Bouba148
New member
Hi 2Informaticos; team
No Backlight
Tested with another known good screen : same
Display works fine on an external TV through a thunderbolt hdmi adapter
LCD not detected
Backlight flashes once when hearing chime
SMC not talking to the LCD:
SMBUS_SMC_0_S0_SDA and SMBUS_SMC_0_S0_SCL solid 3.3V
DP_INT_HPD: 2.67V in diode mode 0.460V
checked all capacitors and resitances on the LCD path
EDP_PANEL_PWR: 3.318V and solid just after the chime
As I've noticed that NO green light and NO keyboard
So I've suspected the SMC
Reflowed the SMC: same
Checked the bios with the Medusa, all the different parameters are looking fine and doesn't make me think about an SPI issue
I was OUT of Idea; so I took the other issues under consideration first, then I decided to check and focus on the green light
So I've disconnected the flex LIO board:
Backlight came back as well as the keyboard. CRAZY
Replaced both flex and LIO board: same
So wondering about USB issue shooting down the others signals
Plugged an USB mouse on the Motherboard USB port with the Flex disconnected : NO Activity
So now should I focus more on the USB Level or more on J9500?
Best Regards
No Backlight
Tested with another known good screen : same
Display works fine on an external TV through a thunderbolt hdmi adapter
LCD not detected
Backlight flashes once when hearing chime
SMC not talking to the LCD:
SMBUS_SMC_0_S0_SDA and SMBUS_SMC_0_S0_SCL solid 3.3V
DP_INT_HPD: 2.67V in diode mode 0.460V
checked all capacitors and resitances on the LCD path
EDP_PANEL_PWR: 3.318V and solid just after the chime
As I've noticed that NO green light and NO keyboard
So I've suspected the SMC
Reflowed the SMC: same
Checked the bios with the Medusa, all the different parameters are looking fine and doesn't make me think about an SPI issue
I was OUT of Idea; so I took the other issues under consideration first, then I decided to check and focus on the green light
So I've disconnected the flex LIO board:
Backlight came back as well as the keyboard. CRAZY
Replaced both flex and LIO board: same
So wondering about USB issue shooting down the others signals
Plugged an USB mouse on the Motherboard USB port with the Flex disconnected : NO Activity
So now should I focus more on the USB Level or more on J9500?
Best Regards