I have a 820-2850 board that doesn't display an image (checked with a flashlight from the back). Backlight also doesn't work.
There was liquid damage on the LCD connector, replaced connector, but still no image. Currently don't have a mini-displayport convertor, so can't check image externally.
Device seems to boot, since I hear the chimes and PPVCORE_S0_CPU is present.
SMC_LID = 3.4V
PPVCORE_S0_CPU = 1.38V
PPVOUT_S0_LCDBKLT is not present (no short), BKLT_EN is also not present. Traced this down to LCD_BKLT_EN which is not present. Since LCD_BKLT_EN comes from U9600, I've reach a dead end here.
So it's not being told to turn on the LCD/backlight, while it is booted and the lid is open. Since I have limited experience with macbook repairs, I'm kind of at a dead end here. Where to look for next?
There was liquid damage on the LCD connector, replaced connector, but still no image. Currently don't have a mini-displayport convertor, so can't check image externally.
Device seems to boot, since I hear the chimes and PPVCORE_S0_CPU is present.
SMC_LID = 3.4V
PPVCORE_S0_CPU = 1.38V
PPVOUT_S0_LCDBKLT is not present (no short), BKLT_EN is also not present. Traced this down to LCD_BKLT_EN which is not present. Since LCD_BKLT_EN comes from U9600, I've reach a dead end here.
So it's not being told to turn on the LCD/backlight, while it is booted and the lid is open. Since I have limited experience with macbook repairs, I'm kind of at a dead end here. Where to look for next?