LG LC550WUD flickering picture

[tryingtofix]

I have an LG LC550WUD which looks like it's an industrial open frame monitor. It just has VGA and DVI inputs, no tuner or HDMI.

The picture has a problem which is difficult to explain, it looks like it jumps or flickers. Here is a YouTube video showing it:
https://youtu.be/jhpLEZYYBAM?t=1m53s

There are six PCBs behind the panel. I have changed all the electrolytic capacitors on the large main PCB, but that didn't make any difference. It looks like it would be very difficult to change the capacitors on the other PCBs.

I would appreciate any hints what could be wrong! I can post pictures of all the PCBs if that can help.

[dskall]

Re: LG LC550WUD flickering picture

I would be wiggling cables and connections. Tapping boards to see if it affects picture

[tryingtofix]

Re: LG LC550WUD flickering picture

Thank you! I will try that. I disconnected most of the connectors when I replaced the capacitors on the main board, though.

[dskall]

Re: LG LC550WUD flickering picture

Especially around t-con

[tryingtofix]

Re: LG LC550WUD flickering picture

Thanks! I'll let you know how it goes.