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Brightness difference, DVI vs Component on KV34XBR910 |
rjih
Rank: Sony Buff
Joined: Jan 02, 2003
Posts: 23
From: Atlanta, GA
 |  Posted: 2005-06-03 08:52
I have noticed that when using the DVI input the displayed brightness of the picture is significantly higher than with component cables. The comparison was made using the DVI and component outputs on a Dish Network DVR921 and a LG LST4200A HD tuner. Different DVI and component cables were tested and the results were the same. There are no separate adjustments for DVI (Video7) and Component (Video 5 & 6) in the user menu.
Does anyone know if there is a separate adjustment in the service menu that would allow me to reduce the brightness only on the DVI input?
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andyross
Rank: Sony Legend
Joined: Mar 09, 2004
Posts: 1093
From: Schaumburg, IL
 | Posted: 2005-06-03 17:01
There are separate sub-adjustments in the service menu.
2170P-3/UBOF is brightness (black-level) and is separate for different video modes (480i, 480p, etc..), in addition to inputs (sorted RF, Vid1-4, Vid5-6, DVI, MemStick) It is further broken down by picture mode (Vivid, Standard, Movie, Pro). This is an 'offset' adjustment, allowing you to fine tune. It doesn't offer alot of adjustment. UCOF and UHOF are related Color and Hue offsets.
2170P-4/SPIC is Picture (white level) offset. It's only set per input as above (I think all 480i may use the same setting), not per video/picture mode. There is also SCOL and SHUE, which allow you to adjust color and hue per input, without all the super-fine tuning in 2170P-3.
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Sony KDL-46EX700, Onkyo TX-NR609, Sony BDP-S370, WDTV Live Streaming, Motorola DCT-6412, RCA RCRP05B.
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kentech
Rank: Sony Enthusiant
Joined: Mar 11, 2005
Posts: 45
From: Portland, OR
| Posted: 2005-06-03 20:58
On 2005-06-03 17:01, andyross wrote:
2170P-4/SPIC is Picture (white level) offset. It's only set per input as above (I think all 480i may use the same setting), not per video/picture mode. There is also SCOL and SHUE, which allow you to adjust color and hue per input, without all the super-fine tuning in 2170P-3.
rjih: by "brightness" I assume you mean the total picture brightness (what is varied by the Picture slider, not the Brightness slider), not just black level.
It seems to me that 2170P-4 #1 SPIC might be the best place to start, as it neatly isolates HDMI from other input sources (MS/Tuner, component, and DRC-processed sources). If the implication of its name is correct (sub-Picture), then it uniquely adjusts the video gain for that input, modifying the scope of the Picture slider. The brightness offset adjustment in 2170P-3 #13 UBOF shold be avoided unless it's the *black level* you wish to adjust; it doesn't affect Picture (how bright the whites are).
(Note: I haven't had to do this yet.)
Don't switch to a different input after making an SPIC change without first saving the setting, as you may lose the setting. That's usually what happens when you switch "columns" in the service-data table, here one column representing one input-type.
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KenTech
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rjih
Rank: Sony Buff
Joined: Jan 02, 2003
Posts: 23
From: Atlanta, GA
| Posted: 2005-06-04 09:40
Thanks for the information. I decreased 2170P-3/UBOF from 1 to 0 and increased 2170P-4/SPIC from 7 to 10.
There was an ISF calibration done on the set shortly after purhase. At the time all of my devices used component connections and those are the inputs the technician used for the calibration. I wonder if that is what created the disparity between Component and DVI.
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jehill
Premium Member
Rank: Sony Senior Advisor
Joined: Mar 13, 2003
Posts: 13792
From: Sewell, NJ
 | Posted: 2005-06-04 14:38
That would be a resonable assumption.
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-John
Sony A/V System: KDL-55XBR8, BDP-S550, AVD-C700ES Super Audio CD/DVD Receiver, 4 SS-LA500ED surround speakers, 1 SS-LAC505ED center channel speaker and 1 SA-WD200 Active Subwoofer
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SummitHDTV
Rank: Sony Enthusiant
Joined: Feb 26, 2005
Posts: 27
From: Southeast Michigan
| Posted: 2005-06-04 21:27
On 2005-06-04 09:40, rjih wrote:
Thanks for the information. I decreased 2170P-3/UBOF from 1 to 0 and increased 2170P-4/SPIC from 7 to 10.
There was an ISF calibration done on the set shortly after purhase. At the time all of my devices used component connections and those are the inputs the technician used for the calibration. I wonder if that is what created the disparity between Component and DVI.
Since you were only using component video at the time of the ISF calibation, the tech likely didn't calibrate the DVI input. The disparity was created OOB by Sony. It's knowledgeable users and ISF Techs that calibrate all the used inputs.
Although I own a different Sony set, there was a huge difference in the user controls (brightness, contast, color, etc) between component video and DVI.
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Summit HDTV
Virtual Business Card
ISF Trained
CA-6X color analyzer
VP-403 HD generator
TVS Pro optical comparator
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