HP OLED_EN Signal Missing 13-AW2007TU -DAX3ACMBAF0

[sikocan]

Hi all, I need help on this case, I'd appreciate your time.

Images for your reference are here:
https://photos.app.goo.gl/dnpX1WMTgwE6aAq87

History: Laptop comes in with no picture or backlight.
Technician installs new screen, same issue. They tried 2 screens, same issue.
It has come to me and I can see they only probed the fuse with multi-meter.

As per attached schematics, I did some measurements for your reference.

SM3201 Pins
1 0
2 0
3 4.68
4 17.59
5 17.59
6 17.59
7
8 5.59
9
10
11
12
13
14
15
16
17
18
19
20
21 5.51
22
23
24 5.49
25
26
27
28
29
30
31 17.59
32 4.49
33
34
35
36

DIODES TEST:
PD9203 BLACK ON ANODE - RED ON CATHODE 0.38V DROP
PD9203 RED ON ANODE - BLACK ON CATHODE 0.10V DROP
PD9202 SAME READING

PQ9201 FDMC8032L REPLACED WITH SAME MODEL. in circuit measurements
Resistance readings:
G1 > S1 18ohms (Low isn't?)
G1 > D1 9.27M
S1 > D1 8.6M

G2 > S2 18ohms (Low isn't?)
G2 > D2 7.17M
S2 > D2 6.82M

SM3201A REPLACED WITH SM3201 DA1935 SMMS013
ORIGINAL CHIP LABELLED SM3201A DA2027 SMPB00

SM3201 Pins
1 0
2 0
3 4.68
4 17.59
5 17.59
6 17.59
7
8 5.59
9
10
11
12
13
14
15
16
17
18
19
20
21 5.51
22
23
24 5.49
25
26
27
28
29
30
31 17.59
32 4.49
33
34
35
36


LVDS CONNECTOR
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
10 0
11 0
12 0
13 0
14 0
15 0
16 0
17 0
18 0
19 0.08
20 0.04
21 0.04
22 3.28
23 3.28
24 0
25 3.28
26 3.28
27 3.28
28 3.28
29 3.28
30 3.28
31 0
32 3.28
33 3.28
34 0
35 0
36 0
37 0
38 0
39 0
40 0
(Pin 39/40 Resistance to ground 30M+)

Schematic: https://www.badcaps.net/forum/showth...75#post1243675

[sikocan]

Re: HP OLED_EN Signal Missing 13-AW2007TU -DAX3ACMBAF0

I hope someone can shed some light on as to what's going on here.

When the LCD is not connected, the Pin 14 of the SM3201A is not grounded. When the LCD is connected, it's grounded. This is an OLED model so there is no cap at PC9223, but PR9206 exists. It's 0 ohms. So when LCD is connected, it's grounded. I've checked the cable, continuity is good all the way on either side, no short, not touching ground. I've checked the Pin 8 of the LCD and it's grounded, same with another screen. To me this says the PMIC SM3201A knows there is a screen connected, is this correct?

There is no datasheet for this chip. I don't have picture or backlight. Damn. Any tips?

[JaroTech]

Re: HP OLED_EN Signal Missing 13-AW2007TU -DAX3ACMBAF0

Hi, on the CN3401 connector, check if you have the voltages on it.

[Sephir0th]

Re: HP OLED_EN Signal Missing 13-AW2007TU -DAX3ACMBAF0

The device completes the P.O.S.T. for sure?

[sikocan]

Re: HP OLED_EN Signal Missing 13-AW2007TU -DAX3ACMBAF0

Yes, it boots to Windows external screen.

[sikocan]

Re: HP OLED_EN Signal Missing 13-AW2007TU -DAX3ACMBAF0

Yes I've checked CN3401 area - no Voltages. Drives me crazy. A new screen arrived today. Same issue. I wonder if I replaced it with wrong chip, maybe SM3201A and SM3201 are different chip.