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nidi
Joined: 17 Aug 2008
Posts: 305
Location: Switzerland
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| Posted: Sun Jan 08, 2012 11:20 pm Post subject: another HVPS nuked! 3rd in a row! |
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Hello guys,
just found out that my Marquee n uked another HVPS.
made a mistake in pushing the Power Button twice, switchd the projector off then on and off again
did not power up next day.
found out today that the HVPS in nuked again.
3rd in one year.
will try to put an a 34kV HVPS , due to better protection.
anyone know how to modify a 'normal' HVPS to ave better protection ?
Thanks
Michael
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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: Sun Jan 08, 2012 11:46 pm Post subject: |
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I had one customer that went through 4 in about 6 months a long time ago, on an 8000 I think. Of course he didn't tell me that he'd bought his 3rd one from me, to replace 2 he'd already bought, then wanted warranty. After the second one I'd asked him if he'd had this problem before, and he told me that yes, he'd gone through 2 already. Unfortunately he wasn't local, and while he did send me back one of his originals, he had hacked the silicone open, so I had no idea where the problem was.
I would change the HV splitter and the LVPS and maybe the HV leads. It seems unlikely if the set is working that something can 'overload' the HV output, you'd see that in the image, but 3 HVPS in a year is unacceptable!
We discussed this here or at avs when I found out about my customer, and the only thing we could come up with is that maybe the 380 volt input to the HVPS was high, stressing the parts.
Turning the set on and off quickly did NOT kill your HVPS.
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Mon Jan 09, 2012 4:47 am Post subject: |
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| Curt Palme wrote: |
Turning the set on and off quickly did NOT kill your HVPS. |
Was gonna say... Id be very dissapointed it that was all it took to kill one...
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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 Jan 09, 2012 6:06 am Post subject: |
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Now, a woman is an entirely different story. Turn her off after you turned her on, and it's all over. 
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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: Mon Jan 09, 2012 6:13 am Post subject: |
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| Curt Palme wrote: | | Now, a woman is an entirely different story. Turn her off after you turned her on, and it's all over. |
3 minutes of fame; 15 minutes of shame 
_________________
Tech support for nothing
CRT.
HD done right!
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Mon Jan 09, 2012 8:38 am Post subject: |
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| Curt Palme wrote: | | Now, a woman is an entirely different story. Turn her off after you turned her on, and it's all over. |
Cant say ive ever had that issue mate... 
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nidi
Joined: 17 Aug 2008
Posts: 305
Location: Switzerland
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| Posted: Mon Jan 09, 2012 9:10 am Post subject: |
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| Curt Palme wrote: | I had one customer that went through 4 in about 6 months a long time ago, on an 8000 I think. Of course he didn't tell me that he'd bought his 3rd one from me, to replace 2 he'd already bought, then wanted warranty. After the second one I'd asked him if he'd had this problem before, and he told me that yes, he'd gone through 2 already. Unfortunately he wasn't local, and while he did send me back one of his originals, he had hacked the silicone open, so I had no idea where the problem was.
I would change the HV splitter and the LVPS and maybe the HV leads. It seems unlikely if the set is working that something can 'overload' the HV output, you'd see that in the image, but 3 HVPS in a year is unacceptable!
We discussed this here or at avs when I found out about my customer, and the only thing we could come up with is that maybe the 380 volt input to the HVPS was high, stressing the parts.
Turning the set on and off quickly did NOT kill your HVPS. |
Thanks Curt,
HV Splitter has been changed before.
HVPS will be the old one that has better protection.
Steve told me that the leads are ok.
Michael
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