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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Thu May 22, 2008 10:46 pm Post subject: HELP! HV ARC has just started to kill my Sony G520P monitor. |
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10 seconds ago I heard a *SNAP* from the monitor. IT's a 2002 model 22nd week manufacturer. Now the screen's twitching and it's giving me morse code. HELP! I love this CRT. What should I look for first?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri May 23, 2008 12:15 am Post subject: |
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Check the insulator on the Horizontal output transistor. Also look for any burn marks there and around the flyback, top and bottom of the board.
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outwest
Joined: 17 Dec 2006
Posts: 212
Location: Honolulu
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| Posted: Fri May 23, 2008 5:43 pm Post subject: |
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AR
When I was spending some time on big Mitsubishi monitors liberated from Gov Liq, I had two monitors that would produce a loud sharp snap. The arc was from one of the pin connectors on the neckboard to a fairly heavy wire that bridged across the picture tube connectors about 3/8" away. This wire bridge was connected to chassis ground by a flat, braided strap. I looked around on the internet and I think this feature was called a "safety gap". It was to protect the picture tube from excessively high, high voltage. Changing the flyback transformer fixed the problem in both cases.
This advice is likely worth what you paid for it.
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Fri May 23, 2008 11:42 pm Post subject: |
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| outwest wrote: | AR
When I was spending some time on big Mitsubishi monitors liberated from Gov Liq, I had two monitors that would produce a loud sharp snap. The arc was from one of the pin connectors on the neckboard to a fairly heavy wire that bridged across the picture tube connectors about 3/8" away. This wire bridge was connected to chassis ground by a flat, braided strap. I looked around on the internet and I think this feature was called a "safety gap". It was to protect the picture tube from excessively high, high voltage. Changing the flyback transformer fixed the problem in both cases.
This advice is likely worth what you paid for it. |
Well after about 25 minutes last night it stoped the morse code beeping ( resonation? ) The picture stabilized and only has an ocasional hic-up. I was outta time last night to open it up. I hope to get to it on Sunday time permitting.
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Fri May 23, 2008 11:43 pm Post subject: |
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| macgyver655 wrote: | | Check the insulator on the Horizontal output transistor. Also look for any burn marks there and around the flyback, top and bottom of the board. |
Thanks I'll take some pic's when I open it up.
Still breathing the solder smoke over there Mac?
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AnalogRocks
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Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Wed May 28, 2008 5:46 am Post subject: |
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I 'uninstalled' that heavy beast last night and put my Princetong Graphics Ultra 95 back in its place. I forgot how good the PG monitor looked.
I'm going to open it up tomorow night. Time permitting as always.
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Fri Jun 20, 2008 12:39 am Post subject: |
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| AnalogRocks wrote: | I 'uninstalled' that heavy beast last night and put my Princetong Graphics Ultra 95 back in its place. I forgot how good the PG monitor looked.
I'm going to open it up tomorow night. Time permitting as always. |
Well tomorow night finaly came. How do you get the case off this beat without butchuring it? I removed the only 3 screws I could see. There are 2 case interlocks towards the top on the sides of the case. I depresed them ( with a screw driver not with digital stories ) but the case won't budge. How does this come apart?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jun 20, 2008 1:37 am Post subject: |
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Didn't I send you a manual for that?
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Fri Jun 20, 2008 1:48 am Post subject: |
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Just the user's manual.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jun 20, 2008 1:54 am Post subject: |
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I think I have the service manual for that model. I'll look tomorrow.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jun 20, 2008 2:15 am Post subject: |
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Manual is in your email. It should be the right one. If not let me know. I have lots more.
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Fri Jun 20, 2008 6:04 pm Post subject: |
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It's the right one Mac thanks.
Don't know when I'll get back to it though. SO many things to do.....
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