing the chip I noticed that some capacitors on top had zero ohms resistance, is this normal (remembering that the chip is off the board)?

The marked capacitors are the ones I'm talking about:


So, I wonder if there a reliable way to test a BGA chip before soldering it to the board. Of course, there's no way to test the functionality, but at least test if it's shorted or not.

--- End quote ---

Have you tried to use Multi-Meter and thermcouple ? From what that pic I am saying, you do need to clean up by desoldering, and make new one. Have you tried that?

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