Re: Oscilloscope CRT problem
Well ,thanks for your kind offer ,but my problem was a shorted CVT not an open winding as I deduct from your experience.
Now i am checking some HV ballast for LCD Backlight with not a really good results so far; so as my last resort build a HV power supply
monpirri
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Last Activity: 07-14-2015, 03:43 PM
Joined: 02-23-2010
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Re: Oscilloscope CRT problem
Excellent job ,
I'm still working on mine...Leave a comment:
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Re: Oscilloscope CRT problem
Maybe if someone having a good 2120 can check the oscillation freq.
with a 1000VAC CCFL directly to the doubler probably works tho.Leave a comment:
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Re: Oscilloscope CRT problem
CCFLs output are normally at HF ( >20 khz ) so i guess if a high speed rectifier( or 3 serial ) and a capacitor in half wave DC can allow - 2kv ....Last edited by monpirri; 03-20-2012, 04:09 PM.Leave a comment:
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Re: Oscilloscope CRT problem
Good point , in fact i am trying to build a 2kv ps using a back light self running circuit ....Leave a comment:
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Re: Oscilloscope CRT problem
Well ,about rewinding it just made a couple attempts and always got it shorted.
Last resort was just by trying a HV transformer from a broken 15' LcD monitor but seems the voltage was not high enough to get 2kv after doubler ,just a 170 v peak.
Course i am trying to build a 2kv 10ma power supply ,the real problem is getting the freaking transformer with 500 or 600l v out.
I am uploading the Service Manual if is allowed....Leave a comment:
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Re: Oscilloscope CRT problem
Well i had the same problem with a 2120 ,now is a door stopper.
The HV output transformer (CVT T502 :063-016-9-001) got shorted and then it lost its 2kv volts.
Re-wound didn't work as secondary has a very special isolated wire very hard to find .
I sent an email to B&K and they don't give a supplier nor replacement.
Guess the best choice is to find a non working one as a source of parts ....Leave a comment:
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Re: Acer AL1715 black screen, weird scrambled signals, not ccfl problem.
Hi every 1 ,
This is my first post here ,its a hell of discovery this spot here ,I am very happy to find this tech community .
Well as a matter of luck I have my Acer 1716B with a weird noise ,good ccfl but real annoying black spots as if out of H sync signals.
Power supply is indeed well ,good caps +5 and +12 output really clean as in oscilloscope i dont see HF ripple.
Any clue is apreciatted
Monpirri...Leave a comment:
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