Samsung Syncmaster 244T screen goes crazy

[pixelphoto]

I recently replaced ALL caps except the largest cap on the ps board. Monitor works fine. Except through out the day, and this has been happening for over a year but becoming worse; out of nowhere the monitor screen goes haywire. The screen locks up and displays horizontal lines of mixed colors and sizes before the computer (Mac Mini late 2012) reboots. This occurs when the monitor and or computer are hot or cold.
I have been suspecting my neighbor(s) of RFI/EMI. Sometimes it happens when one of them comes home. Talking to them to see if they are turning on electrical appliances, etc is futile.
Any suggestions, advise would be greatly appreciated. I will soon replace the largest cap on the ps board.


Thanks,
Marvin

[selldoor]

Re: Samsung Syncmaster 244T screen goes crazy

Please update your profile with country and mains voltage.
What make series of caps did you use as replacements.
Can you test the monitor on another PC/input
Have you a second monitor/TV you can use to test the PC

[pixelphoto]

Re: Samsung Syncmaster 244T screen goes crazy

Replacement caps were Panasonic and Rubycon of a higher quality and lower ers than original caps. USA, 120VAC 60Hz.
No, I do not have another computer or monitor.

[budm]

Re: Samsung Syncmaster 244T screen goes crazy

"The screen locks up and displays horizontal lines of mixed colors and sizes before the computer (Mac Mini late 2012) reboots." How about trying with another computer, the monitor will not cause the computer to reboot or lock up.

[pixelphoto]

Re: Samsung Syncmaster 244T screen goes crazy

1

[pixelphoto]

Re: Samsung Syncmaster 244T screen goes crazy

https://www.badcaps.net/forum/attach...1&d=1435731463

[joshnz]

Re: Samsung Syncmaster 244T screen goes crazy

https://www.badcaps.net/forum/attach...1&d=1435731463

looks like video corruption something is wrong with your mac.

[diif]

Re: Samsung Syncmaster 244T screen goes crazy

Looks like logic board failure (BGA).

[pixelphoto]

Re: Samsung Syncmaster 244T screen goes crazy

Mystery solved! About eight months ago I decided to use my my Mac Mini as a music server. In a attempt to reduce vibrations and resonance I placed a 3.5" square box full of pennies on the Mac. Just last week I removed the pennies and disassembled the Mini to a degree to see if I could see if any fault was visible. I realized that the Mini being so packed with no room to spare that maybe the weight of the pennies was just enough to cause contact of parts after the Mini was warmed up. I reassembled the Mini and booted up and let the it warm up without the pennies sitting atop it. Well I haven't had a problem since. Isn't that interesting?