DVI to HDMI connection

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JimKa

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Oct 10, 2014
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Hello all,

My problem is not so rare but i'm really stuck here. I bought 2 Lg monitors 23' in order to connect them to my pc. My graphic card is the ASUS AMD Radeon 7700 series, with 1 HDMI port and 2 DVI ports. Idea was to use DVI to HDMI connection for 2 monitors and the HDMI for connecting my TV to the PC. For some reason either using DVI to HDMI connectors or DVI to HDMI cables, the monitors cannot connect to the PC. Specifically, signal on screen is given but the monitor cannot show the graphics right, like something distorts the signal showing green pixels eveywhere, while resolution is indeed 1920x1080... I tried many convertors and red that my graphic card can support 2 monitors... What is going on????
 
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Wolfshadw

Wolfshadw

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Are you getting a normal display when one of the new monitors is the only device connected to the graphics card?
Have you attempted the single display set up using the DVI to HDMI adapter?
Have you attempted the single display set up using the DVI to HDMI cable?
Have you attempted the single display set up using just an HDMI cable?
Have you tested both new monitors in the same (above) fashion?

-Wolf sends

 
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J

JimKa

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Oct 10, 2014
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No DVI ports on monitors. Only 1 HDMI and 1 VGA...
 
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JimKa

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I tried to connect only 1 monitor with all the ways you mentioned but only the HDMI cable worked. Also, the same with the other monitor....
 
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JimKa

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I did not even moved forward to connect all 3 together. Still trying to connect 1 monitor to pc with dvi port...
 
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JimKa

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Right now i connected 1 monitor with HDMI and the other with a DVI to VGA converter. There is a difference in quality (HDMI connection rocks!! :) ) and i do not have space for connecting the TV... I use this card for 2 years now, ofc without such connections... If there was a problem, i could not have found out... One solution i have is to use 2 monitors with DVI to VGA connection and the TV with HDMI but i will not have good quality, waste of money on monitors.
 
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JimKa

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I will check my graphic card model. What do you think about an HDMI splitter for two monitors? (I will leave TV out for now). Will i have same performance as single HDMI? Thanks for helping.
 
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J

JimKa

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Ok, I found solution!! I will write down so as to help brothers that may have same problem in the future.

My DVI ports from my graphic card are analog! They can support DVI to VGA connection but no DVI to HDMI connection. Even with special and really expensive converters the analog signal will never be the same as a pure digital. This can be also be checked from the shape that the DVI port has. Google the difference between analog and digital DVI ports, and you will also see the differences in port's inner geometry.

So, my solution now is to make DVI to VGA connections of my monitors and HDMI connection to my 55' 3D Panasonic, and save money for buying new graphic card with 3 digital ports on it.

To be honest, this graphic card i have is not a "strong" up to date one, so the difference in monitors will not be that high, but why not using my technology up to its limits?

Thank you guys for your answers, it was the first time i used this community and i really liked it. I will be around...
 
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Wolfshadw

Wolfshadw

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That may be what works, but it's very unlikely the answer. I find it extremely unlikely that the graphics card you purchased (which model we still don't know, btw) would come with two extremely rare, DVI-A

181px-DVI_Connector_Types.svg.png


Aside from the bottom image, all other DVI outputs are capable of digital outputs to other digital ports, such as HDMI. Single-Link DVI (missing the 9 pins in the middle) are capable of displaying up to 1920x1200 @60Hz. If your DVI outputs are single link and your displays are 120Hz, this could be the issue.

Again, without knowing the exact model of graphic card (and now your LG Monitors as well), we cannot be sure of anything.

-Wolf sends
 
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J

JimKa

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Oct 10, 2014
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Wolfshadw you were right, my solution doesn't work...

So, here i write all new progress i made (without having solved my problem):

1. My card model is ASUS AMD Radeon HD 7770
2. My Monitors model is LG-23MP75H-M
3. My cards' ports that i see are 1 DVI - I (Dual Link) and 1 DVI - D (Dual Link) plus 1 HDMI and 1 Display

Now, what i tried so far by comparing my card's ports now that you helped me is this:
1. Failed Connection: PC DVI - D port (Dual Link) + DVI - D (Single Link) Converter to HDMI + HDMI cable + Monitor HDMI port
2. Failed Connection: PC DVI - I port (Dual Link) + DVI - D (Dual Link) Converter to VGA + Monitor's VGA cable + Monitor VGA port
3. Good Connection: PC DVI - I port (Dual Link) + DVI - A Converter to VGA + Monitor's VGA cable + Monitor VGA port
4. Failed Connection: PC DVI - I port (Dual Link) + DVI - A Converter to VGA + NEW VGA cable + Monitor VGA port

As you see i made it a bit mess, because in no case i used the right combination of port and converter. So should i try to combine exactly:
1. PC DVI - D port (Dual Link) + DVI - D (Dual Link) Converter to HDMI + HDMI cable + Monitor HDMI port
2. PC DVI - I port (Dual Link) + DVI - I Converter to VGA + Monitor's VGA cable + Monitor VGA port

Now, even if the above 2 work, i will have 1 digital conx and 1 analog, but let's say that is OK for the moment as long as i am able to use HDMI conx for TV.
Also, why when i use monitor's VGA cable in conx 3 above works fine while in conx 4 no?? I went to the shop where i bought today the new cable (reason is that monitor's VGA cable is 1m long and i cannot use it, so i need 3m long cable) and we tried live the new cables and they worked just fine...

Also, why in God's name, conx 3 works while same conx with DVI - I (dual link) converter does not!!!

That's all, i hope now i wrote down all information...
 
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Wolfshadw

Wolfshadw

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First thing I'd do is check your monitor manual (found here to see if there is a way to manually control the refresh rate. If not, then I'd connect the PC to the HDTV using the HDMI cable. Make sure you have a display image at that time. Shut down the system and connect one of the monitors via a DVI to HDMI cable and reboot your system. Go into Catalyst Control Center (should be on the HDMI to HDMI connected HDTV) and enable the second monitor. This should give you an image displayed on the second monitor, but even if it does not, when prompted, click yes to save the settings.

Now, attempt various resolutions and frequencies on the second monitor until you do see an image. Hopefully, it will be 1920x1080 and some off frequency.

-Wolf sends
 
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