QUOTE(NeoSHODAN @ Jan 7 2007, 07:54 AM)
Someone asked why I believe the empty pad is a resistor. I'll avoid numerics and speak generally... Makes things far easier for me. Having a resistor there allows you to limit the current and the voltage that an LED is subjected to, allowing it to turn on without blowing up. A capacitor, on the other hand, wouldn't have the same effect. If a capacitor was placed in that position, it would block the power attempting to flow through the LED. It would build up a charge instead of allowing electrons through, essentially cutting the LED off from a power source.
I know what a resistor and capacitor are. Seriously, I'm not completely ignorant; I'm just no expert. I've taken a couple classes and I've built small electonic projects from analog sound amplifiers to digital video encoders. Anyway, since my image ended up being backward anyway, it's just a pass through for a positive feed to the IC. It could be a resistor if the IC needs less than 2.8V but it could be a capacitor if the IC needs a more consistant power. The positive side is always live.
QUOTE(pablot)
theBloodShed: That led is definitely the wrong way around in your picture. I would suggest that you change it before someone breaks something.
Yeah, I had already realized that after I actually tested the board. Unfortunately, I made a new image but it looks like the forum doesn't allow post edits after a certain time.
QUOTE(pablot)
Now, that pad is definitely for a resistor, not a capacitor. It connects to the leg of a MCU, so having a capacitor there makes no sense. The reason why there is no signal from the MCU is pretty evident. They didn't include the LED on the board so why should they control it from firmware? There really is no reason for it. So that is just a dead point. I guess you can use the led pads to easily mount the resistor and then use the resistor pad to patch in a wire to ground. It'll make a neat and clean install.
You could be right, but without a datasheet for that IC there is no "definitely". Hell, it could even be for a 0 ohm resistor making it nothing more than a bridge. Anyway, it's true that the firmware on the chip may ignore that point completely. It's too bad.
I did find this
interesting document. On page 8 they show the controller's mainboard and they took the metal casing off that chip. The chip is labeled SCEI (Sony Computer Entertainment International I assume) and CSR. It also looks like it has some flash memory and a built-in crystal oscillator.