820-3115, no image on screen Black screen

yobad

Member
820-3115 has backlight and no image
working with an external screen
replaced j9000
PP3V3_LCDVDD_SW_F is present
 

2informaticos

Administrator
Staff member
Check L9080 first.
Next, check diode mode on all LVDS DATA lines to ground; w/ and w/o LCD connected.
Also try known good compatible screen.
 

yobad

Member
I tried new lcd always no image but some color is floating.

L9080 is fine 3.3v on both sides

Pin
6 .662
7 .664
8 .693
9 .695
11 .696
12 .695
14 .671
15 .644
17 .671
18 .644

??????
 

2informaticos

Administrator
Staff member
Did you try compatible screen for sure?
Can you explain "color floating"?
Compare diode mode readings w/ and w/o screen connected.
You can get some difference, but values should be similar on each pair.
 
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