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winny
Joined: 09 Oct 2013
Posts: 403
Location: Sweden
TV/Projector: BD808s, BG1209/2
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| Posted: Tue Oct 22, 2013 9:29 pm Post subject: Flash + loud bang from BD808s |
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So I had just hooked up my popcorn hour (since my HTPC MB just died) via a HD fury to my BD808s and looked forward to enjoy my first movie on my new projector. Let the projector heat up while I was in the kitchen cooking. All of the sudden I see a blue flash from the living room and a loud BANG! Sounded expensive... I rushed over to unplug the projector but noticed that the picture was fine on the screen before I got hold of the cord. Perhaps something not in use, like the IRIS or an input not in use, but this didn't made any sense. I let it discharge for 30 minutes and then opened it to find this:
Burn mark.
High voltage.
Gap.
The high voltage had jumped to the chassis which shows as a mark but my fingerprints really stands out in a picture taken with a flash. Point of impact was the cable itself which is strange from the state of it (looks solid). The only concern is that the cap/connector of the HV lead is not fully inserted, but this is several cm away from the burn mark.
My experience with high voltage is limited to doing calculations on HV transmission lines in school and verifying EN60335 (CE mark) compliance by shooting HV ESD, HV surge and HV burst on our products and remembering to have one hand in my pocket while doing so.
Any suggested course of action? Replace the HV lead? Isolate the chassis with Mylar/bo-PET?
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winny
Joined: 09 Oct 2013
Posts: 403
Location: Sweden
TV/Projector: BD808s, BG1209/2
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| Posted: Wed Oct 23, 2013 10:25 pm Post subject: |
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Hmm, no replies.
I did a temporary workaround consisting of a thick sheet of Mylar, good for tens of kV, and some heat shrink tube.
This HV lead runs throughout the projector and if there would be a flashover against a PCB, I will not be so lucky the next time. What recommendations are there for replacements?
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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: Wed Oct 23, 2013 11:38 pm Post subject: |
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Generally you would sleeve the HV lead with a clear tubing. If you suspect it's leaking at the end you could add silicone too.
Here's a picture of the HV lead from my Ampro 4000:
http://www.curtpalme.com/forum/album_page.php?pic_id=297
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Thu Oct 24, 2013 1:21 am Post subject: |
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Im pretty suprized there is no plastic sleave on that lead too...
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winny
Joined: 09 Oct 2013
Posts: 403
Location: Sweden
TV/Projector: BD808s, BG1209/2
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| Posted: Thu Oct 24, 2013 8:34 am Post subject: |
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That looks like clear heat shrink tube.
Is the entire length of the cable tubed like this?
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Thu Oct 24, 2013 8:54 am Post subject: |
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Were you swinging from the roof when you took the pictures. 
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winny
Joined: 09 Oct 2013
Posts: 403
Location: Sweden
TV/Projector: BD808s, BG1209/2
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| Posted: Thu Oct 24, 2013 9:14 am Post subject: |
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| km987654 wrote: | | Were you swinging from the roof when you took the pictures. |
Pardon?
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Thu Oct 24, 2013 11:09 am Post subject: |
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| winny wrote: |
That looks like clear heat shrink tube.
Is the entire length of the cable tubed like this? |
No its more like vinyl tubing, youd have to get it very hot to shrink it.
| winny wrote: | | km987654 wrote: | | Were you swinging from the roof when you took the pictures. |
Pardon? |
He is just having a joke mate, don't worry about him 
_________________
Barco Cine 9, ,Sony VPL570ES 4K SXRD, 135" OZ Theatre Majestic 16:9 screen, Denon X6700in preamp mode, 2x 7ch Tonewinner amps, 2x Tonewinner 15" subs, 2x 10" subs, 7.2.6...
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winny
Joined: 09 Oct 2013
Posts: 403
Location: Sweden
TV/Projector: BD808s, BG1209/2
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| Posted: Thu Oct 24, 2013 11:44 am Post subject: |
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| CasetheCorvetteman wrote: | | No its more like vinyl tubing, youd have to get it very hot to shrink it. |
Right. In the electronics world I usually use teflon/PFTE tubing for these situations. Where to get the vinyl one, or a new HV lead?
| CasetheCorvetteman wrote: | | He is just having a joke mate, don't worry about him |
Ah! Not being a native English speaker means many jokes get lost.  Watching Red dwarf for instance involves hearing the audience laugh ten times more then me, at least for the early episodes.
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fragzero
Joined: 30 Aug 2012
Posts: 344
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| Posted: Thu Oct 24, 2013 12:14 pm Post subject: |
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Couldn't you leave it like this?
I have 4 quads at home and none has the additional clear protection. Maybe you had some dirt on the wire? Or the connection wasn't 100%?
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Thu Oct 24, 2013 1:15 pm Post subject: |
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| winny wrote: |
| CasetheCorvetteman wrote: | | He is just having a joke mate, don't worry about him |
Ah! Not being a native English speaker means many jokes get lost. |
With a name like Winny the very first thing I thought of when I saw it was "Winfield RED" cigarettes!! I thought "another Australian!!!"
You probably don't have them there, but they used to be somewhat of an icon here, referred to as "Winny Reds". On a par with Rothmans non-filter for strength.
You can use whatever you normally use for sleaving the cable, provided its not conductive, and if you use silicone, give it a couple days at least to cure, I wouldn't use Permatex ULTRA BLACK either
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Barco Cine 9, ,Sony VPL570ES 4K SXRD, 135" OZ Theatre Majestic 16:9 screen, Denon X6700in preamp mode, 2x 7ch Tonewinner amps, 2x Tonewinner 15" subs, 2x 10" subs, 7.2.6...
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winny
Joined: 09 Oct 2013
Posts: 403
Location: Sweden
TV/Projector: BD808s, BG1209/2
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| Posted: Thu Oct 24, 2013 7:22 pm Post subject: |
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| CasetheCorvetteman wrote: |
With a name like Winny the very first thing I thought of when I saw it was "Winfield RED" cigarettes!! I thought "another Australian!!!" |
Wish I was. Only been there once for a brief moment but it was fantastic. If I would meet a girl from Australia I would not hesitate to move there. But no, my friends gave me my nickname when I was about 10 or so.
| CasetheCorvetteman wrote: | | You can use whatever you normally use for sleaving the cable, provided its not conductive, and if you use silicone, give it a couple days at least to cure, I wouldn't use Permatex ULTRA BLACK either |
Makes perfect sense. One of the questions in an engineering newspaper here was why the reader would get a jolt from the electric fence although he was wearing rubber boots. The correct answer was posted in the next edition, they where black, and just about all black plastic and rubber is coloured using carbon black, or toner powder to you and me, which is conductive. Also, all ESD material like shoes and plastic boxes are always black. The reason is the same, carbon black. I suspect that your Permatex ULTRA BLACK is coloured with the same thing.
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Thu Oct 24, 2013 11:52 pm Post subject: |
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Possibly, but its got metalic particals in it to make it stronger!
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Barco Cine 9, ,Sony VPL570ES 4K SXRD, 135" OZ Theatre Majestic 16:9 screen, Denon X6700in preamp mode, 2x 7ch Tonewinner amps, 2x Tonewinner 15" subs, 2x 10" subs, 7.2.6...
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BGSPCS
Joined: 23 Aug 2006
Posts: 115
Location: Pottstown, PA
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| Posted: Fri Oct 25, 2013 3:17 pm Post subject: |
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I had found that on my 1200x that G2 lead wasn't fully seated onto the board connector, it did cause a small arc but not a loud explosion. Though with HV, who knows. I would check the capacitors on your boards and make sure one of them didn't explode.
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winny
Joined: 09 Oct 2013
Posts: 403
Location: Sweden
TV/Projector: BD808s, BG1209/2
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| Posted: Fri Oct 25, 2013 11:09 pm Post subject: |
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| BGSPCS wrote: | | I had found that on my 1200x that G2 lead wasn't fully seated onto the board connector, it did cause a small arc but not a loud explosion. Though with HV, who knows. I would check the capacitors on your boards and make sure one of them didn't explode. |
This was definitely the case on mine too. Still, the steel sheet was several cm away.
Which boards? Sorry, I'm new to this.
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Sat Oct 26, 2013 1:52 am Post subject: |
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I wouldnt worry too much about it unless the set doesnt work or has an obvious issue.
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