I'm still very new to this so I don't quite understand
Biverted screen:
- the image on the screen is inverted
- the plolarisation filter is turned 90 degrees
right?

I don't think you can see anything without turning the polarisation filter..

Ah. Didn't know you were doing it that way! What I am suggesting is that you purchase a biversion chip (like this one at kitsch's store http://store.kitsch-bent.com/product/hex-dmg-v1) and wire it in, as well as returning your polarization film to its normal position. If you wire the power for the LED backlight as well as the hex inverter to the double pole double throw switch (acts as 2 switches operating in-sync essentially), you can set it to be backlight-off-and-no-inversion, or backlight-on-with-hex-inversion by flipping the switch. That is a small investment, likely to cost less than $15, that can remedy your issue with a little bit of handywork.

EDIT - not 100% sure of how well it would work using the kit I listed, but I do know that switchable backlights as well as hex inverters have been done before (but not at the same time).

KineticTurtle via his blog:
http://kineticturtle.blogspot.com.au/20 … meboy.html

This helps a lot. It seems the hum is heard through the speaker / headphone jack and not directly from the backlight. I'm gonna get one as soon as they're available and do some tests.

Glad this was helpful - make sure you see the re-edit about pulling power directly from the power supply pcb - it makes a HUGE difference.

This helps a lot. It seems the hum is heard through the speaker / headphone jack and not directly from the backlight.

this is true(for mine at least). slight hum through headphones thats covered up while music is playing. i have an rca on it that doesnt have any hum at all. the light really is very purty too.

This helps a lot. It seems the hum is heard through the speaker / headphone jack and not directly from the backlight. I'm gonna get one as soon as they're available and do some tests.