[TABLE="class: forumline, width: 100%"] [TR] [TD="class: row1, width: 100%, bgcolor: #EFEFEF"][TABLE="width: 100%"] [TR] [TD="colspan: 2"]Hey guys I started noticing that the CRT in my Sega New Astro City is starting to act strange. This cabinet was shipped to me freight from Utah, so it's possible that something happened along the way. I took a video of the jumpy video and posted it to YouTube: https://www.youtube.com/watch?v=jQqoj3ygbOc The interesting part is that once the cabinet is ON for a while the issue seems to go away. I know it could be either a cap, or possibly a cold solder joint so I took a video of the chassis : https://www.youtube.com/watch?v=7eEQqoDLuc4 Does anyone know someone in the Toronto area that is good at fixing these things? I don't mind paying for someone to come over to take a look. EDIT: Added some images of the chassis board and the neckboard: http://imgur.com/a/0CBR3 thanks![/TD] [/TR] [/TABLE] [/TD] [/TR] [TR] [/TR] [/TABLE]
You could try it yourself. Then again you might be risking suicide cause of that damn CRT. Touch any part on that circuit board and you'll be flying across the room. You may even die. But it might be a cold joint somewhere. Hell it might be on the main board which is safer by MILES.
Check these youtube vids: https://www.youtube.com/watch?v=-jbnFuVWTdk https://www.youtube.com/watch?v=bDAiLtTDuf4
Agreed. But its a pain to do so, again, risking killing yourself while doing that. Thank's to Lukemorse1 and BBISHOPPCM on Youtube for educating me on these things!
Thanks everyone. I've watched several videos now on how to safely discharge a CRT, and I feel confident that I can do it safely now. I also learned that my CRT is a Nanao MS9, but apparently there are different revisions of the board with slightly different caps.
No, unplug from the wall. Use a HV probe to discharge without removing anything. Once discharged, do your thing. See here: http://www.stickycarpet.com/pinx/md.html
You need to be careful giving advice when it involves HT circuits. It seems you don't know much about monitors. The CRT will act like a capacitor, yes - storing a charge. The LOPT is what provides it with thousands of volts, though - and that is on the main board of the chassis. If you meant the game PCB, say that. Terminology is critical. Likewise, telling people to "remember the precautions" without saying WHAT they are isn't helpful. Keep one hand in your pocket - never put both hands near the monitor as that charge will go across your heart. Unplug the cabinet to discharge - THAT IS ALL. Then use a HT probe as bad_ad said. The two screwdrivers / screwdriver and HT lead method works, but it's not the proper way to do it, you may get a surprise from the crack that you may or may not get, you won't know if the circuit is holding charge and you could potentially damage something. The best advice when you don't know anything about monitor repair is don't try it. Take it to a television repair man. It's worth checking the hold pots first, though - just remember, one hand! And if you're feeling mighty brave or mighty stupid, it could well be caps.
I know a lot about monitors. Its just i've been taught that incorrectly it seems :/ At least I learned some other ways to do it.
This is mad! No one shouldn't even try to discharged tje monitor without a trained supervisor. I don't know what else to say.
hey retrogamecabs, If you end up finding someone to do it for you let me know. I have a capcom candy cab that needs monitor work but I really don't wan to try as I will probably screw it up. =( For me it's a case of 2D games look okish but 3D stuff comes out suuuper dark. as well the rgb layers are not fully aligned anymore.
Sound like a motherboard issue. Are you positive the mobo is ok? No bulging/blown/leaking caps? is the gpu ok? Is the encoder ok?
Worst case scenario - buy a known good chassis. Unless there are enough of you with deep pockets to hire Randy Fromm to come up and train you, your best bet is one of the big arcade forums, really. There's John's Jukes (flippers.com) in Vancouver - he charges $95 per hour. If he'd even touch it - he's more pinball and old stuff.
Nope not motherboard issue. I've used the boards on my PC monitor (direct in regards to namco 2x6 games or naomi, or converter for g-net/system10 boards). The cab use to be fine in the past but after sitting around for a long time and a few long hall moves I just think the monitor is hitting it's age (the cab wasn't new when I bought it and I've had it for 13 years alone). @Assembler, Yeah I probably will end up doing that. I've just been a bit busy/lazy to start looking. =( I've also thought of buying a replacement chassis but most are for 25" units and mine is a 29" and they're becoming a bit more rare/expensive as time goes on. I think the tube it self is fine, just the pcb/ray gun need repair.
