Editing Talk:Switch boards


== PS3 2000 series Power Eject boards, enabling contour leds talk ==
<div style="float:right">[[File:Power Eject board PS3 2000 series (light rays schematic in contour leds).jpg|1000px|thumb|left|Power Eject board PS3 2000 series<BR />(light rays schematic in contour leds)]]<BR />[[File:Power Eject board HSW-001 (Enabling contour LEDs, minimal parts version).jpg|1000px|thumb|left|Power Eject board HSW-001<BR />(Enabling contour LEDs, minimal parts version)]]</div>
This is a temporal section to discuss the simplest/easyer/safest/better way to make this mod, and the posible variations

The drawings at the right are a first sketch to discuss how to improve the drawings itself or the circuit, and are intented to replace the photos of this section in front page: http://www.ps3devwiki.com/wiki/Power_Eject_boards#Modding

*Light rays bouncing photo (this goes first because is easy to discuss)
**I could not find a better one where the first bouncing surface is more visible, this first surface is the most important but also the curve for the next bounces, is good to cover this with a mirror sticker (by sticking it in the case, this way the glue layer is at the other side)... no photo of this sticker
**Is barelly visible the light ray starts in verticall, and after the first bounce is in horizontal... arrows didnt helped

*Circuit squematic photo

The cutted trace in pin1 is just because the board was designed to be controlled this way, even if is not in retail models is probable that exist a prototype with it (or is connected to an intermediary device), also is needed to be 100% sure the pin goes nowhere (is posible the trace goes to an internal layer of the motherboard not visible in the surface and emerge again in a syscon pin)

The cutted trace in pin 3 to disable the 4 white leds for power eject buttons backlight is just a paranoid meassure to controll the total current of the board (you are adding 4 leds, so other 4 "needs" to be disabled)

The transistor base pin goes in-line with the other unpopulated transistor base pin, both does the same function at the same time, each transistor is in chargue of 2 leds with a common capacitor (the transistor opens/closes the leds ground lines, and when the line is opened the zener diode works as an "voltage regulator" for the subcircuit avoiding "voltage peaks"). These transistors are "isolating" the subcircuit at his left

The unpopulated resistors values are dependant of the leds added, so no need to add the values to the drawing


*Bonus brainstorming
**If the pin1 line is really disabled, we can use it to carry other signals from the motherboard, like a temperature sensor, the PWM pulse of the fan, etc... add a small microcontroller in the power eject board with code to controll leds based in temperature (a PIC is a good candidate and there are 5v in the board) or even some kind of small display, etc...