Lots of questions here.
Welcome.
TBC-3000 has multiple versions, so "TBC-3000" alone isn't too useful. Certain versions have developed cyclical issues in recent years, perhaps caps. Others just failed now. (I have a board extracted here, slow long troubleshooting, but about to pass it over to Diopter_Doctor for his eval.) This will happened used or not, so "new" is nonsense now. But that "new" unit on eBay was obviously not new (easy tell: the wrapper was not the stock fitting). We all saw it, we passed on it. Too many unknowns for that sort of price. But good luck to you on it.
IPS monitor, and calibrate it (Spyder, etc).
Frame TBC fixes the signal.
Line TBC fixes the image.
You need both.
Do not use OBS. OBS is digital streaming/"broadcasting" software, not analog videotape ingest/capture software. OBS does not truly connect to the card, but rather re-records from the display layers. It treats capture cards like webcams. Use
VirtualDub.
Mistake #1 = buying from eBay. The gear is sold by recyclers, not video people that can truly evalutate the gear. The terms "tested" and "working" are generally manure. Remember, this gear is all 15-25 years old now. You can't expect it to still be "new" or "like new", or even just "works great!" without any vetting to the claims. Everything is starting to need attention, meaning repairs and board-level service. Most of it should have had maintenance a decade ago, but never did, especially VCRs. So you cannot impulse buy this stuff on auction sites, the "local" Facebook/whatever sites, etc. There is good gear out there, from various refurb'ers (yes, me included, but also others). It takes us time and costs.
Here's a good recently updated thread on what shysters the eBay sellers are:
https://www.digitalfaq.com/forum/new...-ebay-vcr.html
There are many more threads/stories in the forum.
Do not buy Monster or "brand name" s-video cables. Fat headers are the problem. Quality cables are not chunky monkey, but also not pieces of Chinese string from
Amazon/eBay.
Workflow = VCR > TBC > capture card
Not any random VCR/TBC/card, but specific units known for quality.
Ideally
- recommended JVC S-VHS with line TBC >
- > recommended DataVideo/Cypress type frame TBC >
- > recommended capture card (and choice depends on OS, with XP/7 best, 10/11 worst, Mac/Linux not an option)