^

|

This is the case with the LED Cinema Display, anyways...

The LPC2144 also generates the three PWM signals for the HV9982.

(and - I guess - the EDID codes ans misc. others).

This is interesting, because I suspect this chip to be the culprit in the cases of failing backlight.

If it holds no firmware, it should be quite straightforward (and cheap) simply to replace the chip.