TV with yellow tint for a few seconds

[Mike Smith]

Help..!!!!!!

My tv has developed a fault, which is really annoying me. Its about 5 years
old and worked fine until now. The picture is fine one minute then all of a
sudden it will get a yellow tint for about half a minute, then it will be
normal again.



Sometimes if you look carefully, there is a slightly yellow column on the
left of the screen, but its really not noticeable until the complete screen
goes that colour.



Can anyone advise what it could be?



Hope someone can help,



Steve

 

[Don Bruder]

In article <3ffdab0e$1$18029$cc9e4d1f@news.dial.pipex.com>,
"Mike Smith" <Mike_smithx1@yahoo.co.uk> wrote:

Help..!!!!!!

My tv has developed a fault, which is really annoying me. Its about 5 years
old and worked fine until now. The picture is fine one minute then all of a
sudden it will get a yellow tint for about half a minute, then it will be
normal again.



Sometimes if you look carefully, there is a slightly yellow column on the
left of the screen, but its really not noticeable until the complete screen
goes that colour.



Can anyone advise what it could be?

Red + Green = Yellow when discussing light. So "picture minus blue"
equals "yellowish picture". Which tells us that your blue electron gun
(or supporting circuitry) is crapping out for some reason. Without much
more detailed information, you're going to get nothing but guesses at
the cure. If you're lucky, one of those guesses will be the right one,
and will fix your problem. Only trouble: Figuring out which one of the
guesses is right.

For my guess:
A capacitor or transistor in the blue circuitry is in the process of
dying. I'm not even going to try to be more specific than that.

--
Don Bruder - dakidd@sonic.net <--- Preferred Email - SpamAssassinated.
Hate SPAM? See <http://www.spamassassin.org> for some seriously great info.
I will choose a path that's clear: I will choose Free Will! - N. Peart
Fly trap info pages: <http://www.sonic.net/~dakidd/Horses/FlyTrap/index.html>

 

[Myron Samila]

Hi,

Inspect the solder joints (with the set powered off) on the little PCB that contains the
socket that attaches to the tube. If the solder joints appear to be cracked (which I've
seen many many many like this), re-solder them (with the set unplugged of course), and see
what happens.

I have computer monitor that does this, sometimes it powers up fine, other times it
doesn't. Sometimes it fixes itself, however, if you hit the monitor, you can make it fail
or repair the problem.

Try smacking the side of the TV during this problem to see if it changes when you've done
this. The yellow line on the side of the screen? well, hmm, could be related, (blue drive
not working properly), etc...

--
Myron Samila
Toronto, ON Canada
Samila Racing
http://204.101.251.229/myronx19


"Don Bruder" <dakidd@sonic.net> wrote in message
news:hhiLb.7410$XF6.162649@typhoon.sonic.net...

In article <3ffdab0e$1$18029$cc9e4d1f@news.dial.pipex.com>,
"Mike Smith" <Mike_smithx1@yahoo.co.uk> wrote:

Help..!!!!!!

My tv has developed a fault, which is really annoying me. Its about 5 years
old and worked fine until now. The picture is fine one minute then all of a
sudden it will get a yellow tint for about half a minute, then it will be
normal again.



Sometimes if you look carefully, there is a slightly yellow column on the
left of the screen, but its really not noticeable until the complete screen
goes that colour.



Can anyone advise what it could be?

Red + Green = Yellow when discussing light. So "picture minus blue"
equals "yellowish picture". Which tells us that your blue electron gun
(or supporting circuitry) is crapping out for some reason. Without much
more detailed information, you're going to get nothing but guesses at
the cure. If you're lucky, one of those guesses will be the right one,
and will fix your problem. Only trouble: Figuring out which one of the
guesses is right.

For my guess:
A capacitor or transistor in the blue circuitry is in the process of
dying. I'm not even going to try to be more specific than that.

--
Don Bruder - dakidd@sonic.net <--- Preferred Email - SpamAssassinated.
Hate SPAM? See <http://www.spamassassin.org> for some seriously great info.
I will choose a path that's clear: I will choose Free Will! - N. Peart
Fly trap info pages: <http://www.sonic.net/~dakidd/Horses/FlyTrap/index.html

 

[Pieter Hoeben]

On Fri, 9 Jan 2004 12:08:03 -0500, "Myron Samila"
<myronx19@no.spam.sympatico.ca> wrote:

Try smacking the side of the TV during this problem to see if it changes when you've done
this. The yellow line on the side of the screen? well, hmm, could be related, (blue drive
not working properly), etc..
Don't smack. About the solder joint: you can see some examples of bad

joint on my homepage at http://www.hoeben.com, to to page
http://www.hoeben.com/soldering/index.html

Regards,
Pieter Hoeben

 

[Switch]

Pieter Hoeben" <hoebenNOSPAM@bigfoot.com> wrote in message
news:kqutvv45euetoo2cjvm11pkru14p3lahto@4ax.com...

On Fri, 9 Jan 2004 12:08:03 -0500, "Myron Samila"
myronx19@no.spam.sympatico.ca> wrote:
Try smacking the side of the TV during this problem to see if it changes when you've
done
this. The yellow line on the side of the screen? well, hmm, could be related, (blue
drive
not working properly), etc..

Don't smack. About the solder joint: you can see some examples of bad
joint on my homepage at http://www.hoeben.com, to to page
http://www.hoeben.com/soldering/index.html

Now why wouldn't you smack it? If you can't reproduce an intermittent fault that is
obviously due to a cold solder joint?!?!

This is called quick and reliable troubleshooting. In my line of work, if a technician
did the 'logical' thing, he'd be repairing a unit for hours, and getting fired for his
practice. In the field, when problems arise, you do what you can to get a problem to be
duplicated, ie: smacking.

Offering a suggestion not to smack isn't good enough, sometimes viewing solder joints
isn't good enough, sometimes traces crack right at the end of the joint/pad/trace, or, the
component separates from its terminal (ie: electrolytic cap).

Without knowing your electronics background, I bet that you'd take too long to repair the
simplest of jobs.

I've got years of experience as a TV technician, and you? I'm not trying to be an idiot,
this is just a follow up to your vague attempt at replying to another posters answer that
seems quite logical actually.

In Televisions, most common problems for such as the OP mentioned is due to thermal
stresses on the components, especially how fragile the cheap sockets on some televisions
are.

I visited your site, you have to also think, sometimes it is not the component that isn't
mounted well (which does cause cracks to develop), however, wave soldering or blown on
doesn't produce the best results all the time. Sometimes, due to oxidization, only a
trace amount of solder on the skin 'outer joint', is making a connection. Over time, due
to thermal stresses or mechanical stresses, the solder joints form cracks, either
completely disconnecting the component in question, or increasing resisitance.

Most common fault of electronics today are cold solder joints, agreed? Your site shows a
couple of examples.


Greg

 

[Andre]

"Switch" <clubkidd_toronto@hotmail.com> wrote in message news:<VLWLb.2981$fM3.21907@news20.bellglobal.com>...

Pieter Hoeben" <hoebenNOSPAM@bigfoot.com> wrote in message
snippage

Most common fault of electronics today are cold solder joints, agreed? Your site shows a
couple of examples.

<koff> lead Free Solder </koff> AAAUGHHH!
methinks the landfills will be full in no time when new equipment made
with this stuff starts failing in droves!

BTW, what soldering flux have you found is the best for SMD soldering
rework?
-A

Greg

 

[Mike Smith]

Thanks to all who replied both on the newsgroup and through email. Didn't
want to spend any longer on this tv so it ended up in the bin. The repair
bill just to look at it and tell me what's wrong were too high, never mind
actually repairing it. Thanks for your suggestions.



Steve




"Andre" <testing_h@yahoo.com> wrote in message
news:2c2cf14c.0401120949.342a8938@posting.google.com...

"Switch" <clubkidd_toronto@hotmail.com> wrote in message
news:<VLWLb.2981$fM3.21907@news20.bellglobal.com>...
Pieter Hoeben" <hoebenNOSPAM@bigfoot.com> wrote in message
snippage

Most common fault of electronics today are cold solder joints, agreed?
Your site shows a
couple of examples.

koff> lead Free Solder </koff> AAAUGHHH!
methinks the landfills will be full in no time when new equipment made
with this stuff starts failing in droves!

BTW, what soldering flux have you found is the best for SMD soldering
rework?
-A




Greg

 

[Harry Conover]

"Mike Smith" <Mike_smithx1@yahoo.co.uk> wrote in message news:<400317df$0$7012$cc9e4d1f@news.dial.pipex.com>...

Thanks to all who replied both on the newsgroup and through email. Didn't
want to spend any longer on this tv so it ended up in the bin. The repair
bill just to look at it and tell me what's wrong were too high, never mind
actually repairing it. Thanks for your suggestions.

That decision make sens, because today TVs are throw aways that except
in exceptional instnaces aren't worth the time/expense of repairing.

This should focus attention for a good warranty on the product when it
is being purchases. If the product outlasts its warrantly, there is a
very good chance that it will outlive its utility.

Harry C.