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Toei A292 Half Screen issue

Posted: April 5th, 2020, 6:55 am
by LWK
I have a issue with a Toei A292. It's the chassis for a MVS U4. I got this replacement chassis, I did a cap kit with what I had on hand. I got about 6 to go to have replaced them all. Color looks good, but I have the same problem this poster had. Half a screen.. viewtopic.php?f=3&t=20857&p=449396#p449396 Could it be that STK? Would replacing the remaining caps fix this issue?

Re: Toei A292 Half Screen issue

Posted: April 5th, 2020, 9:58 am
by grantspain
did you have the problem before you changed any caps?

Re: Toei A292 Half Screen issue

Posted: April 5th, 2020, 11:26 am
by LWK
I probably did. There's caps left to do. Two of the ones are 1000 uf caps. There's also this small pcb with two 47 uf's to do.. This monitor was originally running the A292s, but that chassis is gone now, I replaced it with a standard A292. I also recapped it with the kit I yanked off the failed A292s.. I've been down the road with this thing, and after years am back at it. I gave this chassis a scrub over to, and under the STK there is this slight white residue, I'm curious, could that be the cause? Not sure if that stuff could cause continuity to cause this issue. I can run over it with a tooth brush and isopropyl. Just wondering if I should bother to order the remaining caps.

Re: Toei A292 Half Screen issue

Posted: April 5th, 2020, 1:23 pm
by grantspain
carry on with replacing caps and if no change replace the ic, if i remember correctly that ic does an awful lot of work

Re: Toei A292 Half Screen issue

Posted: April 5th, 2020, 5:12 pm
by LWK
Well it isn't the end of the world. I guess I could always send it off if things don't look up. I'd love to have this cab working again.

Re: Toei A292 Half Screen issue

Posted: April 19th, 2020, 2:57 am
by LWK
I dumped my other cap kit, got a new one and installed it today. Monitor is running half screen, played a tiny bit of Xmen vs SF, and I also have that IC coming. I'll install that and see where I'm at. I have a good feeling..

Re: Toei A292 Half Screen issue

Posted: May 2nd, 2020, 7:45 am
by LWK
Gonna get another chassis and work on that.