820-00165 No blacklight and NO IMAGE

[Neil250]

Machine boot and works fine on external monitor
No water damage
J83000 looks good
F7700 is good (conitinous)


BKL_EN at R7731 is 0V


Q7706
PIN 4: 8.59V
PIN 3: 8.35V

Q7707
PIN: 2: 3.33V
PIN 5: 0 V

XW7720
No continuity between:
PPVOUT_SW_LCDBLKT_FB test point and D7701 PIN 2 ??? open switch

No continuity between U7701 A5 Ball and L7701 PIN 1: ???again points to switch

L7701 PIN 2 is 0V


Diode to ground L7701 PIN 1: 0.44V

nOW i DEBATING WHETHER TO REPLACE u7701 VS XW7720

 

[2informaticos]

"No continuity between U7701 A5 Ball and L7701 PIN 1: ???again points to switch"
Please, pay more atention to schematic.

"PPVOUT_SW_LCDBLKT_FB test point and D7701 PIN 2 ??? open switch"
Fix the broken trace issue.
But first step is to get BKL_EN; EDP_BKLT_EN is required.
Do you get image on internal LCD?

 

[Neil250]

YES Image is present and boots to desktop

 

[2informaticos]

Is not like stated on the title.
Please clarify if image is present on internal LCD (not external video).

 

[Neil250]

Ok informaticos

Problem solved.
Image was present on internal LCD (my error on the title)

XW7720 was the issue.
Bridged the broken trave.
LCD works now.




Its not pretty but it works.
Conformal coating next to protect it but it is secure.