Asus X555LD Rev. 2.0 no screen on internal

[Conste]

Hello,

I have a problem with a X555LD motherboard with an BGA i3 and an NVIDIA GPU. It charges the battery, works fine, but doesn't show a picture on the internal screen.
Windows will also not recognize the panel.

PANEL VCC on LVDS is not present - what shall I measure next?

Regards,
Constantin

[Techtiger]

Re: Asus X555LD Rev. 2.0 no screen on internal

do you have the schematic

[Conste]

Re: Asus X555LD Rev. 2.0 no screen on internal

No, I just have the boardview for the board.

[ronelex]

Re: Asus X555LD Rev. 2.0 no screen on internal

I also receive this unit now ok external and no display on internal, i hope i can solve it

[Techtiger]

Re: Asus X555LD Rev. 2.0 no screen on internal

J4601 LVDS connector depends on the ver
Test
Pin 123 +LED VCC CAP C4602 C4627 L4607 (AC BAT)
PIN 37.38.39

[ronelex]

Re: Asus X555LD Rev. 2.0 no screen on internal

i tried to lift up this 2 coil but nothing happens, The Enable signal for ic U4503 is coming from the CPU

[Conste]

Re: Asus X555LD Rev. 2.0 no screen on internal

Pin 1,2 and 3 of J4502 - LVDS are 0v.

C4602 0v on both sides.

C4627 PIN1 1,08v and Pin2 0v.

L4607 is not available on Rev. 2.0.

Pin 37/37/39 of which part?

[ronelex]

Re: Asus X555LD Rev. 2.0 no screen on internal

that is the supply for the backlights on the pin of J4502

[Techtiger]

Re: Asus X555LD Rev. 2.0 no screen on internal

i tried to lift up this 2 coil but nothing happens, The Enable signal for ic U4503 is coming from the CPU

it' coming out from U7002 5leg pin1

[Techtiger]

Re: Asus X555LD Rev. 2.0 no screen on internal

Pin 1,2 and 3 of J4502 - LVDS are 0v.

C4602 0v on both sides.

C4627 PIN1 1,08v and Pin2 0v.

L4607 is not available on Rev. 2.0.

Pin 37/37/39 of which part?

J4601 LVDS connector depends on the ver

[Techtiger]

Re: Asus X555LD Rev. 2.0 no screen on internal

pin 1,2 and 3 of j4502 - lvds are 0v.

C4602 0v on both sides.

C4627 pin1 1,08v and pin2 0v.

L4607 is not available on rev. 2.0.

Pin 37/37/39 of which part?

j4502
pin 2.3
cap c4517 c4512 sl4504 r4530
pin 4 j4502

u45503 pin 5
c4550
rn4526 pin2.4
test voltage

[ronelex]

Re: Asus X555LD Rev. 2.0 no screen on internal

I finally solved. Just a missing supply in U4501 pin7 reset signal must have 3.3v

[Conste]

Re: Asus X555LD Rev. 2.0 no screen on internal

Did you just bridge it?

[ronelex]

Re: Asus X555LD Rev. 2.0 no screen on internal

yes there is a broken line from plt_rst line

[ronelex]

Re: Asus X555LD Rev. 2.0 no screen on internal

I got the idea from this post, I read here reading in U4501 pin7 3.3v but mine is 0v.
https://www.badcaps.net/forum/showth...t=72749&page=2

[Conste]

Re: Asus X555LD Rev. 2.0 no screen on internal

yes there is a broken line from plt_rst line

I have 3,3 v on PIN7 / SL4505

[Conste]

Re: Asus X555LD Rev. 2.0 no screen on internal

j4502
pin 2.3
cap c4517 c4512 sl4504 r4530
pin 4 j4502

u45503 pin 5
c4550
rn4526 pin2.4
test voltage

J4505 Pin 2,3 = 0V
C4517 0V on both
C4512 0V on both
SL 4504 0V
R4530 0V on both

U4503 Pin 5 3,225V
C4550 3,225V and 0V on Pin 2 (GND)
RN4526 3,225V

[Techtiger]

Re: Asus X555LD Rev. 2.0 no screen on internal

J4505 Pin 2,3 = 0V
C4517 0V on both
C4512 0V on both
SL 4504 0V
R4530 0V on both

U4503 Pin 5 3,225V
C4550 3,225V and 0V on Pin 2 (GND)
RN4526 3,225V

ok lets stars from 0 whats is your LVDS connector number J4503 or J45__ ?

[Conste]

Re: Asus X555LD Rev. 2.0 no screen on internal

It is called J4502

[Techtiger]

Re: Asus X555LD Rev. 2.0 no screen on internal

voltage in
pin 2.3.4.21.27.36.38.39.40

one of this components short
C4517 0V on both
C4512 0V on both
SL 4504 0V
R4530 0V on both
test with out power resistance to gnd multimete