820-4924 Black screen

dhz1nn

New member
I have a 820-4924 board, it turns on normally, but no display.

It displays image to an external monitor, but its own LCD remains black like it has not been plugged in the board.

L8300 at 5V without LCD plugged, and 0v with it.
C8320-C8328 on the place
EDP_PANEL_PWR missing
 

2informaticos

Administrator
Staff member
5V MUST appear in the first few seconds w/ or w/o LCD connected.
But will disappear fast if LCD is not connected.
Once LCD is correctly recognized by PCH, voltage is maintained.

Keep LCD connected, when diagnose image, or backlight problems.
Check if DP_INT_HPD goes high at same time with 5V on L8300.
If yes, post PPVOUT_S0_LCDBKLT voltage.
 

dhz1nn

New member
5.171V present at L8300 when LCD is connected.
DP_INT_HPD 0V with or without LCD connected.
PPVOUT_S0_LCDBKLT 49.39V
LCD_HPD_CONN - 0V as well
 
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