Hi all,
It is probably no secret that I am designing a replacement Indy PSU using off the shelf DC-DC converters. While that is a matter for another series of posts, along the way I have collected some basic information about the functioning of the Indy PSU.
If referencing or duplicating this information, I ask that you maintain a prominent link to this original forum post for further updates, as well as a credit by name.
To start that off, here is the power supply pinout from the motherboard's perspective:
Power is supplied on a 20-pin Molex Mini-Fit Jr. type connector, with the motherboard side being the male connector and the power supply side being female. The pin numbers are as per the mechanical drawing.
The +5V standby is supplied when the power supply is connected to AC line power but has main power turned off via the motherboard. I am guessing the -12V rail is for audio amplifiers.
Auxiliary connections are supplied on a 20 position 0.1" spacing (2x10) pin header, with the motherboard side being male and the power supply side being female. Noting the position of the connector key, pin numbering on these connectors alternates between the bottom and top row, starting from the bottom left.
The power supply is controlled by pin 3 (Run), which is "ground to stop." It naturally floats at +5V (standby), meaning that disconnected from the motherboard, the power supply runs and supplies regular power. The motherboard grounds out this pin to stop the power supply.
The temperature sensor appears to be a thermistor. I have not yet characterized it but will do so in a later follow up. It appears to control the fan speed, dramatically so for Sony models.
Many people also seem to be unaware that the Indy does have a reset / reboot switch. This switch is the small nub beneath the power switch.
To aid in Indy power supply testing, I have made a small breakout board. I may release or sell this design (if there is interest) in a further update. More Indy PSU information to follow!
It is probably no secret that I am designing a replacement Indy PSU using off the shelf DC-DC converters. While that is a matter for another series of posts, along the way I have collected some basic information about the functioning of the Indy PSU.
If referencing or duplicating this information, I ask that you maintain a prominent link to this original forum post for further updates, as well as a credit by name.
To start that off, here is the power supply pinout from the motherboard's perspective:
Power is supplied on a 20-pin Molex Mini-Fit Jr. type connector, with the motherboard side being the male connector and the power supply side being female. The pin numbers are as per the mechanical drawing.
The +5V standby is supplied when the power supply is connected to AC line power but has main power turned off via the motherboard. I am guessing the -12V rail is for audio amplifiers.
Pin # | Wire Color | Function |
---|---|---|
1 | White | +3.3V |
2 | White | +3.3V |
3 | Red | +5V |
4 | Red | +5V |
5 | Red | +5V |
6 | Red | +5V |
7 | Red | +5V |
8 | Red | +5V |
9 | Green | +5V Standby |
10 | Light Blue | -12V |
11 | Black | 0V |
12 | Black | 0V |
13 | Black | 0V |
14 | Black | 0V |
15 | Black | 0V |
16 | Black | 0V |
17 | Yellow | +12V |
18 | Black | 0V |
19 | Black | 0V |
20 | Black | 0V |
Auxiliary connections are supplied on a 20 position 0.1" spacing (2x10) pin header, with the motherboard side being male and the power supply side being female. Noting the position of the connector key, pin numbering on these connectors alternates between the bottom and top row, starting from the bottom left.
The power supply is controlled by pin 3 (Run), which is "ground to stop." It naturally floats at +5V (standby), meaning that disconnected from the motherboard, the power supply runs and supplies regular power. The motherboard grounds out this pin to stop the power supply.
The temperature sensor appears to be a thermistor. I have not yet characterized it but will do so in a later follow up. It appears to control the fan speed, dramatically so for Sony models.
Many people also seem to be unaware that the Indy does have a reset / reboot switch. This switch is the small nub beneath the power switch.
Pin # | Wire Color | Function |
---|---|---|
1 | N/C | |
2 | Brown | Temperature Sensor Control Voltage (0-5V) |
3 | Red / White | Run (Ground to stop) |
4 | Orange | Power good signal |
5 | N/C | |
6 | N/C | |
7 | N/C | |
8 | N/C | |
9 | Gray | Power switch (other leg to Switch Common) |
10 | White | Volume Up switch (other leg to Switch Common) |
11 | Blue / White | Volume Down switch (other leg to Switch Common) |
12 | Periwinkle | Reset switch (other leg to Switch Common) |
13 | Black | Switch Common |
14 | Red | LED Common (Anode) |
15 | Violet | Red Status LED (Cathode) |
16 | Violet / White | Green Status LED (Cathode) |
17 | Orange / White | Speaker (terminal 1) |
18 | Green / White | Speaker (terminal 2) |
19 | N/C | |
20 | N/C |
To aid in Indy power supply testing, I have made a small breakout board. I may release or sell this design (if there is interest) in a further update. More Indy PSU information to follow!
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