It's been a while since I've posted, which is mostly because things have been going fine. But tonight, my Dwin 700 bit the cookie and I need help. Has anyone seen this problem before?

It was playing fine for about an hour. Then there was a sound like a steak being thrown on a hot grill and it turned off. I pulled off the covers, and turned it on again. It played fine for five minutes, then the same thing. I could see some arcing somewhere above the blue tube, but I can't be sure where it was, and I don't want to repeat.

Any suggestions for a self-inflicted fix, or does it need to go back to Dwin. Is there any service available on the east coast? Any help appreciated.

My HD-700 is going back to Dwin. Dwin won't release tech specs, diagrams or part info. So its a guessing game for anyone else to fix it. I've been tryin' to get mine fixed the past don't ask how long but it just ain't workin'. Back to Dwin is the easiest, most assured way to get back up. I just realized that myself.

Curt Palme has had a non-working HD-700 for a long time now. He can't fix it thanks to Dwin not sharing tech info. What does that tell ya?

Well, some progress.

I removed the covers and fired it up again. It arced directly above the blue lens, and died again. That pretty much pinpointed the problem as the high voltage supply.

This morning, I removed the power supply. Careful inspection failed to reveal anything that looked burned or blasted, and the two fuses were intact. With no better idea, I removed the flyback and went over it with a cotton swab to remove accumulated dust. When I reinstalled, I made sure that the high voltage leads weren't too near any sheet metal, especially points and edges. One of the leads had been literally wrapped around a sharp edge, and that's my prime suspect. It's been working now for half an hour. If it's not completely 100% fixed, its certainly an improvement over last night.

Now that I am sure where the problem is, the question remains as to a long term fix. I gather that you can't go into radio shack and buy a new flyback. While I contemplate what to do, I may install some loose shrink wrap on the HV leads. That way, if it arcs again, a deformed bit of shrink wrapped may be the tell tale.

(Aside: I was surprised to find that there's a third fan inside the power supply. When I bought this unit, I thought the DWIN's were fanless. Then I noticed the two fans inside the case, now this one.)

Curt Palme has had a non-working HD-700 for a long time now. He can't fix it thanks to Dwin not sharing tech info. What does that tell ya?


How about just that I haven't had time to dive back into it? :D

I emailed mFrank back this AM. I offered for him to send me his power supply to test in my unit here. Mike Parker has repaired some of these units successfully, or as you say, DWIN will repair the set at a reasonable price.

Watched for 3 hours last night, and the problem is definitely gone. I doubt the leak was through the side of the flyback. I think that rerouting the HV cable that wrapped around the edge was what fixed it.

Another thing: this projector has always had a mild snap, crackle, pop. Other Dwin owners have reported similar noise, so I never gave it a thought. Well, that minor annoyance is now much reduced. I'm beginning to think that the flyback or cabling has been leaky from day one. I'm definitely going to go back in and sleeve the high voltage cables. I wonder if there's somewhere you can buy cable and terminators for the HV links.

Thanks to Curt for his kind offer. I hope I don't have to take him up on it.

It's been a while since I've posted, which is mostly because things have been going fine. But tonight, my Dwin 700 bit the cookie and I need help. Has anyone seen this problem before?

It was playing fine for about an hour. Then there was a sound like a steak being thrown on a hot grill and it turned off. I pulled off the covers, and turned it on again. It played fine for five minutes, then the same thing. I could see some arcing somewhere above the blue tube, but I can't be sure where it was, and I don't want to repeat.

Any suggestions for a self-inflicted fix, or does it need to go back to Dwin. Is there any service available on the east coast? Any help appreciated.


You probably have the same problem I had,
The white high voltage focus connector may be
arcing near the power supply.
It's a simple fix, just twenty minutes
and about two four inch pieces of shrink tube.

I'll post pictures of the fix that worked for me.


Continued arcing will eventually blow the output
so it's imperative to correct the problem ASAP!

Good post, anode. Yes, that seems to be the culprit. On mine, the cable was tightly folded around the edge of the sheet metal housing, which is where I think it was leaking. I'm going to take it apart again as soon as I can get hold of some shrink wrap. But I'm also thinking about making a nylon standoff to keep it away from the edge.

My HD700 works fine and yes I do hear the normal crackeling sounds that all the DWINS I have have seen do.

So your saying yours doesnt crackel as much now since you fixed it? HMMM

well Dwin isn't the first company to route their wires poorly. There's a Marquee tech bulletin that talks about re-arranging the yoke leads to the Green tube to reduce "crowding" and it also moves them futher away from the splitter block.
Also, any soot build-up on the HV leads should be cleaned off because that stuff is super conductive being basically ionized Carbon. A towel sprayed with a little Windex works really well here.

Vic, the quiet crackling from your HD700 is normal HV-type sounds. An arc like in 2ndAnode's pix would be MUCH louder.