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GCP-power not being supplied to backlight inverter

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cmtk0101

20 Posts

Posted - 12 Sep 2004 : 10:32:33

I am having a problem with supplying power to the backlight inverter. I am using the same board that prevously worked fine with the same LCD panel. I am also using the same reg/hwt files that I've been using for all my other units with the same LCD panel. I have verified that the cables are perfect!! I have double checked the jumper setting on the board as well.

WHAT CAN I DO??? A couple of things that I've noticed happening:

1) When the unit powers on the backlight flicker on for a millisecond a couple of times. This normally happens during boot up before the backlight fully comes up.

2) When I hit the reset button I am able to see the touch calibration screen for a second. This is very interesting! Clealy, the unit boots fine and there is no problem with the panel. Even though I see the touch calibration screen for a quick second when I hit the reset button, if I continue to hold down the reset button the backlight continues to be lit.

What do I need to change that the reset button is bypassing in order to supply power to the backlight?

I am all out of ideas...please help.

Thank you.

Jarret

akidder

1519 Posts

Posted - 12 Sep 2004 : 17:36:46

Thanks Jarrett. As we have discussed in previous phone and email conversations, this is probably a hardware problem, since your software hasn't changed.

You'll need to probe the backlight power signals to determine what is going on.

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