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Discussion Starter · #1 ·
TV-tuner card is Avermedia TV98 w/remote


I can't watch TV through the tv-tuner card anymore, because the video has lots of diagonal lines, and the sound frequently disappears altogether.


It started having a lot of picture noise (lots of diagonal lines) and dropping sound during a scheduled MythTV recording session (the problem 1st occurred within that recording). Every consecutive recording has garbled picture and choppy sound. The file size is also over twice as big as it what it should be (around 900MB vs the usual 370 MB).


Also, now when I watch regular (live) TV with xawtv, the video interference and sound problem is persistent. Even when I boot into Windows, the problem is there.


When I switch to composite (to use the VCR's tuner), the picture and sound is normal. So that eliminates cable reception problems. This leads me to believe that the problem is hardware related.



These are the things I tried in order to solve it:


1. I removed the TV-tuner card and installed it in a spare machine. The result--video and sound were clear when using the card's on-board TV tuner. So I think that the card itself is not defective.


2. I put the card back in the original machine, the problem of course came back.


3. I removed the computer from its' current location (away from other equipment), tried watching live TV, the problem is there. So it has to be something within my computer causing the interference.


4. I changed the power supply, it was getting hot actually. The problem did not go away.


5. I removed every other card, except the tv-tuner card and graphics card. Nothing was plugged into the tuner card except the composite cable. No improvement.


6. I moved the tv-tuner card as far away as possible from the graphics card, the problem is still there. Although the pattern of the video noise changes.



All this leads me to believe that the tv-tuner card itself is not defective, but I have interference problem within my computer. The spare machine is only P233 MMX, so using it for a myth PVR box is not an option.


What else could be causing the garbled video and choppy sound? I am out of ideas. Besides posting to the forum, it looks like the only other thing I could do is call Miss Cleo.


It would be easy if the card didn't work well in another computer--then I would just change the card. But now, even if I go and buy another one , it looks like the problem will persist.


Do you have any ideas as to what can fix this? The only things I haven't removed are memory, processor and peripheral HD and CD-ROM drives.


I can't go back and watch TV without Myth. I simply can't. I won't!!


If needed I can grab some screenies to better illustrate the problem.


Any ideas are appreciated, thanks in advance.



Alex
 

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Discussion Starter · #4 ·
I believe I have found what's causing this video signal interference with my tv-tuner card.


I am running an Abit BH6 ver 1.0 with an upgradeware slot-t adapter that houses a Celeron 1.4 processor.


Anyway, I took the whole machine apart this morning, and inspected cards one by one.


1. I changed the video card, the video noise problem was still there.

2. I changed the processor with an old Celeron 400Mhz, the problem almost went away.


Upon closer inspection of the motherboard, I see that the inductor coil (between the keyboard and PS/2 mouse ports, and the slot 1) is all charred.


Also, the 4 capacitors at the same location are swollen and cracked @ the top.


What happens is that the Slot-t adapter supplies voltage through the molex connector, which is out of spec for the motherboard. People suggest an aluminum plate to dissipate heat, but I didn't have one. Other than that, the motherboard works fine.


I tried again the tv-tuner card in another computer, no problem whatsoever with the signal.


So , it looks like I will have to look to change/upgrade the motherboard, or try to fix it.


Any suggestions for a Tualatin motherboard? Is it possible to replace the coil and capacitors on the Abit?


Thanks for reading this and for your ideas,


Alex
 

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You can replace the caps,, I have had to repair 5 of my motherboards,,,, Bad caps are a know problem on Abit and a few other brands of motherboards. It takes a little skill :)


I also found that they make a braided copper material that is great for removing the solder for the board connections. It makes a hard job very easy.


Here's a thread to read.

http://www.free-dc.org/forum/showthr...p?threadid=428 fixing

motherboards



good luck

Steve
 

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Discussion Starter · #6 ·
Steve thanks for the links.


Where do you get the parts? Will Radio Shack suffice? Also, what about replacing the coil? Is that possible to find?


I kept seeing information about multi layer boards--how did that relate to your repairs?


Thanks for any tips,


alex
 

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Discussion Starter · #8 ·
Thanks helzerr.


They even provide source for the caps.


I am tempted to try the repair. I have an old slot 1 processor and an old PCI video card. They should work for testing and if something blows smoke, it won't be a biggie.


Thanks again.


Alex
 

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Discussion Starter · #9 ·
Steve I just realized that it was most probably you that documented the repairs on the free-cd board. Nice work!!


I will call RS to se if they have that copper braid that you used to clean the holes. Couldn't see it on the website though....


Edit: After a bit more looking i found this soldering braid RS part number 64-2090.
 
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