| Author |
Message |
fattmann
Joined: 04 Jun 2016
Posts: 6
|
| Posted: Sat Jun 04, 2016 12:46 am Post subject: Sony 1252Q HV block arcing- salvageable? |
|
|
I have a Sony 1252Q that I got free a few years back, been rocking it at 720p for a long while. I have always had a weird alignment issue, but it has worked pretty damned well for me.
I went to turn it on the other day, and noticed it making a bit more noise than normal. I happen to have had the cover off to refocus it, looked up, and there was a blue haze around the front most red wire in the photo, right where it meets the gray boot.
http://i.imgur.com/OSkGQJT.jpg
I freaked. Turned it off, unplugged it, and hit the power button a few times to try and clear the caps. I let it sit for a day to think about it. Then I remember that that wire had come loose about 3, maybe 4 years ago. I don't think it was supposed to have come off, but i got it pushed back in and never had another problem till now. After it was off for a night I gently pulled on that wire and it came off with little resistance. There was a nub of a wire sticking off the end that was bent and a little oxidized. I hit it with a little piece of sandpaper to clean it up, straightened it, and put it back in- just as I had all those years ago.
Plugged it back in, crossed my fingers- NOPE! Arced even harder and arced across itself to the black portion (notice the spot with no dust). I pulled the plug promptly and here I am.
From what I gather that is one of the HV transformers. Is that replaceable, or even safe to replace? Would I just need to get a whole new power supply?
I know the 1252 isn't a glamorous projo, but it feels like my mutt of a pet and I'd like to salvage it. Although I definitely understand it's not worth dumping money into.
Looking for thoughts and suggestions. Any info is appreciated. Thanks![/img]
| Description: |
|
| Filesize: |
127.08 KB |
| Viewed: |
12410 Time(s) |
|
|
|
| Back to top |
|
 |
Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
|
| Posted: Sat Jun 04, 2016 1:17 am Post subject: |
|
|
|
I probably have a spare for cheap.. Email me at curtpalme at shaw.ca
|
|
| Back to top |
|
|
Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
|
| Posted: Sat Jun 04, 2016 1:24 am Post subject: |
|
|
|
Can you send that email again? The last one came in, I clicked on it, and it disappeared!
|
|
| Back to top |
|
|
fattmann
Joined: 04 Jun 2016
Posts: 6
|
| Posted: Sat Jun 04, 2016 1:25 am Post subject: |
|
|
| Curt Palme wrote: | | Can you send that email again? The last one came in, I clicked on it, and it disappeared! |
No problem- Sent!
|
|
| Back to top |
|
|
fattmann
Joined: 04 Jun 2016
Posts: 6
|
| Posted: Tue Jun 21, 2016 11:49 pm Post subject: |
|
|
I finally managed to get the power supply out, and snap a few more picture of the part with the issue. All the pictures can be found here: http://imgur.com/a/HFLPu
Curt said he didn't have the part I need before, maybe some of these pictures will make one appear  . Didn't know if reviving this thread one or starting a new thread would be best, so I'll start here.
I looks like the part I need is the Flyback Transformer Assembly (NX-2500) 1-439-466-12, as per the exploded diagram from the service manual in the downloads page. Curiously the label on mine has 1-453-160-12 on it. I'm assuming the one in the service manual is for the 127x series (as listed at the top of the pages of the pdf), and mine has a different part number because it's a 125x series?
Also in that picture album are shots of the end of the wire that is the cause of all this. Originally I didn't think those were ever supposed to come out, and that's what went wrong when it got pulled out all those years ago. But if that's the case how are you supposed to swap that transformer? Maybe there is a trick to re-stripping the end of the wire and getting it back in there?
I've done plenty of low voltage stuff, so I'm savvy with cutting, stripping, soldering and all that- but this high voltage stuff scares the hell out of me. I don't want to start cutting and stripping anything without some insight.
If I do need to replace that transformer, or the whole board it's on, and Curt doesn't have one, suggestions on where else to find one? I'm striking out with generic google and ebay searches.
Any info is appreciated!
|
|
| Back to top |
|
|
AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
|
| Posted: Wed Jun 22, 2016 2:48 am Post subject: |
|
|
Those red wires will come out. You just need to push and turn - hard.
Where's the picture of the damaged wire?
_________________
Tech support for nothing
CRT.
HD done right!
|
|
| Back to top |
|
|
fattmann
Joined: 04 Jun 2016
Posts: 6
|
| Posted: Wed Jun 22, 2016 2:56 am Post subject: |
|
|
| AnalogRocks wrote: | Those red wires will come out. You just need to push and turn - hard.
Where's the picture of the damaged wire? |
My apology, it didn't get transferred to the album. Should be in there now. I had pushed it back in years ago and was good to go for a long while. After the first set of arcing the other day I tried to reseat it, and only made it worse.
|
|
| Back to top |
|
|
AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
|
| Posted: Wed Jun 22, 2016 3:02 am Post subject: |
|
|
Looks like you lost the end cap off that wire. Is it still in the bottom of the block? You can re-solder those
_________________
Tech support for nothing
CRT.
HD done right!
|
|
| Back to top |
|
|
fattmann
Joined: 04 Jun 2016
Posts: 6
|
| Posted: Wed Jun 22, 2016 3:07 am Post subject: |
|
|
| AnalogRocks wrote: | | Looks like you lost the end cap off that wire. Is it still in the bottom of the block? You can re-solder those |
Interesting. I'll have to check tomorrow, it was like that the first time as well. Is it safe to try and dig that out? Will I need to discharge the module at all? There was some serious current coming out that sucker (as seen by the black csrbonized dust on the wire casing in one of the pictures). It has been powered off for a few weeks now.
|
|
| Back to top |
|
|
AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
|
| Posted: Wed Jun 22, 2016 3:16 am Post subject: |
|
|
| fattmann wrote: | | AnalogRocks wrote: | | Looks like you lost the end cap off that wire. Is it still in the bottom of the block? You can re-solder those |
Interesting. I'll have to check tomorrow, it was like that the first time as well. Is it safe to try and dig that out? Will I need to discharge the module at all? There was some serious current coming out that sucker (as seen by the black csrbonized dust on the wire casing in one of the pictures). It has been powered off for a few weeks now. |
If you are worried about it you can do this: Plug the projector into the mains AC and leave the main power switch on the front of the projector off. Take a screw driver and a piece of wire and wrap the metal shaft of the screw driver with the wire and run the other end to a chassis ground on the projector. Then stick it in the hole for the HV lead.
This is likely overkill though. I remember someone saying the HV is discharged after 45 seconds or there abouts. BUT if there is a charge left it will fo up the screw driver shaft, across the wire to the chassis and out the ground wire to you AC outlet in the wall.
_________________
Tech support for nothing
CRT.
HD done right!
|
|
| Back to top |
|
|
fattmann
Joined: 04 Jun 2016
Posts: 6
|
| Posted: Thu Jun 30, 2016 4:07 pm Post subject: |
|
|
| AnalogRocks wrote: | | Looks like you lost the end cap off that wire. Is it still in the bottom of the block? You can re-solder those |
Nope. There doesn't appear to be any plug stuck in the socket. I even pulled on the second transformer, and yanked the wire out and it looks the same (http://i.imgur.com/Mtkqveq.jpg), so I think I may have just toasted the other one if there is no way to get that back in there securely  .
If there is a plug end in there, I can't tell on either socket, and see no way of digging anything out with how deep it is. Thoughts? I can't find any documentation that those wires are supposed to come out.
So it looks like I'm back to needing that whole board with both transformers, of which I cannot find a source.
|
|
| Back to top |
|
|
cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
|
| Posted: Thu Jun 30, 2016 4:43 pm Post subject: |
|
|
|
Curt, or Craig, do you think the PB boards from a G90 will work? They look the same, and the part numbers from the transformers is 1-453-160-13. Those LOOK the same, otherwise. Maybe the voltage ratings are slightly different? I don't know.
|
|
| Back to top |
|
|
Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
|
| Posted: Thu Jun 30, 2016 4:51 pm Post subject: |
|
|
|
I've never checked, sorry! Sony is pretty specific with part numbers, so if the G90 part number on the transformer is the same, then I'd say it's do-able. I have a feeling they are different though, as the 1252 series used a separate thin wire for the G2 voltage, whereas the G90 had that generated on a different PC board. Surely SOMEONE here has a junk 12XX series sitting in their basement somewhere?
|
|
| Back to top |
|
|
|
|
