Yie Ar Kung Fu Arcade PCB repair - Garbage on the screen
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- čas přidán 2. 09. 2022
- This time we are dealing with CPU issues - at first it seems the CPU itself is the problem. But how to go on after the freshly ordered replacement part shows the same issue? I nearly would have uploaded this vid as an "unsolved repair" when I was able to get the repair going again. After the cpu was back up running some logic ic was acting up. Enjoy!
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It was a hint in this repair that allowed me to finally fix the synthesizer I had been struggling with for months. Thanks for all the logic troubleshooting lessons.
Great job on the repair. Also, well done explaining it all. I also repaired a Yie Ar Kung Fu board last year and documented over on the Arcade-Projects forum. It was my first repair and very fun!
Thank you very much! I really like this game can't stop playing it since it is fixed... ;-)
Nice job doktorzett 👍. When you found the problem ic, I noticed it was Fujitsu branded. These Fujitsu logic and ram chips seem to be common failure points on arcade boards these days. They've obviously lasted well outside there design spec though, so can't really be that tough on them I suppose. But it just goes to show the quality of these old chips. And the more reliable brands are still going well over 30 years. I don't think today's tech will get anywhere near that level of reliability.
I never really payed to much attention to the brands of ics that I replaced but Fujitsu seems to stick out.
👍😃 Another excellent repair video. It was obvious on first power up that the board was "watchdogging" but the question was why? After checking the basics of the CPU (power, clock, reset, halt) the fact that there was no activity on the address or data pins immediately pointed to a dead CPU. The 6809 (my favourite 8-bit CPU) fetches its reset vector from FFFEh & FFFFh on power up so there should be some activity on the address and data lines. Unfortunately you then fell foul of the massive market in fake chips from China. I would never have trusted chips that were that cheap and they immediately looked suspect by how shiny the legs were. You tend to get what you pay for. It would be interesting to "delid" one of those fake 6809's to see if there is any silicon in it at all - I suspect not. Fluke 9010A's are rare but 6809 pods for them are even rarer! Your troubleshooting was an excellent example of knowing your test equipment and what it is trying to tell you. The subtle change in brightness between a logic high signal and a floating pin is easy to miss on the logic probe so well done for spotting it and pointing it out so clearly. Tracing the source of the bad signal back to the 74LS32 was a good example of how to use a schematic and then explaining why that chip must be bad by explaining its logic function and the fact that the signals did not correspond to it was very well done. Your reward was a working board - congratulations! 👍😁
A great resumee of the repair - couldn't have gotten it better. Actually a great idea to "delid" one of those ics and check what is in there. Thank you very much for your comment and for liking my vid!
It makes me very happy when I see you've uploaded a new video. Even more so with one of my favorite games! I have this board myself too. Thanks for your amazing explanations, it makes the channel such good quality!
Wow thank you very much! It's nice remarks like that that keep me going actually!
@@christophzett So it should! We want you to keep going!
Great repair video! So glad you couldn't use the fluke lol
Thank you for going through each troubleshooting step with us!
Thank you very much. Yes, a real basic repair with schematics a logic probe an eprom reader and a cheap oscilloscope - those are the best repairs!
As always with your videos, I've learned a lot, thank you.😎
Glad you enjoyed it!
Another awesome repair!!!!
Thank you very much! I really appreciate a positive feedback from a pro youtuber of a similar trait! Makes me happy, seriously! ;-)
Enjoyed this, thanks!
Nice repair video!
Thank you!
Yes, finding a reliable source for CPU's is challenging. I ordered 20 6809EP's and 9 were bad. Some where not the E version. I use a JROK board (Williams) with a ZIFF socket to test 6809E's in. I also ordered 20 Z80A's and 1 was bad in those. The 6502's I had 4 bad out of the 30. For testing the 6502's I use a Centipede board with a ZIFF socket. The Z80 boards are pretty common so I just use the closest PCB at the time :) I bought the 6809's and Z80 from UTSOURCE and the 6502's from eBay. The eBay seller just sent me replacements. The UTSOURCE wanted the bad ones shipped back, which would have cost more so I just ate the cost of the bad ones.
Very interesting - maybe I should check my cpus again - maybe they are 6809s after all - not 6809es.
Hi doktorzett, as usual this was a very nice video! You might want to get a NOP-tester for future repairs.That device could have shown you easily that the CPUs are bad. Do you happen to know why the markings on the KONAMI ASICs are milled out?
NOP tester! I just googled that. Nice tool! Might buy or build one soon!
Nice one. You should erally upload way more often! Not once in a blue moon.
Yes I would really like to - because it is fun! As everyone else I often lack the time unfortunately.
Nice video. Dodgy Alibaba chips? Could you tell us more about your test rig, the connectors and adapter, power supply etc?
bad away nice work
Thank you!!! ;-)
Hi! maybe you can help me: I have two Arkanoid pcbs, one "tayto" bootleg, and another Beta bootleg... the "tayto" bootleg has the normal sound pitch like the original Taito pcb, but the Beta bootleg has the sound pitch too high...is there any way to fix this (make beta bootleg sound pitch normal)??
Very interesting repair as usual. I've been lucky so far. A couple fake Eproms were all that I had to chew. And those were even repainted but working equivalents. You could try to crack open one of your fakes and look at the die under a microscope to see what they've really sent you. Aren't you curious?
Great idea! I will actually do that! How would you recommend opening them? With a cutting tool like a box cutter? Or with a dremel tool?
Very nice, when is the next video?😁
Well I have another dead Double Dragon coming in an I really would like to do a pac man or ms pac man repair. What do you want to see?
@@christophzett well I have a couple Double dragons to fix so I vote for Double Dragon
Hey @doktorzett I love your logic probe. I’m gonna pick up the same one. I noticed the ends are like plugs. Is it ok to replace those with alligator clips? I think that’s what you’ve done with yours but I just wanted to confirm. Thanks!
The ends are actually not plugs but by default special ic leg clips that you also find for instance on a logic analyzer. They are even better than alligator clips and I highly recommend them. I normally hook them up to a 74 series logic ic.
@@christophzett Ah thank you. I just purchased the probe and the pic of the ends dont really look like clips. They look like just small pinned plug ends.
i.imgur.com/SL6G1zR.png
we talked about that.
i have super breakout that resting.
EPROM o.k by reader.
without fluke how can caeck communication with cpu?
ram etc
eed fluke and logic analysis.
with logic probe i dont get anything
Well just start by looking into the shematics and checking basic cpu signals and busses and decoding/CE and OE and WE signal lines like in this video.
how logiv probe know if Data correct?
It doesn't.
enough with chips Chinese ic
just Europe or us ic
;-)
I got burnt from ebay with some 8080 cpus so after that i will never bother buying from there again,
Well you get what you pay for I guess. There were too cheap by far.