Green lines in VHS capture woth AVT-8710, TBC-1000 connected?

[jbd5010]

Hi all - I'm having a weird issue. I'm getting repeating horizontal green lines in my VHS captures when either my AVT-8710 (green known good model) or my TBC-1000 are connected between my JVC SR-V10 VCR and my ATI AIW VE (7500) capture card, via S-Video. When the VCR is directly connected, no green lines. I've attached samples, the file names are self-explanatory.

All hardware is plugged into a UPS for surge protection. I swapped out S-video cables, no change. I've tired 2 home-recorded tapes and a commercial VHS, same problem.

Any ideas?

[aramkolt]

I feel like I've seen this exact test footage or at least a screenshot in something to do with chroma noise haha.

But yeah, it's odd that both TBCs are doing similar things. Did they ever used to work or did they both just start doing that one day? Had it been several years ago when they last worked if they used to work?

I'd say also try capturing the output of something like a DVD player or composite video game console (that won't have timebase errors) and see if the TBCs also add lines to that stable signal as well as a next step to test.

I'm assuming neither TBC has had caps replaced yet?

[jbd5010]

Lol, probably because I started working on this like 10 years ago and then put everything in the attic and am finally getting back to it 😅 I may have posted a sample from that video at some point.

The AVT-8710 was literally working yesterday. The green lines appeared, so I got the TBC-1000 out and hooked it up to find the same issue. Cracked the TBC-1000 open, all caps look fine (not even slight bulging). Of course I didn't test any of their values but I've replaced electrolytic caps quite a few times over the years in various electronics and they looked totally fine. I feel like it's an issue with my ATI card...

[lordsmurf]

I can't look at clips now.

In 99% of cases, "green" (lines, blocks, blackouts) means capture card driver issues, or HDD/SSD errors.

[jbd5010]

Well - I somehow forgot the cardinal rule of technology troubleshooting: "Have you tried turning it off and on again?"

I rebooted my WinXP machine, and the issue has resolved itself. I did power cycle both TBCs before, but not the computer itself.

[lordsmurf]

Ah, good catch.
And the reset corrected a likely temporary in-RAM bug (drivers, storage).