AOC SW919-1 No power

[rhodesjo]

AOC monitor will not power on. I think (based on the brown scorch mark) that maybe this capacitor C912 blew. Does anyone know if replacing it may fix my issue? I am very new to this, and so before I venture down that road and order a capacitor I'd like to have an idea of if this will work. My fear is that once it blew other parts may have been damaged.


Any help is greatly appreciated. Thank you!

[dick_barton]

Re: AOC SW919-1 No power

AOC monitor will not power on. I think (based on the brown scorch mark) that maybe this capacitor C912 blew. Does anyone know if replacing it may fix my issue? I am very new to this, and so before I venture down that road and order a capacitor I'd like to have an idea of if this will work. My fear is that once it blew other parts may have been damaged.


Any help is greatly appreciated. Thank you!

You need to replace C912 as you are correct in that it is damaged. If that does not cure the fault then you will need to carry out further checks.

[dick_barton]

Re: AOC SW919-1 No power

It's quite brown around that area. Are there any components underneath the board at that point. If not I would freshly solder all the transformer pins. Something looks as though it has got hot.

[budm]

Re: AOC SW919-1 No power

Need to check the SMD Power MOSFETs (they drive the inverter transfoemr) on the bottom side of the board where the dark brown area is.

[rhodesjo]

Re: AOC SW919-1 No power

This is the back of the board. Just to the right of my finger is the back of the capacitor I replaced, mentioned in my original post (notice my poor snip of the wires). The capacitor replacement did not fix the issue by the way. The monitor does not turn on.

Again, thanks to everyone who's replied so far!

[budm]

Re: AOC SW919-1 No power

It looks like the legs of the new cap were not trimmed, were they bent over due to them touching the chassis?
If you run the power supply board by itself, what are the DCVs between the two legs of the capacitors you replaced?
What is the DCV between the two legs of C829?
Also need the resistance reading between the two leg of C829

[rhodesjo]

Re: AOC SW919-1 No power

It looks like the legs of the new cap were not trimmed, were they bent over due to them touching the chassis?
If you run the power supply board by itself, what are the DCVs between the two legs of the capacitors you replaced?
What is the DCV between the two legs of C829?

I actually bent them down like that to avoid any possible contact. I didn't have my good snippers handy and couldn't get any closer.

As for the DCV, I have this multi-meter (attached). Forgive my ignorance, should the monitor be plugged in when I test and also which setting should I have the meter on?

[budm]

Re: AOC SW919-1 No power

Set to DCV 20V scale.
Yes the board will have to be plugged into an AC outlet and you do not need to have any boards connected to the power supply board, the Voltage should be on the caps because the power supply is an always on power supply.
To be safe you should plug the power cord to a GFCI outlet in case you accidentally touch the hot side of the board.
BUT if you are not sure what you are doing then you should not be working on it, a mistake can kill you.

[ReeceyBurger123]

Re: AOC SW919-1 No power

Thats not a factory job, looks like someone bodged it it also its different to tbe rest of the caps.

[rhodesjo]

Re: AOC SW919-1 No power

Thats not a factory job, looks like someone bodged it it also its different to tbe rest of the caps.

yeah my soldering job isn't the greatest. I replaced the cap mentioned in the first few posts.

[rhodesjo]

Re: AOC SW919-1 No power

It looks like the legs of the new cap were not trimmed, were they bent over due to them touching the chassis?
If you run the power supply board by itself, what are the DCVs between the two legs of the capacitors you replaced?
What is the DCV between the two legs of C829?
Also need the resistance reading between the two leg of C829

I tested both capacitors with the power running to the board. I received 0.00 as the reading on both, with the meter set to 20v DCV.

[budm]

Re: AOC SW919-1 No power

How about the resistance reading between the two legs of c829?

[budm]

Re: AOC SW919-1 No power

BTW, you did do some simple test on component such as the main AC fuse and measured the DCV between the two legs of the main filter cap, right?

[rhodesjo]

Re: AOC SW919-1 No power

BTW, you did do some simple test on component such as the main AC fuse and measured the DCV between the two legs of the main filter cap, right?

No actually I haven't done either, I'm a novice with monitors. Would you be willing to explain either? I'd love to learn more.

Also, I tested both Caps and neither returned a reading on my meter.