Toshiba TV29C90 problem; Image fades to black...

[Marsha]

When this first started happening, we would turn on the TV & it would turn
on in the correct picture, then pop out to the curved picture, then pop back
into the correct picture & pop in & out for a bit, then have a good
picture. We thought maybe it was a sensor problem. The curved picture is
on the whole screen. The color & picture are good, just some scenes have a
curved look if the scene has a door frame in it or something else in the
background that is supposed to be straight. Where the time is you can only
see the first number, the rest is cut off. Still don't won't to pay to have
it repaired. We can buy a new TV for $300.00. It won't be a large screen,
but with our recent experience with this RCA, we do not care to ever
purchase another big screen tv. Thanks to everyone for trying to help.
Marsha
"BobC" <lindabob2@worldnet.att.net> wrote in message
newsMi7b.134797$3o3.9568667@bgtnsc05-news.ops.worldnet.att.net...

I should have addressed a possible pincushion problem. You did not
mention were the curves were. If the picture is hour-glass shaped
(sides are bowed in) but the colors seemed ok; then you are talking
about a pincushion problem. In which case the cost of repair is
probably less.

If one or more of the colors are apparently misaligned with each other
then the problem is in the convergence amps or their power supply. In
this case, the bowing could be either or both in the horizontal or
vertical. The key is that the colors would be obviously messed up.

Marsha wrote:

Our RCA Big Screen Projection TV messed up right when the warranty
ended!
The picture looks curved now, you can still watch it. At first the good
screen would try to come in & the curved screen would try to come in, &
one
morning while watching we heard a lot of noise & now it is just the
curved
screen. Anyone know what went out & about how much to fix?
Thanks,
Marsha

 

[Damir]

On Tue, 9 Sep 2003 11:19:34 -0400, "Joe Brower" <joebrower3@comcast.net> wrote:

<snip>

I've looked at the unit and it appears that the only way to get to the
insides to see if I can tighten this assembly up will be a major
undertaking -- I'm not familiar with these devices and everything is so
interconnected, it appears like I would have to take the whole thing apart
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Yes.

just to get at the problem, something I'm willing to try if I can get some
advice and/or directions somewhere. I thought I'd give it a go before I
start calling around to find a tech who can A) do the job and B) not charge
an arm and a leg.

Start calling )

 

[Louie]

OK. i'll try to find my old scope.
louie

Tweetldee wrote:

I should have been more specific when I last responded to your questions.
Actually, measuring the DC level with a voltmeter isn't going to be really
accurate, since the sync levels will be obscured by the average-responding
voltmeter. You really need to look at the video there with a DC coupled
scope. Measure the tips and the porches of the sync pulses with the scope.
Then, we'll know what kind of gain and DC levels we'll need.
Cheers!!

 

[Patch]

"Joe Brower" <joebrower3@comcast.net> wrote in message
newsT-dncPq7Y95csCiXTWJig@comcast.com...

Howdy, folks;

I have a Sony CCD-TRV93 camcorder that's about five years old (bought it
new). In the last couple of weeks the red "start/stop" button on the rear
of the unit, along with the "Lock/Standby" lever that fits around its
base,
has become somewhat loose. As a result, it has become problematic with
getting the unit to switch between record and stop modes. Sometimes the
red
button does not want to depress, and you have to fiddle with the
"Lock/Standby" lever to get it to cooperate.

I've looked at the unit and it appears that the only way to get to the
insides to see if I can tighten this assembly up will be a major
undertaking -- I'm not familiar with these devices and everything is so
interconnected, it appears like I would have to take the whole thing apart
just to get at the problem, something I'm willing to try if I can get some
advice and/or directions somewhere. I thought I'd give it a go before I
start calling around to find a tech who can A) do the job and B) not
charge
an arm and a leg.

Any pointers? I'd sure appreciate it.

Thanks in advance for any help,

Joe Brower


Don't try to take apart without a service manual. If you care anything
about the camera, take it to a Tech.

 

[Patch]

"Alan Arnison" <alan.arnison@removethislineone.net> wrote in message
news:zVl7b.181$z06.181904@newsfep1-win.server.ntli.net...

I've recently purchased a new Toshiba TV 32ZP38 Picture Frame TV, which is
a
100hz model.

Since new there has been a problem with the displayed picture.

When the picture is still the image on screen is perfect, but when the
picture moves or a person within it moves the picture becomes variously,
blurred, out of focus, or watery for want of a better description; it
appears to shimmer. This is more apparent if the scene is outside.

An engineer from the dealer looked at it and declared all 100hz TV's to be
like this, which I find unbelievable.

Is there a problem with my TV which I have to live with or is a repair
required.

The engineer suggested that he could take the set to his workshop "to see
if
there is anything wrong with it" but I declined his offer as the set is so
new (8 weeks).



My apologies if this is not the right group to make this post but any help
would be appreciated.



When you bought the set was it first seen on display in the showroom? If
so, how did it look there? I would return to the showroom and have this so

called Tech demonstrate that all 100Hz sets are like this. I would be
demanding a new set.

 

[RJ]

How much is "a arm and a leg" ?

R

 

[N. Thornton]

"sam" <sammo2@hotmail.com> wrote in message news:<4QH6b.869$G1.5322@tor-nn1.netcom.ca>...

Hi

I have this old Sony 28" TV model KV-2780K ( bought it in the 1980's). The
RF input is no longer working; so I mainly use the Video input on the TV.

It has ben working ok all these year until 2 weeks ago when I noticed the
absence of blue color. For example, people wearing green Levi and green
shirts. I borrow and hook up another tv set and look at the two side by
side.

Everything else on the Sony looks good ( flesh tone etc.) except the blue is
replaced by green. sometimes I can still see blue in small area. The WHITE
looks white which means all primary colors are present.

BTW, the tint control has no effect at all.

I have a video card with a TV-Out connection to the TV. When I send a color
bar pattern from my computer to the TV, it displays correctly on TV. I dont
expect to get this fixed at a repair shop but just wonder if you expert can
suggest what the problems could be.

Hi. This doesnt make sense. The story shows the blue channel is down,
then you say a test card displays fine - does the testcard picture
include any blue? If not, your blue channel's down somewhere.

Its worth adjusting the blue channel presets inside to improve things
if you know how to do it safely, but do keep out if you dont.

If you dont know where to look to properly fix it, theres not much
point us telling you, as you wouldnt be able to do it.

BTW There are some wacky tricks that have been used in the past with 2
channel displays to give a better colour range.


Regards, NT

 

[RJ]

If the problem is the plastic sticking and some of the "button parts...you
will need to replace the assembly Part number X-3948-207-1. If the switch
itself is bad the part number is 1-475-619-11. Be careful with your
diagnosis...this can be a "tricky" repair. I hope this helps.

R

 

[mike]

wrote:

I am looking for a battery pack to retrofit to a Tektronix Model 326
O-Scope.

Any ideas?

Thx!!

http://groups.yahoo.com/group/TekScopes/
try there,
mike

--
Bunch of stuff For Sale and Wanted at the link below.
laptops and parts Test Equipment
4in/400Wout ham linear amp.
Honda CB-125S
400cc Dirt Bike 2003 miles $550
Police Scanner, Color LCD overhead projector
Tek 2465 $800, ham radio, 30pS pulser
Tektronix Concept Books, spot welding head...
http://www.geocities.com/SiliconValley/Monitor/4710/

 

[Curmudgeon]

Well, my son's now using a 46" RCA I bought in 1984....and it STILL looks
great...it just wouldn't die!!


"Marsha" <nospamplease@nosuchplace.com> wrote in message
news:jUl7b.967$5M.24618@dfw-read.news.verio.net...

When this first started happening, we would turn on the TV & it would turn
on in the correct picture, then pop out to the curved picture, then pop
back
into the correct picture & pop in & out for a bit, then have a good
picture. We thought maybe it was a sensor problem. The curved picture is
on the whole screen. The color & picture are good, just some scenes have
a
curved look if the scene has a door frame in it or something else in the
background that is supposed to be straight. Where the time is you can
only
see the first number, the rest is cut off. Still don't won't to pay to
have
it repaired. We can buy a new TV for $300.00. It won't be a large
screen,
but with our recent experience with this RCA, we do not care to ever
purchase another big screen tv. Thanks to everyone for trying to help.
Marsha
"BobC" <lindabob2@worldnet.att.net> wrote in message
newsMi7b.134797$3o3.9568667@bgtnsc05-news.ops.worldnet.att.net...
I should have addressed a possible pincushion problem. You did not
mention were the curves were. If the picture is hour-glass shaped
(sides are bowed in) but the colors seemed ok; then you are talking
about a pincushion problem. In which case the cost of repair is
probably less.

If one or more of the colors are apparently misaligned with each other
then the problem is in the convergence amps or their power supply. In
this case, the bowing could be either or both in the horizontal or
vertical. The key is that the colors would be obviously messed up.

Marsha wrote:

Our RCA Big Screen Projection TV messed up right when the warranty
ended!
The picture looks curved now, you can still watch it. At first the
good
screen would try to come in & the curved screen would try to come in,
&
one
morning while watching we heard a lot of noise & now it is just the
curved
screen. Anyone know what went out & about how much to fix?
Thanks,
Marsha

 

[Jeff]

Have you replaced all the surface mount caps and
repaired any damage
"Sidney" <sidneybek@yahoo.com> wrote in message
news:fecdbb87.0309090939.39adf085@posting.google.com...

I am presently working on a 1991 Nissan Pickup truck from Florida for
a customer which has a stock Clarion car stereo modelN-9497U and one
day both the AM & FM tuner reception disappeared,upon troubleshooting
I found a cracked solder on pin 21 of the tuner board so I resoldered
and I also found 4 visually leaky smt radial electrolytic capacitors
(three 1 Uf,50v and one 10 Uf,16v).I replaced all four but still AM or
FM reception.
After detailed troubleshooting I traced half of the pins as follows:

Corrected

Pin 1=AM in
Pin 2=FM in
Pin 3=GND
Pin 4=GND
Pin 5= AM-DX/LO
Pin 6=FM-DX/LO
Pin 7=FM B+ (8.6v)1
Pin 8=AM B+ (8.6v)1
Pin 9=FM VCC2
Pin 10=Band (5.3v)
Pin 11=R. B+ VCC com
Pin 12=AM osc
Pin 13 FM osc
Pin 14 tweet/ST
Pin 15 IF cont
Pin 16 RF mute
Pin 17=L ch
Pin 18=R ch
Pin 19=GND
Pin 20=AFC
Pin 21=S-meter

Many of the proper dc voltages are present but I need the schematic
diagram of the tuner so that I can pin point the culprit or does
anyone have a common history of failure for such a sympton?
You can e-mail me the tuner schematic at:

sidneybek@yahoo.com

Thanks for your time and effort.
Sidney
Dartmouth,Nova Scotia

 

[SJones]

"Turbo" <Turbo@roadrunner.nf.net> wrote in message news:<bjgk47$psu$1@nntp-stjh-01-01.rogers.nf.net>...

The first thing to do is clean & lube the
mode switch. Carefull of the mechanism
timing. Now, maybe the front buttons
aren't working. look for a "stuck" switch.
Turbo.

Interestingly... After I got to looking into the unit and studying it.
I noticed that the rubber pinch roller along with its steel drive
roller were quite dirty. So I buffed and cleaned them really well. I
cleaned the surface of the video drum real well too. After doing all
of this everything started working. I'm not exactly sure if this was
what did it or if it was the removal of the chassis and its reseating
into the control board that did the trick... but whatever it was it
works fine now.

Thank you for your interest Turbo!

 

[RJ]

You are right...in 1984 almost all sets were built well. But they are just
like VCR's...a $49.95 VCR will not last very long and there are very few
shops that will work on the "low-end" crap. I have a VCR made in 1986...it
is VHS/SVHS has HiFI heads and still works very well. Its initial cost was
$634.00. After ALL these years I WIN-----Wal Mart loses. I have NEVER under
stood this fact: Home electronics is the ONLY consumer product (including
Homes and Automobiles) that the price has gone down over the last 20 years.
Guess why? The QUALITY is gone in most cases. These broke, in debt, overpaid
yuppie wantabes that make up MOST of the consumer market can't afford
QUALITY in MOST cases.

R

 

[Marsha]

LOL wish ours hadn't of croaked!
"Curmudgeon" <curmudgeon@noway.com> wrote in message
news:cjt7b.10528$b6.1228@bignews1.bellsouth.net...

Well, my son's now using a 46" RCA I bought in 1984....and it STILL looks
great...it just wouldn't die!!


"Marsha" <nospamplease@nosuchplace.com> wrote in message
news:jUl7b.967$5M.24618@dfw-read.news.verio.net...
When this first started happening, we would turn on the TV & it would
turn
on in the correct picture, then pop out to the curved picture, then pop
back
into the correct picture & pop in & out for a bit, then have a good
picture. We thought maybe it was a sensor problem. The curved picture
is
on the whole screen. The color & picture are good, just some scenes
have
a
curved look if the scene has a door frame in it or something else in the
background that is supposed to be straight. Where the time is you can
only
see the first number, the rest is cut off. Still don't won't to pay to
have
it repaired. We can buy a new TV for $300.00. It won't be a large
screen,
but with our recent experience with this RCA, we do not care to ever
purchase another big screen tv. Thanks to everyone for trying to help.
Marsha
"BobC" <lindabob2@worldnet.att.net> wrote in message
newsMi7b.134797$3o3.9568667@bgtnsc05-news.ops.worldnet.att.net...
I should have addressed a possible pincushion problem. You did not
mention were the curves were. If the picture is hour-glass shaped
(sides are bowed in) but the colors seemed ok; then you are talking
about a pincushion problem. In which case the cost of repair is
probably less.

If one or more of the colors are apparently misaligned with each other
then the problem is in the convergence amps or their power supply. In
this case, the bowing could be either or both in the horizontal or
vertical. The key is that the colors would be obviously messed up.

Marsha wrote:

Our RCA Big Screen Projection TV messed up right when the warranty
ended!
The picture looks curved now, you can still watch it. At first the
good
screen would try to come in & the curved screen would try to come
in,
&
one
morning while watching we heard a lot of noise & now it is just the
curved
screen. Anyone know what went out & about how much to fix?
Thanks,
Marsha

 

[Marsha]

Well, we bought the RCA knowing they had a bad rep. We had to see for
ourselves, now we know, never again will we buy another Big Screen TV,
regardless of price.
"RJ" <joanrex@sbcglobal.net> wrote in message
news:dfu7b.756$B_.682@newssvr24.news.prodigy.com...

You are right...in 1984 almost all sets were built well. But they are just
like VCR's...a $49.95 VCR will not last very long and there are very few
shops that will work on the "low-end" crap. I have a VCR made in 1986...it
is VHS/SVHS has HiFI heads and still works very well. Its initial cost was
$634.00. After ALL these years I WIN-----Wal Mart loses. I have NEVER
under
stood this fact: Home electronics is the ONLY consumer product (including
Homes and Automobiles) that the price has gone down over the last 20
years.
Guess why? The QUALITY is gone in most cases. These broke, in debt,
overpaid
yuppie wantabes that make up MOST of the consumer market can't afford
QUALITY in MOST cases.

R

 

[Marsha]

LOL wish ours hadn't of croaked!
"Curmudgeon" <curmudgeon@noway.com> wrote in message
news:cjt7b.10528$b6.1228@bignews1.bellsouth.net...

Well, my son's now using a 46" RCA I bought in 1984....and it STILL looks
great...it just wouldn't die!!


"Marsha" <nospamplease@nosuchplace.com> wrote in message
news:jUl7b.967$5M.24618@dfw-read.news.verio.net...
When this first started happening, we would turn on the TV & it would
turn
on in the correct picture, then pop out to the curved picture, then pop
back
into the correct picture & pop in & out for a bit, then have a good
picture. We thought maybe it was a sensor problem. The curved picture
is
on the whole screen. The color & picture are good, just some scenes
have
a
curved look if the scene has a door frame in it or something else in the
background that is supposed to be straight. Where the time is you can
only
see the first number, the rest is cut off. Still don't won't to pay to
have
it repaired. We can buy a new TV for $300.00. It won't be a large
screen,
but with our recent experience with this RCA, we do not care to ever
purchase another big screen tv. Thanks to everyone for trying to help.
Marsha
"BobC" <lindabob2@worldnet.att.net> wrote in message
newsMi7b.134797$3o3.9568667@bgtnsc05-news.ops.worldnet.att.net...
I should have addressed a possible pincushion problem. You did not
mention were the curves were. If the picture is hour-glass shaped
(sides are bowed in) but the colors seemed ok; then you are talking
about a pincushion problem. In which case the cost of repair is
probably less.

If one or more of the colors are apparently misaligned with each other
then the problem is in the convergence amps or their power supply. In
this case, the bowing could be either or both in the horizontal or
vertical. The key is that the colors would be obviously messed up.

Marsha wrote:

Our RCA Big Screen Projection TV messed up right when the warranty
ended!
The picture looks curved now, you can still watch it. At first the
good
screen would try to come in & the curved screen would try to come
in,
&
one
morning while watching we heard a lot of noise & now it is just the
curved
screen. Anyone know what went out & about how much to fix?
Thanks,
Marsha

 

[Leonard Caillouet]

There was a lot of crap in 1984. I'd have a lot of newer sets over most of
the stuff made then.

Leonard Caillouet

"RJ" <joanrex@sbcglobal.net> wrote in message
news:dfu7b.756$B_.682@newssvr24.news.prodigy.com...

You are right...in 1984 almost all sets were built well. But they are just
like VCR's...a $49.95 VCR will not last very long and there are very few
shops that will work on the "low-end" crap. I have a VCR made in 1986...it
is VHS/SVHS has HiFI heads and still works very well. Its initial cost was
$634.00. After ALL these years I WIN-----Wal Mart loses. I have NEVER
under
stood this fact: Home electronics is the ONLY consumer product (including
Homes and Automobiles) that the price has gone down over the last 20
years.
Guess why? The QUALITY is gone in most cases. These broke, in debt,
overpaid
yuppie wantabes that make up MOST of the consumer market can't afford
QUALITY in MOST cases.

R

 

[Joe Brower]

Thanks for the advice, folks. I will forego trying to fix this myself and
start looking for someone who appears to know what they're doing to fix
this.

In the meantime, I'm going to just buy another Hi-8 camera and use this old
one as a backup.

Cheers, and thanks again,

Joe B.

 

[Ivanhoismine]

I've seen this problem resolved with a good head cleaning but if that doesn't
work, you may need a new amplifier chip. Did the color anomalies develop
suddenly or over time? If the former is the case, you're probably in for an
expensive/time consuming repair

 

[Semi Head]

From: maxg70@cwnet.com (max)

Hi

I'm looking for datasheet for TDA4486
Thank you

I could not find a datasheet for it..sorry.

Perhaps you can receive some (datasheet) help from this Company which
has the TDA4486 IC (in stock) for sell.

Donberg Electronics
http://www.donberg.ie/warehs/groupsy.htm

http://www.donberg.ie/descript/t/tda4486.htm