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Delicious2
Joined: 03 May 2008
Posts: 24
Location: MA
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| Posted: Tue Jun 17, 2008 6:23 pm Post subject: Fly in G90 ointment - Electrical Noise in picture |
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My (new to me) G90 calibrated by Ken Whitcomb has been a revelation in image quality (if not motion fidelity) for the last 10 days. One issue remains however which I didn't notice or wasn't yet happening when Ken was here last week. Electrical streaks of noise in the picture are distracting as hell. I"ll try to describe sans screenshot. On my HTPC output at 1080p 60Hz to a JohnW DVI card in the G90 I get consistent noisy electrical streaking throughout the picture. It is especially noticeable in dark scenes in the black bars top and bottom. Haven't tried it with my other source - a HD cable box also to same DVI card. I'll try that when I get home tonite. Not sure whats going on, it doesn't seem to matter what software I'm using to play movies - PowerDVD, Windows Media Player, ZoomPlayer. The pj is sitting on a rug on the floor without its feet - don't have any. Not sure if this is creating some sort of issue with grounding or static. Thought I'd try changing the outlet that the pj is plugged into. Possibly lefting the ground with a cheater on the theory that this is the visual equivalent of hum in an audio system. FWIW my audio had little or no hum. Not sure what else to try. I'm reluctant to move the G90 at all for fear that I'll mess up Ken's calibrations.
Ideas?
thanks,
Mark H
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Axatax
Joined: 01 Nov 2006
Posts: 403
TV/Projector: Sony VPH-G70Q (aka Barco Cine8 Onyx)
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| Posted: Tue Jun 17, 2008 6:28 pm Post subject: |
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| Quote: | | Haven't tried it with my other source - a HD cable box also to same DVI card. |
Are you using an NVidia card in the HTPC?
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Delicious2
Joined: 03 May 2008
Posts: 24
Location: MA
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| Posted: Tue Jun 17, 2008 6:42 pm Post subject: |
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| Axatax wrote: | | Quote: | | Haven't tried it with my other source - a HD cable box also to same DVI card. |
Are you using an NVidia card in the HTPC? |
An ATI Radeon.
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PaulB
Joined: 26 Oct 2007
Posts: 359
Location: Bonnie (but rainy) Scotland
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| Posted: Tue Jun 17, 2008 8:33 pm Post subject: |
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Couple of ideas Mark, try the HTPC on a monitor and see if the same interference is still there (unlikely but worth a try) - if it is then its the HTPC.
Also, my radio alarm clock causes similar issues on my Marquee, if the radio is on whilst the Marquee is running I see streaks in the picture, turn the radio off and all is well again! Try switching off any nearby electrical equipment, TV, radio, fish tank pump etc, etc and see if thats it. With luck its something simple.
Also try swapping cables, could be a badly shielded cable.
This is the sort of thing that Ken would have noticed when looking at your G90, likely the problem lies elsewhere and wasn't happening when Ken was there.
_________________
Paul
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Delicious2
Joined: 03 May 2008
Posts: 24
Location: MA
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| Posted: Tue Jun 17, 2008 8:52 pm Post subject: |
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Thanks Paul. These streaks don't appear on my Sony FW900 CRT monitor clone when the video card is driving both pj and monitor. Good suggestions on interference and cabling. I'll check it out and report back.
peace,
Mark H
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Delicious2
Joined: 03 May 2008
Posts: 24
Location: MA
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| Posted: Wed Jun 18, 2008 1:55 pm Post subject: |
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Didn't see any electrical noise/interference from the cable box using the same DVI cable.
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r.bauer
Joined: 08 Apr 2006
Posts: 280
Location: The Netherlands
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| Posted: Thu Jun 19, 2008 9:55 am Post subject: |
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How long is your DVI Cable? Sparks in black image area sound just like long DVI cable problems.
Try using a 6 ft cable and let us know.
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Delicious2
Joined: 03 May 2008
Posts: 24
Location: MA
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| Posted: Thu Jun 19, 2008 3:37 pm Post subject: |
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Thanks for the suggestion r.bauer. My current cable is a high quality Tributaries brand either 6' or 10' (I'll check it). Interestingly, I didn't see any electrical noise watching From Hell BluRay last night. This very dark film looked great (except the judder). I had updated and then switched back to an older version of PowerDVD last weekend (one that would allow me to play HDdvd and BluRay files from my hard drive) so that might be part of the difference too. I'll do some more checking tonite.
peace,
Mark H
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Delicious2
Joined: 03 May 2008
Posts: 24
Location: MA
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| Posted: Mon Jun 23, 2008 1:11 am Post subject: |
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The .wmv of The Matrix Trilogy played in MPC still show lots of electrical noise. Other movies like Man on Fire DTheater and From Hell Blu-Ray played in PowerDVD 7.03.3304 don't show any. More tests to come...
Mark H
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Mon Jun 23, 2008 6:05 am Post subject: |
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I wonder if it's a codec issue? Or as you say a powerDVD isue. Which ATi Radion card are you using?
_________________
Tech support for nothing
CRT.
HD done right!
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jmcmahon7
Joined: 03 May 2008
Posts: 18
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| Posted: Mon Jun 23, 2008 4:40 pm Post subject: |
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did you try it with a computer monitor yet? It could be artifacts from the graphics card, having not seen a picture/vid of whats hapening, its hard to say. Does it look like bolts of "black lightning?" If this is the case, heres some possible causes:
Old/crappy drivers (Very seldom the problem however)
Overheating GPU or RAM on the Graphics card.
Insufficient power being provided to the card
Graphics card thats simply on the way out.
Id definately echo the advice above, try a different display device and troubleshoot from there. If you could host a video of an example that would help too.
Some codecs/display methods are more dependant on CPU/GPU so it could be the ones pushing the GPU that are causing the issue.
HTH
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Delicious2
Joined: 03 May 2008
Posts: 24
Location: MA
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| Posted: Tue Jun 24, 2008 4:08 pm Post subject: |
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| AnalogRocks wrote: | | I wonder if it's a codec issue? Or as you say a powerDVD isue. Which ATi Radion card are you using? |
Radeon X1950 Pro PCI-e
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Delicious2
Joined: 03 May 2008
Posts: 24
Location: MA
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| Posted: Tue Jun 24, 2008 4:13 pm Post subject: |
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| jmcmahon7 wrote: | did you try it with a computer monitor yet? It could be artifacts from the graphics card, having not seen a picture/vid of whats hapening, its hard to say. Does it look like bolts of "black lightning?" If this is the case, heres some possible causes:
Old/crappy drivers (Very seldom the problem however)
Overheating GPU or RAM on the Graphics card.
Insufficient power being provided to the card
Graphics card thats simply on the way out.
Id definately echo the advice above, try a different display device and troubleshoot from there. If you could host a video of an example that would help too.
Some codecs/display methods are more dependant on CPU/GPU so it could be the ones pushing the GPU that are causing the issue.
HTH |
Thanks for the advice HTH. As noted above I didn't see any electrical interference/noise on the Sony FW900 clone CRT monitor being driven at the same time from this dual output video card. I'll do some more tests tonite.
Mark H
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Delicious2
Joined: 03 May 2008
Posts: 24
Location: MA
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| Posted: Mon Jun 30, 2008 2:30 am Post subject: |
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So far the noise seems confined to playback of .mkv files using Haali Media Splitter 1.7.189.11 with Media Player Classic 6.4.9.0 or Windows Media Player 11 or ZoomPlayer 4.51.
Mark H
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