NEC tv 'ticking'

[evil bob]

Hello all;

I have a NEC TV, model fs-5185 (51 cm) that over the last couple of months
has a wierd fault of intermittently making a 'ticking' noise, and the screen
flickers and dots appear on the screen as it does it. I can't isolate it to
any particular situation, it does it on all channels, on all video modes, on
warm days, cold days, whatever. Sometimes it does it so frequently it is
impossible to watch! It seems - at a guess the HT power supply
intermittently failing?

Any ideas out there? The tv is only a few years old, so I don't want to
ditch it yet. I am thinking of taking it to an experienced tv repairman, but
I am concerned about the repair cost being more than the price of a new set
with the faultfinding for this fault.

Thanks in advance!

Ian

 

[Phil Allison]

"evil bob" <Stuff@all.com> wrote in message
news:bdk03a$9je$1@yeppa.connect.com.au...

Hello all;

I have a NEC TV, model fs-5185 (51 cm) that over the last couple of
months
has a wierd fault of intermittently making a 'ticking' noise, and the
screen
flickers and dots appear on the screen as it does it. I can't isolate it
to
any particular situation, it does it on all channels, on all video modes,
on
warm days, cold days, whatever. Sometimes it does it so frequently it is
impossible to watch! It seems - at a guess the HT power supply
intermittently failing?

Any ideas out there? The tv is only a few years old, so I don't want to
ditch it yet. I am thinking of taking it to an experienced tv repairman,
but
I am concerned about the repair cost being more than the price of a new
set
with the faultfinding for this fault.

** Might just need a good clean up around the tube and EHT sections.

Metho and some tissue works well.



............ Phil

 

[Hairy Plotter]

From experience, and general opinion on the newsgroup,
get it repaired, or at least checked, immediately before this minor ticking
becomes a serious and costly KERSPLAT !! (yes, it did sound like a KERSPLAT
!!)
Personal experience speaking here, TV still in corner awaiting my amateur
time to look at it, while watching a lesser quality spare TV.

Hairy_Plotter

"evil bob" <Stuff@all.com> wrote in message
news:bdk03a$9je$1@yeppa.connect.com.au...

Hello all;

I have a NEC TV, model fs-5185 (51 cm) that over the last couple of
months
has a wierd fault of intermittently making a 'ticking' noise, and the
screen
flickers and dots appear on the screen as it does it. I can't isolate it
to
any particular situation, it does it on all channels, on all video modes,
on
warm days, cold days, whatever. Sometimes it does it so frequently it is
impossible to watch! It seems - at a guess the HT power supply
intermittently failing?

Any ideas out there? The tv is only a few years old, so I don't want to
ditch it yet. I am thinking of taking it to an experienced tv repairman,
but
I am concerned about the repair cost being more than the price of a new
set
with the faultfinding for this fault.

Thanks in advance!

Ian

 

[evil bob]

Kersplat...hmmm.....sounds bad and smoky.

I'll have a crack at it with the electronic cleaning spray? I would imagine
there is a lot of dust and crap in there.

Thanks

Ian



"Hairy Plotter" <hairy_plotter@ihug.com.au> wrote in message
news:bdk0g7$aia$1@lust.ihug.co.nz...

From experience, and general opinion on the newsgroup,
get it repaired, or at least checked, immediately before this minor
ticking
becomes a serious and costly KERSPLAT !! (yes, it did sound like a
KERSPLAT
!!)
Personal experience speaking here, TV still in corner awaiting my amateur
time to look at it, while watching a lesser quality spare TV.

Hairy_Plotter

 

[Phil Allison]

"evil bob" <Stuff@all.com> wrote in message
news:bdk196$a26$1@yeppa.connect.com.au...

Kersplat...hmmm.....sounds bad and smoky.

I'll have a crack at it with the electronic cleaning spray? I would
imagine
there is a lot of dust and crap in there.

** Try a vacuum cleaner and a soft paint brush first - then use a rag
or tissue dipped in metho to clean around the back of the tube and EHT
wires.

Forget the solvent sprays - it is only house dust and carbonised
dust.



............ Phil

 

[evil bob]

Ahhh...I am in the electrical industry, but TV's are a bit of a mystery.
Anything I should be aware of, Zappage wise- aside fom the normal 240v
stuff. What should I avoid around the eht? Or is this more of a job for mr
tvrepair man?

Ian



"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3efd898e$0$5431$afc38c87@news.optusnet.com.au...

"evil bob" <Stuff@all.com> wrote in message
news:bdk196$a26$1@yeppa.connect.com.au...
Kersplat...hmmm.....sounds bad and smoky.

I'll have a crack at it with the electronic cleaning spray? I would
imagine
there is a lot of dust and crap in there.


** Try a vacuum cleaner and a soft paint brush first - then use a rag
or tissue dipped in metho to clean around the back of the tube and EHT
wires.

Forget the solvent sprays - it is only house dust and carbonised
dust.



........... Phil

 

[Craig Rodgers]

Also take care as the tube it self can acts a very high voltage (+20kV ish)
capacitor. You have to really try to get a belt from it but the capacitance
is there, it's in the order of a few hundred Picofarads so if you are
talented it probably wont kill you but it leave you sore for a bit



If in doubt take it to a service man. most of the ones I've every spoken to
don't really like fixing TV's & Video's after amateurs have "had a go",
although that never really stoped me



Craig





"evil bob" <Stuff@all.com> wrote in message
news:bdk26b$ag2$1@yeppa.connect.com.au...

Ahhh...I am in the electrical industry, but TV's are a bit of a mystery.
Anything I should be aware of, Zappage wise- aside fom the normal 240v
stuff. What should I avoid around the eht? Or is this more of a job for mr
tvrepair man?

Ian



"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3efd898e$0$5431$afc38c87@news.optusnet.com.au...

"evil bob" <Stuff@all.com> wrote in message
news:bdk196$a26$1@yeppa.connect.com.au...
Kersplat...hmmm.....sounds bad and smoky.

I'll have a crack at it with the electronic cleaning spray? I would
imagine
there is a lot of dust and crap in there.


** Try a vacuum cleaner and a soft paint brush first - then use a
rag
or tissue dipped in metho to clean around the back of the tube and EHT
wires.

Forget the solvent sprays - it is only house dust and
carbonised
dust.



........... Phil

 

[null&void]

On Sat, 28 Jun 2003 22:50:35 +1000, "Phil Allison"
<philallison@optusnet.com.au> wrote:

** Do not touch any of the parts if the set is plugged in.

The EHT parts act like a cap and will still be charged with the set
disconnected.

http://www.repairfaq.org/REPAIR/F_monfaq3.html#MONFAQ_003

6.6 and 6.7 are of interest.

 

[Phil Allison]

"null&void" <null&void@> wrote in message
news:6k9sfvcdmrj495d3rp51l7agvoq37vbqhn@4ax.com...

On Sat, 28 Jun 2003 22:50:35 +1000, "Phil Allison"
philallison@optusnet.com.au> wrote:

** Do not touch any of the parts if the set is plugged in.

The EHT parts act like a cap and will still be charged with the set
disconnected.

** Not usually true for a working set.

After switch off the EHT is drained by the tube itself still
drawing current since the 3 electron gun cathodes remain hot for a few
seconds.

Plus contact with the EHT is near impossible unless you pull out the
ultor plug.



................. Phil

 

[Andy, The Real]

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3efe3c4a$0$5433$afc38c87@news.optusnet.com.au...

"null&void" <null&void@> wrote in message
news:6k9sfvcdmrj495d3rp51l7agvoq37vbqhn@4ax.com...
On Sat, 28 Jun 2003 22:50:35 +1000, "Phil Allison"
philallison@optusnet.com.au> wrote:

** Do not touch any of the parts if the set is plugged in.

The EHT parts act like a cap and will still be charged with the set
disconnected.



** Not usually true for a working set.

After switch off the EHT is drained by the tube itself still
drawing current since the 3 electron gun cathodes remain hot for a few
seconds.

Its the tube that can hold the charge.

Plus contact with the EHT is near impossible unless you pull out
the
ultor plug.

Pull out the ultor cap and the tube becomes exposed. The problem that the OP
mentioned sounds very much like EHT problems, probably the LOPT arcing which
will require the ultor cap to be removed. Follow your own advice phil, dont
fuck with it if you dont know what your doing.

 

[Phil Allison]

"Andy, The Real" <ihatehifitrolls@yahoo.com.au> wrote in message
news:3efe99df$0$30817$afc38c87@news.optusnet.com.au...

Its the tube that can hold the charge.

** Are you drunk again ?? The + charge on the inside of the CRT
discharges via the - charged electron beam which comes from the 3 cathodes
after switch off.

Plus contact with the EHT is near impossible unless you pull out
the > ultor plug.


Pull out the ultor cap and the tube becomes exposed. The problem that the
OP
mentioned sounds very much like EHT problems, probably the LOPT arcing
which
will require the ultor cap to be removed.

** Not probably - only possibly.

Leakage through accumulated dust amd carbonised dust around the EHT
supply cable and tube socket is a common problem - arcing is the
ymptom - mainly in humid / wet weather.

Also there are sometimes spark gaps on the tube neck PCB that need a
clean too.

Follow your own advice phil, dont fuck with it if you dont know what your
doing.

** Taking that advice would stop you dead in your tracks Andy.



............ Phil

 

[M.R.Van Luyn.]

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3efd8490$0$5428$afc38c87@news.optusnet.com.au...

** Might just need a good clean up around the tube and EHT sections.

Metho and some tissue works well.

Make sure you wait for the metho to evaporate first. I told a non technical

friend to fix his own telly this way, and he set the whole thing alight.
Woof...Mmmwww...panic!

Regards,
Murray.
_____________________________________
Murray R.Van Luyn
Revolutionary Urban Guerilla.
Ph: +618 9354 1375
E-mail: vanluynm@ses.curtin.edu.au
vanluynm@cs.curtin.edu.au

 

[KLR]

On Sat, 28 Jun 2003 23:14:33 +1000, "Craig Rodgers"
<craig@(remove.the.obvious).student.usyd.edu.au> wrote:

Also take care as the tube it self can acts a very high voltage (+20kV ish)
capacitor. You have to really try to get a belt from it but the capacitance
is there, it's in the order of a few hundred Picofarads so if you are
talented it probably wont kill you but it leave you sore for a bit



If in doubt take it to a service man. most of the ones I've every spoken to
don't really like fixing TV's & Video's after amateurs have "had a go",
although that never really stoped me



Craig


I don't know about modern sets or monitors - but with many of the 80's

models I worked on some years back - there was still quite a healthy
ZAP to be had from under that ultor cap for some time after turning
off power to the set/monitor. Some sets did - some didn;t. but
personally its not a chance I would take.

I even had several of these old computer monitors of the same model
that would run for about 30 seconds and then fail. Fault turned out
to be high voltage capacitors that had failed in the horizontal output
stage and caused the EHT to go sky high before the x=ray protection
cut in and killed power.

The zaps that came from a couple of these with this fault conditon
were amazing. in once case I saw a spark jump from under the sealed
ultor cap and across to the metalwork that supported the tube about
2-3 inch away from the cap edge.

These certainly went off with a bang when ultor discharged even after
power was removed. One even gave a nasty and painful shock (with the
mains removed) from putting my hand about an inch from the ultor cap

---------

Cleaning procedure I always followed was:

I would strongly advise earthing the ultor cap lead to the bare wire
that is spring loaded across the outside of the back of the tube. I
used a multimeter lead typically for this - slide the long probe end
under the cap and discharge.

Clean the hole, cap and surround thoroughly - immediately after
discharging and promptly replace the ultor lead in the hole.

Pull it gently afterwards to make sure it has locked into the hole
properly and won't fall out.

If it does fall - and lands on the PCB in the set - it might do a hell
of a lot of damage to components.

"evil bob" <Stuff@all.com> wrote in message
news:bdk26b$ag2$1@yeppa.connect.com.au...
Ahhh...I am in the electrical industry, but TV's are a bit of a mystery.
Anything I should be aware of, Zappage wise- aside fom the normal 240v
stuff. What should I avoid around the eht? Or is this more of a job for mr
tvrepair man?

Ian



"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3efd898e$0$5431$afc38c87@news.optusnet.com.au...

"evil bob" <Stuff@all.com> wrote in message
news:bdk196$a26$1@yeppa.connect.com.au...
Kersplat...hmmm.....sounds bad and smoky.

I'll have a crack at it with the electronic cleaning spray? I would
imagine
there is a lot of dust and crap in there.


** Try a vacuum cleaner and a soft paint brush first - then use a
rag
or tissue dipped in metho to clean around the back of the tube and EHT
wires.

Forget the solvent sprays - it is only house dust and
carbonised
dust.



........... Phil

 

[The Real Andy]

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3f002316$0$5430$afc38c87@news.optusnet.com.au...

"Andy, The Real" <ihatehifitrolls@yahoo.com.au> wrote in message
news:3f002036$0$26634$afc38c87@news.optusnet.com.au...
"Phil Allison" <philallison@optusnet.com.au> wrote in message
** Are you drunk again
Always drunk.
** Same now.
But wise enough to know you haven't been bitten by a charged
tube.
** You do not *know* any such thing.

So you have been bitten by a tube?? I guess you can get a shock from a tube
then. I guess its not safe to play with tv's after the switched off.

** Not probably - only possibly.

Leakage through accumulated dust amd carbonised dust around
the
EHT supply cable and tube socket is a common problem - arcing is the
symptom - mainly in humid / wet weather.
Sorry, i forgot you were a tv tech.
** Made my living at it once.

I find it hard to believe _you_ made a living from it.

Seen a few sets with the above problem too

Good for you.

Also there are sometimes spark gaps on the tube neck PCB that
need
a clean too.

Fuck your smart...
** Almost anyone is smarter than a drunk.

Almost anyone is smarter than a allison

One up on you my friend, I bet you I have fixed more TV's than you.
** So what - that does not my my post wrong.

It proves that you are a fuckwit.

All you know is pro(pathetic)audio crap.
** As if you have the faintest what I know.

I know that you are a moron and hypocrit.

Go hang out with you junkie roadie mates...

** Sorry - I do not know any roadies.

BTW Musos are the drug lovers - hard working roadies get sacked
if
ever found stoned.

Thats why you are not a roadie, got sacked cause your a junkie.

 

[Phil Allison]

"The Real Andy" <ihatehifitrolls@yahoo.com.au> wrote in message
news:3f01f9b0$0$31276$afc38c87@news.optusnet.com.au...

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3f002316$0$5430$afc38c87@news.optusnet.com.au...

"Andy, The Real" <ihatehifitrolls@yahoo.com.au> wrote in message
news:3f002036$0$26634$afc38c87@news.optusnet.com.au...
"Phil Allison" <philallison@optusnet.com.au> wrote in message
** Are you drunk again
Always drunk.
** Same now.
But wise enough to know you haven't been bitten by a charged
tube.
** You do not *know* any such thing.

So you have been bitten by a tube?? I guess you can get a shock from a
tube
then. I guess its not safe to play with tv's after the switched off.

** Not probably - only possibly.

Leakage through accumulated dust amd carbonised dust around
the
EHT supply cable and tube socket is a common problem - arcing is
the
symptom - mainly in humid / wet weather.
Sorry, i forgot you were a tv tech.
** Made my living at it once.

I find it hard to believe _you_ made a living from it.

Seen a few sets with the above problem too

Good for you.

Also there are sometimes spark gaps on the tube neck PCB
that
need
a clean too.

Fuck your smart...
** Almost anyone is smarter than a drunk.

Almost anyone is smarter than a allison

One up on you my friend, I bet you I have fixed more TV's than you.
** So what - that does not my my post wrong.

It proves that you are a fuckwit.

All you know is pro(pathetic)audio crap.
** As if you have the faintest what I know.

I know that you are a moron and hypocrit.

Go hang out with you junkie roadie mates...

** Sorry - I do not know any roadies.

BTW Musos are the drug lovers - hard working roadies get
sacked
if
ever found stoned.

Thats why you are not a roadie, got sacked cause your a junkie

** Got a BAD hangover to today Andy ??



.......... Phil

 

[The Real Andy]

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3f021cdf$0$30821$afc38c87@news.optusnet.com.au...

<snipped phils dribble>

** Got a BAD hangover to today Andy ??

Not today Phil, been to lazy to go down to the bottleshop this last week.