A couple days ago it would sometimes not come on, taking the cab a couple switches off and on before the monitor would come on with it. Now the monitor never turns on. When it first started happening I figured it was a sign it needed a recap, but I don't actually know if recapping is what would help because I don't know anything. Any troubleshooting steps I should take or should I look into getting it recapped ASAP? Thanks.
- Thread starter mmmmaerk
- Start date
advans14
Professional
recapping usually has nothing to do with full on power no power issues in most cases, unless its in HV shutdown which can be other things. is this a new to you cab? are the marquee lights coming on when the monitor doesn't or is it all dead? if all dead, could be an interlock issue.
New to me. I've only had it for about a week and in that week I only really used it twice. it was the second time using it that I noticed it wouldn't come on sometimes. The marquee lights always come on.
advans14
Professional
you should always cap an import cab at least at some point, as its most likely not been done. but its also good to understand the issue before you go shotgunning. i would open the back panel and see if you hear any chirping sounds or pulsing like sounds when you flip the on switch. this would indicate some sort of hv shutdown.
advans14
Professional
could be lots of things. sometimes my speakers pop a little on my blast cause they are shitty and need replaced upon power up. what type of game are you running? sometimes different frequencies and portions of a chassis can shit out and only 15khz will work etc.
DelsArcade
Enthusiast
Could also be a flyback issue. DIscharge the monitor and then you can safely search for cracks, etc. on the flyback itself. Also did you check the fuses on the chassis?
ASAP = Always Start At Power. Take a multimeter to the monitor's AC inputs. What's it reading?
Del
ASAP = Always Start At Power. Take a multimeter to the monitor's AC inputs. What's it reading?
Del
Honestly with a 2931 chassis, I would just send it to someone who knows how to fix it. It’s a known problematic chassis and very difficult to troubleshoot.
If you have never done any CRT monitor work, this is not the chassis to start on imo. It’s the reason why people suggest not getting a blast city as your first cabinet.
If you have never done any CRT monitor work, this is not the chassis to start on imo. It’s the reason why people suggest not getting a blast city as your first cabinet.
advans14
Professional
the blast city is boss. the reason why they recommend not getting one is they want them for themselves and are greedy candy bros. it aint any worse than any other monitor or cab, the 2930 is rock solid and so are the latter revisions. sure the 2931 has quirks but if its maintained, it going to be good as any other. think of the import cab and how long its been thriving in arcades before we get em. maintenance needs done period, regardless of the monitor or cab all caps are out of spec and things will start shitting.
Hatsune Mike
Champion
Pop out the fuse F701 near the flyback, and this'll let it run without HV (the flyback). If it's "running" (that is, the relays click, and you can faintly hear the deflection on the yoke) then it's happy other than the HV. If that's the case then you know to work on the HV side which is isolated from the rest. Start by seeing if the MOSFET (Q701) that drives the flyback is toast.
Otherwise, move on to the horizontal section. Try Q511, D511, and Q952.
Otherwise, move on to the horizontal section. Try Q511, D511, and Q952.
Hatsune Mike
Champion
The 2930 is extremely not rock solid. The HV circuit on the 2930 and 2931 is infamous for having explicit and unique failure modes. The things that make it this way seem to have virtually nothing to do with maintenance. Never mind the tube itself having a pretty bad rate of developing poor emissions. Even here in Japan Blasts are the most difficult to service and keep working and many get gutted and discarded for good reasons.
I love the Blast when it's working and have owned and restored many of them, but the surface of what can go wrong and how difficult or expensive it is to fix it is nearly one of the worst among any mass-produced cabinet in this form factor. Capacitors are baby time stuff and are not even the surface.
Hatsune Mike
Champion
Try without HV and then attacking the horizontal section if they still go into protection.
Hackcell
Grand Master
What do you mean, disconnect the high voltage section to see if it powers on?
GeekMan1222
Grand Master
Man
Also chirping can sometimes generally be assumed as a power supply issues sometimes (at least to my understanding) The power supply is trying to cycle up and cant do it fully because of something in the power supply or something later down the line causing issues that cause the PSU to shutdown and restart if you will. (at least this is some of my understanding).
The 2930 and 2931 are alot different compared to many other monitor chassis's.
Nanao didnt truly revise most of the chassis until really the 2933 (a larger revision to the 2931) where they started using a different flyback and a different HV Regulation daughter board to go with that.
If your trying to get your hands dirty then first step is check your B+ voltage and HV (if you have the meter for that) tbh but if you get no neck glow and or cant hear the deflection running its likely entering a shutdown situation (of which theres a number of different reasons that can trigger)
Take the chassis out inspect for bad solders. The MS2930 I seen alot where they get some cold solder joints in the primary power supply and a few other areas. Touch up any bad solders.
You should check the HOT for shorts, and the Mosfet by the Flyback because the HOT alone does not drive the flyback on this chassis.
(would follow the steps moffet mentioned because isolating the HV and Horizontal Output Stages is a really good way to narrow stuff down (theres alot of stuff going on).
Best of luck.
Man this is some good troubleshooting tips right here.
Also chirping can sometimes generally be assumed as a power supply issues sometimes (at least to my understanding) The power supply is trying to cycle up and cant do it fully because of something in the power supply or something later down the line causing issues that cause the PSU to shutdown and restart if you will. (at least this is some of my understanding).
The 2930 and 2931 are alot different compared to many other monitor chassis's.
Nanao didnt truly revise most of the chassis until really the 2933 (a larger revision to the 2931) where they started using a different flyback and a different HV Regulation daughter board to go with that.
If your trying to get your hands dirty then first step is check your B+ voltage and HV (if you have the meter for that) tbh but if you get no neck glow and or cant hear the deflection running its likely entering a shutdown situation (of which theres a number of different reasons that can trigger)
Take the chassis out inspect for bad solders. The MS2930 I seen alot where they get some cold solder joints in the primary power supply and a few other areas. Touch up any bad solders.
You should check the HOT for shorts, and the Mosfet by the Flyback because the HOT alone does not drive the flyback on this chassis.
(would follow the steps moffet mentioned because isolating the HV and Horizontal Output Stages is a really good way to narrow stuff down (theres alot of stuff going on).
Best of luck.
advans14
Professional
yeah caps can be assumed baby time, but you can't expect it to be run optimally and it's the bare minimum on any monitor thats 25+ years old. i love all games when they're working, its just how it is with cabs (candy or not).
Hatsune Mike
Champion
F701 is socketed (near the flyback) so if you take it out it disables the HV circuit. You can do this and determine in which neighborhood the problem lies and go from there.
So I had a guy come look at it today. Here is my chassis.
He insisted that I should just put a flat screen monitor in there, but obviously I rejected that idea every time. Should I look for another flyback or another chassis entirely?
He insisted that I should just put a flat screen monitor in there, but obviously I rejected that idea every time. Should I look for another flyback or another chassis entirely?
