Toshiba TV29C90 problem; Image fades to black...

Just like any other technical service, compare prices, check out the
experience of the "tech", especially on the particular product being
calibrated. Often an experienced tech who has more hands on knowledge of a
particular product can do a better job for less money. Often not.

An ISF certificate is no more a gaurantee of the best performance of a
television than a manufacturer's training certificate, CET, or any other
certification. It is jsut an indication that the tech might have some idea
what he is doing. You should discuss his experience and what you are
getting for your money in detail.

Leonard Caillouet

"ug" <gurdalumit@hotmail.com> wrote in message
news:vpdvmv4akn201a2kheqki91oji97lhtb9b@4ax.com...
> ok, but expensive
 
Thanks guys for the advice.I'm going to look into it further now. Lenny Stein.

"Al Savage" <asavage@iname.com> wrote in message news:<TPu4qbPdipCY-pn2-nNuDjxprZ2o9@tori>...
On Wed, 17 Sep 2003 04:39:49 UTC, captainvideo462002@yahoo.com (Lenny)
wrote:

It has no B+ to the Hor. output. I hear the
smps squeal when it turns on and the green power led lights so I feel
that the problem might be as simple as B+ distribution but I can't
trace it.

I don't recall that harness length made these particularly difficult to
work with.

I don't have any notes on the 732, but I used to get a fair number of
738s across the bench. Don't know if they're similar. For the 738:

* Bad solder on power connector P102 on PS board.

* Ck. D213, C241, Q216.

* HOT shorted, then replace:
C215 100uf 16v
C226 47uf 35v
C237 47uf 25v
Click to expand...
 
Warning; do NOT open that message.
Don't open the attachment!
It contains a virus attachment.

Al


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Hey, Al....get a life!

"Alain Beguin" <me2@privacy.net> wrote in message
news:mesnews.cb547d39.de2e181b.146.1714@privacy.net...
Warning; do NOT open that message.
Don't open the attachment!
It contains a virus attachment.

Al


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Click to expand...
 
Help!

I dont know what this code means?

Any help please?

Regards

Simon.
 
hello,
I'm looking for the Marantz 74P40/00B stéréo amplifier schematic
many thanks
 
<Wazo@that.bug.you.on.net.com> wrote in message
news:x9qdb.80984$PD3.4801255@nnrp1.uunet.ca...
To all webmaster,newsmaster

To fight Copyright and illegal usagers of Newsgroups
it's recommand to set all you News server to receive and send
only 32 kbytes of article for all newsgroups (250 lines)

Newsgrousp was use for Text , chit chat , permit to post more
of 32 kbytes of article it's flood internet all around the world
and groups team piracy have use usenet for long time

Fight Piracy set your News Server to 32 kbytes (250 lines)



Thanks

Fight Piracy Team !
Click to expand...

heh, anti-piracy SPAM...
 
In article <EsHdb.8161$gi2.1647@fed1read01>, Sal M. Onella wrote:
"Loren Coe" <loren@netnews.attbi.com> wrote in message
news:vYj8b.421842$YN5.284424@sccrnsc01...
i am a news nut these days, have the time and interest, and
am increasingly diddling with the volume of the tv channel
depending on the original source/type of audio.

snip
i am going to be doing a major
reconfiguration of my Bud, audio, FTA antenna and tv components
this fall/winter and would like suggestions/experience along
these lines. i have some advanced accessories now (like a
Sony modulator) and would be willing to spend some reasonable
amount to clean up sound, especially since i am planning to
add a "studio" to record/dub and copy video and audio sources.

compression/expansion is something that has been on my mind,
but for other reasons, so there seems to be at least two
features that i want to add. thanks! --Loren

One device for doing this is known as a "compander", short for
compressor-expander.

http://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=compander
returns about 9,000 possibilities.
Sorry if I'm stating the obvious, but FWIW:
Click to expand...
no, not obvious at all, a good reminder how just how much of this
i "used to know". <grin> there has been surprising little interest
in my post, i may try it again, any suggestion as to group/s? the
pro audio is moderated and doubtful of any devices like these.

Best Regards, and thanks, --Loren

(a) Expanding low-level audio may cause you to hear some hum and hiss that
were
inaudible before.(b) Compressing high level audio sometimes results in
distortion on
the first few milliseconds of each audio passage.
(c) If there's any contant background audio (crowd noise, nature sounds) in
a signal
that's being companded, the background varies, often annoyingly so, in a
phenomenon
called "pumping". Thus, you may need to limit the amount of companding.
(In my
experience, once you record something with pumping on it, you are stuck with
it.)

Good luck.

"Sal"
Click to expand...
 
Go to the website. It isn't hard to find.

--
--------------------

Alan "A.J." Franzman

Email: a.j.franzman at verizon dot net

--------------------


"Elec-Bibi" <no@email.com> wrote in message
<news:3uahnvoa0bb3e84dhcucfcmodnnurl1ss5@4ax.com>:
 
Hi;

Thanx for the replies.

There is no "noide" key or value or anything in the registry. There is a
disabled device in device mgr, PCI SSA. Now I am pretty sure I don't have this,
but the MB does have onbaord SCSI.

I guess I'll have to go through all the steps in the link for troubleshooting
from microsoft.

I did a web search and found out about SSA, but nothing was revealing as to why
my PC now thinks it has it. Lately it has been intermittently having trouble
initing the SCSI drives, and while I've found this to be power supply problems
in the past, I don't think that's it now, I got two power supplies in there and
I have switched the plugs around.

I am starting to consider pulling the mobo and replacing a shitload of
electrolytics, even though it's older it does run pretty well. Also, when I DO
build my new one, this will be an adequate backup. After I have a better
backup, this will become a kidz PC and I'll either sell it dirt cheap or give
it away. The only problem is that my current backup PC is not setup for the DSL
and I'm not sure I should bother. There have been times the backup PC saved my
(_|_) regarding emails related to business, like on eBay.

Thanx again, but now what's next ?

JURB
 
Let's file this one under "Urban Legend"....good for a laugh though!....I
guess we are to think the family of seven, the cat and a cop raced over to
the DVD player and stared at the laser till they were all blinded where they
all subsequently ran into walls and furniture till they were all knocked
silly!!!....hahahaha....Ok....Ok...enough...later, Ross
"gothika" <gothika@earthlink.net> wrote in message
news:s15gmvsqmo12rse4iqmr4041l1rdeor5cp@4ax.com...
On Tue, 05 Aug 2003 07:24:11 -0500, physics-teacher@rooseveltHS.edu
wrote:

On Tue, 05 Aug 2003 11:27:08 GMT, Impmon <Impmon@tds.net> wrote:

On Mon, 04 Aug 2003 13:12:13 -0500, americanfamilyagent207@livewire.com
typed:

player became cracked during the fall to the floor, emitting the fatal
radiation which killed the entire family of seven.
[snip]

I'm having a hard time with that. Granted the laser inside the DVD
player is harmful but unless you looked directly at the laster, you
won't be harmed by a cracked case. I've had the case off of my DVD
player for a few days when I was trying to get the spindle working and
I'm doing fine.

There is no way the radiation from the player can killthe whole family.

Being a physics teacher, let me explain something.

A laser can go through the smallest hole, and if the disk is rotating
inside, the laser beams can be reflected at millions of different
angles, and many thousand times per second. Thus the laser beams
could spew out of that crack like bullets coming out of a machine gun.
Anyone in the path of these beams are instantly history. So, yes it
can kill a whole family and even a whole stadium full of people in
seconds. Lasers are dangerous and if one gets out of control, like
apparently this one did, there is no telling who or what will be
killed or destroyed.

What a load of crap!
I've worked with military grade lasers, ones that CAN really kill you.
There is no way the laser in a dvd player can emit enough energy to
kill anyone directly.
And as far as the radiation goes you'd have to practically stick it in
your eye to get enough to do any harm.
We have this thing called the Underwriters Labaratory that tests all
household appliances.
I doubt that they'd approve any houshold device that could emit even a
near lethal dose of rads without adequate shileding.
You're more likely to get cancer from your microwave.
Click to expand...
 
Yeah, I like it....Lets send all donations for a Carribean vacation to: "All
in this thread" (accept the originator)....
We can all wait at some bank in the Caymens for the bucks to poor in. Well
hey, it works for that idiot preacher on TV who asks for "A thousand dollar
vow of faith"...heck if you believe this one you might as well send the
gran.....still laughing....later, Ross
"Max Volume" <macsvolume@yahoo.com> wrote in message
news:180920031940069115%macsvolume@yahoo.com...
In article <TsydnbZPOff5KfSiRVn-hw@giganews.com>, Jeeters
noham@nospam.com> wrote:

This thread died and was buried over month ago. Get in the time
machine!

I am accepting donations on behalf of the family of this thread. This
is not a scam whereby I take all the donations and jet off to Rio, this
is real. Please send all donations to:

"Killer DVD Player" Thread Memorial Fund
Behind The Hot Water Pipes
Third Washroom Along
Victoria Station
Click to expand...
 
It sounds as believable as cell phones blinding cats and blowing up gas
stations. I guess that even "physics teacher" can be idiots.

"Ross Mac" <macroeng@example.invalid> wrote in message
news:3bHfb.169394$3o3.12336249@bgtnsc05-news.ops.worldnet.att.net...
Let's file this one under "Urban Legend"....good for a laugh though!....I
guess we are to think the family of seven, the cat and a cop raced over to
the DVD player and stared at the laser till they were all blinded where
they
all subsequently ran into walls and furniture till they were all knocked
silly!!!....hahahaha....Ok....Ok...enough...later, Ross
On Tue, 05 Aug 2003 07:24:11 -0500, physics-teacher@rooseveltHS.edu
wrote:
player became cracked during the fall to the floor, emitting the
fatal
radiation which killed the entire family of seven.
[snip]
I'm having a hard time with that. Granted the laser inside the DVD
player is harmful but unless you looked directly at the laster, you
won't be harmed by a cracked case. I've had the case off of my DVD
player for a few days when I was trying to get the spindle working and
I'm doing fine.
There is no way the radiation from the player can killthe whole
family.

Being a physics teacher, let me explain something.

A laser can go through the smallest hole, and if the disk is rotating
inside, the laser beams can be reflected at millions of different
angles, and many thousand times per second. Thus the laser beams
could spew out of that crack like bullets coming out of a machine gun.
Anyone in the path of these beams are instantly history. So, yes it
can kill a whole family and even a whole stadium full of people in
seconds. Lasers are dangerous and if one gets out of control, like
apparently this one did, there is no telling who or what will be
killed or destroyed.

What a load of crap!
I've worked with military grade lasers, ones that CAN really kill you.
There is no way the laser in a dvd player can emit enough energy to
kill anyone directly.
And as far as the radiation goes you'd have to practically stick it in
your eye to get enough to do any harm.
We have this thing called the Underwriters Labaratory that tests all
household appliances.
I doubt that they'd approve any houshold device that could emit even a
near lethal dose of rads without adequate shileding.
You're more likely to get cancer from your microwave.
Click to expand...
 
Hey, maybe this so called Physics teacher thinks the DVD emits microwave
energy....but I guess then the cat would have been BBQ'd....I know that was
sick....later, Ross
"Gary" <garywilliamson@comcast.net> wrote in message
news:4KWdnQFAtLJ33OKiXTWJkw@comcast.com...
It sounds as believable as cell phones blinding cats and blowing up gas
stations. I guess that even "physics teacher" can be idiots.

"Ross Mac" <macroeng@example.invalid> wrote in message
news:3bHfb.169394$3o3.12336249@bgtnsc05-news.ops.worldnet.att.net...
Let's file this one under "Urban Legend"....good for a laugh
though!....I
guess we are to think the family of seven, the cat and a cop raced over
to
the DVD player and stared at the laser till they were all blinded where
they
all subsequently ran into walls and furniture till they were all knocked
silly!!!....hahahaha....Ok....Ok...enough...later, Ross
On Tue, 05 Aug 2003 07:24:11 -0500, physics-teacher@rooseveltHS.edu
wrote:
player became cracked during the fall to the floor, emitting the
fatal
radiation which killed the entire family of seven.
[snip]
I'm having a hard time with that. Granted the laser inside the DVD
player is harmful but unless you looked directly at the laster, you
won't be harmed by a cracked case. I've had the case off of my DVD
player for a few days when I was trying to get the spindle working
and
I'm doing fine.
There is no way the radiation from the player can killthe whole
family.

Being a physics teacher, let me explain something.

A laser can go through the smallest hole, and if the disk is rotating
inside, the laser beams can be reflected at millions of different
angles, and many thousand times per second. Thus the laser beams
could spew out of that crack like bullets coming out of a machine
gun.
Anyone in the path of these beams are instantly history. So, yes it
can kill a whole family and even a whole stadium full of people in
seconds. Lasers are dangerous and if one gets out of control, like
apparently this one did, there is no telling who or what will be
killed or destroyed.

What a load of crap!
I've worked with military grade lasers, ones that CAN really kill you.
There is no way the laser in a dvd player can emit enough energy to
kill anyone directly.
And as far as the radiation goes you'd have to practically stick it in
your eye to get enough to do any harm.
We have this thing called the Underwriters Labaratory that tests all
household appliances.
I doubt that they'd approve any houshold device that could emit even a
near lethal dose of rads without adequate shileding.
You're more likely to get cancer from your microwave.
Click to expand...
 
Technical Note
W. Curtiss Priest
BMSLIB@MIT.EDU
October 6, 2003
Subject: Switching Power Supply Failure
Device: Panasonic PV-1560 VCR
Keywords: Fuse blows with bright light
Switching transistors
Problem, VCR completely dead
Repair a switching power supply

Preface:

While this repair story is about a fifteen year old
VCR, the proceedure is one to follow for everything
from PC power supplies to Audio CD to DVD players.

The front ends of switching supplies are quite simple.

We "make" 180 VDC from the AC line by using a "full-wave"
rectifier (i.e. 4 diodes, usually in a single package)
and storing that in a husky capacitor (around 300 ufd.,
200 volts). We tuck one or two MOV devices to suppress
transients, a fuse to meet UL requirements for fire
safety, and then one or two transistors in an oscillator
circuit to chop the DC and apply it to a small transformer
next to the transistor(s).

Introduction:

Typical reasons why a VCR (or most anything else) is dead:

1. Humidity sensor shuts down power supply
2. Switching supply transformer shorts
3. Switching transistor shorts
4. Bridge rectifier shorts

In that the fuse (1.6 amp) goes with a bright light, the problem
would not be #1.

An ohm meter check of the rectifiers indicated
semiconductor action -- i.e. -- leads one way (one
polarity via ohm meter battery) indicates a different
resistance than the other. Always use an earlier,
analog (meter) ohm meter -- not a digital one -- to
get enough voltage across the diode to conduct (i.e.
above .6 volts) Use range x1

Rectifers were fine, so not #4.

Checking again with an ohm meter, Base to Collector and
Base to Emitter indicated that the switching transistor
(only one in this design) was fused. So the switching
transformer appeared as a dead short, and thus the
bright light.

Now. Is the switching transformer ok? Or, did it fail,
and take out the transistor?

To distinguish this is the reason one has a small collection
of switching power supplies from various devices.

We check the NTE equivalent of the C3890 transistor (really
2SC3890 -- the first two characters are almost always
dropped). Cross is an NTE 379 -- 12 amp T-NPN Silicon,
Power Amp., high voltage switch -- 700 volts.

While we are only switching rectified line voltage, i.e.,
about 180 VDC, transients around an inductor dictate the
much higher transistor voltage. And, while VCRs tend to
run at 10-15 watts ("off" versus play) and so currents
on the high voltage side of the supply are quite low
(note the 1.6 amp fuse -- which is way over 15/180 amps --
having a 12 amp switcher also deals with transients.

Grabbing a power supply, it had a pair of C4242 (2SC4242)
switching transistors on a largish aluminum heat sink.

Crossing that, these are NTE 2312, same category transistor,
700 volts, 8 amps. Same TO220 case, same pattern of
base, collector, emitter leads.

***

The original transistor had absolutely no heat sink. This
is highly unusual and probably the reason it was susceptible
to shorting.

So, with a hack saw, I cut the C4242 from the heat sink,
leaving enough heat sink to "look right" (and fit). I
use a steel cutter in a rotary tool to shape the cut
edge, removing sharp edges and smoothing the cut surface.

I've cut the C3890 out, leaving 1/4 inch of leads coming
up from the circuit board. (I used to diligently unsolder
the leads from the board and solder suck the holes clear,
but overlapping pre-tinned leads is faster.)

So, with the new transistor in, we will now determine
if there is a #2 fault (for a similar kind of fault
in a CRT monitor/TV, there is an LOPT/FBT tester to
examine whether the high voltage winding is shorted
on the flyback transformer).

A third fuse (uum, running low on 2 amp fuses), the
"new" transistor soldered in, we plug the machine in
again -- wincing.

Ah! No bright white light. (Front panel is off, to access
the power supply -- but we hear a few motors start and
stop -- "good sounds."

Reinstalling the power supply (too many screws and steel
twist tabs -- plus -- multi-pin connector to the front
panel, we plug it in -- the machine blinks 12:00. Put
in a tape, hit play -- says it is -- this is proof enough
for me, finish by replacing the top cover.
 
"W. Curtiss Priest" bravely wrote to "All" (06 Oct 03 14:43:59)
--- on the heady topic of "re: Switching Power Supply Failure"

WCP> From: "W. Curtiss Priest" <bmslib@mit.edu>

WCP> Technical Note
WCP> W. Curtiss Priest
WCP> BMSLIB@MIT.EDU
WCP> October 6, 2003
WCP> Subject: Switching Power Supply Failure
[,,,]
WCP> Repair a switching power supply

WCP> Preface:

WCP> While this repair story is about a fifteen year old
WCP> VCR, the proceedure is one to follow for everything
WCP> from PC power supplies to Audio CD to DVD players.

What a nice happy ending! While this is not supposed to be a Pekinpah
movie script, it didn't have our hero riding off into the sunset. :-(
Only on the usenet! :)

Thanks!

Asimov
******

.... Over a hundred billion electrons were used in crafting this tagline.
 
Asimov wrote:

"W. Curtiss Priest" bravely wrote to "All" (06 Oct 03 14:43:59)
--- on the heady topic of "re: Switching Power Supply Failure"

WCP> From: "W. Curtiss Priest" <bmslib@mit.edu

WCP> Technical Note
WCP> W. Curtiss Priest
WCP> BMSLIB@MIT.EDU
WCP> October 6, 2003
WCP> Subject: Switching Power Supply Failure
[,,,]
WCP> Repair a switching power supply

WCP> Preface:

WCP> While this repair story is about a fifteen year old
WCP> VCR, the proceedure is one to follow for everything
WCP> from PC power supplies to Audio CD to DVD players.

What a nice happy ending! While this is not supposed to be a Pekinpah
movie script, it didn't have our hero riding off into the sunset. :-(
Only on the usenet! :)

Thanks!

Asimov
******

... Over a hundred billion electrons were used in crafting this tagline.
Click to expand...
Only trouble is, it doesn't always work out that way. We had one, similar
setup, mimimal heatsinking, etc. and a blown fuse and shorted transistor.
Replacing the fuse and transistor resulted in both blowing again. I then
heard about an outfit ("Studio Somthingorother", ask me if you want me to
look it up) that offered a "rebuild kit" for this and a lot of other models
of VCRs. For less than $20 delivered, I got this kit that contained new
caps, diodes, resistors, and a bunch of other parts. It was rather tedious
to go through replacing all of that, but I'm glad I did as that VCR worked
right off when I plugged it in and is still working fine, 5+ years later.
 
Hi.
I got some help from Jeff Stielau (thank you) about 7 months ago to repair
the horizontal now it seems to be a vertical problem.

I started to loose the top part of the picture with the horizontal lines
folded over, then the vertical quit and I had a horizontal line for a moment
before the set died.
I think that the power supply has sensed an over current condition and shut
down?
Has anyone seen this before and could possibly suggest where to look in the
vertical section.
Thanks in advance for your help.





-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
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Hi all,

I am in the UK (but would buy from anywhere) and trying to get hold of a
Sanyo STK51427A to repair a PSU in a much loved old Goldstar 8mm/VHS edit
VCR.

This hybrid was in still use in 1994/1995, it is obsolete now and can not
get a data sheet off the Sanyo semicon website even. Found two with a big US
chip supply company but there min. order value is $500 !!!.

Any ideas where to get one from, thank you for any assistance you can offer.

--
Regards
Marcus
 
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