EagleTG
Active member
I have three of these cabinets and four of the chassis between them, and each are exhibiting monitor issues.
The monitor chassis also supplies the +5 and handles the sound (actually it looks at a glance like the sound comes from the neck board? I haven't fully traced that wiring yet...)
Anyway, does anyone have any technical information on these chassis? I know It's a real long-shot, but I thought I'd ask. This group never ceases to amaze me.
Even a list of the commonly defective (or important) capacitors (there are a TON on these boards, and they are all over the map in values and voltages).
It seems a common issue with these is blooming. I'm guessing the blooming is the biggest cap on the board, but haven't ordered any parts to test this theory. I'm sure these are exhibiting issues due to cheap Chinese capacitors, as so many other electronics in the world. One of the others is having trouble with fluctuation of the +5v supply line causing the board to lock up (monitor pulses while loading, then locks up). Another is just dead. I have one that works, but also has a severe bloom when the image on the monitor changes brightness. I did some work on one of the boards, and caused a horizontal collapse (which had nothing to do with the work I was doing, haven't checked it further). :/
I've been through a decent portion of one of the boards with my ESR meter and a DMM, and haven't really seen anything standing out as an issue.
I'm considering replacing the in-built chassis with a standard monitor chassis and throwing a Peter Chao power supply in it. I will definitely do this on at least one of them (as I'm planning on converting one of them to a JAMMA test console). It'll be a nice benchtop JAMMA cabinet.
I've been all over Google, and the forums, and really have found almost zero technical info on these guys. Thought I'd ask here if anyone knew anything more about them. If not, no biggie. I'll keep plugging along on my own.
The monitor chassis also supplies the +5 and handles the sound (actually it looks at a glance like the sound comes from the neck board? I haven't fully traced that wiring yet...)
Anyway, does anyone have any technical information on these chassis? I know It's a real long-shot, but I thought I'd ask. This group never ceases to amaze me.
It seems a common issue with these is blooming. I'm guessing the blooming is the biggest cap on the board, but haven't ordered any parts to test this theory. I'm sure these are exhibiting issues due to cheap Chinese capacitors, as so many other electronics in the world. One of the others is having trouble with fluctuation of the +5v supply line causing the board to lock up (monitor pulses while loading, then locks up). Another is just dead. I have one that works, but also has a severe bloom when the image on the monitor changes brightness. I did some work on one of the boards, and caused a horizontal collapse (which had nothing to do with the work I was doing, haven't checked it further). :/
I've been through a decent portion of one of the boards with my ESR meter and a DMM, and haven't really seen anything standing out as an issue.
I'm considering replacing the in-built chassis with a standard monitor chassis and throwing a Peter Chao power supply in it. I will definitely do this on at least one of them (as I'm planning on converting one of them to a JAMMA test console). It'll be a nice benchtop JAMMA cabinet.
I've been all over Google, and the forums, and really have found almost zero technical info on these guys. Thought I'd ask here if anyone knew anything more about them. If not, no biggie. I'll keep plugging along on my own.
