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]

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]

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

 

[Phil Allison]

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

 

[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

 

[null&void]

** 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]

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]

** 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
**** with it if you dont know what your doing.

 

[Phil Allison]

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 **** 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.]

** 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: [email protected]
[email protected]

 

[The Real Andy]

** Same now.
But wise enough to know you haven't been bitten by a charged
** 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.

** 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.

** Almost anyone is smarter than a drunk.

Almost anyone is smarter than a allison

** So what - that does not my my post wrong.

It proves that you are a fuckwit.

** 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]

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.


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


Good for you.


Almost anyone is smarter than a allison


It proves that you are a fuckwit.


I know that you are a moron and hypocrit.
sacked

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

** Got a BAD hangover to today Andy ??



.......... Phil

 

[The Real Andy]

** Got a BAD hangover to today Andy ??

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