Bump. Anyone with a spare motherboard lying around want to help me figure out what two cables supply power, give me a PM or respond here. I've got a few ideas.
When you say the controller cable, do you mean the 26 pin connector or the usb cable with the controller cable? I just want to make sure we're clear before I start dissecting the cable.
Power is sent over the larger 26 pin connector and not the USB connector. The H110 controller works fine without the USB portion plugged in.
Right then. I gotta take the cable to bits and see which ones provide power. Anyone know if the power input for the DTP-H110 is different to a standard PSP? I wouldn't think so as the cable (I think, it's printed poorly) says "5V" on it, but just to check with you guys in case...?
What exactly are you trying to do with it? If all you have is the controller, and you manage to get power to it, all that will happen is the back light for the LCD screen will light up (which will be hard to see on a black screen)... Everything else is provided by the DevKit itself. There might even be more than one power feed going into it (one for electronics, maybe a separate one for the LCD backlight...). But even if it's all powered, it won't do anything since there's nothing in it but a 'dumb' LCD display and some buttons... The USB looks like it's just a passthrough from looking at the boards... What cable says '5v' on it? I don't see voltage markings on any of my H110 cables (unless it's on a smaller one inside it...) The board probably runs on 5v, not sure about the LCD though (the board may provide all it's voltage too, or there may be a separate power fed in just for that as I mentioned... Not really sure how it's designed.)
I popped my multimeter out and poked around a bit. There appears to be +2.5V and +5V running through the 26 pin connector. I'm not yet sure which lines carry data and which are used for power though so I'm hesitant to document my findings. As Psycho points out: powering the H110 will just turn the power light on and maybe the lcd backlight. All of the interesting bits are inside the tower it connects to. The chips inside the H110 controller are used to serialize the AV and control data between the two units.
Actually, I poked around the Testing Tool firmware a little bit. It will boot with only power, but will display errors if attempts to access any devkit stuff is made (so the DVD/UMD speed, things like that) Plus, I'd imagine that it operates in the same way as the regular PSP, with power going into one point and is spread out across the entire board, including the LCD. If the regular PSP runs on 3.6V, then I'd imagine it'd be around there, bearing in mind the H110 doesn't have to power a UMD drive. @aspect: Thanks for checking! When you're confident about what pins are which, do document your findings Cheers the help guys! Keep it coming!
What will boot with only power? There's nothing in a PSP DevKit controller to boot... The firmware is stored in the tower, the CPU and other processors are in the tower... The DevKit controller can't do anything by itself. Think of it as a computer monitor, by itself it just sits there, blank, powered or not... You need a computer attached to it for it to display anything...
