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tony359
Joined: 04 Aug 2006
Posts: 378
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| Posted: Sat Sep 06, 2008 9:16 am Post subject: Sony 1272 error C3 |
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Hi guys
What the hell means error C3 on a 1272? It is not listed in the error code on service manual...
The CRT starts and shuts down almost immediately only if a picture is displayed. If I left it running with no signal, or with a low brightness signal like a DVD menu it stays on forever...
Thanks
Antonio
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Arno P
Joined: 01 Jan 2007
Posts: 282
Location: The Netherlands
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| Posted: Sat Sep 06, 2008 9:32 am Post subject: |
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I can't find C3...but if it is 03 it might be a fan stop....check if all fans are working during start up
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tony359
Joined: 04 Aug 2006
Posts: 378
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| Posted: Sat Sep 06, 2008 9:43 am Post subject: |
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The CRT is not mine, but my friend is sure it's C3, the CRT is not on ceiling, so no inverted code 
Perhaps a bad indicator (some legs miss?)
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speedyandre
Joined: 18 Dec 2006
Posts: 291
Location: Netherlands
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| Posted: Sat Sep 06, 2008 11:21 am Post subject: |
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If it is a fan failure it shuts down immediately, or the fan failure must occure some later.
Can you see some other failures flashing before the c3 comes?
On my 1292 I had a sequence of failures on the display but after all it starts up fine.
André
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tony359
Joined: 04 Aug 2006
Posts: 378
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| Posted: Sat Sep 06, 2008 11:28 am Post subject: |
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No, if you push PAGE immediately and turn off the white warming page the set stays on forever, so no FAN issue.
I was told that if you run a DVD menu it's ok, if you run a movie the picture starts to show some issue and then shuts down with C3.
Yes, I should describe what kind o picture issue, I'll ask better and I'll post here something better soon!
Thanks!!
Ciao
Antonio
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speedyandre
Joined: 18 Dec 2006
Posts: 291
Location: Netherlands
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| Posted: Sat Sep 06, 2008 11:40 am Post subject: |
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So then you could say that it looks like a powersupply failure, because a full white draws full power and a static dvd menu is darker.
Maybe one of the cables on the PS boards (PA or the smaller one) is loose or one of the big boards on top (with the blue capacitors) has some issues.
I think you could start with reseating all the cables and maybe inspect the top boards for bad solder joints.
André
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tony359
Joined: 04 Aug 2006
Posts: 378
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| Posted: Sat Sep 06, 2008 11:55 am Post subject: |
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Yes, that's aexactly what I told to my friend.
What I miss is why the error code is not listed on the service manual...
Ciao
A
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Sep 06, 2008 3:35 pm Post subject: |
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Aside from the error code, your description sounds like the IK protection circuit. Various issues can trigger this circuit. I would first check G2 using the guide in the manual.
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tony359
Joined: 04 Aug 2006
Posts: 378
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| Posted: Sat Sep 06, 2008 7:28 pm Post subject: |
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Thanks, we'll do it.
Ciao
Antonio
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tony359
Joined: 04 Aug 2006
Posts: 378
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Sep 07, 2008 9:46 pm Post subject: |
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What were the voltages that you set G2 at? Still looks like an IK shutdown issue. If you reset G2 properly and its still doing it then could be a neckboard (try disconnecting one at a time and see if it shutsdown), could be a tube.
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tony359
Joined: 04 Aug 2006
Posts: 378
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| Posted: Sun Sep 07, 2008 9:57 pm Post subject: |
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I'll tell him to check G2. Can the set be run without neckboard safetly? Just disconnecting them?
Ciao
Antonio
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Sep 07, 2008 10:40 pm Post subject: |
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The neckboard itself doesn't really have much on it but by disconnecting one at a time should eliminate a tube problem. Most of the video processing and IK detection is on the video out board. I would also suggest that you try turning off ABL if you can get a menu up.
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tony359
Joined: 04 Aug 2006
Posts: 378
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| Posted: Sun Sep 07, 2008 10:56 pm Post subject: |
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Yes I can get the menu but do you mean AKB? It cannot be disabled by menu, only by jumper.
Thanks for youe help, ciao
Antonio
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Sep 07, 2008 11:23 pm Post subject: |
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| tony359 wrote: | Yes I can get the menu but do you mean AKB? It cannot be disabled by menu, only by jumper.
Thanks for youe help, ciao
Antonio |
No, I meant ABL (auto brightness limiter). I saw the circuitry for it on the video board schematic and figured you could shut it off because many displays will allow it. But I checked your manual and your correct there is not a selection for it. However I did see a setting in there for clamp and you should check it to make sure its on auto, Also I would double check the bias and gain settings to make sure none of them got cranked up. Plus the other suggestions I posted, especially the G2.
Do you have a method for adjusting the G2 on this 1272?
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tony359
Joined: 04 Aug 2006
Posts: 378
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| Posted: Sun Sep 07, 2008 11:30 pm Post subject: |
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Ah, ok. No, it can be disabled, you're right.
Thanks for the clamp suggestion. here's the BIAS and GAIN, but I think it's useless, each set has its values. However, they're not cranked.
I'll have my friend to reset the G2, but I understood that the set was working before it was moved, so I'll have him reseat everything before touching it.
Yes, I have a method, I posted it somwhere, if you make a search you can find it.
My only "customization" is to set the gain and bias to 128 before start since the manual says to set them to the factory default but on the service manual there is no explanation on how this default is made
Ciao
Antonio
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tony359
Joined: 04 Aug 2006
Posts: 378
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| Posted: Mon Sep 08, 2008 12:32 am Post subject: |
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Ok, if we turn off the GREEN by remote, the set works properly.
Now what? I cannot swap neckboards between tubes because of short cable.
Correct me if I'm wrong:
1. Disconnect neckboard from green and turn on the set with neckboard disconnected: this will tell us if the tube is shorted.
2. Swap RCA input cable of video boards between blue and green: this will tell us if the fault is before or after
Thanks!
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Sep 08, 2008 12:49 am Post subject: |
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You can give it a try but swapping the cables is not conclusive. The drive and background for each color come in on a different line. But see what happens, but be specific of what you find.
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tony359
Joined: 04 Aug 2006
Posts: 378
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| Posted: Mon Sep 08, 2008 10:45 am Post subject: |
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I'll try but the projector is not mine and I'm reporting what a friend is reporting me
I'll let you know!
Ciao
Antonio
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