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Windows 7: WMC - cannot find channels / odd behaviour

24 Nov 2009   #1

WMC - cannot find channels / odd behaviour


Running Windows Media Centre on a Win 7 Acer Revo - TV Card is a USB ASUS U3100.

If I install the Windows 7 drivers for the card - the channels are found, and all works fine until...

1) I close windows media centre and reopen (it then can't find signal / channels)
2) I enter sleep or hibernate and rewake (as above)
3) I hit the "Stop" button in live TV, then select any channel (as above).
If I kill the ehrecvr.exe service - it then works again.

If I use Vista or XP drivers - these problems go away, however.....

If I change channel more than twice (doesn't matter which channels) - I get black screens. f I change back to the original 2 channels - they work.

Any ideas? It's driving me nuts!!

My System SpecsSystem Spec
24 Nov 2009   #2


In BIOS, turn off USB legacy support (USB 1.0), set USB Speed to 480 Mbps (USB 2.0) and turn off any power setting that allows any form of sleep/standby/hibernation. You will need to make sure no attached USB devices are USB 1.0 - because most systems only have one USB Hub, it will run at USB 1.0 speeds when a USB 1.0 device is attached thus affecting the overall speed of your USB Hub and all other attached devices.

Universal Serial Bus - Wikipedia, the free encyclopedia

Universal Serial Bus - Wikipedia, the free encyclopedia

Please reply with your results.
My System SpecsSystem Spec
24 Nov 2009   #3



Thanks for your reply.

Disabled legacy support for USB in bios - have no usb1.0 devices connected.

Same behavour as reported.
My System SpecsSystem Spec

24 Nov 2009   #4


Power settings? What is USB speed, 12 or 480 Mbps?
My System SpecsSystem Spec
24 Nov 2009   #5


Also, there are apparently (4) models of the USB ASUS U3100:
ASUSTeK Computer Inc.-Support-
(the date of the items in this link is today)
Which one do you have?

Only one is currently on the W7 hardware list:

I also am not sure the cpu/chipset you have is really intended for Media Apps like WMC. Did this PC come with Vista Basic on it?
My System SpecsSystem Spec
25 Nov 2009   #6


Thanks again for reply,

The Revo came with Vista basic, and I then installed a free update supplied by Acer to Windows 7. The Chipset support Cuda GPU acceleration - so as far as playing HD media, it's fine. Infact , playing TV Channels etc is fine (outside the original issues reported).

The TV Card is the one listed here:
Asus My Cinema U3100 Mini plus USB DVB-T Tuner Stick - Ebuyer

As far as I'm aware (ie - I've downloaded the drivers from ASUS), it's 7 compatable.

Sorry for being thick - how would I guage the USB speed? Nothing I could see in the Bios stated it, other than "Disable Legacy".

Sleep modes were disabled.

Thanks again for your help!
My System SpecsSystem Spec
25 Nov 2009   #7


First see this:

Windows Media Center | Learn More | Broadcast TV | Articles > Which TV signals are supported?

DVB-T. Digital Video Broadcasting Terrestrial (DVB-T) is the DVB European consortium standard for the broadcast transmission of digital terrestrial TV. DVB-T is the most widely adopted digital format and is supported in all locales in Windows Media Center. (A DVB-T tuner card is required for use.) For more information about DVB-T, go to the DVB website.

If you live in Europe and have an antenna that supports DVB-T channels, the scan by Windows Media Center might have identified channels that you do not receive. If that occurs, you can remove the channels that you don't receive. To do so, on the start screen, scroll to Tasks, click settings, click TV, click Guide, and then click Edit Channels


Reviewing your system spec's should point out whether your USB hub(s) are 2.0 only, 2.0/1.0 or just this system is newer, I am sure it is not the latter, it is not the first as the disable legacy is available, so we have only one option left. Typically, a supporting BIOS would allow you to force the speed on this hub (for example if you know you only use USB 2.0 devices). Review your manual for this.

My main concern is that your system has a common cpu/chipset installed in many newer laptops. While the manufacturer claims that it 'supports' Windows (Vista) 7 Premium +, I would ask Acer why then did they ship it with only Vista Basic (the OS for lower end hardware) and for a full clarification of what they mean by 'supports'.
The minimum system requirements have not changed from Vista to Windows 7.

Alot of people think that Recorded TV is just the same as playing a DVD or video. It is not - there is much more going on with Recorded TV.

What is your geographical location/country?

Are you using an external USB DVD?

Have you installed any software that came with the USB TV Tuner and also have you installed any codec packs? Are they installed now?

I would remove all third party apps associated with your TV Tuner, uninstall the TV Tuner drivers, shut down, unplug the TV Tuner, start up, login, plug the USB TV Tuner in, let Windows install the drivers for it, rerun WMC setup from the beginning and report back.
My System SpecsSystem Spec
27 Nov 2009   #8



Thanks again for your reply.

Uninstalling all drivers, rebooting and plugging in the TV stick resulted in Windows not finding a driver, and the TV Stick showing as a yellow cross / unknown in device manager.

No extra software or codecs installed - this is a fresh Windows 7 install with nothing on it.

Just to re-iterate. I can record and watch TV on this device with no problems (other than reported in original post).

I'll experiment on another windows 7 machine this weekend and see if I get similar problems.
My System SpecsSystem Spec
27 Nov 2009   #9


peterm, please try to respond to all questions as best you can as this forum is read by many and it will become helpful to others to see how your situation was resolved and what fixed it.
My System SpecsSystem Spec
27 Nov 2009   #10


Sorry, based in UK , no extra devices / drives / DVD players attached.
My System SpecsSystem Spec

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