I also recently purchased a DH77EB to upgrade an older HTPC and like playst, I too am having an issue with the board detecting the tuner card I have been using, a Hauppauge WINTV-HVR-1800. After trying to determine what my Hauppauge card and playst's Leadtek card have in common, I realized that they both share chipsets made by Conexant.

The website linuxtv.org helpfully provided the exact Conexant chipset used in the WINTV-HVR-1800. Using that information, I went to Conexant's site and looked up the chipset that provides the PCIe bridge function on the HVR-1800, the CX23887. There, I noticed that there was a product bulletin for the CX23887 (available here).  Therein laid the answer:

I'm not sure what Intel can do to correct this but the issue is with the Conexant chipset used. This really puts a damper on the excitement of buildling a new HTPC system.

That's a great bit of sleuthing there potsdam!! Maybe the card manufacturers will be willing to repair or replace them under warranty (assuming the products are still within the warranty period) or even at a small cost if outside of warranty. Otherwise it looks as if it's a case of try to sell the cards secondhand (to people who have compatible systems) and buy replacements that will work.

This is disheartening. I, too, was planning to upgrade my HTPC with the same motherboard and a Hauppauge 1800 tuner this weekend. At least I know now before spending hours being frustrated that my computer isn't working correctly.

Have either of you actually tried contacting the TV Card manufacturers and asked what (if anything) they're willing to do about this? Sometimes chipset manufacturers provide updated chipsets to card manufacturers for such cases (eg Intel with the recent SATA problems prior to B3 stepping on some boards) so a fix may be possible and may even be free for this 'known issue'..... If not, ask them why not.

I contacted Hauppauge earlier today via their e-mail support form. I'll post back with their response once I hear from them.

In the meantime, I tried the tuner in another motherboard with a PCIe 2.0 expansion slot, a Biostar TP67B+ that has the P67 chipset. The tuner was detected and I was able to install the drivers without a problem. There must be some sort of edge case issue that the CX23885 PCIe bridge these cards use that doesn't play nice with the H77 platform controller hub.

I also scoured around a bit with Google and also found this guy's experience with an EVGA and an HVR-1800 board interesting.

I contacted Hauppauge earlier today via their e-mail support form. I'll post back with their response once I hear from them.

 

Here's the response I received from Hauppauge after explaining the issue the HVR-1800 is having with current motherboards such as the DH77EB, linking the Conexant product bulletin that explains the problem, and asking if there was a later revision with the updated Conexant PCIe bridge chipset:

The older 1800’s have been out of circulation for a while and with no warranty on them we can’t offer an exchange to the HVR 1850 unfortunately.

I knew it was a longshot but it still stings that I am stuck with a useless card at the moment. I specifically remember going for a PCIe version of the Hauppauge tuner card at extra expense as I thought it would carry over to my next system.

Going through the links that spathi posted earlier, I did find this thread wherein another tuner manufacturer that also used the Conexant CX28835 was able to work with Gigabyte to issue a fix via a BIOS update. I hope that we can also bring this issue to the attention of engineers at Intel who can subsequently work out a similar rememdy.

For what it's worth, I started a chat with Intel customer support explaining the issue and referenced this thread and the one I posted just above. Hopefully if enough people start to complain, the issue will reach someone who can work on a fix.

Have same issue.  Is a problem that Intel needs to fix.  Hope it can be addressed with a Bios update, and that it is not a fundamental flaw in the 77 Chipset design.

My issue is tuner card not detected by Bios,even when u go in to the bios, it shows PCIe slots as empty.  I was told that I needed a 420W power supply,but not sue how that is supposed to help, though I did try that.

Am getting my Intel manager to look in to it, as Gold Certified partner hoping to get some answers

Regards,

And just got this reply from Intel Support, with my response below

Intel

If the issue
is not yet resolved you may also try to consult the manufacturer of the TV
tuner card for any possible firmware update. You may also check with them if
the card is compatible with the new 7 series of motherboard. Please double
check if the TV tuner card was released prior to the 7 series was made, if yes,
you may need to consult the card manufacturer for compatibility issues with our
new boards.

We would be
temporarily closing this service ticket and if you have any other concern,
please feel free to contact us and we will gladly reopen the same service
ticket for you.

1. Ok...that
   is pretty poor response from Intel. The card has worked fine in other systems,
   including a dh67. So why should I have to get a brand new card cause you have
   done something that stops pcie from working.  Also the 7 series has only
   just been released, so how could a tuner card supplier have already gotten this
   sorted....should it not be that a new board should still be compatible with
   older pcie cards!

I am
not the only person with this sort of issue, as the Intel forums are full of
people with similar issues.

Please escalate this...this is something Intel should
fix, not my tuner card supplier

I tried the latest 0075 BIOS update to see if there were any changes. Unfortunately it still does not work. My Hauppauge card does not show up when looking at the PCIe slot status in BIOS.

Does anyone tried the new 93 bios?

@ Potsdam: About your Silicon Image Issues, my Card (technotrend 4100) seems to have a different Chip, i can't find this Chip on the PCB,

so maybe there are many Chips not compatible with the Chipset? Here are more Pics from my Card:

http://rickcaylor.websitetoolbox.com/post/TechnoTrend-S24100-DVBS2-PCIe-ok-for-crazyscan-5675262

On the other side, i doesn't have about Problems with H77 Chipsets build by other Manufacturers with DVB Cards?!.

A Card that should work is the Digital devices V6

Edit: I have tried the 93 Bios today, still no Fix for my TV Card.

Yesterday i got an answer from Technotrend; their card is an PCIe 1.0 Card and the Mainboard have PCIe 2.0 Slots. In Order to detect the Card correctly the Board have to set the PCIe Mode to 1.0, but it doesn't.

They also say that other Manufacturers fixed the same Bug with an BIOS Update.

Today i found a RelNotes from one Asrock Board B75M:

Seems that all Manufacturers have this Problem, but the others try to fix it.