Acer XF240Y display backlight on and off then stays on but no display

[dbuergi]

Hi all,

my display shows some strange bevahior. The backlight turns on, off and then stays on but i get no display or Acers logo. After some time it goes into standby. My notebook identifys the screen when i connect it by HDMI but i don't get an image.
Voltages seem normal and the only possible problem i found is the cap on C33 on the tcom board. It shows 0 Ohm and 0V in diode testing. Any ideas for next steps or what i can check?

[lotas]

This is not a capacitor, but a resistor R622, with zero resistance (jumper).

[dbuergi]

Ah okay sorry but your drawing makes it clear. So i didn't find the fault. Do you have any idea what to check?

This is the first time i work on a display so i apologize for my questions. I measured some spots again and found
C837 with 370 Ohm
C864 with 3k Ohm
C831 with 3k Ohm
This time caps for sure. C837 seems to be too low but i didn't find a data sheet of the Himax 8885-D TCON so i don't know the function of the pin connected to the cap.

[dbuergi]

Update with new news. I check all Connections, voltages and also removed the caps for tests. Everything looks good.
I tried a MacBook and desktop PC with HDMI connection and both recognize the monitor without a picture.
I watched some videos and checked different boards and think that one of the ICs on the tcon board IS the problem but i don't know where to start. :/

[dbuergi]

I hope i don't get on anyones nerves but i found shorted fuse....dunno why i missed this one. I replaced it but now the backlight stopped working. Maybe i got a chain reaction or something else is the problem. My thermal cam shows two chips getting around 60c when i plug the power supply in. On my first pic it is a mosfet i i am not wrong and on the second pic it is the chip next to the fuse. Any ideas what this is? D9 could mean diode but normaly they don't die but protect the circuit If i'm not wrong.
So next step would be to identify the chips and change them?
Update: Power board without tcon board connected works fine so the "mosfet" should not be the problem.

[dbuergi]

Display is working! I had to change the fuse and protection diode and now everything is fine.

[Witamina]

Hello
I have the same problem with the same monitor, but I can't identify what kind of diode it is and where I could buy/obtain one. Could you tell me what kind of diode it is???? Thanks in advance and best regards