Toshiba TV29C90 problem; Image fades to black...

Thank you for the advise. Replaced three of the non-polarized
capacitors in the area of the IC and the TV is working fine now.

All tha capacitors in the set are made by Marcon which are difficult
to cross reference (United Chemi-Con is the parent company). Most of
the caps in the set are the low-ESR type for the power and the others
are the non-polarised type for signal coupling I guess. So I targetted
the signal caps....

Thank again.

On Sun, 10 Jul 2005 00:28:01 -0500, "Dave Moore"
<novalves@NOT-EDbellsouth.net> wrote:

FWIW, I've seen the legendary ' bad toshiba vertical caps'
be either green or brown also


"Rono" <rono@nl.rogers.com> wrote in message news:FKednUcHKcCJh1LfRVn-1Q@rogers.com...
: Check, & replace capacitors near the IC,
: also replace any red caps by the jungle IC,
: & vertical IC. Rono.
:
:

 

[Donald]

Try Fox International, 800-231-9786

"Dave Platt" <dplatt@radagast.org> wrote in message
news:11crcqdag3qsv2c@corp.supernews.com...

In article <1120772869.087680.134120@f14g2000cwb.googlegroups.com>,
Tim Shoppa <shoppa@trailing-edge.com> wrote:

Can anyone recommend a distributor for short lengths of Teflon
insulating tubing? (As in for 18, 22, etc. gauge wire). Mouser lists
it but min order is 1000 feet... I only need a foot or two of each
size. Tim.

http://www.amidoncorp.com/ lists a few sizes (for 12, 13, 14,16, 18
gauge bare wire) by-the-foot, in their "Ham pricing" section. Look
under "Tapes and wires".

You might find it easier to locate solid or stranded wire which is
pre-insulated with Teflon.

--
Dave Platt <dplatt@radagast.org> AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

 

[Donald]

Download this website, it's for crossing electronic components.
www.nteinc.com
Hope this works for you.

"MarkC" <markcharles@webtv.net> wrote in message
news:12092-42CEE0FF-431@storefull-3257.bay.webtv.net...

Is there any data on the net where I can compare the specs on these?
Thanks

 

[Donald]

Change vertical capacitors, that will fix it.

<mkante@telus.net> wrote in message
news:hu5uc11av3fgsn89glhlhmi28r8dn34rl0@4ax.com...

Greetings,
The top 1/6th of the picture seems to have run over the top and
flipped back over again. The remainder of the picture appears perfect.

I have already replaced the vertical control amplifier IC but no
change. $4 chip so no biggie.

Any other recommendations?

 

[none]

On Tue, 16 Aug 2005 21:50:16 -0400, "Donald" <wizard797@ohiohills.com>
wrote:

Try Fox International, 800-231-9786

"Dave Platt" <dplatt@radagast.org> wrote in message
news:11crcqdag3qsv2c@corp.supernews.com...
In article <1120772869.087680.134120@f14g2000cwb.googlegroups.com>,
Tim Shoppa <shoppa@trailing-edge.com> wrote:

Can anyone recommend a distributor for short lengths of Teflon
insulating tubing? (As in for 18, 22, etc. gauge wire). Mouser lists
it but min order is 1000 feet... I only need a foot or two of each
size. Tim.

http://www.amidoncorp.com/ lists a few sizes (for 12, 13, 14,16, 18
gauge bare wire) by-the-foot, in their "Ham pricing" section. Look
under "Tapes and wires".

You might find it easier to locate solid or stranded wire which is
pre-insulated with Teflon.

--
Dave Platt <dplatt@radagast.org> AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

I've had luck using silicone tubing as a high temp insulator in the

past.
Get it from old sections of spark plug wiring. Just pull out the
core(carbon conductor with nylon weave jacketing.) with a pair of
needle nose pliers.(For cores that are sticky spray a bit of silicone
lubricant in between the silicone sleeve and the nylon jacketing.)
Advantage is it's a good high temp insulator and can be gotten on the
cheap.
If you've got to have the teflon try a local plastics supply house in
your area, or a plastics fabricator shop. They'll have odd bits that
you could get cheaply.

 

[Leonard Caillouet]

NTE will not give you this info. It will give you a cross for the basic
2sc4834 only, which I would not use.

The difference is the gain. Higher letters have higher gain ranges. Do a
google search for previous posts here. These parts and the Sony circuits
they are found in are discussed ad nauseum.

Leonard

"Donald" <wizard797@ohiohills.com> wrote in message
news:1XwMe.6639$Mi3.21316752@news.sisna.com...

Download this website, it's for crossing electronic components.
www.nteinc.com
Hope this works for you.

"MarkC" <markcharles@webtv.net> wrote in message
news:12092-42CEE0FF-431@storefull-3257.bay.webtv.net...
Is there any data on the net where I can compare the specs on these?
Thanks

 

[larry moe 'n curly]

Tom Biasi wrote:

"larry moe 'n curly" <larrymoencurly@my-deja.com> wrote in message
news:1124309194.645037.10190@g14g2000cwa.googlegroups.com...

I have an Asrock (budget Asus) K7VT4A Pro ATX motherboard with three
empty spaces where it seems that fuses would normally go.

Mobos often have empty spaces where it looks like something could go. Not
every model uses every space.
RTFM: http://www.asrock.com.tw/Drivers/Manual/K7VT4APro_um.pdf

I have RTFM, but TFM doesn't mention the fuse, and I doubt that these
missing fuses are for any missing functions.

If they are not there you probably don't need them.

Yes, but why specifically is the circuit board laid out for those
fuses?

 

[kony]

On 18 Aug 2005 02:04:00 -0700, "larry moe 'n curly"
<larrymoencurly@my-deja.com> wrote:

Tom Biasi wrote:
"larry moe 'n curly" <larrymoencurly@my-deja.com> wrote in message
news:1124309194.645037.10190@g14g2000cwa.googlegroups.com...

I have an Asrock (budget Asus) K7VT4A Pro ATX motherboard with three
empty spaces where it seems that fuses would normally go.

Mobos often have empty spaces where it looks like something could go. Not
every model uses every space.
RTFM: http://www.asrock.com.tw/Drivers/Manual/K7VT4APro_um.pdf

I have RTFM, but TFM doesn't mention the fuse, and I doubt that these
missing fuses are for any missing functions.

If they are not there you probably don't need them.

Yes, but why specifically is the circuit board laid out for those
fuses?

It's easier to make one board design that's a jack of all
trades, then later modify it only the (least) amount
necessary to meet some requirement or cut cost or (whatever
the scenario). Did you determine how the (typically fused)
ports are getting power since those fuse positions are
unfilled?

 

[Michael Black]

"larry moe 'n curly" (larrymoencurly@my-deja.com) writes:

Tom Biasi wrote:
"larry moe 'n curly" <larrymoencurly@my-deja.com> wrote in message
news:1124309194.645037.10190@g14g2000cwa.googlegroups.com...

I have an Asrock (budget Asus) K7VT4A Pro ATX motherboard with three
empty spaces where it seems that fuses would normally go.

Mobos often have empty spaces where it looks like something could go. Not
every model uses every space.
RTFM: http://www.asrock.com.tw/Drivers/Manual/K7VT4APro_um.pdf

I have RTFM, but TFM doesn't mention the fuse, and I doubt that these
missing fuses are for any missing functions.

If they are not there you probably don't need them.

Yes, but why specifically is the circuit board laid out for those
fuses?

Because it's cheaper to make one board, and then stuff it as needed,

than have to make a different board for every variant, or when a small
change is necessary.

Let's say they make 100,000 boards. They start stuffing and run out
of a specific part at the 10,000 mark. If they can't get the part that
fits, then they have to scrap the remaining 90,000 boards. But when
they have foresight, they have designed the board to take some different
parts sizes just in case.

Or, and this is common in consumer equipment, one board has some features
that the other doesn't. So long as it doesn't add too much to the board
space, it's cheaper to have one board that has all the possibilities than
multiple boards.

So the fuses that are "missing" may exist on the board in a different
form. Or they may be part of feature that isn't part of what you bought,
so you don't get it.

Meanwhile, someone else might have the same board, and have those
fuses in place while fuses in a different package elsewhere are "missing".
The traces on the board simply put both in parallel so what is available
can fit the board. Or, they have some extra feature that requires some
of the "missing" parts, so the space is filled.

Michael

 

[Conor]

In article <1124355840.478272.157770@g44g2000cwa.googlegroups.com>,
larry moe 'n curly says...

Yes, but why specifically is the circuit board laid out for those
fuses?

Fuck sake...you really have no idea do you?

It is far cheaper for manufacturers to design and stock one PCB to work
across many models than to design and make a PCB for each individual
model.


--
Conor

If Pac-Man affected us as kids, we'd all be running around in darkened
rooms, munching magic pills and listening to repetitive electronic
music.

 

[larry moe 'n curly]

Conor wrote:

In article <1124355840.478272.157770@g44g2000cwa.googlegroups.com>,
larry moe 'n curly says...

Yes, but why specifically is the circuit board laid out for those
fuses?

Fuck sake...you really have no idea do you?

It is far cheaper for manufacturers to design and stock one PCB to work
across many models than to design and make a PCB for each individual
model.

I realize that, but in this case I can't imagine why the manufacture
would vary the design because the fuses are for keyboard (and maybe
mouse), USB, and Ethernet, and this particular mobo doesn't seem to
have any missing features for these because it does allow wake on
keyboard/mouse/USB/Ethernet.

 

[Conor]

In article <1124391797.339580.15430@g49g2000cwa.googlegroups.com>,
larry moe 'n curly says...

I realize that, but in this case I can't imagine why the manufacture
would vary the design because the fuses are for keyboard (and maybe
mouse), USB, and Ethernet, and this particular mobo doesn't seem to
have any missing features for these because it does allow wake on
keyboard/mouse/USB/Ethernet.

For that particular model.

--
Conor

If Pac-Man affected us as kids, we'd all be running around in darkened
rooms, munching magic pills and listening to repetitive electronic
music.

 

[kony]

On Thu, 18 Aug 2005 21:01:03 +0100, Conor
<conor.turton@gmail.com> wrote:

In article <1124391797.339580.15430@g49g2000cwa.googlegroups.com>,
larry moe 'n curly says...

I realize that, but in this case I can't imagine why the manufacture
would vary the design because the fuses are for keyboard (and maybe
mouse), USB, and Ethernet, and this particular mobo doesn't seem to
have any missing features for these because it does allow wake on
keyboard/mouse/USB/Ethernet.

For that particular model.

Yes, BUT for that particular model the fuses ARE missing.
Our presumptions about why they might have the fuse spots
still doesn't address his original query.

 

[Ken Weitzel]

kony wrote:

On Thu, 18 Aug 2005 21:01:03 +0100, Conor
conor.turton@gmail.com> wrote:


In article <1124391797.339580.15430@g49g2000cwa.googlegroups.com>,
larry moe 'n curly says...


I realize that, but in this case I can't imagine why the manufacture
would vary the design because the fuses are for keyboard (and maybe
mouse), USB, and Ethernet, and this particular mobo doesn't seem to
have any missing features for these because it does allow wake on
keyboard/mouse/USB/Ethernet.


For that particular model.



Yes, BUT for that particular model the fuses ARE missing.
Our presumptions about why they might have the fuse spots
still doesn't address his original query.

Hi...

Just thinking out loud... not only different models, but
that one board design will have been designed for use in
different parts of the world.

Perhaps outher countries have different code requirements for
things "extended from" the main chassis?

Wouldn't explain a missing fuse all by itself, but perhaps
one jumper is eliminated elsewhere and then the fuse is
required...

Just a thought.

Ken

 

[jestoppinby]

Jurb--my Sony 4110 TV works fine, but the picture is quite faded. Would
the cleaning/coolant help the picture quality? If so, what do you
charge?

Thanks.
JURB6006 Wrote:

How's the coolant on that set ? I got some specific instructions on
that
procedure if you're interested. Difficult procedure but worth it, these
thing
usually have strong tubes and the cooling system is quite effective,
which
means the phospor is good and efficient.

I could do them for you but it'll cost a bit.

JURB

--
jestoppinby

 

[kony]

On Fri, 19 Aug 2005 03:21:06 GMT, Ken Weitzel
<kweitzel@shaw.ca> wrote:

Yes, BUT for that particular model the fuses ARE missing.
Our presumptions about why they might have the fuse spots
still doesn't address his original query.

Hi...

Just thinking out loud... not only different models, but
that one board design will have been designed for use in
different parts of the world.

Perhaps outher countries have different code requirements for
things "extended from" the main chassis?

Wouldn't explain a missing fuse all by itself, but perhaps
one jumper is eliminated elsewhere and then the fuse is
required...

Just a thought.

Ken

It's an interesting thought but the remaining question is
still, if the fuse isn't installed _and_ the fuse location
isn't jumpered, why and where did they reroute the power for
the ports? "Usually" when a fuse is (or isn't) used, the
power is still delivered on same traces either way, the
circuit change is prior to that point.

 

[larry moe 'n curly]

Ken Weitzel wrote:

Just thinking out loud... not only different models, but
that one board design will have been designed for use in
different parts of the world.

Perhaps outher countries have different code requirements for
things "extended from" the main chassis?

Wouldn't explain a missing fuse all by itself, but perhaps
one jumper is eliminated elsewhere and then the fuse is
required...

That makes sense.

This is the first time I've seen a mobo made for fuses where the
left-out fuses weren't substituted with jumper wires (PC Chips, some
ECS) or copper traces between each fuse location's solder pads.

 

[Curly Howard]

"larry moe 'n curly" <larrymoencurly@my-deja.com> wrote in
news:1124432882.979924.40630@g47g2000cwa.googlegroups.com:

Ken Weitzel wrote:
Just thinking out loud... not only different models, but
that one board design will have been designed for use in
different parts of the world.
....

That makes sense.

This is the first time I've seen a mobo made for fuses where the
left-out fuses weren't substituted with jumper wires (PC Chips, some
ECS) or copper traces between each fuse location's solder pads.

I can't tell you why, or how. But a suggestion might help.

I've been doing PC Repair for a long time. And I've often seen the same
mobo design used by different manufacturers. And in the same
manufacturer, I've seen boards that are the same layout, but different in
the number of components, the one with less components on the board being
the cheaper version.

What I would try to do is find other boards on the manufacturers website
with the same layout. Often they include a picture of the board (not
always the best rez) that might show you what you're looking for.

I've often seen boards that are the same layout from Chaintech, PC Chips,
Asus, Epox and others. It's a pain in the tukas, but you might also be
able to find a board with the same layout but different features with one
of these other vendors.

The boards will always be the same size physically, and have the same
locations of the CPU socket and primary chipset(s). But they may have a
different number of bus interfaces, or memory sockets. And often they
have different bioses. However, I have (in the past) been able to use
one vendor's drivers to make a piece of hardware work.

Hope that helps lmac.

Curly

yak, yak, yak, oooooohh....

 

[Conor]

In article <gcjag1trj0quc7hec5ravaic28911mnc8n@4ax.com>, kony says...

On Thu, 18 Aug 2005 21:01:03 +0100, Conor
conor.turton@gmail.com> wrote:

In article <1124391797.339580.15430@g49g2000cwa.googlegroups.com>,
larry moe 'n curly says...

I realize that, but in this case I can't imagine why the manufacture
would vary the design because the fuses are for keyboard (and maybe
mouse), USB, and Ethernet, and this particular mobo doesn't seem to
have any missing features for these because it does allow wake on
keyboard/mouse/USB/Ethernet.

For that particular model.


Yes, BUT for that particular model the fuses ARE missing.

And?

Our presumptions about why they might have the fuse spots
still doesn't address his original query.

Because its a pointless one. I could rabbit on incessantly about

buffers etc but what's the point?


--
Conor

If Pac-Man affected us as kids, we'd all be running around in darkened
rooms, munching magic pills and listening to repetitive electronic
music.

 

[kony]

On Fri, 19 Aug 2005 20:07:02 +0100, Conor
<conor.turton@gmail.com> wrote:

In article <gcjag1trj0quc7hec5ravaic28911mnc8n@4ax.com>, kony says...
On Thu, 18 Aug 2005 21:01:03 +0100, Conor
conor.turton@gmail.com> wrote:

In article <1124391797.339580.15430@g49g2000cwa.googlegroups.com>,
larry moe 'n curly says...

I realize that, but in this case I can't imagine why the manufacture
would vary the design because the fuses are for keyboard (and maybe
mouse), USB, and Ethernet, and this particular mobo doesn't seem to
have any missing features for these because it does allow wake on
keyboard/mouse/USB/Ethernet.

For that particular model.


Yes, BUT for that particular model the fuses ARE missing.

And?

And, the ports DO work. It was not a matter of omitting
fuses or jumpers for features not present if these are as
described. So, you have to have an alternate way of getting
the power to those ports if it's not traveling the same path
as (practically any) motherboard out there. Perhaps if
you'd more carefully examined more boards you'd appreciate
the distinction, as larry moe 'n curly did have a valid
point and had also recognized that when the fuses aren't
employed there IS a jumper in it's place or copper track
across the pads. This particular board he has is unique in
this respect.

Our presumptions about why they might have the fuse spots
still doesn't address his original query.

Because its a pointless one. I could rabbit on incessantly about
buffers etc but what's the point?

The point is that some of us are interested in motherboard
layout/design/etc... it is a hardware group.