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Questions tagged [pcb]

a material resistant to electrical conductivity that forms the platform upon which electrical components and wires can be mated (or printed) and connected to form a circuit. Usually confused with printed wiring board.

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55 views

Finding the function of test points on a router

I have a BCM3383 based cable router here where I ultimately want to dump the firmware. I have serial access to the broadcom bootloader and the linux console. Login for linux is unkown and telnet does ...
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1answer
711 views

In-circuit programming of SPI Flash memory

Is it possible to define (using only visual inspection of PCB and multimeter) whether or not SPI Flash memory can be properly programmed keeping the device In-circuit, without desoldering IC from the ...
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4answers
2k views

Identifying an unknown chip on a PCB

I'm working on reverse engineering a PCB (no documentation by manufacturer). I've identified all the other chips on this board but this one refuses to give up any google-able info. Are there any ...
5
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4answers
10k views

How to convert finished PCB to schematics effectively?

I have a PCB board that is a little involved to figure out its working. I spent a good day mapping trace by trace, node by node but still some node connections wouldn't make sense. I know designers ...
7
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1answer
229 views

How can I work out which PCB layer a via goes to, without destroying the board?

I'm trying to reverse engineer some boards that have multiple layers, but can't figure out any way of discovering which layer certain vias go to. Unfortunately I can't destroy the board with ...
9
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1answer
1k views

Draw circuit of a multilayer PCB

I have found a multilayer PCB of which I need to draw the circuit. At first, I tried to find the circuit on the internet using part numbers, but I did not get any result. The PCB is from a very old ...
6
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1answer
983 views

Determining communication protocol

I have two chips that are connected using two lines. One appears to be the clock line (50% duty cycle), but it doesn't have to be (sometimes constant high). The other line appears to be totally random,...