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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Thu May 27, 2010 6:47 pm Post subject: |
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| chillman wrote: | Hi everyone,
As I already said in the other thread, my spare HVPS died too. (clearly a failure in the potted section)
Being a bit frustrated I then took the MOSFETs out of the spare HVPS and soldered them into the
one that failed earlier.
I didn't have much hope as these aren't even the same MOSFETs, but I just powered on the Marquee and it worked!
So nothing wrong in the potted section, I guess.
So now I'll order the right MOSFETs as I don't think the older type will work permanently in the 2004 HVPS.
I'm very happy as I wouldn't have been able to buy a new HVPS at the moment!
Greetings!
Tillman |
Sounds like the second failure was "meant to be". It was a serendipitous event, with out the second failure you may have never replaced the Mosfetts on the first Power supply.
Congratulations!!!
I love stories like this.
PS maybe a new transformer will fix the second PW supply?
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
One Smart Dog!!!
Marquee High Performance Bellows now shipping!!
Marquee Modifications and Performance Enhancement
Marquee C-element and Bellow removal
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Fri May 28, 2010 12:02 am Post subject: |
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| chillman wrote: | Hi everyone,
As I already said in the other thread, my spare HVPS died too. (clearly a failure in the potted section)
Being a bit frustrated I then took the MOSFETs out of the spare HVPS (STH15NA50FI) and soldered them into the
one that failed earlier.
I didn't have much hope as these aren't even the same MOSFETs, but I just powered on the Marquee and it worked!
So nothing wrong in the potted section, I guess.
So now I'll order the right MOSFETs as I don't think the older type will work permanently in the 2004 HVPS.
I'm very happy as I wouldn't have been able to buy a new HVPS at the moment!
Greetings!
Tillman |
There have been many Spellman HVPS repaired just by replacing the mosfets and fuse. There is a good chance the replacement parts will work for a long time. Buy the new parts but keep them for repairs if you need them down. Good fix!
Scott
_________________
"Were we directed from Washington when to sow and when to reap, we would soon want bread."
Thomas Jefferson
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chillman
Joined: 09 Apr 2007
Posts: 134
Location: Germany, Bavaria
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| Posted: Sun May 26, 2013 11:16 pm Post subject: |
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The fix lasted for EXACTLY 3 years... what a coincidence!
Now lets see if replacing the MOSFETS will do the trick again...
Greetings
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chillman
Joined: 09 Apr 2007
Posts: 134
Location: Germany, Bavaria
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| Posted: Tue May 28, 2013 11:08 am Post subject: |
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| chillman wrote: |
Now lets see if replacing the MOSFETS will do the trick again...
Greetings |
It did! Thanks again for all the help three years ago, this time the rapair took me 30 minutes 
Greetings
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friedwart
Joined: 07 Jul 2010
Posts: 54
Location: Earth, Europe, Germany @ N 51°43'10.73'' E 14°39'05.52''
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| Posted: Fri May 31, 2013 8:03 am Post subject: Is it worth trying to repair a Marquee HVPS? |
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Hello,
I've to enter that thread, because my HVPS died yesterday. Everything works fine but no picture and no error LEDs at the CLM and even no HV crackle when firing up the set (no ticking out of the HVPS). It seems (at least) like a defective diode CR7 wich unfortunately isn't named in the diagram I have. Does anybody know the type of that diode?
regards
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