Mortal Kombat 2 Arcade Sound Board Repair [HD]

[@Ur2ez4me81]

It’s awesome to see someone properly fix a piece arcade game history.

[@0utworld]

I'm digging right into these videos. Your knowledge of the boards & functions of each part are proving beneficial in the maintenance of my own boards. Thankyou for filming all these.

[@IIIRAYDENIII]

These tutorials are gold!

[@TotalMK]

Nice work! U37 is an IC called TL084, which is a "Input Operational Amplifier" a common IC that is easily replaceable. :D

[@YourMKArcadeSource]

TotalMK Thanks!

[@PSYK0MANT1S]

I LOVE YOU! I had a troublesome board that was being a brat. Same symptom. After reseating the roms, and hitting em with a tooth brush, and some contact cleaner, everything fired up. That sweet "BONGGGGGG" Thanks a ton!

[@YourMKArcadeSource]

You’re welcome!

[@PSYK0MANT1S]

@@YourMKArcadeSource so same board, out of the blue went quiet again. Not sure. Same issue here. Perhaps my u37 is going bad. I'm going to need to source one.

[@BoxArcadeArkansas]

@@PSYK0MANT1S what was the final solution?

[@evh347]

This is great. Can you please do a video on how you program your chips, where you like to get them, and what tools you need to program them?

[@mennuku]

replaced the chip but didn't work for me. The chip that caused the issues with my sound pcb was u16 which is a AD1851N. replaced that one and everything came back to live. I had very similar distortion with the bad chip.

[@YourMKArcadeSource]

Interesting! Good job!

[@bruck221]

Very good! thanks for the strength your help even reached Brazil

[@pedro6994]

Hi, the capacitors at C58, C59 and C60 which capacitors did you use there? I think the ones I have removed are 0.1UF 100V 1.50MKT CAPACITORS. You mentioned Tantalum capacitors?

[@gamingo_gguyverx6812]

YourMKArcadeSource I love it repairing tutorials I have learned alot from u and other techs by watching ur videos I know all when it comes to wiring controlls Jamma boards and setting up power supply how ever can u make a step by step tutorial explaining how to connect different crt arcade monitors to when it comes wiring it up to isolation transformer and how identify what each wire is for and how to connect it to chassis thank u now I know each monitor chassis are different how ever they would be such a great help thank u

[@kevinthorn9672]

What kind of brand desodder wick do you use one have dont work at got it off amazon

[@johnclaybon9421]

Thanks for the video. Where can I purchase a replacement amplifier for an MK 2 soundboard? Thanks

[@YourMKArcadeSource]

www.arcadepartsandrepair.com/store/integrated-circuits/misc-chips/mb3731-amplifier/

[@jaybee1158]

Where would u get the rom chips from?

[@theamazingworldofchewy2220]

I replaced that chip along with caps, and amp and I’m still having low sound. Anything else I can look into or maybe ship it to you to take a look at?

[@raptor2569]

where do you get the cap kit and the u37 chip?

[@YourMKArcadeSource]

raptor2569 You have to piece them all together individually. You can get all the caps and chip, etc from Mouser.

[@delsarcade]

Thanks for this. I've lost sound on my Total Carnage PCB and I've checked all cables. I will diagnose it further.

[@YourMKArcadeSource]

You're welcome.

[@arcadeworkshop4167]

why didn't you use a socket?

[@YourMKArcadeSource]

ArcadeWorkshop Didn't have one.

[@snot416]

How do you determine which chip it is? I'm having a very similar problem with Terminator 2. I can't figure out which chip to aim at being the culprit.

[@halouforten]

Dear @YourMKArcadeSource I have a similar issue, the light on my sound board lit on but I can´t hear any tones and can´t even hear noise or something if I put the volume up.. the problem started intermittently, sometimes the audio was very low and garbled, suddenly normal and so on until today that absolutely nothing is heard what you do think is the part to be replaced here? Please help me

[@halouforten]

UPDATE: today I turned it on again and at first I did not hear the tone or the sound of the game, about 20 seconds passed and I began to hear the sound very low and garbled, and suddenly it normalized .. right now it has 20 minutes working normal until I turned the volume up almost to maximum, this caused the game to reset.. what could be the problem here?

[@MarkMarkMark]

Hey. I can bad rom checks. And it makes sounds, but they are not the correct sounds?? Once again... maybe the crystal? Example is: I'll here a bicycle kick when I do an uppercut. Weird stuff, nothjngs the right sound... but makes a wrong sound. Any idea?

[@tammypalumbo3973]

we have a Mortal Combat II and do not have sound...We bought it off of a guy who was selling it, it worked fine and had sound, but after we transported it home the only sound is the Mortal Kombat when you first turn it on, and it just continues to make a humming sound...Can you help??

[@barryjohnson5288]

I'm trying to get my MK2 sound borad fix. How would I go about doing this?

[@azariayehezkel9064]

Arcadeshop, I see the video right now and want to ask this question .and i see yours questions. You right :-)

[@lolinosmurf]

Great job! My mortal kombat 2arcade sound board is completely silent...could be the same cip?

[@kevinthorn9672]

Ok mike check this out ..i replaced caps the gal chip the clock Krystal the black amplifier part.and the u ic chip and nothing no led light but now i hear some static out of the speaker when its on now??? I lve watched all ur vids on this board and my soundboard looks to be beyond repair i also replaced the sound u2 chip have anymore that could be wrong with my board?

[@brandongamboa6315]

thank you I have mk arcade's so I enjoy your work your the man thanks again for the video

[@spunkybruiser]

Do you know what kind of chip that is needed for the replacement. We have one doing the same thing and I do not have the board in front of me at the moment.

[@diegoaguerregoyen6399]

awesome! love your hardware repair videos, do you also perform general electronics repairs?

[@YourMKArcadeSource]

Depends on what it is.

[@royordelman6789]

I have the same problem whit my mk1 y unit do you no wich wan i must check or chance and how to check it wit logic probe?

[@Sowerwinea]

What part did you use to fix it. Can you send a link.

[@alfredgallardo9930]

great video I have one that is doing the same thing by any change do you have a list of caps and the u37

[@YourMKArcadeSource]

No, unfortunately. I just got the info off the old parts and ordered what I needed. Give me a few. I can get you a list.

[@alfredgallardo9930]

Ok thank you. Again great video

[@YourMKArcadeSource]

You're welcome. Thanks for the kind words.

[@ricardo77773]

Thank you for share very interesting sound pcb repair.

[@Sowerwinea]

Where are you located?

[@rodrigoandressosa7824]

Hello, I need help, I have mk2 ver 3.1 without sound, the red LED does not turn on, it has no test tone, help me please

[@Spolupyo]

Nice, can you also do the same for Mortal Kombat 1? whre should I start? crystal oscilator?, AMp, caps?

[@Kment011]

I think my soundboard for my MK2 has an issue, are you willing to take a look at it?

[@LockeTheCole]

Hello, I have a question about the MK1 sound board. I bought an MK1 to fix up and it starts fine, Test tone, game music, and then horrible noises with the music and some sound effects in the background drowned out by the noise. It almost sounds like a loop of people cheering but it could just be my mind trying to make sense of LOUD gibberish. My theory is some of the sound ROMs are bad (I need to get a rom burner so I can't test them against mame yet) but I thought maybe you had run into this issue before and could confirm my theory or know what the issue is because you had come across it before. I appreciate any help and your time. :) Addendum: So I ran downstairs to check it out one last time before posting this (I decided to look around for info on the game/boards etc and found your great stuff), and apparently I have one of the prototype boards (the telltale yellow wire rocker switches) so I have a second question, can you run all the other Y board roms on a prototype board?

[@YourMKArcadeSource]

1. That very well could be bad roms, but also could be a bad ribbon cable. Unfortunately, the test tone only indicates that the hardware is working, not if the roms are bad. MK2-MK4 will give you multiple tones as codes to tell you which rom is bad. Mk2 does not do that, so it's hard to tell which one of the three roms is bad. 2. Yes. The Proto board will support every Y-Unit revision.

[@Airness1]

I have the same problem with my MK 1 sound board. I am trying to determine which chip to swap out for a new one. Any help would be greatly appreciated

[@SoulSnatching]

Hi, I have a similar issue with my sound board. The test sound started to disappear along with the in-game sound and it's been on an off lately. Would you be able to have a look at it if I shipped it to you and ofcourse compensated you for your efforts? I'm from Hungary and unfortunately people with knowledge of these boards is in short supply here.

[@kcase601]

What is the part number for U37? Do you have a source for the MK1 Power AMP? Thanks

[@foxbodystang8587]

Hi...do you have a website or email where you can be reached for a repair question/guidance on a Nba Jam conversion?

[@YourMKArcadeSource]

No. What is your issue.

[@kevinthorn9672]

Hey mike im gettn a sound irq detect functional no light on led no sound at all.. Just picked up this board the game plays fine..

[@YourMKArcadeSource]

Most likely a bad GAL. The chip right above the main controller in the brown socket. That’s the chip responsible for the LED.

[@kevinthorn9672]

@@YourMKArcadeSource gotcha im gonna see if i can replace it i mean i know how to replace the caps and sodder ill check them with a multimeter see if there bad.

[@wildchild6340]

I just bought a mortal kombat 2 cabinet and the test tones work but not the game sounds. It turned on the previous owner had the ribbon cable backwards on the soundboard. In case this helps anyone in the future.

[@fabriciocastro4322]

Greetings from argentina!

[@fabriciocastro4322]

Captain Brandon Horror Lover Yes, MK in Argentina is Very famous the games still selling and downloading Greetings!

[@workbirdygaming]

do you sell arcade and if so how can i get in touch with you to buy?

[@YourMKArcadeSource]

No. Sorry.

[@jaygallegos8612]

Im not getting any sound at all. Except for the hum. I have the board installed in an mk1 cab, waiting for my switcher and consensor. But I doubt thats the problem.

[@ulisesarias1887]

Hi, Where can I buy the U37 chip? Thanks

[@chrisj3460]

Mine just went out do u have any contact info

[@jvega6381]

Will a mk1 work on a mk2 ?

[@YourMKArcadeSource]

Nope. Two totally different boards.

[@jvega6381]

@@YourMKArcadeSource ok thank 👍🏼

[@sebastiaanvanderaar9894]

when i fire up the board the amp makes the buzzing noises, however it starts to smell bad like a piss smell😛 replace it i think.

[@Vis3c]

my mortal kombat 3 pcb does not display anything... just sound. you know what this fault could be? monitor works, i tried it with a pandoras box i had laying arrund.

[@YourMKArcadeSource]

Make sure the U45 and U47 graphics chips are seated all the way. It's likely one of them is not or one of them is bad.

[@Vis3c]

also my mk1 pcb just displays a yellowisch screen, no sound as i can tell, any tipps wit hthis one too?

[@xefour]

Hey mate, I looked around for a way to contact you but I couldn't find an email address anywhere in your info. I think I can speak for many MK fans to say thank you for everything you do. I also would love to find out about two MK related things. 1. The story behind how the EJB menus were discovered? Who, how, when, why. If you have any information I think it would make a fantastic video and 2. What can you tell us about UMK3 Wavenet code. What do you know about it, are there any known dumps in the wild? Thanks again, Adam. (Sydney, Australia)

[@hectorortiz91]

i appreciate the work yoy do for these arcades. my arcade will go to the start up screen but gets stuck will just keep saying "initializing game" like if it is loading but the game does not start. this is for a nfl blitz. what can be the problem? all info is appreciated

[@kcase601]

Do you happen to have any MK2 Sound boards for Sale? I have a MK2 PCB but no Sound Board. Let me know if you have one for sale or know of anybody that does. Thanks Kevin.

[@YourMKArcadeSource]

Not at the moment. Sorry.

[@chevchelios9037]

Hello, having similar issues on my Smash TV sound board. Anyone know what might be causing it or which chip needs repair? Thank you.

[@mennuku]

I have a MK2 sound board with the same hum. Ordered some TL084CN they are really cheap so might give it a try. Will post an update when i get them.

[@christof8963]

Hello g is still a problem no sound on my mk2 big capacitor and small capacitor change capacitor blue 10uf change crystal change amps change eprom change and still the same thing not of his cable and 5V ok walk on my other MK2 thank you

[@stefanthurm5475]

My sound board went out!!! Please help. Message me if you can help me fix it please.

[@i5aac1234]

love it!

[@cesarmorales2737]

Nice work Mike

[@AKSnowKitty]

This is exactly the symptoms my board is having. Fortunately, I had a spare board I threw in my machine, but now I want to order a new U37 and see if that fixes things.

[@filthyrichandflameingknigh1256]

You know this is same problem i have with my jr pacman cocktail table i just got. And this only way i can subscribe it the same sounds comething the speaker. Kinda like throbbing sound and like you can kinda hear the sounds but there like not really comeing out the speaker sounds right like i can turn it up volume but sounds like this mk2 arcade that you just fixed. I wonder what chip is on my broad that is on the jr pacman that like your u37. If anyone knows the answer to my problem on jr pacman broad tell me please

[@drschoeps]

My ribbon cable was backwards it thanks so much you are the fucking best!!!!

[@YourMKArcadeSource]

Sweet! You’re welcome!