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qbancoffee / imac_g3_ivad_board_init

iMac G3 IVAD board initialization with an arduino
GNU Lesser General Public License v3.0
146 stars 14 forks source link

CRT no picture? #18

Closed Linkneo5 closed 1 year ago

Linkneo5 commented 1 year ago

Hi all,

I should preface this by noting I am a complete amateur and likely am missing something obvious but I would love some help.

Everything is set up, but when I turn on the power the screen remains black. There is a green light indicating power and I can hear static when the CRT is turned off and on. But no image and the computer cannot detect it at all. I did make sure to comment "externalCircuitOff()" under when "vsyncDetect is 0".

Info: The iMac works with the original logic board, I am not using an VGA to HDMI adapter (though I will try it) and I have tried a couple different cables and two different PCs.

Any help would be appreciated. Thanks for your time.

Linkneo5 commented 1 year ago

OK, so I am an idiot. I had two problems: I added the wrong library when programming the MIC (I downloaded Softwire not SoftwareWire) and my VGA to HDMI adapter was HDMI output ONLY. So yeah, rookie mistakes all around. Ordered a new VGA adapter from Amazon (a DTECH HDMI to VGA Adapter with HDMI OUT) and boom. Tested and works! PS3 via HDMI out to the iMac G3 works great! Now to get a MiSTer or one of my older consoles hooked up :)