Can anyone tell me what these PSU pin abbreviations mean? PSU 614-0446
Hi all. I’ve gutted a 27” iMac that suffered the near-universal GPU failure, and I’m converting it into a monitor with a cheap LCD-driver board from eBay. Instead of a likewise cheapo PSU and inverter, I’m trying to use the original Apple ones. I found a pinout of the PSU’s output connector, but don’t know what some of the abbreviations mean or their function. Can anyone help? I don’t have the motherboard to trace anything back to, so that’s not an option.
Update (07/27/2020)
Well, I got the whole thing working. I ran a switch to ground the PS_ON line as required, which activates the stock PSU. The PSU has several 12V outputs, so one of them powers the LCD driver board, another goes through a converter to provide 5V to the backlight-on signal, and another gets converted to 3.3V for a PWM module to control the backlight brightness at 150 kHz.
The LCD driver board had its own power supply for the backlight, but some reviews said it asn’t as bright as the stock one so I added the PWM module to drive the stock one.
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3 comentarios
Hi. Could you elaborate on how you got the builtin inverter working? I'm trying to do the same by converting my imac to a display.
- de Jo Dee Lee
Hey, could you please explain how did you connect and which PWM module did you use? I'm trying to achieve the same
Thanks!
- de Teste di modi
Could you please elaborate how you got the original inverter running? I have started converting my 2009 27" iMac to a monitor with one of the controller boards from eBay/AliExpress and while it does work I would very much prefer using the original inverter.
- de Damon Stahl