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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Tue May 03, 2011 5:41 pm Post subject: NEC PG xtra HVPS |
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I have a spare full HVPS from a plain NEC PG. I know that the driving board cannot be used in the xtra (what I have), but what about the flyback transformers? Is there any part in the chain which I could use as spare part to my xtra? Anyway does anybody heard of a PG HVPS failure? 
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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: Tue May 03, 2011 6:32 pm Post subject: |
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THe transformers and splitters are REALLY reliable. I hvae had bad solder joints and bad caps on the driver board, and each driver board is calibrated to each set, sorta like the NEC XG and the Sony G70, so swapping boards out may or may not work.
I did have one XG that had an intermittent arc that would take out the HV board every 100 hours or so. It belonged to Guy Kuo in Seattle, the fellow that wrote the software for the AVIA disc. I swapped him sets, replaced all the HV parts, retubed it and had no issues since. That's apparently what NEC recommended back in the day, replace it all if it's intermittent.
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Tue May 03, 2011 6:52 pm Post subject: |
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Thanks! Then I will recycle the Al housing of the transformer block 
That HPA100 transistor is impressive have you tried it as H.O.T.? It looks like it is faster than the 2SC4288, but lower amp (10A vs 12A) and dissipation (150W vs 200W)
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