Some displays have the boards mounted components up and others components down. The former are a bit of a pain to probe in the live system since some of the test points are not accessible.
Which leads me to ask, in general, can PS and inverter boards be tested in isolation? By "in isolation" I mean the board is plugged into a power source (the wall for the PS, a power supply of the appropriate voltage for the inverter), but nothing else. The inverter would of course be plugged into the CCFL in those instances where it is possible to arrange the leads to do so when the board is flipped over.
I'm guessing that both PS and inverter boards are OK when they are driving "nothing". However, I do wonder if the "backlight off" and "PS sleep"/"Low power" signals might not be active low, in which case the corresponding board would shut down in isolation.
Which leads me to ask, in general, can PS and inverter boards be tested in isolation? By "in isolation" I mean the board is plugged into a power source (the wall for the PS, a power supply of the appropriate voltage for the inverter), but nothing else. The inverter would of course be plugged into the CCFL in those instances where it is possible to arrange the leads to do so when the board is flipped over.
I'm guessing that both PS and inverter boards are OK when they are driving "nothing". However, I do wonder if the "backlight off" and "PS sleep"/"Low power" signals might not be active low, in which case the corresponding board would shut down in isolation.
