emc 2308 lcd panel part number made in china

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The three diagnostics LEDs (not four, because this iMac doesn’t have an external graphics card) are all on, indicating that the iMac is running and communicating with the LCD.

Since an image is displayed on the LCD the problem is not the LCD data cable. The LCD temperature sensor + cable are also working, the fan is running with low RPM when the LCD is connected.

I disconnected the VSYNC cable from the backlight board and LCD and measured it with a multimeter, it is functional, even when it doesn’t look like it is. Also no connector/pins of the ribbon cable have been bent while plugging it in or out.

Next the backlight LED power cable. I didn’t measure it because I didn’t want to disconnect it from the LCD, but it looks functional and I doubt that at least three wires fail at exactly the same time (since it supplies three groups of LEDs with power).

So I thought that this enable pin could be the problem, that’s why I used a 50kOhm resistor to pull it up to 3.3V, but it didn’t work, the LCD stayed black (could be because I failed to create a good connection between the resistor and the pin).

So, my question now is what is more likely to cause this issue, the LCD panel or the backlight board? Or what can I do to determine where the issue resides?

This is not true, here’s why; your CPU sets a limit on what memory-speed it can handle, which sets the motherboard that has it’s OWN limit of what it can handle. This last part will become “interesting” if we want to look at what an iMac can handle, but has never been explored imo.

Has anyone done a swap of the lcd screen in a late 2009 27 inch, to something newer? Are there any oem screens that can be used? I dont want to just replace existing panel. I want a newer and better panel