Total Carnage issue

tomtime

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I picked up a converted Smash TV with Total Carnage in it. When I power it on I hear the Midway bing sound and thats it. There are two LEDs on the pcb that light up. I checked the PS and it has proper voltage. Any ideas?
 
My Smash TV had a lot of problems with poorly seated roms, I think Smash TV & Total Carnage basically have the same setup for their PCB's, right? You might pull the board and carefully press on all of them to make sure they are getting a good connection. The big rom U99 was the culprit on mine.
 
pull all the chips and clean the legs with finegrit sand paper (600+), clean up the edge connector with an eraser, power it up if that doesn't work check the 2 large socketed chips (CPU/GPU) (tap on it while the game is on).

Smash TV and total carnage use the same board as MK (Y unit).

also check for damage to any of the yellow/orage resistor network chips.

edit: i'm kinda thinking it might be the GPU chip (brown socket), check it for damage/cracks/warping. if you have a PLCC chip puller carefully pull it and put it back in.
 
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So I cleaned and reseated all chips and no luck. What are the two leds trying to tell me? It doesnt say in the manual.
 
not sure what the LED's are for other than power and maybe power/signal to sound board. have you tried another jamma board in that cabinet to insure it's the board and not the cab?
 
I have no other JAMMA pcbs, only my MAME setup. I did just win a working when pulled Total Carnage on fleabay though.
 
hah i was eye'n that but i have a working boardset. once you get it test it out and see what you find from there.
 
the U99 is the black socketed chip in the corner if I remember. I'm certain that was the graphics chip on the Y-units. if yours is socketed, of course, some of them weren't later in the Y-unit's life and I never saw a Total Carnage board before, but I'm sure it is socketed. you'll know if it is. I would encourage popping it out and plugging it back in and make sure it's as far down as it goes. get a small flathead and alternate trying to twist/pry it upward very gradually all the way around, making sure to raise it on each end as evenly as you can (to prevent bending the pins)

this of course all assumes that your game works despite the black screen. try adding credits after a sufficient amount of time for it to do the rom check and see if the game plays.

besides that, I would pull the board and start inspecting traces and other weird anomalies...
 
I will try to pull and reseat the u99. I have inspected the board and everything looks good. The only thing I noticed is all the labels are removed from the chips.

I have tried to coin it up and it wont. I hear the bing sound on startup. If I turn the volume all the way up I hear some wierd audio loop.
 
yeah ok, then that's not it. you verified voltage at the power supply, but did you do it at the JAMMA edge, or more importantly, a rom socket? just wanna rule out if you have significant power loss at all. Williams/Midway made their power wiring runs extremely long, it's not uncommon to lose like .15-.25 or in the very worse cases half a volt.

make sure your JAMMA edge connector's clean too. I never bothered checking this until this year, and boy what a difference it makes. just use a pencil eraser on the contacts if they're dark in appearance.. make sure the eraser shavings are pushed off the board though.

to test voltage at a rom, look for the U-shaped notch on the socket (they face upward) and stick one meter probe in the lower right hole, and the upper left. this is what your like pure voltage is, cause that's your component voltage. as mentioned, you can lose a lot of voltage between the power supply and a rom, in some cases where it's too low to operate the board.

another thing, I never tried this, are all your security chips installed? they're about 7 or 8 little chips above the game rom banks, and a big one in the corner by the U99.
 
I have checked voltages at the PS and at the harness and all is good. I will check at the chips to see. All chips are present too.
 
how the hell can you tell which is the CPU and which is the GPU? i figured that u99 was the CPU as it was bigger and more cpu like looking, while most of the time i found graphics chips to look like the u36 (brown socketed plcc looking guy).
 

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the little TMS340235723580273528067 PLCC chip = CPU

the one that says Texas Instruments. :p

U99 could very well be a DMA controller though, like the T-unit UE13, since they're both called "Custom Chip", I never figured out what that big IC does underneath it.

btw, FUCKING IRONIC that the rom we used with that picture is a UG22, the one damn chip I need to make that MK2 work. :(
 
lol, it's a great pic. i keep it handy for those moments that my short term fails or times like this :D
 
I just tested my pcb in a Smash TV cab and it didnt work.

damn, well atleast you have a spare on the way and you can have a 2nd board to compare it to. If you ever decide to get rid of the dead one let me know.
 
Will do! Im keeping my fingers crossed on the one I ordered. I will eventually have Total Carnage and Smash TV in the same cab with a jamma switcher.
 
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