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Windows 7: Dual Monitor (HDTV) Problem Radeon HD3450

28 Jul 2010   #1
lafargeotte

Win7 Ultimate x64, Windows 8 Enterprise x64
 
 
Dual Monitor (HDTV) Problem Radeon HD3450

I'm using a Radeon HD 3450 on Windows 7 with Catalyst 10.7

My monitor is connected through the VGA port, and it works fine.

I tried to connect my HDTV (LG 50PK350) as a second monitor through the HDMI port (on TV & HD3450). The TV (as 2nd monitor) is not detected and there is no signal on my TV.

The connection appears fine, as when I click 'Detect Displays' in CCC, the pc monitor screen flickers and tries to connect but eventually fails. (same using Windows 7 Display properties!).

I am using a brand new HDMI 1.4 cable.

Any ideas?

TIA


My System SpecsSystem Spec
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28 Jul 2010   #2
stormy13
Microsoft MVP

Win 7 Ultimate x64
 
 

Card have VGA, DVI and HDMI ports? If so the reason it won't work with the HDMI and VGA at the same time is both of those ports are running through the same RAMDAC, and only one of them can be used at a time.

If you can hook your monitor up to the DVI port using either a DVI cable, or if the monitor doesn't have a DVI port on it the card should have come with a DVI-VGA adapter. If it didn't you should be able to find one fairly cheaply, like this one,

Newegg.com - SAPPHIRE DVI to VGA adapter for Twin-View video cards Model DVI-2-VGA - Video Card Accessories
My System SpecsSystem Spec
28 Jul 2010   #3
lafargeotte

Win7 Ultimate x64, Windows 8 Enterprise x64
 
 

OK Thanks.

Explains why it works OK on TV without the VGA monitor being connected!
My System SpecsSystem Spec
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28 Jul 2010   #4
Zepher

Windows 7 Ultimate 64bit
 
 

Doesn't the HDMI and DVI use TDMS?

from wikipedia,
Quote:
As the use of DVI, HDMI, and other digital interface technology becomes increasingly mainstream, the
"DAC" portion of the RAMDAC will likely become obsolete. Digital interfaces use a TMDS module.
My System SpecsSystem Spec
28 Jul 2010   #5
Mellon Head

Win 7 Pro x64/Win 8 Pro x64 dual boot
 
 

That's a pretty weak card. I used to have one and gave it up. I never got the HDMI port to work by itself, much less with another monitor connected. If you need to have HDMI and another connection, you might want to upgrade to a slightly better card.
My System SpecsSystem Spec
02 Aug 2010   #6
lafargeotte

Win7 Ultimate x64, Windows 8 Enterprise x64
 
 

Hi Guys,

Thanks to stormy13's advice (the RAMDEC) I have solved the problem.

Now have HDMI & DVI connections (done away with the VGA).

Mellon Head the card satisfies my needs (not a gamer of any sort).

Thanks again this forum for another problem solved.
My System SpecsSystem Spec
02 Aug 2010   #7
Mellon Head

Win 7 Pro x64/Win 8 Pro x64 dual boot
 
 

Quote   Quote: Originally Posted by lafargeotte View Post
Mellon Head the card satisfies my needs (not a gamer of any sort).

Thanks again this forum for another problem solved.
Glad you got it fixed. It's kind of nice to see someone happy with their hardware and not always going for bigger -> better -> more. I'm that way too. My video cards are a little old, but they do everything I need them to.
My System SpecsSystem Spec
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 Dual Monitor (HDTV) Problem Radeon HD3450




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