Toshiba TV29C90 problem; Image fades to black...

[bigmike]

"R. Steve Walz" <rstevew@armory.com> wrote in message
news:3F206CFF.6D7C@armory.com...

Kevin Aylward wrote:

bigmike wrote:
"Roger Johansson" <no-email@home.se> wrote in message
news:mh6vhvs8eejvrsto656getvopsj3u4skkd@4ax.com...



Like I said before, I am not a religious person, but science has
spread it's own fair amount of confusion over the years trying to
answer these same questions. However, the questions remain unanswered.

Nonsense. It is well answered and the answer is trivial. There is no
reason why we are here. Why on earth should there be a reason.

Any other answer gets you into the, its turtles all the way down.

Kevin Aylward
----------------
We're here for an adventure, of course.
-Steve

What adventure, exactly?

 

[James Sweet]

Board/CPU bundles are so inexpensive, I almost always recommend replacing
both
when either fails. (for example, starting at $59.95 from
www.tigerdirect.com )

Get a good board though, a flakey one will cause you nothing but grief.

 

[Franc Zabkar]

On Fri, 25 Jul 2003 08:24:11 -0000, Uns Lider
<unslider-usenet@miranda.org> put finger to keyboard and composed:

In article <e3633d6a.0307240940.71710b2a@posting.google.com>, Dr. Roberto VALENTE wrote:
I was able to recover the original video card pin layout and wanted to
attach a PC monitor to it. The problem is I have never seen this
layout before.
1 Composite Video
Video and sync mixed together.
2 GND
3 VID
Video only, no sync.
4 HRTC
Horizontal retrace.
5 VRTC
Vertical retrace.
6 Composite Video Ground
7 LPEN
Sensor input from light pen. Since there's no power supply on the connector,
this probably goes straight to the phototransistor.
8 LPEN GND
9 M.D. (no idea what this means!!!)
Trace it out?

Manual Degauss????


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.

 

[k_teppo]

What seems to be the problem with it? Often times the service manual's
price makes the repair project too expensive, and it's likely that the
problem can be fixed without the manual.

-k

"John M. Benz" <jmb-al@worldnet.att.net> wrote in message news:<3F1CC6A2.E85FB4F2@worldnet.att.net>...

Does anyone know where I might find service into on a Pioneer LD-700
laser disk player? Mine has died, and Pioneer says the service manual
is no longer available.

 

[k_teppo]

What seems to be the problem with it? Often times the service manual's
price makes the repair project too expensive, and it's likely that the
problem can be fixed without the manual.

-k

"John M. Benz" <jmb-al@worldnet.att.net> wrote in message news:<3F1CC6A2.E85FB4F2@worldnet.att.net>...

Does anyone know where I might find service into on a Pioneer LD-700
laser disk player? Mine has died, and Pioneer says the service manual
is no longer available.

 

[Jiri Kuukasjärvi]

Ricardo Matos Abreu wrote:

"Jiri Kuukasjärvi" <jiri.kuukasjarvi@pp.inet.fi> wrote in message
news:3F1E9E5A.93ACC091@pp.inet.fi...
Hi!

I just got this DVD-player.. That has originally been bought from
central europe.
So no service here in Finland.

The problem is following:
PSU board bad. Player tryes to spin disc, but fails. Lights dim.. I
measured
voltages on PSI board connectors, and most are ok. But some..

Does anyone have schematics for that PSU board?
There´s a text "Apex digital" on it, and it looks like this:
http://personal.inet.fi/koti/jirikk/Images/Project/HIT_PSU.jpg

- Jiri K.

I've no schematics, but seems like a pretty regular switching power supply
to me. If you understand how these babies work, it may be pretty
straightforward. Since some voltages are OK, the primary side is probably
fine. Look at the secondary side, especially those outputs that fail. Check
diodes and electrolytics. If you can't those caps, just replace them.
Lots of usefull info on
www.repairfaq.com
You can find a specific section for switchmode power supplies, and, most
important of all, SAFETY instructuions.
DO IT AT YOUR OWN RISK!

Ricardo

Ok, It´s almos working.
Most of the supplies are ok. Except for 12V (currently at 10.4V)
But what are these -F and +F supplies?

- Jiri K.

 

[Jerry G.]

Philips Instruments should be able to have this for you. You can call
Fluke if you cannot find where to call in Philips. Fluke is owned by
Philips. I found them to be very supportive for many of their old
models.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
==============================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
Instruments http://www.zoom-one.com/glgtech.htm
==============================================
"Tom @ HollyLodge" <Tom.HollyLodgeSPAM@dsl.pipex.SPAMcom> wrote in
message news:3f212544$0$11382$cc9e4d1f@news.dial.pipex.com...
Hi, I just bought a Phillips GM5605 Oscilloscope in a French "Yard
Sale",
for about 15 Euros (about $12), and the trigger circuit is a little bit
out,
and i was wondering if anybody has a user manual or repair field
manual/schematics in English, for this scope.

TIA

Tom O'C

 

[Don Lancaster]

Actually, the Gauss-Jordan reduction method replaced determinism decades
ago.
Full details on my website.

--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com fax 847-574-1462

Please visit my GURU's LAIR web site at http://www.tinaja.com

 

[Jerry Greenberg]

There are most likely some components failing in the scans and or the
power supply. If you are not trained and equiped to do TV servicing,
you will have to bring your set for an estimate in order to make an
intelligent decision about servicing it.

Jerry Greenberg
http://www.zoom-one.com

--


efandin@netscape.net (Efandin) wrote in message news:<73b23b5d.0307242113.7a457a15@posting.google.com>...

First who says my email address not valid? Without a valid email,
nobody can get this far.

My Panasonic TV (Model CT-32G21) has been turning off
ramdonly by itself. When it auto-turned off, I couldn't turned it on
until it turned on by itself (usually after 5-20 minutes). The Sleep
Timer and Program Timer are both off. I have tried by resetting the
TV by
pushing Power + Action buttons together. During the process - the
Message on TV screen was: Self Check T6F-4; Memory, PIP,
CRT, Tuner1, MTS are OK.
But the problem still persists. My TV was connected to 2 VCRs, DVD
player, and an old TV Scientific Atlanta cable box. Can somebody help
and advice please?

 

[t.hoehler]

I know static electricity is a danger but will the manget effect of
the
screwdriver stuff up my motherboard?

thanks in advance

Eyman

The quick and easy answer is no, no harm will come to the motherboard. Or to

the hard drive. Or to the floppy drive. Seriously, do be careful about
static, a wrist strap and good ground is a capital idea.
Regards,
Tom

 

[R. Steve Walz]

bigmike wrote:

"R. Steve Walz" <rstevew@armory.com> wrote in message
news:3F206CFF.6D7C@armory.com...
Kevin Aylward wrote:

bigmike wrote:
"Roger Johansson" <no-email@home.se> wrote in message
news:mh6vhvs8eejvrsto656getvopsj3u4skkd@4ax.com...



Like I said before, I am not a religious person, but science has
spread it's own fair amount of confusion over the years trying to
answer these same questions. However, the questions remain unanswered.

Nonsense. It is well answered and the answer is trivial. There is no
reason why we are here. Why on earth should there be a reason.

Any other answer gets you into the, its turtles all the way down.

Kevin Aylward
----------------
We're here for an adventure, of course.
-Steve

What adventure, exactly?
---------------------

All possible adventures, precisely, an infinite number.
-Steve
--
-Steve Walz rstevew@armory.com ftp://ftp.armory.com/pub/user/rstevew
Electronics Site!! 1000's of Files and Dirs!! With Schematics Galore!!
http://www.armory.com/~rstevew or http://www.armory.com/~rstevew/Public

 

[R. Steve Walz]

Don Lancaster wrote:

Actually, the Gauss-Jordan reduction method replaced determinism decades
ago.
Full details on my website.

--
Many thanks,

Don Lancaster
----------------

Hahahahahahahahahahah!!
-Steve
--
-Steve Walz rstevew@armory.com ftp://ftp.armory.com/pub/user/rstevew
Electronics Site!! 1000's of Files and Dirs!! With Schematics Galore!!
http://www.armory.com/~rstevew or http://www.armory.com/~rstevew/Public

 

[William R. Walsh]

Perfect! I printed a copy of that one!

William

 

[bigmike]

Yep, I like it. That's funny stuff :

"nipperchipper" <nipperchipper@hotmail.com> wrote in message
news:e7fe77c0.0307251903.1fb1f5df@posting.google.com...

NEW
Different color from previous design

ALL NEW
Parts not interchangeable with previous design

EXCLUSIVE
Imported product

UNMATCHED
Almost as good as the competition

DESIGNED SIMPLICITY
Manufacturer's cost cut to the bone

FOOLPROOF OPERATION
No provision for adjustments

ADVANCED DESIGN
Nobody understands it

FIELD-TESTED
Manufacturer lacks test equipment

HIGH ACCURACY
Unit on which all parts fit

DIRECT SALES ONLY
Factory had big argument with distributor

YEARS OF DEVELOPMENT
We finally got one that works

REVOLUTIONARY
It's different from our competitors

BREAKTHROUGH
We finally figured out a way to make it work

FUTURISTIC
No other reason why it looks the way it does

DISTINCTIVE
A different shape and color than the others

MAINTENANCE-FREE
Impossible to fix

RE-DESIGNED
Previous faults corrected, we hope...

HAND-CRAFTED
Assembly machines operated without gloves on

PERFORMANCE PROVEN
Will operate through the warranty period

MEETS ALL STANDARDS
Ours, not yours

ALL SOLID-STATE
Heavy as Hell!

BROADCAST QUALITY
Gives a picture and produces noise

HIGH RELIABILITY
We made it work long enough to ship it

SMPTE BUS COMPATABILE
When completed, will be shipped by Greyhound

NEW GENERATION
Old design failed, maybe this one will work

MIL-SPEC COMPONENTS
We got a good deal at a government auction

CUSTOMER SERVICE ACROSS THE COUNTRY
You can return it from most airports

UNPRECEDENTED PERFORMANCE
Nothing we ever had before worked THIS way

BUILT TO PRECISION TOLERANCES
We finally got it to fit together

SATISFACTION GUARANTEED
Manufacturer's, upon cashing your check

MICROPROCESSOR CONTROLLED
Does things we can't explain

 

[Jason Whorton]

Hi. I was just responding to the guy saying there was no way to check.
A POST card would be one way. I just start unplugging stuff myself.

Thank you,
Jason Whorton
A+ Certified Unplugger


"Jane Mirito" <user@inter.net> wrote in message
news:bfock2$q2b$1@reader10.wxs.nl...

You are right at some point.
But when there _isn't any life_ on the board to mention, then a
POST-card
wont help you any further in most cases.
Moreover a post-card plugs into the expansion-busses where you have an
extra
signal-driver-layer between the board/cpu/mem ...
And it's most of the times just an luxuary item, since ALL boards
provide
POST-signaling by ways of an LED, BEEPS, or display that run on the
CPU
directly.

If the board is death whatever causes the problem, you won't have any
advantages by using a post-card then.

Simply removing all expansions, and use your ears, or watch the leds.
If it's still death, check the power. Go check for some short-circuits
etc...
If it's still death, remount the CPU, check all IC's that sit in a
IC-socket.

But, you can always use advanced tools to go for.
Once I had a death mainboard where some unknow fluid sit under the
cristal-occilator, causing it not to provide any signal at all.
A scope helped me out then. But these are realy extreme rare cases (I
had
this once since i'm in that bussiness at the early beginning of the
PC)

Once I had an other strange fenomenon. There the bios EPROM was
corrupted.
(rare case too)
There a POST-card would helped me out.

But in productive point a view. Removing all the expansions, and
building up
one at a time until the problem comes back is the best and the fastest
option in my idea. no?

When it's realy death (all unplugged expansions) and the power is
fine, then
you check the IC's for good sitting.
If there is still no live to mention check the CPU in an other board.
If it stays death, replacing the mainboard is the most atractive
option and
commercial best too.
PC bussiness is all about doing things fast, or you won't gain any
money out
of it.

Just my 2 cents.



"Jason Whorton" <jason at microxl.com> wrote in message
news:vhv7rohbmo0f5b@corp.supernews.com...
Hello.



"Jane Mirito" <user@inter.net> wrote in message
news:bfmnjo$569$1@reader10.wxs.nl...
That's it man,
Plug and pray. There are no constructive ways to findout what is
wrong
when
a PC wont boot at all since the complexity of the separate (and
very
litle)
components is way to big.

You may want to do some research on a POTS card, or port 80 card.



Moreover you had the chance you know something about electronics
and
measured the powerwires.
Most PCtechnicians dont even know what a multi-meter is LOL

Way to go... good luck with your new treasure

Not everyone has heard of a POST card either. notLOL

Hope this helps,
JasonWho






"Doug Taylor" <techno2nospam@videotron.ca> wrote in message
news:slrnbht43i.ln.techno2nospam@localhost.localdomain...

Well here goes a run down of a typical PC repair experience
for me....

A friend gives me his old PC Pentium 100 Mhz as it's not
working.
As a challenge I decide to dig into to see whats wrong.

First, I set it up on the bench, remove the modem and sound card
and restart it with only video card to see if It will boot..
Blank
screen.
Then I sub out the video card and reboot... Blank screen.
Could be power supply, although seems to be getting power O.K.
to drives etc, check power plug motherboard with meter...O.K.
Sub out power supply anyways to be sure. ...blank screen.
Hummmmm whats next....
Sub out memory and re-seat.... no go.
Reseat CPU ..... nope............
Check out motherboard to make sure it is not shorted to bottom
metal
plate.(happened once before on another system)
What's next.... motherboard or CPU....
Go out and buy used Pentium 125Mhz motherboard with CPU.
Sub CPU.... no go ....
Sub motherboard & CPU ....BINGO ... we got a winner......

Have to cut bigger hole in case for PS2 mouse & keyboard of new
motherboard as old motherboard had COM port mouse and DIN
keyboard
plug.

Plan to put Linux on this system and use as a learning tool.

Question: Do you people have some constructive input into
the method I used to troubleshoot this system?

I'm kinda old(54) dyslexic & semi-retarded with bad eyesight,
but besides that I'm not a total idiot. 8*)

My conclusion is that the BIOS Rom failed.
What do you think?

Doug



--

=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
D E A D O N A R R I V A L
B B S

telnet://doabbs.dynip.com
http://www.dsuper.net/~techno

 

[Jason Whorton]

"Henry Mydlarz" <hemyd@optushome.com.au> wrote in message
news:3f1fa7e0$0$1212$afc38c87@news.optusnet.com.au...

My method for diagnosing boot problems is to disconnect or remove -
Diskette Drive, Hard Drive/s, Video Card, any other card/s, RAM
Dimm/s -
basically leave the motherboard and processor.
In that state the PC should make a sequence of beeps indicating the
lack of
RAM. The display is not necessary. If there is no life from the
motherboard,
it is either that, the processor or power supply. If there is a
sequence of
beeps where before there was no sign of life, I would then replace all
components one at a time, starting with the RAM, until the problem
recurs.

Hi. Since time is money, you may wish to unplug the one item that your
experience has taught you to be the most likely cause of that problem,
then see if it works. Keep pulling and re-testing until the problem is
found. Unecessarily pulling and re-inserting cards, CPU's and
ESPECIALLY RAM can possibly lead to other damage.

By the way, If there is no life from the system board with everything
removed I would also suspect the processor fan, as most of them use
dodgy
bearings that are prone to seizing up. If that has happened there is a
high
probability that the processor had cooked, in which case you could
either
find a compatible processor (probably second hand) or, as you did, use
it as
an excuse to upgrade to a better motherboard/processor combination.

Keeping the cheapest, slowest CPU of a CPU model family (Duron 600 for
example) is a good way to check.
If someone is paying a technician to repair it, an upgrade isn't too
cheap, and this doesn't take the person's data into account. Board
swaps usually go pretty well within the Windows 95 kernel OS's, but NT
isn't that simple, often requiring a complete re-install when a
different motherboard is used. Also, please note I didn't even touch on
the Windows XP little hardware code it creates and uses.

Hope this helps,
Jason Whorton

Henry

"Doug Taylor" <techno2nospam@videotron.ca> wrote in message
news:slrnbht43i.ln.techno2nospam@localhost.localdomain...

Well here goes a run down of a typical PC repair experience
for me....

A friend gives me his old PC Pentium 100 Mhz as it's not working.
As a challenge I decide to dig into to see whats wrong.

First, I set it up on the bench, remove the modem and sound card
and restart it with only video card to see if It will boot.. Blank
screen.
Then I sub out the video card and reboot... Blank screen.
Could be power supply, although seems to be getting power O.K.
to drives etc, check power plug motherboard with meter...O.K.
Sub out power supply anyways to be sure. ...blank screen.
Hummmmm whats next....
Sub out memory and re-seat.... no go.
Reseat CPU ..... nope............
Check out motherboard to make sure it is not shorted to bottom metal
plate.(happened once before on another system)
What's next.... motherboard or CPU....
Go out and buy used Pentium 125Mhz motherboard with CPU.
Sub CPU.... no go ....
Sub motherboard & CPU ....BINGO ... we got a winner......

Have to cut bigger hole in case for PS2 mouse & keyboard of new
motherboard as old motherboard had COM port mouse and DIN keyboard
plug.

Plan to put Linux on this system and use as a learning tool.

Question: Do you people have some constructive input into
the method I used to troubleshoot this system?

I'm kinda old(54) dyslexic & semi-retarded with bad eyesight,
but besides that I'm not a total idiot. 8*)

My conclusion is that the BIOS Rom failed.
What do you think?

Doug



--
=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
D E A D O N A R R I V A L
B B S

telnet://doabbs.dynip.com http://www.dsuper.net/~techno

 

[Jason Whorton]

"Alan Harriman" <vtech@usol.com> wrote in message
news:gikvhvom2invlfitmnedudr8jqoi2bfj11@4ax.com...

By the way, If there is no life from the system board with everything
removed I would also suspect the processor fan, as most of them use
dodgy
bearings that are prone to seizing up. If that has happened there is
a high
probability that the processor had cooked, in which case you could
either
find a compatible processor (probably second hand) or, as you did,
use it as
an excuse to upgrade to a better motherboard/processor combination.

Board/CPU bundles are so inexpensive, I almost always recommend
replacing both
when either fails. (for example, starting at $59.95 from
www.tigerdirect.com )

Alan Harriman

Hi. I guess everyone has his own definition of inexpensive. Just
replacing both blindly sounds like an unnecessary waste of money to me.
I shiver to think of the high quality combo from Juan in My-yama at
$59.95.

Thank you,
Jason Whorton

 

[Jörg Albert]

Hi Nigel,

jonesn@my-deja.com (Nigel Jones) wrote in message news:<b6dcdd63.0307091420.4a3e6b10@posting.google.com>...

...
I have also noticed on the last test shee that the "Status Page"
banner is repeated 1/3 down the page, in a pale fashion.

Only the centre 1/3 of the print is affected apart from a splodgy 1cm
line at far right.The text, both in the dirty area and white area is
still pin sharp.

I have quickly just tried to clean without touching anything with my
fingers or pressing hard. I have very carefully used the lint-free
cloth also on the drum, in dim light taking < 2 minutes. It was quite
dirty. The reverse of the paper isn't too bad.

It seems as if perhaps the corona wire - or equiv - is dirty -- where
exactly do I go in the printer/cartridge to check this. Certainly
something is allowing toner to stay on the drum I believe. What else
do I clean? Might anything be completely broken? The transfer roller?

Any progress on that problem? I got two defective PUs here,
one with a defect on the drum and a second which repeats the
image as you described above.
Both from an ebay auction, the second PU came as a replacement
for the first and the seller claims that it worked at his site
and send a status page which looked fine. He asked if I used
wrong toner.

I disassembled both PUs and put the second drum in the first PU -
no success. The ghost image followed.

Do you know how the drum is cleaned - I found no corona wire inside
and the techn. spec. says it does clean by a wiper. Maybe some
charging of the drum is needed too (to loosing the remaining
toner particles).

/Jörg

 

[N. Thornton]

Spehro Pefhany <speff@interlog.com> wrote in message news:<7v3ogvgtke82aj72dh4dk3n2ic95thdk4s@4ax.com>...

Unfortunately, the limited power available from North American outlets
cannot yield results comparable to the mighty kettles of Europe.

For example:
http://www.easibuy.com/shop/powerstore.cgi?product_id=135258&refer_id=kelkoo

3.1kW (!)

Hi.

Nearly all our kettles are 2.4 to 3.1 kW, but I never thought this was
enough. I always wanted to build a kettle with 2x 3kW elements, and
plug into 2 sockets at once. That would be better!

Only worry is what would happen when it actually boiled: probably be
so much steam force coming out the spout that it'd start rocketing
itself about the kitchen

You poor folks with 1.5 kW

Regards, NT

 

[John M. Benz]

k_teppo wrote:

What seems to be the problem with it? Often times the service manual's
price makes the repair project too expensive, and it's likely that the
problem can be fixed without the manual.

-k

"John M. Benz" <jmb-al@worldnet.att.net> wrote in message news:<3F1CC6A2.E85FB4F2@worldnet.att.net>...
Does anyone know where I might find service into on a Pioneer LD-700
laser disk player? Mine has died, and Pioneer says the service manual
is no longer available.

When a disk is inserted and play is activated, the disk spins and a front panel light (the standby light
as I recall) flashes for awhile, after which the disk just stops spinning. It seems to not be able to
read the disk. Any ideas? I've started checking electrolytics on the power supply board, which is
relatively easy to get to, but so far have turned up no bad ones. Other pc boards are on the bottom and
will require more effort to access, but I'll probably get around to checking caps on those also. Thanks
for any help.