CRT Problem - red gone

AlexD · 14-04-2011, 22:42

Hi, I dont know a lot about the technical side of CRT. Basically the red has gone on the set.

Once this happens is the tube and set a write off or is it something that can be fixed?

Winston_1 · 14-04-2011, 22:44

Probably not the tube. This is usually caused by the red video output transistor.

AidanLunn · 14-04-2011, 23:17

It's very unlikely to be a tube fault (though I think I've heard that this is more likely if it's a Philips tube). It's a fault on the tube drive board - though the list of clapped out components that can cause this is slightly larger than just the red output transistor. I've repaired an ageing Sony Trinitron that had very, very weak red by changing a few diodes and resistors.

Chris Frost · 15-04-2011, 00:22

The thing is that this is a CRT TV, so the practical considerations of finding a local repairer, moving the set, the time and cost of the repair plus the chance that something else might go wrong....versus a replacement second-hand CRT for £50~free depending on luck

alan_m · 15-04-2011, 00:43

Quote:

Originally Posted by AlexD

Hi, I dont know a lot about the technical side of CRT. Basically the red has gone on the set.

Once this happens is the tube and set a write off or is it something that can be fixed?

Or if your viewing is via a set top box possibly the SCART cable isn't fully seated. If one side of the SCART cable pulls out ever so slightly it'll be the red channel that gets disconnected first.

AlexD · 15-04-2011, 02:17

Thanks for the replies.
It is a Philips set, so possibly the tube then?
I spoke to a local repairer who said it was probably the red gun and not fixable.

It is (was) a really good set so I am loathe to bin it and get another one, unless absolutely necessary. I cant remember the model number but it is a 28" widescreen 100Hz set with built in surround sound. The picture quality pre-red fault was really good. I am on a tight budget so a repair would be preferable to getting a new set.

Is it possible to replace the whole control board cheaply rather than individual components?

I actually won it from u direct movies (anyone remember them?)

Chris Frost · 15-04-2011, 05:45

Maybe from a working donor set... but then why not just swap the whole TV.

I started off with a top-of-the-range 32" Philips Pixel Plus set from 2003.The 32PW9527. It was £1200 at the time. It croaked in 2008. I had a repairer look at it and the verdict came back as beyond economical repair. I bought a secondhand replacement - similar model - the 9517 - for £45. That lasted a couple of years until I found a 9527 going cheap on Ebay - £25. ......It's just a thought

pocatello · 15-04-2011, 08:29

Yea the cost of repair just isnt worth it. The things value is close to zero now, just look on the online classifieds or ebay or freecycle for an old crt, someone might even give it to you just to get it off their hands...the trouble of disposal is what most folks are worried about when it comes to crt

Nigel Goodwin · 15-04-2011, 08:56

If it's a Philips, it's almost certainly the CRT - but as a CRT set it's worthless now anyway, we bin dozens of perfectly working CRT sets a week.

AlexD · 15-04-2011, 14:41

Thanks guys.

Thats 3 votes for the tube gone so I will recycle it.

Richer sounds are offering £150 trade in value so I will look into that!

Thanks again.

14-04-2011, 22:42	#1
AlexD Forum Member Join Date: Jul 2002 Location: Berkshire Posts: 1,202	CRT Problem - red gone Hi, I dont know a lot about the technical side of CRT. Basically the red has gone on the set. Once this happens is the tube and set a write off or is it something that can be fixed?

14-04-2011, 22:44	#2
Winston_1 Forum Member Join Date: Oct 2007 Posts: 5,008	Probably not the tube. This is usually caused by the red video output transistor.

14-04-2011, 23:17	#3
AidanLunn Forum Member Join Date: Apr 2010 Posts: 5,045	It's very unlikely to be a tube fault (though I think I've heard that this is more likely if it's a Philips tube). It's a fault on the tube drive board - though the list of clapped out components that can cause this is slightly larger than just the red output transistor. I've repaired an ageing Sony Trinitron that had very, very weak red by changing a few diodes and resistors.

15-04-2011, 00:22	#4
Chris Frost Forum Member Join Date: Jun 2003 Location: Cheshire Posts: 6,462	The thing is that this is a CRT TV, so the practical considerations of finding a local repairer, moving the set, the time and cost of the repair plus the chance that something else might go wrong....versus a replacement second-hand CRT for £50~free depending on luck

15-04-2011, 00:43	#5
alan_m Forum Member Join Date: May 2008 Posts: 1,586	Quote: Originally Posted by AlexD Hi, I dont know a lot about the technical side of CRT. Basically the red has gone on the set. Once this happens is the tube and set a write off or is it something that can be fixed? Or if your viewing is via a set top box possibly the SCART cable isn't fully seated. If one side of the SCART cable pulls out ever so slightly it'll be the red channel that gets disconnected first.

15-04-2011, 02:17	#6
AlexD Forum Member Join Date: Jul 2002 Location: Berkshire Posts: 1,202	Thanks for the replies. It is a Philips set, so possibly the tube then? I spoke to a local repairer who said it was probably the red gun and not fixable. It is (was) a really good set so I am loathe to bin it and get another one, unless absolutely necessary. I cant remember the model number but it is a 28" widescreen 100Hz set with built in surround sound. The picture quality pre-red fault was really good. I am on a tight budget so a repair would be preferable to getting a new set. Is it possible to replace the whole control board cheaply rather than individual components? I actually won it from u direct movies (anyone remember them?)

15-04-2011, 05:45	#7
Chris Frost Forum Member Join Date: Jun 2003 Location: Cheshire Posts: 6,462	Maybe from a working donor set... but then why not just swap the whole TV. I started off with a top-of-the-range 32" Philips Pixel Plus set from 2003.The 32PW9527. It was £1200 at the time. It croaked in 2008. I had a repairer look at it and the verdict came back as beyond economical repair. I bought a secondhand replacement - similar model - the 9517 - for £45. That lasted a couple of years until I found a 9527 going cheap on Ebay - £25. ......It's just a thought

15-04-2011, 08:29	#8
pocatello Inactive Member Join Date: Mar 2010 Posts: 8,622	Yea the cost of repair just isnt worth it. The things value is close to zero now, just look on the online classifieds or ebay or freecycle for an old crt, someone might even give it to you just to get it off their hands...the trouble of disposal is what most folks are worried about when it comes to crt

15-04-2011, 08:56	#9
Nigel Goodwin Forum Member Join Date: Apr 2006 Location: North Derbyshire Posts: 41,789	If it's a Philips, it's almost certainly the CRT - but as a CRT set it's worthless now anyway, we bin dozens of perfectly working CRT sets a week.

15-04-2011, 14:41	#10
AlexD Forum Member Join Date: Jul 2002 Location: Berkshire Posts: 1,202	Thanks guys. Thats 3 votes for the tube gone so I will recycle it. Richer sounds are offering £150 trade in value so I will look into that! Thanks again.

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CRT Problem - red gone