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capacitor replacement value 12pf to 18pf

allanitto

Dec 21, 2010
2
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Dec 21, 2010
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Hi guys,

I need to fix an inverter board from sonicview 22" monitor and I have this problem finding exact cap value. I have blown 2 12pf 3kv and I was wondering if I could replace it with 18pf 3kv or 10pf 6kv. Any Idea which one is acceptable? I don't even know if it's possible. These are the only cap value I could find locally.

see attachment... I took it from the other guy that has the same exact problem with mine...

Thanks in advance.
 

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Resqueline

Jul 31, 2009
2,848
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If I'm not very much mistaken the capacitor value may participate in determining the lamp current. I'm not sure how much deviation is acceptable, & which way is best.
If you were able to get 2.2pF (to put in parallell with the 10pF) or 22 & 27pF (to put in series with each other, giving 12pF), it would be ideal.
 

allanitto

Dec 21, 2010
2
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Dec 21, 2010
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Thanks for the fast reply. yes that's true I never thought of that, can do it parallel or series. but my problem is I don't know how the board was designed. it is E131175 but I can't find schematics for it. Need help.


Thanks
 

jerryg50

Apr 18, 2010
57
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Apr 18, 2010
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57
Capacitor Replacement Value

If the cap is not in a critical oscillator or frequency filter circuit the value will not be critical. If the cap is a noise bypass cap, or a high frequency coupling cap, or something like that, you can go 20% off value and it should not make any difference.



Jerry G.





Hi guys,

I need to fix an inverter board from sonicview 22" monitor and I have this problem finding exact cap value. I have blown 2 12pf 3kv and I was wondering if I could replace it with 18pf 3kv or 10pf 6kv. Any Idea which one is acceptable? I don't even know if it's possible. These are the only cap value I could find locally.

see attachment... I took it from the other guy that has the same exact problem with mine...

Thanks in advance.
 

Resqueline

Jul 31, 2009
2,848
Joined
Jul 31, 2009
Messages
2,848
There's hardly need for any schematics here. Those capacitors are used as series impedance elements for the fluorescent tubes, and as such their value matters.
 

blackmousepad

Dec 27, 2010
1
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Dec 27, 2010
Messages
1
Mouser Electronics... 81-DEF1XLH120JA3B Just ordered these for the set I'm working on. My issue is that C528 , the N3 3Kv sec in the photo posted by allanitto is also shot.
The best I can figure is that the n3 is a 300pf, closest one I could find is a 330pf 10% tolerance.

Just ordered both, going to give it a shot when the parts arrive.
 

gurmej

Jan 1, 2011
4
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Jan 1, 2011
Messages
4
Hi
from the picture it looks like a tantalum cap which are polorised
if they are blowing then it could be you inserted them incorrectly check polarity
the actual capacitance value is not is not critical but voltage rating is.
 

davenn

Moderator
Sep 5, 2009
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14,254
Hi
from the picture it looks like a tantalum cap which are polorised
if they are blowing then it could be you inserted them incorrectly check polarity
the actual capacitance value is not is not critical but voltage rating is.

no they are not low voltage tant's, they are as discussed hi voltage ceramics
they are in EVERY hi voltage fluro driver cct

Dave

Allenitto.... pitty we didnt live closer, I have so many of those caps available, as I do a lot of repair work on LCD panels. Relatively rare for those caps to fail like in the pic. Its more common for the low voltage switching side to fail
 
Last edited:

theonesdg

Feb 14, 2012
1
Joined
Feb 14, 2012
Messages
1
Allenitto, did you ever find a suitable replacement? I'm working on the exact same board and had the exact same question.
 
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