Black screen on late 2009 imac after hearing a static "pop"

[larryf]

I had replaced the video connector on the main board and was testing the screen in place when I over stressed the vertical sync cable and pulled it from the monitor. The cable swung down and bounced onto one of the boards causing a sharp static "crack". The monitor went dark, no back light.

I believe I destroyed the lcd inverter board and I need to check the voltages to the monitor connector on the board. All I am finding is 11.83 V and ground. I tried to find the tech information on the inverter board (V267-601HF) on the web to no avail. Does anyone know the output voltage specs of the board or perhaps is aware of a link that supplies this information? I don't want to replace the lcd display unless I must.

Just so you know, I have already tested the computer with an external monitor and all works well. Also as mentioned above I cannot detect a back light.
I am new to working on MAC's of any kind so I am somewhat out of my element here so any assistance anyone can provide is greatly appreciated.

Thanks,
larryf

 

[Cory Cooper]

Hello and welcome.

Since Apple holds their hardware properties close to the vest, there aren't any schematics floating around out there. Even the Apple Genius folks do not do component-level repair, or have access to most high-end technical information.

It does sound like an inverter board and/or the display panel itself was fried. Not much more information to give there.

Hope that helps and you find a solution.

C

 

[larryf]

Cory,
Thanks for your nice and helpful reply. I am now fairly sure its one or the other so I have decided to initially try replacing the inverter board since it appears to be the least expensive option of the two. If this solves the problem I will measure output voltages and post the results on this forum with hopes that it might be helpful to others.
Thanks again,
Larry F.