Wow, this will save me many months of work! thank you.

I am SOOOOO excited about your AMAZING video. This is the exact problem with myDaytonnnnaaaa! All of my new chips have come in, and my programmer. I cannot find the suggested link to burn the file. PLEASE rescue me.. you’ve gotten me this far.

I have the same issue with 2 separate virtual on boards. Thank you for this video. hopefully I can get them both running, if not just 1

Thanks a lot for sharing. Always an very interesting video.

Feel free to upload a longer video that details your investigation of the graphics board. That would be fascinating.

Awesome! I’m gonna try this fix, one of my boards is doing similar things, but is also losing textures to the polygons. Thanks for this info!

Thanks for the info, I too have since bought some bad Daytona boards and managed to repair them with this information. I also had an issue where certain textures had a grid of black or white dots running through them. This was due to one of the texture SRAM chips being bad in the set of 16 in the corner. On one board the dots would appear at certain distances from the camera but the texture would be fine up close, I think the texture ram is split into four banks of four chips, each chip holds one pixel in a 2x2 array of pixels, and each bank can have a separate texture lookup, say for different mipmap levels. Also I had a Sega Rally with random missing polygons and some polygons 'getting stuck' in 3D space, this turned out to be the middle SRAM in the set of three chips which are to the left of the 4x256k chips in your diagram. When polygons appear to jump in and out of perspective, that is definitely the lookup table held in the 3xOTP roms, I had to replace two of those to fix an issue.

Another outstanding video. Extremely fascinating and helpful that you point out which parts of the board are responsible for each function. Cheers!

Great tip there, man! This is the sort of thing you don't see a lot of on youtube. I'm pretty sure it's going to help someone out there. How about putting a dust filter on that fan? I'm surprised at how many arcade machines don't do this.

great great Vid! i have Daytona board that broken like this video. i have to go to repair. thank you

Make more video's!!!!!!!!!!!!!!! Your explanations are fantastic, I have learned a lot!!!!!!!!!!

Excellent video, great information! Now only if someone would do the same for Sega Outrun boards!!

we had a cab at work start failing all we did was clean it out and replace the fans even adding some extra and it seemed to fix it for now as the parts in this cab are very heat sensitive and the fans tend to die without people knowing so there is bad airflow so pwople do remember to check the fans and clean out the dust before it gets to the point shown in this video

Fantastic video. Do you have any advice for disassembling the board stack? Are there any specific precautions to take when doing this or is it quite simple?

thank you

Thanks

I saw a sega super GT have that same issue and it was in black and white too!

Excellent Instructions. will it work the same way on my sega rally 1 twin? there i have the same issues on one side. Rgds Rainer

Many years ago an arcade I frequented had a 4-player Daytona setup, and player 4 had a similar issue. The game played properly, but views 1 and 2 wouldn't work - you would only see the background. You had to play the game on view 3 or 4!

Great video! I recently picked up a twin in terrible condition that I’m trying to fix. I’ve got one side working but on the other side of the game won’t boot. By exchanging some boards I found out that the problem is in this bottom board for the graphics. Do you have a suggestion which part of the board might cause that the whole game won’t boot? I have no LED lighting up in the cpu with this board connected. Thanks!

I've just had a PCB generate errors like you have described. My issue started with the graphics flickering so you could see the background underneath the 3D polygons, it's progressively getting worse and it's starting to glitch more now. I will buy the chips and update you on the result. Thank you very much for sharing this important information! By the way, where did you get your lovely chrome shifter knobs? Your twin machine looks great!

Thank you for the great video! Could you share where you bought the 27C040 from? I can't find any 27c040 in SOP / SOIC 32 socket. Bought 5 pcs. in reel tape from the biggest China online market and they turned out to be used. Working but already programmed. Any help would be appreciated.

Daytona USA: Quake edition Quake 1996 is famous for having weird polygon based animation.

My board has vector glitches. Took the cage out and the fan has packed in. The chips are caked in dust!

I don't believe heat can cause all this troubles because if you look in to the datasheet of the TC518128CFL-80 for instance, it dissipates only 330mW. If they are heating up is because they are oscillating. In general the cause might be some decoupling ceramic capacitors near this components or electrolytic capacitors(e-caps). E-caps has a life span of 10 years tops, after that fluid inside start to dry out and internal resistance increases changing the characteristics of the component and it will start to heat up. What I do is to replace e-caps with polymer capacitors, polymer is a dry component so this parts will last way longer than e-caps, they have a very low internal resistance but they are a bit expensive.

How much would it cost to have this board repaired. I'm having the exact same glitching issues

I have replaced all the ram on the video board and opl chip next to the ram I'm still having issues with graphics

The two Daytona pcbs I have in my Daytona twin have perfect 3d gfx and then all of a sudden all are gone?! And after a while they come back would this be the ram? seems strange on both of them its the same problem.

How do I burn to a ic32? Can only find ones that go up to ic16?

Question: How do you know when the PCB board is failing? I just has one side of the twin pcb serviced with new parts eye lids etc. Im worried the other side will go out next. I cleaned the working board the best I could

Ah yes Melted USA is my favorite arcade game

Is there a cheap way to burn files onto the chips? Thanks

Left unit is hard mode. Easy fix.

Arcade games use PIA chips and PROM chips for what?

Question if i had a spare board and took a ram chip off that could it be used if its the same type and model chip and also is it mandatpry to replace the eeprom if i use a ram chip from another dead daytona board

You fix game for your customers or for you? Do you sell boards?

I realize this is an old video but hoping you’ll see the comment…are you able to share which sop32 adapter you’re using with your programmer? Thanks!

Where can I find that diagram that shows what each section is for? That's a handy reference.

Great video. Do you offer board repairs if I were to send my Daytona video boards to you? @doktorzett

Glitchtona!

Hallo würdest du mir das bitte machen gegen Bezahlung ?

Can I pay you to repair mine?

Do you can repair my breakout PCB? The board is resetting. I have no fluke. Just analog scope.and poor logic analysis that need repair. Garbage in the screen

Haha it looks liek the car got REALLY damaged

every body is a computer engineer these days.