Power a iMac G5 iSight(A1145) with a ATX power supply?
Dear everyone, I am from China, just got a cheap iMac G5 logic board from a dead 20" model(A1145), I am trying my best to get it work again, I have modified 2 heat sinks to get them fit the original heat tube place. now the biggest problem how to power the board with a ATX PSU, I have googled for some while but with no luck, all I can find is how to power a first generation G5 with a ATX(http://jimwarholic.com/category/imac_g5), but the iSight model uses a different PSU, only 5 wires are out from the PSU, the 5 wires go into the inverter board, then 14 wires to the logic board.
The pinout of the 14-wire connector is:
I presume the LCD_PWM is used to adjust the brightness of the LCD back light, but what are the "INV_CPU_HI" and "SYS_POWERUP_L_
any help will be greatly appreciated! :)
why did you bother about the 14 pins ? - if you still have the 5 pin connector you only need to worry about the 5 pins ;-)
i've found the pinout on insanelymac:
Brown: PFW (battery powered signal between +3 and +6.5 volt to switch power supply on)
In fact on my iMac Intel 17" logicboard there's only have 12 pins.
I guess 20" needs INV_CPU_HI and LCD_PWM but 17" doesn't.
PP12V_ALL ALL for "always" on.
PP12V_RUN RUN for when PSU is on.
But PP12V_ALL and PP3V3_ALL can't be provided by an ATX PSU (there is only the PP5V_ALL)
PS_ON | PG
12V | GND
12V | 12V
5VSB | GND
GND | 5V
3.3V | 3.3V
doesn't work !