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alexander
Joined: 05 Nov 2009
Posts: 13
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| Posted: Sat Apr 13, 2013 3:15 pm Post subject: G70 arc problem |
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hello
when i try to start the projector ,there is a loud screeching noise from the side of the blue tube and the projector doesnt start,if i try again it tries to start but i shut it down because it think there will be damage.This happened acouple of times and i left it alone.
I asked a friend who is an electrician but with not much experience with projectors,and he said its probably the high voltage leaking that creates an arc.
If it is the high voltage is there something i can do?
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fuchs
Joined: 27 Jun 2012
Posts: 153
Location: the NL
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| Posted: Sat Apr 13, 2013 3:36 pm Post subject: |
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Did you just get the projector out of damp storage?
Years ago I had a Sony 1272 or something, that spent time in a humid building.
It would indeed make that noise and also arc (flash) between the HV-blocks.
I placed it next to the central heating in my room for a couple of months and the problem was gone.
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NEC plain 9PG
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alexander
Joined: 05 Nov 2009
Posts: 13
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| Posted: Sat Apr 13, 2013 3:47 pm Post subject: |
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| fuchs wrote: | Did you just get the projector out of damp storage?
Years ago I had a Sony 1272 or something, that spent time in a humid building.
It would indeed make that noise and also arc (flash) between the HV-blocks.
I placed it next to the central heating in my room for a couple of months and the problem was gone. |
no,its in the same place its been for 10 years ,in my living room.There is some humidity there,but its always been like that.
When i tried to start it the first time it had this problem,after a couple tries,it started,and it seemed to get better after a while,when it got warm.In fact it was working ok for a few hours,with no problem.Then i shut it down and tried to start it again the next day,same thing,again the same problem.
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alexander
Joined: 05 Nov 2009
Posts: 13
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| Posted: Sat Apr 13, 2013 7:45 pm Post subject: |
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also,i forgot to mention,when i start the projector there is a whining noise,like a motor that isnt working properly.This noise goes on longer than the screeching,but eventually it stops.
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Sat Apr 13, 2013 8:21 pm Post subject: |
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10 years? Any idea how many hours the machine has on it? I'm betting the screeching are bad bearings in a fan. There are a lot of fans in a G70 - a couple at the front, a couple more in the middle between the tubes and the card cage at the rear, and another at the rear.
When you try to start the machine and it shuts down, there should be an error code that flashes up in the window at the rear of the machine. Let us know what that error code is. If it's ceiling mounted, you'll have to read it upside-down. If it's a fan, it should be an error 37, or upside-down, it should look like LE.
SC
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alexander
Joined: 05 Nov 2009
Posts: 13
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| Posted: Sat Apr 13, 2013 8:37 pm Post subject: |
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| ecrabb wrote: | 10 years? Any idea how many hours the machine has on it? I'm betting the screeching are bad bearings in a fan. There are a lot of fans in a G70 - a couple at the front, a couple more in the middle between the tubes and the card cage at the rear, and another at the rear.
When you try to start the machine and it shuts down, there should be an error code that flashes up in the window at the rear of the machine. Let us know what that error code is. If it's ceiling mounted, you'll have to read it upside-down. If it's a fan, it should be an error 37, or upside-down, it should look like LE.
SC |
hi,the projector has about 5800 hours on it.
I had to try it once ,it shut down again,the number on the back is 21.
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Phoenixed
Joined: 13 Oct 2011
Posts: 514
Location: The mitten
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| Posted: Sun Apr 14, 2013 5:55 am Post subject: |
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Abnormality of the 115v (HV) line.
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alexander
Joined: 05 Nov 2009
Posts: 13
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| Posted: Sun Apr 14, 2013 7:34 am Post subject: |
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| Phoenixed wrote: | | Abnormality of the 115v (HV) line. |
thanks.What does that mean?
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Phoenixed
Joined: 13 Oct 2011
Posts: 514
Location: The mitten
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Phoenixed
Joined: 13 Oct 2011
Posts: 514
Location: The mitten
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alexander
Joined: 05 Nov 2009
Posts: 13
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| Posted: Sun Apr 14, 2013 7:56 am Post subject: |
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seems to be the same problem with mine.Thanks for the link,i hadnt seen that.
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alexander
Joined: 05 Nov 2009
Posts: 13
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| Posted: Sun Apr 14, 2013 12:10 pm Post subject: |
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f there are 2 problems,the PA board AND the fan that ecrabb says,would i be getting 2 numbers?
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Sun Apr 14, 2013 2:34 pm Post subject: |
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| alexander wrote: | | f there are 2 problems,the PA board AND the fan that ecrabb says,would i be getting 2 numbers? |
Maybe, maybe not. The fan may be screaming, but as long as it doesn't completely stop spinning, it won't generate that error code. Most likely, with a PA board issue, you'll only see that error code. You'll probably have to send the PA board to Curt for repair. As I recall, the PA board is the most common G70 failure, and not at all unexpected with 10 years and 5800 hours on it.
SC
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Mon Apr 15, 2013 2:13 am Post subject: |
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It's also possible that the blue tube has cracked and the arc is causing the HV error.
Take the red HV lead going to the blue tube out of the splitter. Pull back the gray rubber boot, push down hard on the wire., twist and pull out. If it doesn't slide out easily, repeat until it does. There's a little lock at the bottom of the splitter, and you'll ruin the lead if you force it out.
Also disconnect the CRT socket at the end of the tube. Fire up again. See if the R and G tubes work.
I am out of town until Weds, but will troubleshoot more when I'm back.
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alexander
Joined: 05 Nov 2009
Posts: 13
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| Posted: Mon Apr 15, 2013 10:22 am Post subject: |
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| Curt Palme wrote: | It's also possible that the blue tube has cracked and the arc is causing the HV error.
Take the red HV lead going to the blue tube out of the splitter. Pull back the gray rubber boot, push down hard on the wire., twist and pull out. If it doesn't slide out easily, repeat until it does. There's a little lock at the bottom of the splitter, and you'll ruin the lead if you force it out.
Also disconnect the CRT socket at the end of the tube. Fire up again. See if the R and G tubes work.
I am out of town until Weds, but will troubleshoot more when I'm back. |
hello.
i called my friend the electrician to help me with the wiring,and we followed your instructions.We disconnected the blue tube,as you described.
We tried to fire up the projector several times,but it wont start at all.No screeching noise or any noise,it just wouldnt start.
I get an error code,now 27,which i see it says ,Polarity.My friend asked me if i may be mistaken ,about the previous error code of 21,maybe it was 27,and i didnt see it well,but even though i wear glasses(hahahaha)i'm pretty sure it was 21.
Anyway,now it says 27.What is that?
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Mon Apr 15, 2013 2:45 pm Post subject: |
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Since you have the cover off the machine, the error 27 could be legit. There's a small plastic cover just behind the lens mounts (facing the floor) that snaps on over the polarity plugs; it has a microswitch that the cover engages. If you took the lid off, you could have disturbed that cover and that microswitch could be going open. It's black plastic, about 2 inches by 6 inches or so if I remember correctly. Make sure it's nice and flush and sitting squarely where it goes on both ends.
Of course, it could also be that a board (PA board?) is throwing error messages for no good reason. It's beyond me at this point though, so Curt will have to help you diagnose when he's back in on Weds.
SC
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alexander
Joined: 05 Nov 2009
Posts: 13
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| Posted: Mon Apr 15, 2013 3:40 pm Post subject: |
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| ecrabb wrote: | Since you have the cover off the machine, the error 27 could be legit. There's a small plastic cover just behind the lens mounts (facing the floor) that snaps on over the polarity plugs; it has a microswitch that the cover engages. If you took the lid off, you could have disturbed that cover and that microswitch could be going open. It's black plastic, about 2 inches by 6 inches or so if I remember correctly. Make sure it's nice and flush and sitting squarely where it goes on both ends.
Of course, it could also be that a board (PA board?) is throwing error messages for no good reason. It's beyond me at this point though, so Curt will have to help you diagnose when he's back in on Weds.
SC |
yes,that was it.The cover you mentioned was open,i closed it and the 27 dissapeared.You solved that one,thanks.
I tried to fire up the projector and i get the screeching sound again and it shuts down,back to the original problem.The good news is that the blue tube looked fine.
But i think the main problem is the same one i originally mentioned about an arc.
i tried to start it a couple more times ,now its showing error 35.
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Phoenixed
Joined: 13 Oct 2011
Posts: 514
Location: The mitten
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alexander
Joined: 05 Nov 2009
Posts: 13
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| Posted: Tue Apr 16, 2013 9:00 am Post subject: |
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thanks.I'll wait untill Curt comes back and tells me what to do.Now,it also started throwing an error 26!!!,which says LENS,we unscrewed the lens to look at the blue tube,yesterday,but we put it back on,maybe we disrturbed something .
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Phoenixed
Joined: 13 Oct 2011
Posts: 514
Location: The mitten
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| Posted: Tue Apr 16, 2013 7:13 pm Post subject: |
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Did you double check all of your wire connections?
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Planar PD-8150/Runco LS-5
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