19v2000 diode replaced; arcing

akeym

Member

Donor 2012
Joined
Feb 14, 2012
Messages
56
Reaction score
0
Location
Oregon
I'm getting a decent bit of arcing from what appears to be one end of the HV diode after replacing the old one. Actually, there wasn't an "original" when I got it, just an NTE518 soldered in-line and sorta covered with heat shrink tubing (monitor was DOA, blown F102). I replaced this with an SK3108 (NTE505) and globbed on the silcone. After a day of drying, I re-assembled and fired it up. Monitor "works" but as I said before, it's arcing inside the HV cage.

Should I just add more silcone or is this a sign of another issue?
 
So you did this...?

newdiodertv.jpg
 
Yes, that is how I replaced it. The boots for the ends of the diode were missing when I received the monitor. I've put on a bit more silicone than that picture.
 
Can you tell, either from observation or from marks left, where's it's arcing from and to?
 
has anyone ever tried using straight or 90 degree elbows from automotive spark plug wires? They handle alot of kvolts and are made to take alot of heat too.
like this: http://www.oreillyauto.com/site/c/d....oap?ck=Search_N0607_-1_-1&pt=N0607&ppt=C0150

or this?: http://www.oreillyauto.com/site/c/d....oap?ck=Search_N0607_-1_-1&pt=N0607&ppt=C0150

Heres a straight one: http://www.oreillyauto.com/site/c/d....oap?ck=Search_N0607_-1_-1&pt=N0607&ppt=C0150



Might be worth a try someday if i ever get one of these.
 
Last edited:
Well, more silicone seemed to fix it. However, now that I feel safe doing voltage checks... my 95v line off the HV regulator is only ~60v. Adjusting the hv trim pot has no effect. I never got to do a real check on this monitor before hand. The previous person mounted one of the external transistors without an insulator so it was always shorted to ground - didn't notice this until after replacing the diode. I get a picture on the screen, so I can't be that far from fixing this guy.

DarrenF: Couldn't tell - seemed like it was the anode side. No visible aftermarks from the arcing anywhere.
 
Back
Top Bottom