Hello All,
I've been working on an 820-00165, currently with no backlight. There is a picture on the screen. At an earlier date, the backlight was working but it would drop out regularly, and sometimes not come on at all. I replaced U7701 thinking it might be a corrosion issue, but it wasn't. I haven't been able to get the backlight to come on since even though the screen does activate and I can see a flashing folder when lit from the back.
I have confirmed after the U7701 replacement that I have the following:
PPVOUT_SW_LCDBKLT_FB 8.5v (at U7701 pin A5)
BKL_EN 2.73v
BKL_PWM 1.07v
The LCD connector was replaced earlier due to corrosion but the backlight was working (unstable) after that had been completed.
Very strange. I have no boost but it's not clear to me why. I would appreciate anyone's insight.
I've been working on an 820-00165, currently with no backlight. There is a picture on the screen. At an earlier date, the backlight was working but it would drop out regularly, and sometimes not come on at all. I replaced U7701 thinking it might be a corrosion issue, but it wasn't. I haven't been able to get the backlight to come on since even though the screen does activate and I can see a flashing folder when lit from the back.
I have confirmed after the U7701 replacement that I have the following:
PPVOUT_SW_LCDBKLT_FB 8.5v (at U7701 pin A5)
BKL_EN 2.73v
BKL_PWM 1.07v
The LCD connector was replaced earlier due to corrosion but the backlight was working (unstable) after that had been completed.
Very strange. I have no boost but it's not clear to me why. I would appreciate anyone's insight.
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