Bouba148
New member
Hi Team,
This machines starts, chimes but no display on internal or external screen.
Checked and noticed that F9700 was blown, so I replaced it, after what PPBUS_S0_LCDBKLT_FUSED was present but still no backlight display.
LCD_BKLT_EN: 0V
disconnected the screen at J9000 and tested again on external screen: OK
Tried another 2013 retina LCD Screen: NOK
reflowed U9100:
LCD_BKLT_EN: 3.3V OK
now with the LCD connected PPBUS_S0_LCDBKLT_FUSED jumping between 1.8V to 3.0V, if LCD not connected it stays solid 12.50V
PP5VR3V3_SW_LCD at L9000: 5.0V
If I put a torch light on the LCD, I DO have a Display/Image.
Should I suspect u9701?
This machines starts, chimes but no display on internal or external screen.
Checked and noticed that F9700 was blown, so I replaced it, after what PPBUS_S0_LCDBKLT_FUSED was present but still no backlight display.
LCD_BKLT_EN: 0V
disconnected the screen at J9000 and tested again on external screen: OK
Tried another 2013 retina LCD Screen: NOK
reflowed U9100:
LCD_BKLT_EN: 3.3V OK
now with the LCD connected PPBUS_S0_LCDBKLT_FUSED jumping between 1.8V to 3.0V, if LCD not connected it stays solid 12.50V
PP5VR3V3_SW_LCD at L9000: 5.0V
If I put a torch light on the LCD, I DO have a Display/Image.
Should I suspect u9701?