Monitor making weird noise when charging resolution or in standby mode

[Antony2023]

Hello, guys i need some help, i have an old fujitsu siemens LCD monitor, and is making weird noise when is changing resolution or in standby mode.

I open it up, to see if it is any hardware damage, but i only see 2 capacitors bulging on the logic board, i'll probably change them. On the power supply circuit board, only one thing caught my attention, the transformer seems to have leaked something out of it and the mess around it. Do you think there may be a problem here?

[kaboom]

Re: Monitor making weird noise when charging resolution or in standby mode

Hello, guys i need some help, i have an old fujitsu siemens LCD monitor, and is making weird noise when is changing resolution or in standby mode.

I open it up, to see if it is any hardware damage, but i only see 2 capacitors bulging on the logic board, i'll probably change them. On the power supply circuit board, only one thing caught my attention, the transformer seems to have leaked something out of it and the mess around it. Do you think there may be a problem here?

The transformer looks OK, just the varnish it's been dipped in.

I'd recap the power supply too.
And as much of the signal board- those can be difficult to remove, but tinning their leads with good leaded solder can make removal easier.

Good luck!

[CapLeaker]

Re: Monitor making weird noise when charging resolution or in standby mode

Don’t worry about that transformer, it came out of the factory like that.

[redwire]

Re: Monitor making weird noise when charging resolution or in standby mode

When the power supply caps croak, it stresses the ones on the logic board.
Just recap the PSU and those logic board caps.

[Antony2023]

Re: Monitor making weird noise when charging resolution or in standby mode

Thank you all for the quick response i will recap and see if it fix it.

[Antony2023]

Re: Monitor making weird noise when charging resolution or in standby mode

I managed to change the capacitors from the power supply board and from the logic board, and the weird noise is gone, but it was a pain in the ass, mostly because i have a cheap soldering iron from China, and it won't properly heat to melt the solder.

[R_J]

Re: Monitor making weird noise when charging resolution or in standby mode

I managed to change the capacitors from the power supply board and from the logic board, and the weird noise is gone, but it was a pain in the ass, mostly because i have a cheap soldering iron from China, and it won't properly heat to melt the solder.

Always add some fresh solder when de-soldering the parts, it will transfer the heat a lot better.