Street fighter the movie - donor swapped, lights blinking but no video??

[tengugurl]

Hi!
TL;DR - why would my rom and audio pcb-lights be flashing like the pcb is working but nothing pops on the screen?

1) the original mobo may have had some issues as the lights never flickered on, so I bought a exact mobo replacement via gt3d
2) cleaned the pcb up and added a missing cap on the audio board
3) reseated some roms and gave it 5.20v+ and the lights started blinking in unison
4) uh… no image though?
5) read up a lot from other posts: https://www.arcade-projects.com/thr...anyone-help-me-out-with-the-file.12158/page-2

Bought a few 74HCT541 that I can surface mount solder on but, before I do that, any other things I should try?
Seems like it could be a bad rom? If so I have read you can get dumps from MAME and compare them somehow if you dump your contents of an eprom?


Wish there was a guide (didn’t see one) because I have a programmer and I’d love to learn

Thanks!

 

[tengugurl]

 

[ekorz]

why would my rom and audio pcb-lights be flashing like the pcb is working but nothing pops on the screen?

What is your video/display situation? The game runs at just above 60hz. Not by much, but enough that I've had one LCD panel not display video. Does it have audio? i.e. Can you coin-up and play blind? After a motherboard swap you'd need to hit P1 start before you could coin up, because this is what would show up if you could see it.

As for your programmer, what brand is it? Generally the easiest is to download the mame rom, find which ones are the program code in mame source (usually they say program, main cpu, prom, or something like that) https://github.com/mamedev/mame/blo...54af4464d533/src/mame/itech/itech32.cpp#L3145 says it's the four chips called 'user1'. You'd look at the chip itself to see what kind of chip it is, and load the mame data into your programmer's buffer, put the chip in the socket, and click 'verify'. There are several revisions of this game in mame so be sure you're verifying the right one based on the chip's marking or labels, otherwise you would try all of the sets.

If you can't tell what kind of chip is on your pcb by a label, you can count the number of pins, look at what type of chip (eprom or mask) and use your multimeter to find the pinout (generally vcc and gnd are enough). Then consult this guide https://www.arcade-projects.com/thr...iots-guide-to-eprom-burning.7019/#post-108280 to determine what chips are candidates based on the data size, and use the pin count / pinout to narrow it down. I don't think this one is too hard, 256kb = 2mbit. 32pin. eprom. So 27c2001 or 27c020 should work.

Also these are all 5v logic, 5.20 is within tolerance but on the high side. The chips will live longest at 5.00, the only reason anyone dials it higher than that is because they're measuring at the jamma edge, and there is some drop off across the whole board sometimes (and they want the average to be 5.000). You can pick a chip in the center of the board (heck one of those program roms would work) and just make sure that is seeing 5.00. But 5.20 at the edge is probably too high. Lower left pin and upper right pin will do it!

 

[redorlando101]

The one I have has a weird voltage drop going to the daughter board. When I measured 5v at the daughter it was well below 5v so I added an additional ground wire. Now it boots all the time.

 

[KaPH33n]

I told you 5.2 because the chips need 5.0. I was expecting you to actually use a meter and get it dialed in though, not just set it on the power supply.

You need to make sure the chips are getting 5 volts or else they will not work. Expecially on the daughter board furthest from the JAMMA edge. Did you also look into the fuse and fuse holders?

I would make sure your power supply is good and can provide enough amperage. And as others have stated it could be the monitor that's not showing an image because you're on an LCD or through a converter? Did you try to boot the golden tee before swapping it over?

 

[KaPH33n]

If so I have read you can get dumps from MAME and compare them somehow if you dump your contents of an eprom?

if you don't want to be manual about it and checking crcs yourself etc you can use the mame RomIdent thing to determine what game roms are from (if they're in mame). Here's an online version that I have used in the past: http://romident.coinopflorida.com/

 

[tengugurl]

The one I have has a weird voltage drop going to the daughter board. When I measured 5v at the daughter it was well below 5v so I added an additional ground wire. Now it boots all the time.

Mine too has a weird Voltage drop. Where did you add the additional ground wire to @redorlando101