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L22w-7sd edid checksum

Dvi port of l22w-7sd gives bad edid, the only problem with it is that name of monitor stored in edid has one character wrong (last D) and because of that checksum is wrong.. and cause monitor not being detected by linux (dmesg shows bad edid checksum) and windows and display doesn't get activated without doing some kind of hack for ignoring/faking edid. is there a way write correct edid back to monitor. I tried powerstrip and edid-rw on linxu.. but it seem eprom is read only.. any way to get monitor to service mode/make eprom rw?

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  • ivanoppulo Jan 20, 2013

    L22W-7SD is Fujitsu siemens monitor.

  • ivanoppulo Feb 05, 2013

    So I tried 2 different laptops and desktop (each having different graphic card) and various tools (powerstrip (win), edid-rw (linux) I could always read edid, but writing would fail. Finally I connected DVISVGA adapter to monitor and connected i2c pins to RaspberryPi and using "i2cdetect -y 0" I was able to get monitor i2c bus, and "i2cdump -y -r 0x00-0x7f 0 0x50" to dump edid, and finally "i2cset -y 0 0x50 0x78 0x44" to put "D" back where it should be in monitor edid.. evertything works now like it should.

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3 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

jhookcs
  • 4 Answers

SOURCE: Primary display issue

Hello,

Try going to Windows Safe Mode. You do this by pressing the F8 key repeatedly exactly after you hear your computer beep when it is rebooting. This should bring you to a screen that will have 3 Safe Modes listed, choose just plain Safe Mode by using your arrow keys to highlight Safe Mode and press enter. Once in Safe Mode, a box will come up asking you if you intended to enter Safe Mode, click Yes. You should now see your desktop, however it will look larger, and with less colors. This is normal.

If this mode did not allow you to get into windows, then reboot, press F8 like before and select Enable VGA Mode instead.

Now that you hopefully have a desktop, try this link which will take you to a video that will walk you through the process of setting up your DualView monitors. Also, note that there are some check boxes that allow you to select which monitor you want to be the primary.

I realize this video is specific Windows 2000, but the process is the same for Windows XP.

Hope this helps and Good luck!

Posted on Dec 23, 2007

  • 300 Answers

SOURCE: "No signal detected" when LCD connected with DVI-D Cable

Thank you for providing your configuration details.
You have failed to specify wheather or not your LCD Display is under Warrenty.

Perhaps these simple trouble shooting procedures will get the job done.

1. use the DVI to VGA adaptor that came with your card

Plug in a regular CRT monitor to the Primary Display Output Port using the DVI to VGA adaptor
( either port can be designated as the primary by you )
I like to use the Port nearest to the motherboard as the Primary

2. plug in the your LCD monitor on Secondary Display port using your DVI cable

At this point you should be able to see your desktop on the Primary CRT Display

3. Go to the display properties and use the Nvidia Dual Display Setup Wizard

set both desktops to CLONED at a resolution of 1024x768 and set the refresh to 60Hz
which is default for most LCD displays , some have higher refresh rates , consult your user manuel

If the display resolution and refresh are set incorrectly for your CRT or LCD you will see
Signal Out of Range ( if the display has the ability to display that error message )

At this stage both displays should be showing a Windows Desktop

If you now see your desktop on both displays , you can now put the LCD on the Primary Port



No Signal Detected ( this means the display device is not receiving a signal )

If your LCD display is still displaying the error message
"No Signal Detected" after performing the trouble shooting proceedures
You may need to read the user manuel about how to enable DVI signal input.

If you are certan you have done everything correctly but still see only "No Signal Detected"

Your LCD Display may need replacement

Loch Hime :-)

Posted on Sep 14, 2008

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that typically means there is no signal coming in to the monitor. You could have a defective dvi cable or dvi port. Try another PC with DVI output and see if it works. If SO, you have a bad dvi port on the pc. If NOT, try another cable. If you tried another cable and it still fails, you could have a bad screen. Check your warranty coverage if it is bad to see if you can get it replaced.

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Doesn't work that way Max.

You can use EITHER the OnBoard Graphics,
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If you wish to use dual monitors, get an AGP card that has more than one graphics port on it.

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http://en.wikipedia.org/wiki/File:Male_VGA_connector.jpg


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http://www.directron.com/dvi.html

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So.............what is the manufacturer name, and model number of the graphics card; plus what type of monitors are you trying to use?
That is, what type of monitor cables do they have?

Know this;
My HDTV I'm using as a monitor is Digital. However I'm using a VGA cable on it. Best quality would be achieved if I got off my lazy rear, and attached a DVI Cable to it. It uses both.

VGA is Analog. A computer however puts out a digital video signal.
The computer has to convert the digital video signal to an Analog one. This slows the video signal down, and the quality is not as good.

Best to use a digital monitor. (Or a digital monitor WITH a digital cable. DVI Cable. Such as I need to do)

You are also using a PCI Express graphics card, NOT an AGP graphics card.

I'm wrong? OK.

In the meantime turn the computer off, unplug from power, and yank that AGP card out of the slot you put it in.

Tell me what expansion slot on the motherboard you put it in.

The Orange expansion slot on the motherboard, is a PCI-Express x16 slot. Uses a PCI Express graphics card -> ONLY

The white expansions slots are PCI.
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Post back in a Comment.

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Okay. Thanks for the info too...

I looked at the user's guide for this laptop and see exactly what you're saying.
I found it here: http://manuals.info.apple.com/en/MacBook_Pro_Users_Guide.pdf

So, the laptop comes with a DVI to VGA adapter because the only port on this system that will allow you to connect an external display is one that connects to a DVI port (in short, you don't have a VGA port).

moz-screenshot-3.jpgmoz-screenshot-4.jpgOkay, you have a couple of options here:

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2. You can't use the cable that came with the laptop because it only connects to the DVI port
of your laptop with one VGA connector on the other end, therefore, supporting only one
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.

This is a DVI to DVI and VGA adapter
28fefbe.jpg

This is a DVI to VGA and VGA adapter

bacdb24.jpg
Okay, now that we covered that information, let's get down to business...
Since you already have your monitors and probably don't want to spend $200-300 on a docking station, this is the best and quickest solution:

You have two monitors both with VGA connectors. Your laptop has 1 DVI port on its side (correct?).
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You can use the DVI to VGA and DVI adapter but it would complicate your situation unless you were trying to connect a VGA and DVI monitor so we can eliminate that option unless you are desparate and that's the only adapter you find to purchase.

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