ASUS FA507NV-LP023W [brak obrazu na matrycy]

Asus
Model: FA507NV-LP023W
Płyta: DA0NJSMBAD0 REV: D
CPU: AMD Ryzen 7 7735HS
GPU: RTX4060
EC: IT5570VG-256/CX

Objaw:
Płyta uruchamia, się, reaguje na włącznik. Capslock działa, słychać w głośnikach, że system się uruchamia poprawnie. Brak obrazu zarówno na matrycy jak i po HDMI. Na złączu matrycy brakuje sygnału EDP_BRIGHT = 0V. +3VLCD_CON =3.3V, +VIN_BLIGHT=20V.

Pomiary na układzie UMX2:
UMX2
1 - 3.3v
2 - 0v
3 - 0v
4 - 0v
5 - 0v
6 - 0v
7 - 1.8v
8 - 3.2v
9 - 3.2v
10 - 0v
11 - 0v
12 - 3.2v
13 - 0v
14 - 3.3v
15 - 0v
16 - 0v
17 - 0V
18 - 1.14v
19 - 3.2v
20 - 0v

Pomiary na cewkach:
PL5 - 6.8ohm
PL 3, PL2, PL1, PL4 - 3.3ohm
PL700 - 520ohm
PL6101, PL6102, PL6103, PL6201, PL6202, PL6301,PL6000, PL6001- 1ohm
PL6501, PL6500, PL6503 - 29ohm
PL600 - 3,3kohm
PL900 - 322 ohm
PL3001 - 34kohm
pl3000 - mohm
PL4000 - 60kohm i rosnie
PL1000 - 1,5kohm

Hello!

Check that the voltages are present on all the coils.

PL4000 - 12v
PL1000 - 5v
PL1001 - 3.3v
PL3001 - 0v
PL900 - 1.1v
PL600 - 1.8v
PL5 - 1v
PL3, PL2, PL1, PL4 - 1.45v
PL700 - 0,78v
PL6101, PL6102, PL6103, PL6201, PL6202, PL6301, PL6001 - 0,75v
PL6501, PL6500, PL6503 - 1,25v

Set your multimeter to the diode test mode and measure the voltage drops to ground on pins 2, 3, 4, 5, 6, 10, 13, 15, 16, 17, 20 of chip UMX2 with the internal matrix connected to the board. Measure with the positive (red probe) connected to the ground.

2 - 0,5v
3 -0,5v
4 - 0.5v
5 -0,41v
6- 0,42v
10 - 0,5v
13 - 0,59v
15 - 0,59v
16 - 0,54v
17 - 0,56v
20- 0,59v

Inna matryca lcd również przetestowana i efekt ten sam. Podejrzewam EC, bo to on wysyła sygnał EC_DISPON, jego stan wynosi 0V.

Since neither the internal nor the external monitor is working, the GPU chip may be damaged.
Just in case, try to reflash the BIOS chip first.

Bios reflashed with 3 different Bios. Same story.

- Use an oscilloscope to measure the voltages to ground on pin 1 of resistors VR5168, VR5169 when the machine is turned on.

- Also use an oscilloscope to measure the voltages to ground on pins 1, 2, 5, 6 of VBIOS chip UV3. Take the measurements without the hard drive connected. Just check, if you get any pulses immediately after pressing to the power button. You will need to turn on the machine several times, to take the measurements.

try to reball the SIO chip, i encountered same issue.