Star Wars Trilogy 50P-GHS81 vert. deflection

SuperGunGuru

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Hey all,

Well I knew it was too good to be true. My Star Wars Trilogy projection tv/monitor developed the same problem it was said to have when I acquired it. Basically I get only a blue and green line horizontal lines across the screen. When I first got the chassis I touched up solder, specifically on the vertical deflection card and was able to get the monitor to work. My first thought is a vertical deflection failure, but being this is a different beast than what most of us work with, I may be wrong. I took a look at the 3 individual color tubes to see what was going on and noticed the green and blue were on, but not nearly as intense as you would normally see. The red tube didn't appear to be on at all. Seeing that made me wonder if it's really vertical deflection or something else. I think my blue and green might be a bit high still in terms of brightness because I had adjusted the brightness controls earlier in the week. The blue and green showed light retrace lines in test mode, but since I had already put the thing back together and accomplished the goal of getting the red turned down (it was definitely up too high) I didn't mess with it. I'm betting that's why I'm not seeing a red horizontal line. Anyway, I know these things are beasts and it may have been Cadillacman who was the only one to brave messing with these monitors because there is little to no info on them, but if anyone has any thoughts on this one I'd appreciate it. My first thought is that if it is a vertical deflection failure, I may shotgun replace that large STK chip that kinda clips onto the heat sink of the main chassis. I could also replace caps and triple check solder joints again. The only other question is what else, if anything on the chassis, controls vertical deflection? It would be really nice if it's all related to that vertical deflection card. Thanks all.
 
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Haha just a quick google search shows little about the monitor other than someone on another forum looking for a service manual and a website that has the flyback for $300! Since I'm seeing anything at all on the screen, the rule for regular CRT monitors is your flyback is working and obviously horizontal is still working. That's why logically it would still point to a vertical failure imho, but again, with these being different I don't want to just assume anything.
 
don't expect to get much help around these parts about it.

you can get a TV repair guy to scope it out, but they'll probably be dicks about it since they can't necessarily take it to the shop. be mindful that it most likely runs off 100V too, not 120V, so you can't even really adapt a plug for it, unless you have the transformer easily available.

it was a PITA on our Top Skater, I don't know the cab design for SWT.
 
don't expect to get much help around these parts about it.

you can get a TV repair guy to scope it out, but they'll probably be dicks about it since they can't necessarily take it to the shop. be mindful that it most likely runs off 100V too, not 120V, so you can't even really adapt a plug for it, unless you have the transformer easily available.

it was a PITA on our Top Skater, I don't know the cab design for SWT.
Yeah I figured help would be tough, but I've seen other discussions on projection games so I figured what the hell. There is a local repair place that I passed by, but it was closed. While checking their hours, I saw a projection tv inside so hopefully they can help me. It's not really practical to take the whole monitor section to them so who knows what they will say. Good point about the 100v vs 120v. I didn't even think about that, but if it has to be taken to those local guys and they will look at it, I'll make sure they know if it uses 100v.
 
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Well for the sake of documenting my attempt to fix this, I will keep this thread updated as I find anything out. Last night I tried to re-flow some solder and no change. My next plan is to change all caps and the large STK chip on the vertical deflection board. That will be a fairly cheap shotgun attempt. It's really shitty that there is virtually no documentation on this thing, but that will hopefully make it all the more sweet when it's fixed. :p
 
what brand monitor is yours? IIRC there were three different brands that sega used at thier leisure.



My troligy has a toshiba.. WHen i got it, the monitor was dead. I got another monitor form a top skater, gutted it, and put the guts in the trilogys monitor case..

SO i do have spare boards and parts for the toshiba monitor, but like i said it did not work at all so i have no idea whats good and bad etc..
 
Mine is a Mitsubishi 50P-GHS81. One thing I can't get over is how large the chassis is. It's definitely been interesting to work on...only have to unhook like 15 connectors to pull thing thing out. :D
 
A quick bump to this thread to post an update. I was able to find a very helpful and knowledgeable person on a tv repair forum and found the problem. I had figured it was a bad solder joint somewhere because the problem was there when I got it, it went away after I did some solder touch up, but then it came back. It turns out the bad solder joints were on the yoke connectors at the crt's themselves. It wasn't fun to remove that assembly, but after doing that at least one or two solder joints were obviously bad. All 3 yoke connections were touched up so hopefully I never have to pull that assembly again.
 
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