Apple /// Power Supply

[Chuck Guzis]

On 1 Jun 2007 at 14:51, Jules Richardson wrote:

> Surely it's as much effort whether circuits repeat or not? Don't you still 
> have to check all possible interconnects to make sure that you've got 
> everything traced right, even if a quick visual inspection might make it 
> appear that there's a lot of repetition?

So, you're saying that it's easier deciphering a PCB with a couple of 
544-conductor house-numbered BGAs on it than working through a PCB 
with 1000 discretes?  

I know how a transistor (resistor, capacitor, inductor) works, but I 
lack the psychic abilities to figure out what a house-labeled (or 
better, unlabeled) QFP, BGA or even a large DIP does, particularly if 
the maker's gone out of business.  I have a ghost of a chance of 
figuring out (and repairing) the discrete board, even if the 
transistors are house-numbered.  But I'm out of luck and skills 
working out a board filled with custom ICs with no data.

Cheers,
Chuck