Imac G4 20 Inch display issues, inverter maybe?

GrandFraganator · GrandFraganator #1 (**permalink**)

05-12-2011, 10:05 PM

I have been given a 20Inch Imac G4, its very nice.
But there is no display on the screen, I have shone a torch on it and can not see a image when booted up, However I can see the backing light.
Plugging in an external screen works fine so the logic board should be fine (As far as I know)
I have been able to load the install disk to 10.3 using the external screen.
Im only asking because when I search it seems that normally if its a dead inverter there is no backing light on the screen but there is a image but I have the opposite.

Any advise would be greatly appreciated.
Thanks guys - Jeremy

Stretch · Stretch #2 (**permalink**)

05-12-2011, 10:08 PM

There might be a loose connection on the display, or the display might be gone.

GrandFraganator · GrandFraganator #3 (**permalink**)

05-12-2011, 10:24 PM

Thanks for your quick reply
Do you think that having the backing light on the screen rules out the inverter?
Ill try to open it up and see if I can move the connections around.

GrandFraganator · GrandFraganator #4 (**permalink**)

05-12-2011, 11:19 PM

I took apart and put back together all of the connections from the motherboard to the neck of the computer.
It didn't change anything.
There is a component on the motherboard that makes some weird sounds after boot up and the back light is on for a little bit. I made a short video of this and showing the screens backing light going out as I turn off the computer.
YouTube - Imac G4 20 inch no display and emmiting noise

Stretch #2 (permalink)
Member Since: Jan 13, 2007 Location: Central New York Posts: 4,614 Mac Specs: 15in i7 MacBook Pro, 8GB RAM, 60GB SSD, 500GB HD	05-12-2011, 10:08 PM There might be a loose connection on the display, or the display might be gone. Blog and Photo Gallery: http://philolin.me/ Currently running OS X 10.8.2
	QUOTE Thanks

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Imac G4 20 Inch display issues, inverter maybe?

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GrandFraganator #1 (permalink)
Member Since: May 12, 2011 Posts: 3	05-12-2011, 10:05 PM I have been given a 20Inch Imac G4, its very nice. But there is no display on the screen, I have shone a torch on it and can not see a image when booted up, However I can see the backing light. Plugging in an external screen works fine so the logic board should be fine (As far as I know) I have been able to load the install disk to 10.3 using the external screen. Im only asking because when I search it seems that normally if its a dead inverter there is no backing light on the screen but there is a image but I have the opposite. Any advise would be greatly appreciated. Thanks guys - Jeremy
	QUOTE Thanks

GrandFraganator #4 (permalink)
Member Since: May 12, 2011 Posts: 3	05-12-2011, 11:19 PM I took apart and put back together all of the connections from the motherboard to the neck of the computer. It didn't change anything. There is a component on the motherboard that makes some weird sounds after boot up and the back light is on for a little bit. I made a short video of this and showing the screens backing light going out as I turn off the computer. YouTube - Imac G4 20 inch no display and emmiting noise
	QUOTE Thanks

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