Question about Apple iMac G4 20" Mac Desktop

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I have a 17 inch g4 imac with no backlight on the screen

Im not sure if its the logic board as i can see and do all functions but its so so faint and if i use a torch i can see everything working fine ..it as if the backlight isnt working ..can it be fixed of is it a problem that would lead me to scrap my favourite little friend ...help

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  • Apple Master
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Its either going to be a problem with the lcd or the inverter which is why your getting the very dim screen.

Posted on Jun 10, 2009

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I have an imac mac but my screen isnt working but the motor is coming on how can i fix that


This can be a ribbon cable, dead logic board, or dead display. This will require a trip to the "Genius Bar".

Jul 02, 2012 | Apple iMac G4 Desktop

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No chime no fan no screen on Imac G4 17', even after reset of the PMU


Could be a problem with the logic board. If you have Applecare, take it to an Apple store and they might be able to fix it. Otherwise, it may be dead.

Mar 07, 2011 | Apple iMac G4 17 in (M8935) Mac Desktop

1 Answer

I have an imac intel 17" which is kernel


If someone has looked at this issue and determined it to be a logic board problem then the only solution is to replace the entire logic board.

You can purchase them on usedmac.com here for $289:
http://www.usedmac.com/catalog/product_info.php?cPath=34_160&products_id=2384&osCsid=555099ea1dd6e69fa573fbc345fbe149

Here are instructions on replacing the logic board yourself:
http://www.ifixit.com/Guide/Repair/Installing-iMac-G5-17-Inch-Model-A1058-Logic-Board/971/1

Feb 06, 2011 | Apple iMac 17" Desktop

1 Answer

Imac g4 won't start but shuts down when apple logo appears on screen


Are you sure the iMac is really shutting down or just turning off the backlight? The tell-tale sing would be to let the unit fully boot-up (wait 3 minutes) and the press the button the apple keyboard that ejects the CD-ROM. If the CD-ROM door opens, you iMac is running with disabled or broken backlight.
The inverter circuit on the iMac G4 is known to be weak.
There could be another problem, though. The iMac G4 is also known to have weak internal power supplies. Here's how you can tell:
Hold down the CMD OPT "O" and "F" keys at the same time while pressing the power button. This will tell the iMac that you want to boot into the Open Firmware shell, bypassing the Mac OS X startup. If this works, your power supply is good, the inverter is good and you have a problem with your Open Firmware boot string. To fix the boot string, Power on the unit while holding down the keys CMD-OPT-P-R to zap the parameter RAM (PRAM) and reset everything to defaults.
If you were not able to boot into the Open Firmware shell, your problem is either a failed power supply or a failed screen backlight. The last possible culprit is your iMac could suffer from "Bulging Capacitor Syndrome", where a batch of iMac G4s, iMac G5s another electronics were fitted with a bad batch of capacitors. Eventually, the caps will rupture and cause irreparable damage to the logic board. Only way to verify this is to pull the unit apart and visually inspect. If you see little green or blue cylinders that seem to be bulging or oozing a thick oily goo, that's your problem. Only recourse is to shop around on eBay and look for a replacement logic board.

May 30, 2010 | Apple iMac G4 Desktop

1 Answer

How can I change an iMac 17' screen


Here is the guide to the 20 inch...these may work out the same, I'm not sure.

http://www.ifixit.com/Teardown/iMac-Intel-20-Inch-EMC-2266/658/1

Oct 12, 2009 | Apple iMac 17" Desktop

1 Answer

Backlight inverter installation instructions


Hi, Sorry to hear you are having problems,

Here is the link:
http://www.baconeggs.co.uk/images/dmm/imac17-inch.pdf
Good luck, keep a steady hand.

Mar 20, 2009 | Apple iMac G4 Desktop

1 Answer

Problem with Apple imac Power Supply


The most common problem with imac G4/800's are failing logic-boards. This will cause the mac to not power up at all giving the impression that the PSU is broken. 
If however, you are indeed certain that the fault is with the power supply, they are available from many stores online
Power Supply for iMac G4 15" LCD (700 & 800 Mhz) 661-3184 614-0147

Dec 09, 2008 | Apple iMac G4 Desktop

1 Answer

Usb ports broken


whats the serial # i can look up logic board # for you

Oct 21, 2008 | Apple iMac G4 Desktop

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