820-01700 No Backlight but has video

[Roshon]

No Backlight but has video
ppvout_so_lcdbklt_f is 39.5 Oms is this a short

 

[Roshon]

F8400: 12.62v
LCDBKLT_EN_L: 12V
PPVIN_S0SW_LCDBKLT_R: 12.62V
PP5V_G3S_BKLT_D: 5.1V
PP5V_G3S_BKLT_A: 5.1V
BKLT_EN_R: 0V

 

[Roshon]

PP5V_S0SW_LCD: 0V
PP3V3_S0SW_LCD: 0V
DP_INT_HPD: 0V

 

[Roshon]

do i have to test with a screen connected

 

[2informaticos]

Any history available?

"ppvout_so_lcdbklt_f is 39.5"
Is that with screen connected?

 

[Roshon]

no and no history available?

 

[Roshon]

i tried it with screen and get 41oms

 

[Roshon]

im not getting the 3v to turn on back light

 

[2informaticos]

You have short on backlight output.
I suspect one of the filter caps.

You can inject voltage, to find the culprit.
A previous visual inspection may also help.