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Samsung 204b 20" LCD blinking on DVI 1600*1200 - Analog
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endeval



Joined: 18 Oct 2006
Posts: 8

PostPosted: Thu Oct 19, 2006 2:06 pm    Post subject: Samsung 204b 20" LCD blinking on DVI 1600*1200 - Analog Reply with quote

Hi all
I hope someone can help me please. Sad

I have a GeForce 68000 Ultra and bought a Samsung 20" LCD

Native res is 1600*1200 @60Hz +/+ polarity.
Using Analog connection, no problems
Using DVI at 1600*1200 - monitor flickers on and off
Using DVI at 1280*1024 - no problems

I used pstrip customer res from EDID, and my own custom res, same issue...
Tried every single nVidia driver under the sun, same issue Sad


Many thanks in advance.

James.


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endeval



Joined: 18 Oct 2006
Posts: 8

PostPosted: Thu Oct 19, 2006 4:44 pm    Post subject: Reply with quote

Here is the moninfo while connected as analog.

I keep thinking the EDID info the monitor is throwing the Card is corrupt or wrong?!?!?

Monitor
Windows description......... SyncMaster 204T/204Ts/204B,SyncMaster Magic CX201Ts(Analog)
Manufacturer description.... SyncMaster
Manufacturer................ Samsung
覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Plug and Play ID............ SAM01AD
Serial number............... HSHL800048
EDID data source............ I2C bus (real-time)
覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Manufacture date............ 2006, ISO week 32
EDID revision............... 1.3
Display type and signal..... Analog 0.700,0.300 (1.0V p-p)
Sync input support.......... Separate, Composite, Sync on green
Screen size................. 410 x 310 mm (~22")
Power management............ Active off/sleep

Color characteristics
Display gamma............... 2.20
Red chromaticity............ Rx 0.640 - Ry 0.330
Green chromaticity.......... Gx 0.300 - Gy 0.600
Blue chromaticity........... Bx 0.150 - By 0.060
White point (default)....... Wx 0.313 - Wy 0.329

Timing characteristics
VESA GTF support............ Not supported
Horizontal scan range....... 30-81kHz
Vertical scan range......... 56-75Hz
Video bandwidth............. 170MHz
Extension blocks............ n/a
Timing recommendation #1.... 1600x1200 at 60Hz
Modeline................ "1600x1200" 162.000 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync

Standard timings supported
640 x 480 at 60Hz - IBM VGA
640 x 480 at 67Hz - Mac II
640 x 480 at 72Hz - VESA
640 x 480 at 75Hz - VESA
720 x 400 at 70Hz - IBM VGA
800 x 600 at 56Hz - VESA
800 x 600 at 60Hz - VESA
800 x 600 at 72Hz - VESA
800 x 600 at 75Hz - VESA
832 x 624 at 75Hz - Mac II
1024 x 768 at 60Hz - VESA
1024 x 768 at 70Hz - VESA
1024 x 768 at 75Hz - VESA
1152 x 864 at 75Hz - VESA
1152 x 870 at 75Hz - Mac II
1280 x 960 at 60Hz - VESA
1280 x 1024 at 60Hz - VESA
1280 x 1024 at 75Hz - VESA
1600 x 1200 at 60Hz - Samsung
1600 x 1200 at 60Hz - VESA

Raw EDID base
00: 00 FF FF FF FF FF FF 00 4C 2D AD 01 30 32 52 42
10: 20 10 01 03 0E 29 1F 78 2A EE 95 A3 54 4C 99 26
20: 0F 50 54 BF EF 80 A9 40 81 80 81 40 71 4F 01 01
30: 01 01 01 01 01 01 48 3F 40 30 62 B0 32 40 40 C0
40: 13 00 98 32 11 00 00 1E 00 00 00 FD 00 38 4B 1E
50: 51 11 00 0A 20 20 20 20 20 20 00 00 00 FC 00 53
60: 79 6E 63 4D 61 73 74 65 72 0A 20 20 00 00 00 FF
70: 00 48 53 48 4C 38 30 30 30 34 38 0A 20 20 00 98

Display adapter
Adapter description......... NVIDIA GeForce 6800 Series GPU
Adapter device ID........... 0x00F910DE
Display settings............ 1600x1200, 32bpp

User/computer information
Registered user name........ n/a
Registered organization..... n/a
Network user name........... James
Network computer name....... RACER
Windows version ............ Windows XP
Windows build .............. 5.01.2600 Service Pack 2
Installation date .......... 29/07/2004 12:00:00


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Rik Wang
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Joined: 13 Sep 2003
Posts: 8429

PostPosted: Fri Oct 20, 2006 2:34 pm    Post subject: Reply with quote

That is the analog EDID your MonInfo report is showing. The digital EDID will be different.

One thing to be aware of: the analog EDID is asking for 162MHz of video bandwidth to display 1600x1200, and the max for a single link DVI connection is 165MHz.

You should post the didgital EDID report from MonInfo...



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endeval



Joined: 18 Oct 2006
Posts: 8

PostPosted: Fri Oct 20, 2006 6:35 pm    Post subject: Reply with quote

Thanks Rik.

This is it (I didnt reboot, I just reconnected the DVI cable).


It may be coincidence, but it seems the screen flashes alot of more when white or bright objects, eg windows are open. I have a dark background.

Many thanks in advance
James.

Monitor
Windows description......... SyncMaster 204T/204Ts/204B,SyncMaster Magic CX201Ts(Digital)
Manufacturer description.... SyncMaster
Manufacturer................ Samsung
覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Plug and Play ID............ SAM01AE
Serial number............... HSHL800048
EDID data source............ I2C bus (real-time)
覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Manufacture date............ 2006, ISO week 32
EDID revision............... 1.3
Display type and signal..... Digital
Sync input support.......... n/a
Screen size................. 410 x 310 mm (~22")
Power management............ Active off/sleep

Color characteristics
Display gamma............... 2.20
Red chromaticity............ Rx 0.640 - Ry 0.330
Green chromaticity.......... Gx 0.300 - Gy 0.600
Blue chromaticity........... Bx 0.150 - By 0.060
White point (default)....... Wx 0.313 - Wy 0.329

Timing characteristics
VESA GTF support............ Not supported
Horizontal scan range....... 30-81kHz
Vertical scan range......... 56-75Hz
Video bandwidth............. 170MHz
Extension blocks............ n/a
Timing recommendation #1.... 1600x1200 at 60Hz
Modeline................ "1600x1200" 162.000 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync

Standard timings supported
640 x 480 at 60Hz - IBM VGA
640 x 480 at 67Hz - Mac II
640 x 480 at 72Hz - VESA
640 x 480 at 75Hz - VESA
720 x 400 at 70Hz - IBM VGA
800 x 600 at 56Hz - VESA
800 x 600 at 60Hz - VESA
800 x 600 at 72Hz - VESA
800 x 600 at 75Hz - VESA
832 x 624 at 75Hz - Mac II
1024 x 768 at 60Hz - VESA
1024 x 768 at 70Hz - VESA
1024 x 768 at 75Hz - VESA
1152 x 864 at 75Hz - VESA
1152 x 870 at 75Hz - Mac II
1280 x 960 at 60Hz - VESA
1280 x 1024 at 60Hz - VESA
1280 x 1024 at 75Hz - VESA
1600 x 1200 at 60Hz - Samsung
1600 x 1200 at 60Hz - VESA

Raw EDID base
00: 00 FF FF FF FF FF FF 00 4C 2D AE 01 30 32 52 42
10: 20 10 01 03 80 29 1F 78 2A EE 95 A3 54 4C 99 26
20: 0F 50 54 BF EF 80 A9 40 81 80 81 40 71 4F 01 01
30: 01 01 01 01 01 01 48 3F 40 30 62 B0 32 40 40 C0
40: 13 00 98 32 11 00 00 1E 00 00 00 FD 00 38 4B 1E
50: 51 11 00 0A 20 20 20 20 20 20 00 00 00 FC 00 53
60: 79 6E 63 4D 61 73 74 65 72 0A 20 20 00 00 00 FF
70: 00 48 53 48 4C 38 30 30 30 34 38 0A 20 20 00 25

Display adapter
Adapter description......... NVIDIA GeForce 6800 Series GPU
Adapter device ID........... 0x00F910DE
Display settings............ 1600x1200, 32bpp

User/computer information
Registered user name........ n/a
Registered organization..... n/a
Network user name........... James
Network computer name....... RACER
Windows version ............ Windows XP
Windows build .............. 5.01.2600 Service Pack 2
Installation date .......... 29/07/2004 12:00:00


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endeval



Joined: 18 Oct 2006
Posts: 8

PostPosted: Fri Oct 20, 2006 6:37 pm    Post subject: Reply with quote

Wait a minute.....I just noticed something...

Screen size................. 410 x 310 mm (~22")

Its a 20inch, not a 22 inch ?!?!


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Rik Wang
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Joined: 13 Sep 2003
Posts: 8429

PostPosted: Fri Oct 20, 2006 6:43 pm    Post subject: Reply with quote

The size in inches is just an approximation made by MonInfo - the exact size is in mm.

As you can see, the bandwidth wanted for 1600x1200 is very close to the absolute maximum DVI supports, so that could be it. It could also be the cable (too long? cheap?), resulting in signal dissipation.

Finally, it could be - not your particular card - but NVidia's integrated TMDS itself, on the 6800.

The fact that it happens at 1600x1200 but not 1280xx1024 suggests its the extra bandwidth required...



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endeval



Joined: 18 Oct 2006
Posts: 8

PostPosted: Sat Oct 21, 2006 10:58 pm    Post subject: Reply with quote

Hi Rik,
Thanks for that.

I tried Samsung's own DVI cable shipped with the unit, which I would have hoped to be designed to be good enough for its own monitor. I also used a Belkin Pro cable and the results are effectively the same.

I had opened a call with nVidia and they said its a bad DVI port on the 6800 which I dont actually believe. Unless nVidia are trying to advoid admitting to poor TMDS chips in their 6xxx cards?

What is the max bandwidth of DVI ? 165mhz?

Many thanks


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romain



Joined: 23 Oct 2006
Posts: 1
Location: San Francisco Bay Area, USA

PostPosted: Mon Oct 23, 2006 3:29 am    Post subject: Reply with quote

I also have a blinking (or "flickering") SyncMaster 204B. The same computers (connected through a 4-way DVI KVM) worked just fine with a Dell 2001fp, but right now the ATI video boxes blink, and a box with an eVGA 6200LE is perfectly happy. Another forum has observed the same problem and apparently it's a product defect:
http://www.evga.com/community/messageboard/post.asp?method=TopicQuote&TOPIC_ID=19835&FORUM_ID=32.
(hope that URL works...)


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endeval



Joined: 18 Oct 2006
Posts: 8

PostPosted: Mon Oct 23, 2006 9:34 pm    Post subject: Reply with quote

Many thanks for the info Romain.


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endeval



Joined: 18 Oct 2006
Posts: 8

PostPosted: Mon Oct 23, 2006 9:39 pm    Post subject: Reply with quote

I have just noticed in the quick start guide for the monitor ;

Setting the veritcal frequency
The vertical frequency can be limited by the capacity of the system.
Recommended refresh rate: 60hz (if the maximum resolution is applied, set the vertical frequency at less than 60Hz.)


HUH? I am running the monitor at max res, 1600*1200. Can I set the vertical refresh less than 60Hz?


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Rik Wang
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Joined: 13 Sep 2003
Posts: 8429

PostPosted: Tue Oct 24, 2006 1:04 pm    Post subject: Reply with quote

Of course you can. PowerStrip menu > Display profiles > Configure > Advnaced timing options.



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endeval



Joined: 18 Oct 2006
Posts: 8

PostPosted: Wed Oct 25, 2006 4:58 pm    Post subject: Reply with quote

Thanks Rik.

I set
Horizontal Scan rate 70Hz
Vertical Refresh rate 56Hz

Leading to a Pixel clock of 151.200Mhz.

This has vastly improved matters when using DVI. The monitor only blinks about once every 3/4 minutes.

I would still think its a Samsug issue, no?


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Rik Wang
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PostPosted: Wed Oct 25, 2006 7:55 pm    Post subject: Reply with quote

I would be inclined to think its a 6800 DVI issue...



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domski



Joined: 15 Jan 2007
Posts: 3

PostPosted: Mon Jan 15, 2007 6:30 pm    Post subject: Samsung 204B flicker Reply with quote

I think this is a problem with the Samsung 204B monitor.

Running 1600x1200, using a DVI connection, the display switches on and off at random, and I get intermittent "not recommended mode" warnings.

I am using completely different software and hardware. I'm running Linux, and have tried two different video cards, different DVI cables, different monitors (I have two screens and get the same problem with whichever screen I connect to with the DVI cable).

XOX DOM


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domski



Joined: 15 Jan 2007
Posts: 3

PostPosted: Mon Jan 15, 2007 6:33 pm    Post subject: Samsung 204B flicker Reply with quote

I think this is a problem with the Samsung 204B monitor.

Running 1600x1200, using a DVI connection, the display switches on and off at random, and I get intermittent "not recommended mode" warnings.

I am using completely different software and hardware. I'm running Linux, and have tried two different video cards, different DVI cables, different monitors (I have two screens and get the same problem with whichever screen I connect to with the DVI cable).

XOX DOM


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