820-2936 black screen w/backlight but chimes

[maazkamani]

820-2936 chimes but stays on black screen. check new screen, bios, checked pins on lvds and l9080. nothing works

thoughts? TIA

 

[dukefawks]

First put back original BIOS!

Diode mode on pins 4,6,7 with and without LCD connected.
SMC_LID high?

 

[maazkamani]

with plugged in

4 0.37

6 0.47

7 0.52


without plugged in

4 0.32

6 0.55

7 0.56

smc_lid is 3.3v and 0.54 diode

 

[dukefawks]

Is there 3V on C9015, LCD connected of course.

 

[maazkamani]

yes it is!

 

[dukefawks]

Then there must me backlight or some sort of image. Measure all LVDS lines on diode mode at the LVDS connector, LCD disconnected.

 

[maazkamani]

there is backlight. no image though

 

[maazkamani]

sorry i wasnt clear on that

 

[dukefawks]

Answer the rest of my questions.

 

[maazkamani]

1 0
2 0.54
3 0.54
4 0.32
5 oL
6 0.56
7 0.56
8 0.55
9 0.55
10 0
11 0.55
12 0.55
13 0
14 0.55
15 0.55
16 0
17 0.55
18 0.55
19 0
20 0L
21 0.56
22 0.56
23 0L
24 0.6
25 0.6
26 0.6
27 0.6
28 0.6
29 0.6
30 0

 

[dukefawks]

If those values are without an LCD connected then it is either a bad LCD/LCD cable or connector.