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Wells Gardner D9200 - Horizontal Collapse?
Rocketeer2001:
I got all the parts last Thursday...except for that one resistor, which shipped separately and didn't arrive until today. Put all 3 parts in and...still broken :(
It did behave differently this time though. I had the game board disconnected from the monitor so that I could see if the "no signal" appeared on the screen first before trying to boot up anything else. When I turned on the power, there was a sizzle of high voltage going to the CRT, so that was good, but then the chassis board starting making a quickly repeating clicking sound, similar to a geiger counter. There was also the normal clicking of a relay that I heard before, but still no image on the screen.
I turned it off, then reconnected the game board to see if having a signal would make a difference. Turned it back on and the sizzle, clicks, and relay clicks were there again, but this time the geiger counter clicks got quieter and the relay clicks got slower. Sure enough, there was an image trying to form on the screen, but it was all garbled with micro-seconds of dim clarity of the "no signal" image.
*EDIT* The neck was also glowing, so I assume that means it's getting enough power to run the tube, but just isn't getting a good video signal.
Then there was a loud BANG and I saw a spark at the neck board. I shut everything down, let it cool down for a few minutes then took the neck board off to see if any components exploded. They all looked visually fine; I think it was just a grounding discharge. Not sure why that would happen.
The new clicking sound was coming from the same corner of the board that all the horizontal collapse components failed around.
The spark on the neck board was just left of the neck if you're looking at the back of the board.
I haven't taken anything else out to inspect. Getting a little tired of this monitor. Although, it's technically no longer horizontally collapsing, so I guess that's a win. It's just fritzing in all directions now.
I will now open the floor to any questions and suggestions for the next course of action.
grantspain:
was the bang noise more of a heavy crack noise?
I imagine you remembered to connect the neck card dag earth?
I can't remember if q414 original was a irfs644 or irf644, the latter would require a insulation sheet
Rocketeer2001:
Yeah, it was more of a snap. Like a quick arc. I did have all the grounds connected so it was a bit surprising if the neck board is trying to arc to ground. It only happened once within 30 seconds of powering on.
Q414 is just a little guy. Like an NPN transistor, so no insulation sheet.
I've been doing some searches online and the common culprit for repetitive ticking noises is the HOT or the flyback dying. I've already replaced the HOT...twice, so is it maybe the flyback? I should probably remove the HOT again and check it to see if it got fried, yet again.
lilshawn:
it's not uncommon for the main B+ supply to act weird due to a bad feedback capacitors. changing out C413 C314 could stop it from doing the ticking thing.
faint ticking/buzzing with no power and acting "dead" can be a sign that the SMPS controller chip (U802) thinks there is an overload condition and will continually attempt to restart the power supply. it will also sometimes work just fine... then other times it won't want to start again.
if you heard/saw an electrical arc on the neck board... check the resistors. they can look okay on the top side, but if you look carefully at the side of the resistors that is up against the circuit board, you can sometimes find one blown out.
while i wouldn't discount the idea of a failing flyback... you never know with these things. the D9200 D9400 series monitors where an absolute engineers wet dream. they did all the crazy things they thought was a good idea and the next big thing since sliced bread... and sadly... many of them aren't... it just makes 10x the amount of things that can go wrong.
Rocketeer2001:
I'll give those capacitors a look this weekend. It doesn't seem to be a power issue though, because the neck tube was glowing the whole time, it just wasn't showing a proper image.
I'm wondering if maybe the chassis board is fine, and my issue is actually with the neck board or the video/sync board, because the slight blips of images I got on the screen were of the "no signal" message, but I had the game board hooked up and running, so I should have been seeing blips of the game and not the "no signal". Perhaps the video signal isn't making it to the chassis board?
The neck board and the sync board admittedly don't look fantastic; almost like they might have been exposed to some water damage in the past. Maybe I'll try reflowing all the solder joints on those two boards and see how that pans out. I'll check for burnt resistors too.
If that doesn't pan out, what is everyone's thoughts on just turfing this stupid monitor and using a CRT TV as the monitor? I've been reading up on how to do RGB mods to commercial TV's, and it doesn't seem that difficult compared to trying to track down the issue with this D9200. So far I've spent $75 trying to make this damn thing work, and I know I can't find a genuine replacement arcade monitor for less than $400, yet I can
find an old TV with few miles on it with no image burn-in for next to free on kijiji, and then spend a few dollars on the couple components needed to mod it.