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_BUF" pins for?
any help will be greatly appreciated! :)
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Thanks for your reply Markus:)
The problem is I don't have the DC-DC board, all I have is the logic board, now the diagnose LED 1 and 2 are on, and the white power LED can be turned on after the power button pressed, and I can feel some heat from the CPU and GPU， but after about 8 seconds, it automatically turned off... it seems there is no POST, I've got a USB flash disk, when normally it's plugged into the USB port, it flashes its LED a few times, indicated that it has been configured by the USB host and the LED then goes to constant on, but when I plug it to the G5 board, the LED flashes all the time, I presume either the USB host on the board is broken, or not being powered on, or it is being kept at Reset state by the POST process(don't know how mac do the POST process)? or I didn't get the board powered properly?
can anybody give me some tip where the problem might be? I REALLY REALLY want to have a PowerPC machine as my working platform.
Thank you in advance and for my poor English...
check out this webpage - maybe it helps
door markus weiher
I have a 20" imac need to replace the power supply too, did you fix this finially?