Widescreen Blue Blooming TV ! 1yr later goes flashes Green and shuts down ...nice

TV has started flashing green and shutting down. Did this once a month or so now every few hours. Sometimes, TV steadies after green flash and recovers only to shut down later. Suggestions for a fix include:

Intermittent H-K carbon particle short - 1kV - 2amp diode on CRT board may fix gun short
Common particle green cathode to heater short ?

Any ideas or advice appreciated

Thanks

PS Details of previous problem with same set a year inlcudes that ended in a CRT replacement.

JVC AV-32WP2EK 32" All 6 messages in topic - view as tree From: JM - view profile Date: Thurs, Feb 17 2005 2:44 pm Email: "JM" Groups: sci.electronics.repair Not yet ratedRating: show options

I have the above model 32" widescreen TV that intially starts up OK for first 30secs but then blooms into blue with thin horozontal sloped lines in blue. Blueness gradually fades over the next 10-20minutes to a perfect picture which lasts without further problem. Checking the web a positor preventing degaussing appears a possibility. Though switching on/off doesn't help much and no speakers are near by and TV has been unplugged and started repeatly.

Any other suggestions / theories ? Can using service mode help further ?

Thanks

From: b - view profile Date: Fri, Feb 18 2005 1:10 am Email: reverend snipped-for-privacy@yahoo.com (b) Groups: sci.electronics.repair Not yet ratedRating: show options

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I have the above model 32" widescreen TV that intially starts up OK for > first 30secs but then blooms into blue with thin horozontal sloped lines in > blue. > Blueness gradually fades over the next 10-20minutes to a perfect picture > which lasts without further problem. Checking the web a positor preventing > degaussing appears a possibility. Though switching on/off doesn't help much > and no speakers are near by and TV has been unplugged and started repeatly.

Any other suggestions / theories ? Can using service mode help further ?
> Thanks

Are you talking about retrace lines? this is almost certainly not a degauss problem. dont touch the service mode, this sounds like component failure. check: components on crt neck board, video drivers, possibly crt socket?

- B

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From: Phil Bowser - view profile Date: Fri, Feb 18 2005 5:35 am Email: "Phil Bowser" Groups: sci.electronics.repair Not yet ratedRating: show options

I agree with "b" - it certainly does not sound degaussing related, based on your description of the problem.

The only thing that "puzzles" me about the situation is your description of "gradually" returning to normal. In the event of either solder connections, or a H-K short I would expect the screen to abruptly change from normal to blue (or green) (or red), but not gradually... If it were in front of me, I would be using the old beat-on-it routine to try and decide if you're dealing with solder connections or a tube. If minor bumps to the cabinet or movement of the set corrects it, it is probably solder connections. If it requires a really hard slap to the face of the tube with the palm of your hand, I would say you've got an intermittent H-K short in the CRT (Picture tube). If it doesn't respond at all to this tormenting, you're probably looking at some solid state failure / electrically leaky component like a video drive transistor, or AKB feedback component (You'll need a schematic & parts list.)

Due to the fact that the symptom CHANGES, - leave the service menus ALONE! - You'll only create for yourself another problem you'll have to go back and correct once you fix the real problem.

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Hi > I have the above model 32" widescreen TV that intially starts up OK for > first 30secs but then blooms into blue with thin horozontal sloped lines in > blue. > Blueness gradually fades over the next 10-20minutes to a perfect picture > which lasts without further problem. Checking the web a positor preventing > degaussing appears a possibility. Though switching on/off doesn't help much > and no speakers are near by and TV has been unplugged and started repeatly.

Any other suggestions / theories ? Can using service mode help further ?
> Thanks

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From: JM - view profile Date: Fri, Feb 18 2005 11:32 am Email: "JM" Groups: sci.electronics.repair Not yet ratedRating: show options

Phil

I like your style...slap the TV about a bit, make it talk Jack Bauer style. Few more details:

Picture always starts good 30sec-1mins ish. Blueness appears and intensifies until picture is bleached out completely but then gradually the picture reappears and the blueness fades. Sometimes the blueness fades quickly I agree with "b" - it certainly does not sound degaussing related, > based > on your description of the problem.

The only thing that "puzzles" me about the situation is your > description > of "gradually" returning to normal. In the event of either solder > connections, or a H-K short I would expect the screen to abruptly change > from normal to blue (or green) (or red), but not gradually... If it were > in > front of me, I would be using the old beat-on-it routine to try and decide > if you're dealing with solder connections or a tube. If minor bumps to > the > cabinet or movement of the set corrects it, it is probably solder > connections. If it requires a really hard slap to the face of the tube > with > the palm of your hand, I would say you've got an intermittent H-K short in > the CRT (Picture tube). If it doesn't respond at all to this tormenting, > you're probably looking at some solid state failure / electrically leaky > component like a video drive transistor, or AKB feedback component (You'll > need a schematic & parts list.)

Due to the fact that the symptom CHANGES, - leave the service menus > ALONE! - You'll only create for yourself another problem you'll have to go > back and correct once you fix the real problem.
>> I have the above model 32" widescreen TV that intially starts up OK for >> first 30secs but then blooms into blue with thin horozontal sloped lines > in >> blue. >> Blueness gradually fades over the next 10-20minutes to a perfect picture >> which lasts without further problem. Checking the web a positor > preventing >> degaussing appears a possibility. Though switching on/off doesn't help > much >> and no speakers are near by and TV has been unplugged and started > repeatly.

> Any other suggestions / theories ? Can using service mode help further ?
>> Thanks

> JM

From: JVC Dude - view profile Date: Fri, Feb 18 2005 8:10 pm Email: "JVC Dude" Groups: sci.electronics.repair Not yet ratedRating: show options

Certainly sounds like the tube to me... The Philips 32" tubes used in these sets have been much more reliable than the 28" wide and 29" 4:3 ones from the late 90s, but the change of colour cast is a similar tell tale sign...

gentle!! tapping on the tube neck might cause flashes or casts to change, confirming the diagnosis. Sometimes you can clean them up with a tube rejuvenator but these tubes have a very low heater tolerance to the increased voltage used in the boost/clean process- The heater for one colour can easily fail !!

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Phil > Phil

I like your style...slap the TV about a bit, make it talk Jack Bauer style. > Few more details:
> Picture always starts good 30sec-1mins ish. Blueness appears and > intensifies until picture is bleached out completely but then gradually the > picture reappears and the blueness fades. Sometimes the blueness fades > quickly (usually yellowy) I mean deeper tonal/contrast for a split second then > flicks back less than a second to normal. TV has then run for 5mins but > then apparently shorts out and shuts down - but its only done this

2/3 > times. Usually, the picture stabilises and set will run fine for hrs on > end. However, restarting the TV when warm doesn't prevent problem, just > starts over again, stabilises and then OK.

A TV tech friend is coming round Sat, he thought "CRT short" but expected > set to short out everytime after a few minutes. > I'll give it a good seeing to tonight :-).and see what happens.
> Thanks

JM
> > The only thing that "puzzles" me about the situation is your > > description > > of "gradually" returning to normal. In the event of either solder > > connections, or a H-K short I would expect the screen to abruptly change > > from normal to blue (or green) (or red), but not gradually... If it were > > in > > front of me, I would be using the old beat-on-it routine to try and decide > > if you're dealing with solder connections or a tube. If minor bumps to > > the > > cabinet or movement of the set corrects it, it is probably solder > > connections. If it requires a really hard slap to the face of the tube > > with > > the palm of your hand, I would say you've got an intermittent H-K short in > > the CRT (Picture tube). If it doesn't respond at all to this tormenting, > > you're probably looking at some solid state failure / electrically leaky > > component like a video drive transistor, or AKB feedback component (You'll > > need a schematic & parts list.)

> Due to the fact that the symptom CHANGES, - leave the service menus > > ALONE! - You'll only create for yourself another problem you'll have to go > > back and correct once you fix the real problem.
> >> I have the above model 32" widescreen TV that intially starts up OK for > >> first 30secs but then blooms into blue with thin horozontal sloped lines > > in > >> blue. > >> Blueness gradually fades over the next 10-20minutes to a perfect picture > >> which lasts without further problem. Checking the web a positor > > preventing > >> degaussing appears a possibility. Though switching on/off doesn't help > > much > >> and no speakers are near by and TV has been unplugged and started > > repeatly.

>> Any other suggestions / theories ? Can using service mode help further ?
> >> Thanks

>> JM

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From: John Mercer - view profile Date: Sun, Feb 20 2005 4:42 pm Email: "John Mercer" Groups: sci.electronics.repair Not yet ratedRating: show options

Confirmed as tube......replacement with a 2yr one is going to be £100inc P&L so probably try that!

Thanks

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