garrettp
New Member
Hi all,
I am new to the forums but trying to figure something out with LCD's from apple.
I have a 20" iMac G4 with an LCD that does not light up. I have tried 3 different inverters to no luck. At night it does glow enough to use it in extreme darkness but that is about it. So, the CCFL's are getting some power but I need to figure out if the CCFL's are bad or if it a problem from the logic board (Apple's term for motherboard).
The inverter has 8 pins in as described below. I can supply pictures of PCB if needed.
Blue = 11.93v
Red = 11.93v
Blk = GND
Blu = GND
N/C
Yel = .2mv
Prpl = 3.262v
Orng= no voltage detected
So, it seems to me that with the 12V (blue and red go to fuse on inverter PCB) and 3.3v, the lamps should ignite correct?
However, I am under the assumption that the 3.3v is the on and off and the Yel & Orng are for brightness control. Does that sound correct?
With that, I have a 20" LCD with known working CCFL's coming from an iMac G5. The only problem is it uses LVDS vs TMDS that the G4's use. I do not know if it will simply plug into the G4 even though it is the same connector. I do think however that I can plug the G4 inverter into the G5 display and get lamps (from what research I have done). I would however like to be able to use [on of] the displays as an external monitor and do have pin configs for the video cable. I just need some help with getting the inverter powered up.
Thank you for your help and man am I glad I found these forums. I am not an electronics guru but I am great at SMD rework and have a little knowledge of how things work.
garrettp
I am new to the forums but trying to figure something out with LCD's from apple.
I have a 20" iMac G4 with an LCD that does not light up. I have tried 3 different inverters to no luck. At night it does glow enough to use it in extreme darkness but that is about it. So, the CCFL's are getting some power but I need to figure out if the CCFL's are bad or if it a problem from the logic board (Apple's term for motherboard).
The inverter has 8 pins in as described below. I can supply pictures of PCB if needed.
Blue = 11.93v
Red = 11.93v
Blk = GND
Blu = GND
N/C
Yel = .2mv
Prpl = 3.262v
Orng= no voltage detected
So, it seems to me that with the 12V (blue and red go to fuse on inverter PCB) and 3.3v, the lamps should ignite correct?
However, I am under the assumption that the 3.3v is the on and off and the Yel & Orng are for brightness control. Does that sound correct?
With that, I have a 20" LCD with known working CCFL's coming from an iMac G5. The only problem is it uses LVDS vs TMDS that the G4's use. I do not know if it will simply plug into the G4 even though it is the same connector. I do think however that I can plug the G4 inverter into the G5 display and get lamps (from what research I have done). I would however like to be able to use [on of] the displays as an external monitor and do have pin configs for the video cable. I just need some help with getting the inverter powered up.
Thank you for your help and man am I glad I found these forums. I am not an electronics guru but I am great at SMD rework and have a little knowledge of how things work.
garrettp