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Old 26th October 2005, 11:06 PM   #1
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Default picture of Sonic T PCB

Hi, quick question...
has anyone got a picture of the traces under the chip please?
Thanks
Lee
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Old 27th October 2005, 02:34 AM   #2
BWRX is offline BWRX  United States
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ummm... there are no traces under a TA2024 chip (used in the SI) because it's heat slug is on the underside and is designed to be soldered to the board.
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Old 27th October 2005, 09:17 PM   #3
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Nah, there must be some pin conections underneath to enable to chip to function. It's just knowing the layout. That will finally put the whole picture together.
Not the sort of thing you do though....take the chip off the board...unless it's dead of course!
Sorry to bother you all...
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Old 27th October 2005, 11:02 PM   #4
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There really is just a ground plane with a lot of vias under the chip in the SI T-amps. No signal traces or anything. Now, if you were talking about another chip like the TA2021B where the heat slug is on top, you could run traces under the chip.
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Old 27th October 2005, 11:33 PM   #5
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I have removed one of the chips from a SI board I killed. If you check the plethora of other SI threads here, you should be able to find the info from it. The only real traces are for ground and decoupling caps. Nothing surprising -- the board is pretty much based off the datasheet.

The majority of it IS a heatslug to ground, though. All those through-plated holes filled up with solder..
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Old 28th October 2005, 12:35 AM   #6
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Hi,

Here is a picture of what is under the chip on the SI board. I was testing out my new hot air setup last night and pulled the chip off of a dead board for practice. Pin 1 is at the upper right.

Gary

Click the image to open in full size.
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Old 28th October 2005, 01:20 AM   #7
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There you go, Lee! You were right.

Thanks Gary P.
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Old 28th October 2005, 09:19 AM   #8
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IIRC, when I pulled the chips and looked at the traces, they were basically there to hook up the additional power pins. The vias at the bottom I think go to the decoupling caps on the bottom of the board. Like I said -- nothing that's a real revelation (I'd figured them out before removing the chip by toning it out with my multimeter).
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Old 28th October 2005, 12:07 PM   #9
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No big surprises, no.

But what Lee is trying to do is map out the PCB completely. Knowing what is under the chip will allow him to complete the map.
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Old 29th October 2005, 12:03 PM   #10
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Thanks Gary.....all done!

Lee
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