Panasonic TV won't power up

S

Smitty Two

Guest
So the g.f. says her bedroom TV won't turn on. If she hits the momentary
on/off button on either the TV or the remote, the green power indicator
lights briefly but goes out again immediately. It's a 1991 Panasonic 19"
CRT, model # CTN1956R.

She's coming down (300 miles) this weekend and will bring the thing with
her if there's a reasonable chance that I can fix it fairly readily and
for little if any money, with some help from the group of course. At the
moment I'm not gainfully employed so my time is free anyway.

I can solder and use basic test equipment and sort out ohm's law and
stay away from charged capacitors, but my AS degree in electronics
technology is rusty.

Obviously a 19" CRT is virtually worthless, and if this isn't a fairly
obvious fault we'll pick up another one free or cheap, or upgrade to an
LCD. So feedback of any appropriate nature is welcome.
 
On Thu, 17 Sep 2009 22:18:31 -0700, Smitty Two
<prestwhich@earthlink.net> wrote:

So the g.f. says her bedroom TV won't turn on. If she hits the momentary
on/off button on either the TV or the remote, the green power indicator
lights briefly but goes out again immediately. It's a 1991 Panasonic 19"
CRT, model # CTN1956R.

She's coming down (300 miles) this weekend and will bring the thing with
her if there's a reasonable chance that I can fix it fairly readily and
for little if any money, with some help from the group of course. At the
moment I'm not gainfully employed so my time is free anyway.

I can solder and use basic test equipment and sort out ohm's law and
stay away from charged capacitors, but my AS degree in electronics
technology is rusty.

Obviously a 19" CRT is virtually worthless, and if this isn't a fairly
obvious fault we'll pick up another one free or cheap, or upgrade to an
LCD. So feedback of any appropriate nature is welcome.
Click to expand...
I had a Panasonic that did this after a static discharge upon
manually turning off. It fixed itself only after I left it unplugged
for a short while.
 
Smitty Two <prestwhich@earthlink.net> wrote in news:prestwhich-
EF8580.22183117092009@newsfarm.iad.highwinds-media.com:

So the g.f. says her bedroom TV won't turn on. If she hits the momentary
on/off button on either the TV or the remote, the green power indicator
lights briefly but goes out again immediately. It's a 1991 Panasonic 19"
CRT, model # CTN1956R.

She's coming down (300 miles) this weekend and will bring the thing with
her if there's a reasonable chance that I can fix it fairly readily and
for little if any money, with some help from the group of course. At the
moment I'm not gainfully employed so my time is free anyway.

I can solder and use basic test equipment and sort out ohm's law and
stay away from charged capacitors, but my AS degree in electronics
technology is rusty.

Obviously a 19" CRT is virtually worthless, and if this isn't a fairly
obvious fault we'll pick up another one free or cheap, or upgrade to an
LCD. So feedback of any appropriate nature is welcome.
Click to expand...
electrolytic caps;bad ESR.
look for discolored or swollen caps,and a ESR meter would be very handy.
a DMM isn't much use for checking caps with bad ESR.

--
Jim Yanik
jyanik
at
kua.net
 
On Thu, 17 Sep 2009 22:18:31 -0700, Smitty Two
<prestwhich@earthlink.net>wrote:

So the g.f. says her bedroom TV won't turn on. If she hits the momentary
on/off button on either the TV or the remote, the green power indicator
lights briefly but goes out again immediately. It's a 1991 Panasonic 19"
CRT, model # CTN1956R.

She's coming down (300 miles) this weekend and will bring the thing with
her if there's a reasonable chance that I can fix it fairly readily and
for little if any money, with some help from the group of course. At the
moment I'm not gainfully employed so my time is free anyway.

I can solder and use basic test equipment and sort out ohm's law and
stay away from charged capacitors, but my AS degree in electronics
technology is rusty.

Obviously a 19" CRT is virtually worthless, and if this isn't a fairly
obvious fault we'll pick up another one free or cheap, or upgrade to an
LCD. So feedback of any appropriate nature is welcome.
Click to expand...
Buy your GF a new tv.
 
"Jim Yanik" <jyanik@abuse.gov> wrote in message
news:Xns9C8A571BC4608jyanikkuanet@74.209.136.86...
Smitty Two <prestwhich@earthlink.net> wrote in news:prestwhich-
EF8580.22183117092009@newsfarm.iad.highwinds-media.com:

So the g.f. says her bedroom TV won't turn on. If she hits the momentary
on/off button on either the TV or the remote, the green power indicator
lights briefly but goes out again immediately. It's a 1991 Panasonic 19"
CRT, model # CTN1956R.

She's coming down (300 miles) this weekend and will bring the thing with
her if there's a reasonable chance that I can fix it fairly readily and
for little if any money, with some help from the group of course. At the
moment I'm not gainfully employed so my time is free anyway.

I can solder and use basic test equipment and sort out ohm's law and
stay away from charged capacitors, but my AS degree in electronics
technology is rusty.

Obviously a 19" CRT is virtually worthless, and if this isn't a fairly
obvious fault we'll pick up another one free or cheap, or upgrade to an
LCD. So feedback of any appropriate nature is welcome.


electrolytic caps;bad ESR.
look for discolored or swollen caps,and a ESR meter would be very handy.
a DMM isn't much use for checking caps with bad ESR.

--
Jim Yanik
jyanik
at
kua.net
Click to expand...
Agreed. Also look for bad joints on the field output chip.

Arfa
 
On Thu, 17 Sep 2009 22:18:31 -0700, Smitty Two
<prestwhich@earthlink.net> wrote:

So the g.f. says her bedroom TV won't turn on. If she hits the momentary
on/off button on either the TV or the remote, the green power indicator
lights briefly but goes out again immediately. It's a 1991 Panasonic 19"
CRT, model # CTN1956R.

She's coming down (300 miles) this weekend and will bring the thing with
her if there's a reasonable chance that I can fix it fairly readily and
for little if any money, with some help from the group of course. At the
moment I'm not gainfully employed so my time is free anyway.

I can solder and use basic test equipment and sort out ohm's law and
stay away from charged capacitors, but my AS degree in electronics
technology is rusty.

Obviously a 19" CRT is virtually worthless, and if this isn't a fairly
obvious fault we'll pick up another one free or cheap, or upgrade to an
LCD. So feedback of any appropriate nature is welcome.
I think your last paragraph says it all. The TV is 19 years old. IF
Click to expand...
you knew what values of caps were used in the power supply secondary
you could replace the lot and have a good chance of fixing it.
Without that information it is unlikely you would be able to fix it in
a weekend.

A few hours spent perusing your local Craigslist's electronics
section will likely turn up a newer, working TV for little more than
the cost of repairing the Panasonic. Ideally, this would leave time
for other, more pleasant passtimes. Such as watching the WNBA
playoffs.

I'm of two minds about upgrading to LCD at this time. I recently
purchased a new Sony 19" LCD tv. The retailer provided a 5 year
warranty. I think it very unlikely the TV will last 5 years. In
another 5 years I am confident a more reliable set will be available
for less money.

PlainBill
 
PlainBill47@yahoo.com wrote in
news:etk7b51hllhj2oitctljs14oan20grhn83@4ax.com:

On Thu, 17 Sep 2009 22:18:31 -0700, Smitty Two
prestwhich@earthlink.net> wrote:

So the g.f. says her bedroom TV won't turn on. If she hits the momentary
on/off button on either the TV or the remote, the green power indicator
lights briefly but goes out again immediately. It's a 1991 Panasonic 19"
CRT, model # CTN1956R.

She's coming down (300 miles) this weekend and will bring the thing with
her if there's a reasonable chance that I can fix it fairly readily and
for little if any money, with some help from the group of course. At the
moment I'm not gainfully employed so my time is free anyway.

I can solder and use basic test equipment and sort out ohm's law and
stay away from charged capacitors, but my AS degree in electronics
technology is rusty.

Obviously a 19" CRT is virtually worthless, and if this isn't a fairly
obvious fault we'll pick up another one free or cheap, or upgrade to an
LCD. So feedback of any appropriate nature is welcome.
I think your last paragraph says it all. The TV is 19 years old. IF
you knew what values of caps were used in the power supply secondary
you could replace the lot and have a good chance of fixing it.
Without that information it is unlikely you would be able to fix it in
a weekend.

A few hours spent perusing your local Craigslist's electronics
section will likely turn up a newer, working TV for little more than
the cost of repairing the Panasonic. Ideally, this would leave time
for other, more pleasant passtimes. Such as watching the WNBA
playoffs.

I'm of two minds about upgrading to LCD at this time. I recently
purchased a new Sony 19" LCD tv. The retailer provided a 5 year
warranty. I think it very unlikely the TV will last 5 years. In
another 5 years I am confident a more reliable set will be available
for less money.

PlainBill
Click to expand...
I just picked up,from the trash,a 13" TV built in 1989,and it runs great.
I use it with one of my ATSC converters.
I also had a "recycled" 1986 12" TV that had a great CRT pic,but the cold
solder joints became too much a problem,so I replaced it with the 13."

--
Jim Yanik
jyanik
at
kua.net
 
In article <34slaa.1h4.17.15@news.alt.net>,
Meat Plow <meat@petitmorte.net> wrote:

On Thu, 17 Sep 2009 22:18:31 -0700, Smitty Two
prestwhich@earthlink.net>wrote:

So the g.f. says her bedroom TV won't turn on. If she hits the momentary
on/off button on either the TV or the remote, the green power indicator
lights briefly but goes out again immediately. It's a 1991 Panasonic 19"
CRT, model # CTN1956R.

She's coming down (300 miles) this weekend and will bring the thing with
her if there's a reasonable chance that I can fix it fairly readily and
for little if any money, with some help from the group of course. At the
moment I'm not gainfully employed so my time is free anyway.

I can solder and use basic test equipment and sort out ohm's law and
stay away from charged capacitors, but my AS degree in electronics
technology is rusty.

Obviously a 19" CRT is virtually worthless, and if this isn't a fairly
obvious fault we'll pick up another one free or cheap, or upgrade to an
LCD. So feedback of any appropriate nature is welcome.

Buy your GF a new tv.
Click to expand...
Yes, well, your response was voted "Best Choice" by the Usenet Inquiry
Response Evaluation Committee, otherwise known as my girlfriend.

Thanks to all for your suggestions. The TV is working. I intentionally
waited several days to post this follow-up, and the problem has not
reappeared. Since it wasn't intermittent before, I'm reasonably sure the
problem isn't going to resurface.

However, it would be a little inaccurate to say that I "repaired" it. I
did blow 18 years worth of accumulated dust out of it, and remarked to
her at the time that I thought there was a 50/50 chance that that might
be all it needed.

While I had the back off, I inspected the board topside for any bulging
caps or other visual signs of component problems. And I pulled the board
out far enough to check the solder side thoroughly for any cracked
joints. Finding no visual problems, I decided that it was either going
to work or not, but that's about all the time it was worth.

So I lucked out on the 50/50 bet and it cost me little time and no money
to be the hero again.
 
"Smitty Two" <prestwhich@earthlink.net> wrote in message
news:prestwhich-07920A.00211724092009@newsfarm.iad.highwinds-media.com...
In article <34slaa.1h4.17.15@news.alt.net>,
Meat Plow <meat@petitmorte.net> wrote:

On Thu, 17 Sep 2009 22:18:31 -0700, Smitty Two
prestwhich@earthlink.net>wrote:

So the g.f. says her bedroom TV won't turn on. If she hits the momentary
on/off button on either the TV or the remote, the green power indicator
lights briefly but goes out again immediately. It's a 1991 Panasonic 19"
CRT, model # CTN1956R.

She's coming down (300 miles) this weekend and will bring the thing with
her if there's a reasonable chance that I can fix it fairly readily and
for little if any money, with some help from the group of course. At the
moment I'm not gainfully employed so my time is free anyway.

I can solder and use basic test equipment and sort out ohm's law and
stay away from charged capacitors, but my AS degree in electronics
technology is rusty.

Obviously a 19" CRT is virtually worthless, and if this isn't a fairly
obvious fault we'll pick up another one free or cheap, or upgrade to an
LCD. So feedback of any appropriate nature is welcome.

Buy your GF a new tv.

Yes, well, your response was voted "Best Choice" by the Usenet Inquiry
Response Evaluation Committee, otherwise known as my girlfriend.

Thanks to all for your suggestions. The TV is working. I intentionally
waited several days to post this follow-up, and the problem has not
reappeared. Since it wasn't intermittent before, I'm reasonably sure the
problem isn't going to resurface.

However, it would be a little inaccurate to say that I "repaired" it. I
did blow 18 years worth of accumulated dust out of it, and remarked to
her at the time that I thought there was a 50/50 chance that that might
be all it needed.

While I had the back off, I inspected the board topside for any bulging
caps or other visual signs of component problems. And I pulled the board
out far enough to check the solder side thoroughly for any cracked
joints. Finding no visual problems, I decided that it was either going
to work or not, but that's about all the time it was worth.

So I lucked out on the 50/50 bet and it cost me little time and no money
to be the hero again.
Click to expand...

Good luck - but this only suggests to me that yours is an intermittent
problem - bound to recur.

Mark Z.
 
In article <00372153$0$13397$c3e8da3@news.astraweb.com>,
"Mark Zacharias" <mark_zacharias@sbclobal.net> wrote:

"Smitty Two" <prestwhich@earthlink.net> wrote in message
news:prestwhich-07920A.00211724092009@newsfarm.iad.highwinds-media.com...
In article <34slaa.1h4.17.15@news.alt.net>,
Meat Plow <meat@petitmorte.net> wrote:

On Thu, 17 Sep 2009 22:18:31 -0700, Smitty Two
prestwhich@earthlink.net>wrote:

So the g.f. says her bedroom TV won't turn on. If she hits the momentary
on/off button on either the TV or the remote, the green power indicator
lights briefly but goes out again immediately. It's a 1991 Panasonic 19"
CRT, model # CTN1956R.

She's coming down (300 miles) this weekend and will bring the thing with
her if there's a reasonable chance that I can fix it fairly readily and
for little if any money, with some help from the group of course. At the
moment I'm not gainfully employed so my time is free anyway.

I can solder and use basic test equipment and sort out ohm's law and
stay away from charged capacitors, but my AS degree in electronics
technology is rusty.

Obviously a 19" CRT is virtually worthless, and if this isn't a fairly
obvious fault we'll pick up another one free or cheap, or upgrade to an
LCD. So feedback of any appropriate nature is welcome.

Buy your GF a new tv.

Yes, well, your response was voted "Best Choice" by the Usenet Inquiry
Response Evaluation Committee, otherwise known as my girlfriend.

Thanks to all for your suggestions. The TV is working. I intentionally
waited several days to post this follow-up, and the problem has not
reappeared. Since it wasn't intermittent before, I'm reasonably sure the
problem isn't going to resurface.

However, it would be a little inaccurate to say that I "repaired" it. I
did blow 18 years worth of accumulated dust out of it, and remarked to
her at the time that I thought there was a 50/50 chance that that might
be all it needed.

While I had the back off, I inspected the board topside for any bulging
caps or other visual signs of component problems. And I pulled the board
out far enough to check the solder side thoroughly for any cracked
joints. Finding no visual problems, I decided that it was either going
to work or not, but that's about all the time it was worth.

So I lucked out on the 50/50 bet and it cost me little time and no money
to be the hero again.


Good luck - but this only suggests to me that yours is an intermittent
problem - bound to recur.

Mark Z.
Click to expand...
FWIW, it's now been two months with no recurrence. The TV is used at
least twice daily.
 
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