Asus vz239h-w no display

[tmhobadcap]

When I turn on the monitor, the screen does not light up. But when I shine light on screen, the ASUS LOGO image can be seen. But after a few seconds, the logo disappears and the power light turns orange which means standby.

I have checked backlight leds, they are all working. That means not backlight led problem. In other words, there is power to the backlight leds.

I found that when turned on, there is no voltage on all capacitors. So I suspect that something wrong with the chips. I started with the two chips closest to the power input, the one with the markings of "P8019 CDB9K" and "YVBJA". But I could not find any information from the internet. Could somebody please help me to find the information/datasheet on these two chips?

Of course, any suggestions on how to fix this monitor will be welcomed.

[Lisa Su]

Re: Asus vz239h-w no display

YVBJA = SY8366QNC
P8019 CDB9K = APA2604CQAI

Will attach schematics later, keep getting "VZ239.zip:
Upload of file failed. "

[Lisa Su]

Re: Asus vz239h-w no display

Schematics

[tmhobadcap]

Re: Asus vz239h-w no display

Thanks a lot Lisa Su.

[tmhobadcap]

Re: Asus vz239h-w no display

Sorry, I made a mistake. I mentioned that there were no voltages on all capacitors after turning on the monitor. That is incorrect. I just found that the power plug is loose making no contact at certain angle and so I could not get any voltage. But the no display problem and other founding are still true.
I am now trying to check which components might be defective by following the service manual provided by Lisa Su.