Sylvania 27" tv Brightness Flickers

  • Thread starter Michael Kennedy
  • Start date
M

Michael Kennedy

Guest
I have a 1987 27" Sylvania tv and it had some cold solder joints which I
fixed. It works great except the picture gets slightly brighter and dimmer.
Could this be caused by the wire going from the flyback to the cathode? When
I first put it back togeather I could hear it arcing a little like the
suction cup wasn't all of the way down. It doesn't make a arcing noise
anymore.

The model number of the tv is RNH4601 WA01
The Chasis model # is 26B1-06AA
Manufacture date October 1987


- Mike
 
Michael Kennedy wrote:

Could this be caused by the wire going from the flyback to the cathode?
Click to expand...
The "Flyback to cathode wire"!? Jeez.....

No it is caused by the brightness to darkness tube failing.
 
Sorry. I couldn't remember what it is called. EXCUSE ME for not beign an
expert I don't do this for a job.

I was talking about the HV wire going to the CRT. (cathode ray tube) I
describet quite well what I was talking about. The wire does run from the
flyback to the Cathode (CRT)...
"Just Another Theremin Fan" <
wrote in message
news:1128696063.624361.170000@g49g2000cwa.googlegroups.com...

Michael Kennedy wrote:

Could this be caused by the wire going from the flyback to the cathode?

The "Flyback to cathode wire"!? Jeez.....

No it is caused by the brightness to darkness tube failing.
Click to expand...
 
Michael Kennedy wrote:
Sorry. I couldn't remember what it is called. EXCUSE ME for not beign an
expert I don't do this for a job.

I was talking about the HV wire going to the CRT. (cathode ray tube) I
describet quite well what I was talking about. The wire does run from the
flyback to the Cathode (CRT)...
Click to expand...
Hi...

Just so this doesn't happen again, AND so I can lecture you just a
tiny bit...

Yep, CRT is cathode ray tube. The cathode is one of the elements in
a cathode ray tube. (cathode ray = a ray [stream?] of electrons flying
off a heated cathode)

All of the connections to a cathode ray tube save one are connected via
the neck of the tube.

The one exception is the one you speak of, most generally recognized
as the second anode.

Hope that helps, now here's the lecture :)

Seeing you admitted to "not doing this for a job" - that connection
is lethal. It's lethal whether turned on or turned off, whether plugged
into the wall socket or not. It's even lethal after being discharged
and sitting for a short while (or a long while)

Be careful of it!!!!

Take care.

Ken
 
"Michael Kennedy" bravely wrote to "All" (06 Oct 05 23:52:12)
--- on the heady topic of "Sylvania 27" tv Brightness Flickers"

MK> From: "Michael Kennedy" <Mikek400@remthis.comcast.net>
MK> Xref: core-easynews sci.electronics.repair:344333

MK> I have a 1987 27" Sylvania tv and it had some cold solder joints which
MK> I fixed. It works great except the picture gets slightly brighter and
MK> dimmer. Could this be caused by the wire going from the flyback to the
MK> cathode? When I first put it back togeather I could hear it arcing a
MK> little like the suction cup wasn't all of the way down. It doesn't
MK> make a arcing noise anymore.

MK> The model number of the tv is RNH4601 WA01
MK> The Chasis model # is 26B1-06AA
MK> Manufacture date October 1987


Mike,

It could be the flyback assembly alright. The flickering might be the
the g2 voltage jumping around. If you smell something like burnt toast
around that area then the flyback *is* toast. Otherwise it may be a
video problem.

A*s*i*m*o*v

.... :<) What does that wire do? =8<Q (oh!)
 
I know about how the tube can possibley charge its self back up even after
you discharge it. I usually keep a ground wire clipped on it when working on
a tv. Thanks I just couldn't remember the word anode.

- Mike
"Ken Weitzel" <kweitzel@shaw.ca> wrote in message
news:wOw1f.103736$1i.42961@pd7tw2no...
Michael Kennedy wrote:
Sorry. I couldn't remember what it is called. EXCUSE ME for not beign an
expert I don't do this for a job.

I was talking about the HV wire going to the CRT. (cathode ray tube) I
describet quite well what I was talking about. The wire does run from the
flyback to the Cathode (CRT)...

Hi...

Just so this doesn't happen again, AND so I can lecture you just a
tiny bit...

Yep, CRT is cathode ray tube. The cathode is one of the elements in
a cathode ray tube. (cathode ray = a ray [stream?] of electrons flying
off a heated cathode)

All of the connections to a cathode ray tube save one are connected via
the neck of the tube.

The one exception is the one you speak of, most generally recognized
as the second anode.

Hope that helps, now here's the lecture :)

Seeing you admitted to "not doing this for a job" - that connection
is lethal. It's lethal whether turned on or turned off, whether plugged
into the wall socket or not. It's even lethal after being discharged
and sitting for a short while (or a long while)

Be careful of it!!!!

Take care.

Ken
Click to expand...
 
Seeing you admitted to "not doing this for a job" - that connection
is lethal.
Click to expand...
That's what I was implying. The guy really shouldn't be messing with
it.

I dread to think what these people do "for a job" and if they have the
same attitude to their work as they do with dealing with electrical
equipment.
 
I'm a college student and I am a computer tech and I do my job quite well.
I'm sure there was a time when you didn't know everything there is to know.
I'm the first to admit I don't know everything. No one does! I actually just
forgot the name since I rarely work on Televisions. I'm still learning but I
do know to discharge all of the large caps and the anode before you start
working on a tv and to keep a ground wire attached to the anode while
working on a tv.

I am very careful with electricity. I have been working with electricity all
of my life and I used to work as an elctrician. I try to never work on
anything hot if possible.

I hate how you just insult me like I am an idiot.

I dread to think what these people do "for a job" and if they have the
same attitude to their work as they do with dealing with electrical
equipment.
Click to expand...
 
Thanks I'll check it or sniff it out.
- Mike

"Asimov" <Asimov@-removethis-bbs.juxtaposition.dynip.com> wrote in message
news:MSGID_1=3a167=2f133.0_4346893f@fidonet.org...
"Michael Kennedy" bravely wrote to "All" (06 Oct 05 23:52:12)
--- on the heady topic of "Sylvania 27" tv Brightness Flickers"

MK> From: "Michael Kennedy" <Mikek400@remthis.comcast.net
MK> Xref: core-easynews sci.electronics.repair:344333

MK> I have a 1987 27" Sylvania tv and it had some cold solder joints which
MK> I fixed. It works great except the picture gets slightly brighter and
MK> dimmer. Could this be caused by the wire going from the flyback to
the
MK> cathode? When I first put it back togeather I could hear it arcing a
MK> little like the suction cup wasn't all of the way down. It doesn't
MK> make a arcing noise anymore.

MK> The model number of the tv is RNH4601 WA01
MK> The Chasis model # is 26B1-06AA
MK> Manufacture date October 1987


Mike,

It could be the flyback assembly alright. The flickering might be the
the g2 voltage jumping around. If you smell something like burnt toast
around that area then the flyback *is* toast. Otherwise it may be a
video problem.

A*s*i*m*o*v

... :<) What does that wire do? =8<Q (oh!)
Click to expand...
 
Michael Kennedy wrote:
I'm a college student and I am a computer tech and I do my job quite well.
Click to expand...
But you don't know a cathode from an anode? Gee that's some college you
go to!
There's multiple choice education for you.... How do you manage to get
positive and negative the right way around?

I am very careful with electricity. I have been working with electricity all
of my life and I used to work as an elctrician.
Click to expand...
Have you heard Kevin Bloody Wilsons song about electricians?

I hate how you just insult me like I am an idiot.
Click to expand...
But you are.... You are......

FFS don't ever take up working with gas supplies.....
 
On 7 Oct 2005 12:31:33 -0700, "Just Another Theremin Fan"
<dcjtee@aol.com> wrote:

Michael Kennedy wrote:
I'm a college student and I am a computer tech and I do my job quite well.

But you don't know a cathode from an anode? Gee that's some college you
go to!
There's multiple choice education for you.... How do you manage to get
positive and negative the right way around?


I am very careful with electricity. I have been working with electricity all
of my life and I used to work as an elctrician.

Have you heard Kevin Bloody Wilsons song about electricians?
Click to expand...
Hmmm...a licenced electrician once told me, emphatically, that, no
matter whether the ground on the plug was on the top or bottom, it
didn't affect which side the white and black wires were attached to...
:-(

Tom

I hate how you just insult me like I am an idiot.

But you are.... You are......

FFS don't ever take up working with gas supplies.....
Click to expand...
 
Thats sad.

"Tom MacIntyre" <tom__macintyre@hotmail.com> wrote in message
news:cekdk15gf8mdk5e6bunsissvna9oilfcl5@4ax.com...
On 7 Oct 2005 12:31:33 -0700, "Just Another Theremin Fan"
dcjtee@aol.com> wrote:


Michael Kennedy wrote:
I'm a college student and I am a computer tech and I do my job quite
well.

But you don't know a cathode from an anode? Gee that's some college you
go to!
There's multiple choice education for you.... How do you manage to get
positive and negative the right way around?


I am very careful with electricity. I have been working with electricity
all
of my life and I used to work as an elctrician.

Have you heard Kevin Bloody Wilsons song about electricians?

Hmmm...a licenced electrician once told me, emphatically, that, no
matter whether the ground on the plug was on the top or bottom, it
didn't affect which side the white and black wires were attached to...
:-(

Tom


I hate how you just insult me like I am an idiot.

But you are.... You are......

FFS don't ever take up working with gas supplies.....
Click to expand...
 
What did I do to you? I came here to ask for help and all i get is FLAMES!
Geez.
And then to call me an Idiot, you don't even know me. Like I said I don't
know everything there is to know and I'm trying to learn, but from what I
can see nobody wants to help out anyone in this group..

"Just Another Theremin Fan" <dcjtee@aol.com> wrote in message
news:1128713493.300364.102170@o13g2000cwo.googlegroups.com...
Michael Kennedy wrote:
I'm a college student and I am a computer tech and I do my job quite
well.

But you don't know a cathode from an anode? Gee that's some college you
go to!
There's multiple choice education for you.... How do you manage to get
positive and negative the right way around?


I am very careful with electricity. I have been working with electricity
all
of my life and I used to work as an elctrician.

Have you heard Kevin Bloody Wilsons song about electricians?

I hate how you just insult me like I am an idiot.

But you are.... You are......

FFS don't ever take up working with gas supplies.....
Click to expand...
 
On Fri, 7 Oct 2005 15:57:17 -0400, "Michael Kennedy"
<Mikek400@remthis.comcast.net> wrote:

Thats sad.
Click to expand...
Not to mention scary...

Tom

"Tom MacIntyre" <tom__macintyre@hotmail.com> wrote in message
news:cekdk15gf8mdk5e6bunsissvna9oilfcl5@4ax.com...
On 7 Oct 2005 12:31:33 -0700, "Just Another Theremin Fan"
dcjtee@aol.com> wrote:


Michael Kennedy wrote:
I'm a college student and I am a computer tech and I do my job quite
well.

But you don't know a cathode from an anode? Gee that's some college you
go to!
There's multiple choice education for you.... How do you manage to get
positive and negative the right way around?


I am very careful with electricity. I have been working with electricity
all
of my life and I used to work as an elctrician.

Have you heard Kevin Bloody Wilsons song about electricians?

Hmmm...a licenced electrician once told me, emphatically, that, no
matter whether the ground on the plug was on the top or bottom, it
didn't affect which side the white and black wires were attached to...
:-(

Tom


I hate how you just insult me like I am an idiot.

But you are.... You are......

FFS don't ever take up working with gas supplies.....
Click to expand...
 
On 7 Oct 2005 12:31:33 -0700, "Just Another Theremin Fan"
<dcjtee@aol.com> wrote:

Michael Kennedy wrote:
I'm a college student and I am a computer tech and I do my job quite well.

But you don't know a cathode from an anode? Gee that's some college you
go to!
There's multiple choice education for you.... How do you manage to get
positive and negative the right way around?
Click to expand...
This has gone a bit far...if he isn't in college to study electronics,
whay would you expect him to remember a word related to it? Even Ben
Franklin got positive and negative wrong, and it's been a source of
confusion for electronics education ever since. His explanation for
his use of the word "cathode" was reasonable.

I know we all care about safety and liability here, but this guy has
already passed my test. Model and chassis number, plus the month of
manufacture, shows he "knows the drill".

Michael...what test equipment do you have? There are a number of
things that could cause what you have described (weak capacitors being
right up there, given its age). Have you done any measurements? A 1987
TV, it's likely an Admiral chassis, I think (?).

Tom

I am very careful with electricity. I have been working with electricity all
of my life and I used to work as an elctrician.

Have you heard Kevin Bloody Wilsons song about electricians?

I hate how you just insult me like I am an idiot.

But you are.... You are......

FFS don't ever take up working with gas supplies.....
Click to expand...
 
Hmmm...a licenced electrician once told me, emphatically, that, no
matter whether the ground on the plug was on the top or bottom, it
didn't affect which side the white and black wires were attached to...


FFS don't ever take up working with gas supplies.....
Click to expand...
LOL I understand that a few years ago in London that one of these
college educated "electricians" wired up two of the stars of a 3 phase
supply feeding the lift system to the domestic supply in an 18 storey
block of flats!

Smoke could be seen for miles around!
 
Michael Kennedy wrote:
What did I do to you? I came here to ask for help and all i get is FLAMES!
Geez.
And then to call me an Idiot, you don't even know me. Like I said I don't
know everything there is to know and I'm trying to learn, but from what I
can see nobody wants to help out anyone in this group..
Click to expand...
Bet any money you like that by this time next week you will know the
difference between an anode and a cathode. How's that for help? ;-)
 
it's been a source of
confusion for electronics education ever since. His explanation for
his use of the word "cathode" was reasonable.
Click to expand...
No it wasn't but I do appreciate your "which way does electricity flow"
point Tom.

It is a very old and basic argument which after a lifetime of
electronics, I can never answer but an anode is still connected to the
electron surplus.

Dave
 
On 7 Oct 2005 13:43:03 -0700, "Just Another Theremin Fan"
<dcjtee@aol.com> wrote:

it's been a source of
confusion for electronics education ever since. His explanation for
his use of the word "cathode" was reasonable.

No it wasn't but I do appreciate your "which way does electricity flow"
point Tom.

It is a very old and basic argument which after a lifetime of
electronics, I can never answer but an anode is still connected to the
electron surplus.

Dave
Click to expand...
Just to add to this discussion...I always used the word "pancreas" to
help me remember...PositiveAnodeNegativeCathodeREAS.

We apparently agree to disagree...about Michael, but not about which
way the electrons flow.

Tom
 
We apparently agree to disagree...about Michael, but not about which
way the electrons flow.

Tom
Click to expand...
I wonder how these kids would have got on playing with EHT pumped
straight out of a 50 Hz mains tranformer at several mA?

Loads of fun!
 
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