no lcd - no lcd_pwr_en, no backlight - no lcd_bklt_en
yesterday i started working on Macbook Pro 15" 2013 with board number 820-3332-A with no backlight / no display issue.
This motherboard has already been repaired by somebody before. I checked every component and LCD / BKLT line and found missing LCD_PWR_EN and LCD_BKLT_EN. When i inject 3,4V to LCD_BKLT_EN, lcd backlight work but here is no image.
I tried reball U9100 but same problem.
LCD_PWR_EN resistance -> 0.615
LCD_BKLT_EN resistance -> 0.590
My queston is how to test U9100 (MCU???) or have somebody same problem? Thanks for your answer !