Your troubleshooting is pretty well what all technicians do. Trace the path and look for expected results. You do such a great job on these devices. Transistors can be tricky when they get intermittent faults. Likely a degraded junction
Thanks Brendan we appreciate you checking all this stuff out, it's fun to figure them out, but sometimes it's major headache stuff... I'm working on a few right now like that :)
I want to thank you for this video. I had an upright Asteroids that was not displaying video at all. I traced it back to this same circuit and discovered neither transistor was being turned on (so no INV and no NINV). Your explanation of the circuit helped me narrow it down to a bad resistor (R143). Now I have video. Thanks!
Very cool Darryl! We've got to figure out away to get this info out there so people in the future will be able to keep these things up and running. As i'm sure you realized when you fixed it, usually it's something so simple, one little component broken somewhere keeping it from doing it's thing. That resistor in bulk would be like a PENNY part. Really fun when you get it up and going again for a penny!
Hmm... Replacing the transistor worked, but the old one passes a standalone test... Is it wrong to imagine that the solder joints just needed to be reflowed?
I just picked one of these up for my collection. It worked fine until we moved it to the new house. Now, all the lights turn on and it hums pretty loudly. Nothing on the screen. all the lighting works. Any ideas where to start troubleshooting?
Need to look inside first and see if something came loose or fell down onto the fuses at the bottom of the cabinet, if the monitor boards are still where they're supposed to be, etc. Sounds like it might be a bad connection on the main game board to me.
@@LyonsArcade Thank you for the quick reply.I went through the connectors and could only find one disconnected. It was one of the two plugs that go into the self-test switch below the volume control.I'm trying to determine which terminal it connects to. The player one and player two buttons blink. There is an LED lit on the PC board and also the Monitor board. There is a slight glow at the back of the monitor.There is also no sound. I removed the main PC board connector and clean the terminals with no change.I removed all the fuses from the power supply and clean them and verified continuity. I plan to move on measuring voltages from the power supply to the mainboard. Any other suggestions?
If you look at the back of the game, on the right side of the monitor there is a big plug, take that loose and clean off the pins on that board, then plug it back in. Your heater circuit on the monitor is probably not getting a good connection there.
@@LyonsArcade i disconnected the plug and the board. cleaned and reinstalled all. still no picture. i have had this game for a while. it worked fine for a few weeks, then the picture would fade more and more. now i have no picture but the game is playing. is there anything else i should look at? thank you.
When it does that it is almost always bad solder on the monitor deflection board. Look at the back of the monitor, the board on the right that has all the connectors on it, one of those connectors isn't making good connection to the board, the pins need to have the solder reflowed on the back.
@@LyonsArcade Bingo! I found the bad solder on the pin as you stated. Re flowed it and game has been on a couple hrs with no problems. Now I just need to take care of the monitor humming...I can't thank you enough for the help! You saved me a headache. Thanks again!
Joe's Classic Video Games sweet! I have a umk3 in a mk2 cabinet that I'm looking to sale. But in San Antonio Texas if you go to my page I have video of it. Thanks 😊
I've seen Donkey Kong's do that... check your power supply. I think they start with that if the voltage is getting low. You should have 5volts on the board, if you're a little high (5.1) that's fine, but if you start dipping down to 4.9 or 4.8 you need to get the voltage up.
Buy an inexpensive set of monitor adjustment tools here: amzn.to/2u39J1M
Your troubleshooting is pretty well what all technicians do.
Trace the path and look for expected results.
You do such a great job on these devices.
Transistors can be tricky when they get intermittent faults.
Likely a degraded junction
Thanks Brendan we appreciate you checking all this stuff out, it's fun to figure them out, but sometimes it's major headache stuff... I'm working on a few right now like that :)
@@LyonsArcade There will always be a few that have really weird issues that are difficult to find.
I want to thank you for this video. I had an upright Asteroids that was not displaying video at all. I traced it back to this same circuit and discovered neither transistor was being turned on (so no INV and no NINV). Your explanation of the circuit helped me narrow it down to a bad resistor (R143). Now I have video. Thanks!
Very cool Darryl! We've got to figure out away to get this info out there so people in the future will be able to keep these things up and running. As i'm sure you realized when you fixed it, usually it's something so simple, one little component broken somewhere keeping it from doing it's thing. That resistor in bulk would be like a PENNY part. Really fun when you get it up and going again for a penny!
makes sense
For a change :)
Love these repair video's!! Such great detail.
Thanks Bobby Jack!
Some PCB's have an Inverter Jumper which is enabled disable with a solder blob
omg I love that cab so iconic
One of the real classics!
Lol... the way you said "It's just trippin"!
Great video as always!
Would like to get me one of these one day!
Thanks Sausage... nothing quite like Asteroids!
Joe's Classic Video Games Indeed!
This channel is awesome!
Thanks Thrift Bytes!
Hmm... Replacing the transistor worked, but the old one passes a standalone test...
Is it wrong to imagine that the solder joints just needed to be reflowed?
Could be!
I just picked one of these up for my collection. It worked fine until we moved it to the new house. Now, all the lights turn on and it hums pretty loudly. Nothing on the screen. all the lighting works. Any ideas where to start troubleshooting?
Need to look inside first and see if something came loose or fell down onto the fuses at the bottom of the cabinet, if the monitor boards are still where they're supposed to be, etc. Sounds like it might be a bad connection on the main game board to me.
@@LyonsArcade Thank you for the quick reply.I went through the connectors and could only find one disconnected. It was one of the two plugs that go into the self-test switch below the volume control.I'm trying to determine which terminal it connects to.
The player one and player two buttons blink. There is an LED lit on the PC board and also the Monitor board. There is a slight glow at the back of the monitor.There is also no sound.
I removed the main PC board connector and clean the terminals with no change.I removed all the fuses from the power supply and clean them and verified continuity. I plan to move on measuring voltages from the power supply to the mainboard.
Any other suggestions?
wow, it think it in a cocktail table instead of the upright
picture fades after a few seconds. the game is playing but i cant see anything:(
If you look at the back of the game, on the right side of the monitor there is a big plug, take that loose and clean off the pins on that board, then plug it back in. Your heater circuit on the monitor is probably not getting a good connection there.
@@LyonsArcade i disconnected the plug and the board. cleaned and reinstalled all. still no picture. i have had this game for a while. it worked fine for a few weeks, then the picture would fade more and more. now i have no picture but the game is playing. is there anything else i should look at? thank you.
The right side of my asteroid screen goes blank after about 10 minute. Any suggestions anyone? Thanks in advance
When it does that it is almost always bad solder on the monitor deflection board. Look at the back of the monitor, the board on the right that has all the connectors on it, one of those connectors isn't making good connection to the board, the pins need to have the solder reflowed on the back.
@@LyonsArcade Thank you for the quick response! I will try that and update. Thanks again!
@@LyonsArcade Bingo! I found the bad solder on the pin as you stated. Re flowed it and game has been on a couple hrs with no problems. Now I just need to take care of the monitor humming...I can't thank you enough for the help! You saved me a headache. Thanks again!
Hey Joe. Do y'all also buy arcade cabinets as well?
We do buy them, yes.
Joe's Classic Video Games sweet! I have a umk3 in a mk2 cabinet that I'm looking to sale. But in San Antonio Texas if you go to my page I have video of it. Thanks 😊
awesome video! Just a suggestion, maybe use a tri pod
I use a tripod for still shots, but I can't very well crawl inside a game and show you the chips on the board with a tripod.
My Donkey Kong does the same thing sometimes.
I've seen Donkey Kong's do that... check your power supply. I think they start with that if the voltage is getting low. You should have 5volts on the board, if you're a little high (5.1) that's fine, but if you start dipping down to 4.9 or 4.8 you need to get the voltage up.