ya i had a Bonk card do that...
I mailed this loose card in a bubble mailer in perfect working order to a buddy of mine but when he got it it worked like this... This has been discussed before & i believe it can be caused by hard impacts to the hucard in the mail.
Yep sparks, I ended up with that copy for an experiment I learned was not possible in the way I was trying to go about it, I may use it for a homemade region converter someday instead. The pictures of de here are VERY reminiscent of that Bonk huey, except in the case of halfway-to-fubar Bonk, the graphical display is consistent and 100% predictable. In fact, I never knew you took video footage of it, and just from memory it still looks just like that, The game plays fine otherwise, though I haven't played through the entire game on that particular hu-card.
I tested it on at least 5 different confirmed working and well played systems (three tg-16s and two turbo duos) with the same results. It's likely that the card had one of the address lines on the glop top, break, short, corrode, or otherwise fail. Now that I'm thinking about it, I may see if I can carefully scrape back the glop top on that bonk huey as a sort of education endeavor.
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I ran into the same thing a few years back, bought on E-bay...did'nt test the cards for bit . The cards look near mint(as does the case and manual), the graphics are a little more garbled then pictured above. The games were Bloody Wolf, Bravoman and Ninja spirit. I tried cleaning them and tried to push them in further, but no good. Might go try the eraser.
Actual bad HuCards are extremely rare. It's hard to believe you got three of them in a single transaction. It's far more likely you have some issue with your system, perhaps just a single pin in the HuCard slot was/is dirty/corroded, a single pin that all three games used but others didn't. Or, the contacts are still just extremely dirty.
That's assuming the seller didn't knowingly & willingly sell you a bunch of stuff that didn't work or the package was exposed to some unusual stress en route. It's really, really hard to break a HuCard (I don't mean physically, just operationally).
Even in moonwhistle's case, I feel the issue is dirt either on the contacts or in the cart slot...
Three bunk hueys in a row isn't impossible, but indeed, very hard to believe and not at all likely. Wherever the physical problem is, the symptoms of these 'partially working hucards' sounds like an issue with one of the address lines. Could be in the huey, or in the actual console, regardless, somewhere along the way it looks like data is not coming through entirely, or at all correctly down certain address lines. It could also be dying/dead logic in your actual console (hopefully never one of the custom huc processors!)
On a similar note, I have a snes that one day started exhibiting odd, yet repeatable and consistent glitches in certain parts of particular games. The countdown overlay in uniracers completely glitched to hell, the background gfx of only the intro stage of Super Castlevania IV completely garbled, and other oddities come to mind. Some games (most) had zero issues, and they were generally mild, at first I thought the carts were the issue..until two copies of uniracers exhibited the exact same problems, and I was able to test Super Castlevania IV on another console. It used to work 100%, from what I researched, it sounds like one of the custom logic chips and or cpu in that snes failed.
Oddly enough, my original Gameboy Player has similar oddities. The gba Shining Force remake is outright unplayable due to numerous glitches, and every gba game to date has eventually locked up given enough time playing in a single sitting. Original and color game boy games seemed to be a-ok, but again, I never tested it that extensively.
At first, I figured there was some overlying incompatibility playing shining force with all Gameboy Players, as all the other games seemed to play 100% ok. But then I found that the games I sat and played for any extended period of time took a liking to crashing at entirely unpredictable times. Finally I was able to test Shining Force on a friends Gameboy Player to find it worked without a hitch. Got a new one and haven't had any issues with it, put the problem one in storage and haven't looked at it since either.
I may go back and take a multimeter to the cart slot and make sure I'm getting a solid connection with all the pins with a game inserted, though I found a nice gray snes bin on ebay for $20 the very day I confirmed my snes was fubar and haven't messed with the busted one since.
Either way, I'd also suggest a disassembly of your tg-16 to give the cart slot a real good cleaning as well as to give the pins a good look over for any corrosion, Lamecat. It probably wouldn't hurt if you wanted to try the same moonwhistle.
