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Mac mini 2010 / flickering display on Samsung 206BW

7451 Views 9 Replies Latest reply: Mar 30, 2012 1:38 AM by andy7panda RSS
cjed Level 1 Level 1 (0 points)
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Aug 14, 2010 4:45 AM
Hi,
My new mac mini 2010 produces flickering image on my Samsung SyncMaster 206BW monitor (plugged using the provided HDMI to DVI adapter) : it isn't obvious overall, however it especially shows on some dark gray colors. It's like an old CRT monitor with too low refresh rate. It was ok with my previous mac (G4 MDD) on the same monitor, whatever refresh rate (60 and 70Hz).

Snow Leopard only allows 60Hz on the mac mini (should be ok as it isn't CRT), and I'm not confident using 3rd party utilities to try to add 70Hz option (some have experienced stability issues or out of range - that requires rebooting in safe mode).

I plugged the power cord on another plug, and also put the LCD display farther, to check for interference problem, however it didn't help.

Is this a defect with the Nvidia 320M chipset ?

thanks

Message was edited by: cjed
Mac Mini 2010, Mac OS X (10.6.4), 2,4 Ghz Core2 Duo ,4 Go ram
  • BSteely Level 5 Level 5 (7,635 points)
    Currently Being Moderated
    Aug 17, 2010 9:38 PM (in response to cjed)
    It could very well be that you are just seeing the FRC conversion taking place in the monitor to go from 8-bit video to 6-bit plus 2-bit FRC (the panel is likely 6-bit). You should try finding a real 8-bit display. The problem will likely be gone when connected to one of those.
  • BSteely Level 5 Level 5 (7,635 points)
    Currently Being Moderated
    Aug 19, 2010 9:59 PM (in response to cjed)
    About why you may not see flickering on gray in Safari on your website, it could be that particular gray level is one that can be achieved directly by 6-bits. In that case no dithering is taking place. So it may have nothing to do with Safari. It could just be the magnitude of the gray level chosen is not a level requiring 8-bit drive.
  • Danington Calculating status...
    Currently Being Moderated
    Jul 30, 2011 8:06 AM (in response to cjed)

    I have the 2011 Mac Mini server and have the same problem. It's connected to my Dell U2410 and the display flickers as if it were refreshing at 50Hz or something. I've tried connecting via HDMI and Thunderbolt (through to DVI adapter).

    I also have a PC connected to this screen and the display is rock solid... I suspect a driver could resolve this, until then I'll just keep the paracetamol nearby I guess

  • andy7panda Calculating status...
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    Mar 30, 2012 1:38 AM (in response to cjed)

    I have experienced the same problem connecting Samsung SyncMaster B2230 display to a Hackintosh with nVidia GTX 460SE via DVI-DVI cable, some particular shades of gray visibly flicker depending on the horizontal view angle, the lower I bend the better I see it. When I connect the same display to Mac Book Pro 13" – the problem vanishes. I'm on 10.7.3

    Any other ideas or workarounds? I have lost my DVI-to-VGA adapter so I can't try one you have provided in this thread.

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