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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: Fri Jul 24, 2009 6:31 pm Post subject: Hey Macguyver! NEC plasma TV problem! |
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Just got in an older NEC PX42VP4 plasma.
It will power up fine without an input signal, but once an input signal is fed to the set, the picture will come up normally for a split second, then will go dark and almost negative, and either within seconds or a minute will shut down.
I'm guessing a bad cap somewhere in the power supply? Should I scope the outputs to see what voltage drops?
Thanks!
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jul 24, 2009 8:31 pm Post subject: Re: Hey Macguyver! NEC plasma TV problem! |
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| Curt Palme wrote: | Just got in an older NEC PX42VP4 plasma.
It will power up fine without an input signal, but once an input signal is fed to the set, the picture will come up normally for a split second, then will go dark and almost negative, and either within seconds or a minute will shut down.
I'm guessing a bad cap somewhere in the power supply? Should I scope the outputs to see what voltage drops?
Thanks! |
WOW. You must be in your glory. Finally a flat panel to work on. 
Well I see you posted this 2 hours ago so I'm sure you've been in there messing around. Have you come up with anything yet?
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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: Sat Jul 25, 2009 12:38 am Post subject: |
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Nope I was out on calls. Working on it tonight if I get a sec.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Jul 26, 2009 2:36 am Post subject: |
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Just so you guys know this is a work in progress. There is to much back and forth to post here so its in PM. But I think Curt's about ready to throw it out the window.  So if anybody wants to catch it 
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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: Sun Jul 26, 2009 4:01 am Post subject: |
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Yeah, I found the problem, then the set went dead. ^&*^% digitals!
BUt.. once I'm up to speed, I think I'll start trolling for defective sets on CL. Despite being a nonrealistic picture, I could see about 4 places in the house where I want to put one, and I know selling refurb LCDs/Plasmas on Craigslist locally to the redneck trailer park folks will be like shooting fish in a barrel.
Gotta say, this NEC was exceptionally well built, but being the first set I've worked on, the learning curve is steeeeeeeeeeeeeeeeep!
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