Toshiba TV29C90 problem; Image fades to black...

[Chaos Master]

JW (none@dev.nul) said those last words:

I just can't imagine why *anyone* would be interested in such weird stuff.
At least the "See <insert favorite supermodel here> NUDE!" spam made some
sense...

As I say in Portuguese: "there are fools for everything."

[]s
--
Š Chaos Master. | "I've tried so hard to tell
My Evanescence HP is at: | myself that you're gone
http://marreka.no-ip.com | And thought you were still
(most often offline... ) | with me..."
------------------------- -- Evanescence, "My Immortal"

 

[geo73]

I have checked the web and some people
talk about resoldering an IC?
Is that so? Does anyone know which IC?

Thanks

 

[geo73]

Finished!

Resodering IC 37001 @ the board under the DVD tray.
Solution found at this website:
http:\\www.highlandelectrix.fsnet.co.uk

 

[Boris]

Hey Rudolf,
A little correction (to be precise): many 2-pin devices, such as diodes and
electrolytic capacitors to name a few, DO have polarity that should be
considered!
Boris


"Rudolf Ladyzhenskii"

3-pinned device wil not fit wrong way around. 2 pin devices do not have
"polarity". It is does not matter how you fit it.

 

[Franc Zabkar]

On Thu, 1 Jul 2004 09:58:49 -0400, "Boris" <bandreev@abv.bg> put
finger to keyboard and composed:

Hey Rudolf,
A little correction (to be precise): many 2-pin devices, such as diodes and
electrolytic capacitors to name a few, DO have polarity that should be
considered!
Boris

But he's not talking about just any two-pin device, he's talking about
a *PTC*. This is a "positive temperature coefficient" resistor.
Furthermore, to remove *any* doubt, the PTC is connected to AC, so
polarity cannot possibly be an issue.

"Rudolf Ladyzhenskii"
3-pinned device wil not fit wrong way around. 2 pin devices do not have
"polarity". It is does not matter how you fit it.

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

 

[Harry Conover]

Rick <fonebone154@earthlink.net> wrote in message news:<6t36e0d23usfthtft7lrhc073l8sj2igpg@4ax.com>...

On Wed, 30 Jun 2004 18:05:48 GMT, fannyrogers@nc.rr.com wrote:
Unfortunatly this appears to be a retail page. I need information on
how to connect a PC powersupply to a lead-acid batter to use it as a
charger. I wouldn't know where to begin to try to find a book about
it. That's why I tried to use the newsgroups.

Perhaps it's problematic on my part, but the notion of someone
attempting to adapt a PC power supply to charge lead-acid batteries
strikes me as being beyond even the ridiculous.

Harry C.

 

[G. R. L. Cowan]

Harry Conover wrote:

Rick <fonebone154@earthlink.net> wrote in message news:<6t36e0d23usfthtft7lrhc073l8sj2igpg@4ax.com>...
On Wed, 30 Jun 2004 18:05:48 GMT, fannyrogers@nc.rr.com wrote:
Unfortunatly this appears to be a retail page. I need information on
how to connect a PC powersupply to a lead-acid batter to use it as a
charger. I wouldn't know where to begin to try to find a book about
it. That's why I tried to use the newsgroups.

Perhaps it's problematic on my part, but the notion of someone
attempting to adapt a PC power supply to charge lead-acid batteries
strikes me as being beyond even the ridiculous.

Maybe slightly beyond. PC power supplies include 12-V lines;
car batteries are 12-volt. It might just barely work,
although to charge a 12-V battery you really want a volt or two more.

I thought of trying it recently but had a broken
battery charger as such, and found it could be made to work.


--- Graham Cowan
http://www.eagle.ca/~gcowan/Paper_for_11th_CHC.doc --
How individual mobility gains nuclear cachet.
Link if you want it to happen

 

[Harry Conover]

"G. R. L. Cowan" <gcowan@eagle.ca> wrote in message news:<40E5EBAA.860508CC@eagle.ca>...

Harry Conover wrote:

Rick <fonebone154@earthlink.net> wrote in message news:<6t36e0d23usfthtft7lrhc073l8sj2igpg@4ax.com>...
On Wed, 30 Jun 2004 18:05:48 GMT, fannyrogers@nc.rr.com wrote:
Unfortunatly this appears to be a retail page. I need information on
how to connect a PC powersupply to a lead-acid batter to use it as a
charger. I wouldn't know where to begin to try to find a book about
it. That's why I tried to use the newsgroups.

Perhaps it's problematic on my part, but the notion of someone
attempting to adapt a PC power supply to charge lead-acid batteries
strikes me as being beyond even the ridiculous.

Maybe slightly beyond. PC power supplies include 12-V lines;
car batteries are 12-volt. It might just barely work,
although to charge a 12-V battery you really want a volt or two more.

I thought of trying it recently but had a broken
battery charger as such, and found it could be made to work.

My point was that a PC power suppy is designed to supply only minimal
currents at 12-volts, certainly much less than you want want for a
battery charger for 12-volt lead-acid batteries. At best it would only
partially charge the battery, and take a long time to do even that.

Also, as you correctly point out, the PC supply does not put out
sufficient voltage to do the job properly, since you need between 14
and 16 volts to do that.

12-volt battery charger are incredibly inexpensive, so why not use the
correct tool to do the job?

Harry C.

 

[Tim Auton]

hhc314@yahoo.com (Harry Conover) wrote:
[snip]

My point was that a PC power suppy is designed to supply only minimal
currents at 12-volts, certainly much less than you want want for a
battery charger for 12-volt lead-acid batteries.

Mine provides 26A. Hardly what I'd call minimal.


Tim
--
My last .sig was rubbish too.

 

[John Fields]

On Sun, 04 Jul 2004 14:38:31 +0100, Tim Auton
<tim.auton@uton.[groupSexWithoutTheY]> wrote:

hhc314@yahoo.com (Harry Conover) wrote:
[snip]
My point was that a PC power suppy is designed to supply only minimal
currents at 12-volts, certainly much less than you want want for a
battery charger for 12-volt lead-acid batteries.

Mine provides 26A. Hardly what I'd call minimal.

Even if it could supply an infinite amount of current, with only a 12V
output it could _never_ fully charge the battery.

http://www.panasonic.com/industrial/battery/oem/images/pdf/Panasonic_VRLA_ChargingMethods.pdf

and, for specific information on charging voltage ("control voltage",
Panasonic calls it)

http://www.panasonic.com/industrial/battery/oem/images/pdf/Panasonic_VRLA_LC-R121R3P.pdf
--
John Fields

 

[Bill Jeffrey]

Tim Auton wrote:

hhc314@yahoo.com (Harry Conover) wrote:
[snip]

My point was that a PC power suppy is designed to supply only minimal
currents at 12-volts, certainly much less than you want want for a
battery charger for 12-volt lead-acid batteries.


Mine provides 26A. Hardly what I'd call minimal.


Tim

Tim -

26 amps at 12 volts? That is not your common garden variety PC power
supply. I would bet that it is 26 amps at 5 volts, and some much lower
number out of the 12-volt spigot.

Not that it matters - this is still not a good way to charge batteries.

Bill Jeffrey

 

[Tim Auton]

John Fields <jfields@austininstruments.com> wrote:

On Sun, 04 Jul 2004 14:38:31 +0100, Tim Auton
tim.auton@uton.[groupSexWithoutTheY]> wrote:
hhc314@yahoo.com (Harry Conover) wrote:
[snip]
My point was that a PC power suppy is designed to supply only minimal
currents at 12-volts, certainly much less than you want want for a
battery charger for 12-volt lead-acid batteries.

Mine provides 26A. Hardly what I'd call minimal.

Even if it could supply an infinite amount of current, with only a 12V
output it could _never_ fully charge the battery.

Not unless you tweaked it to give more than 12V, no.

I just wanted to point out that PC PSUs give more than a "minimal"
current on the +12V line. Even the worst can supply 14A or so, 20A is
more typical. Increasingly CPUs draw power from the +12V line (via a
regulator of course) and they are getting up above 100W these days.


Tim
--
My last .sig was rubbish too.

 

[Tim Auton]

Bill Jeffrey <wjeffrey@TAKE-THIS-OUTalum.mit.edu> wrote:

Tim Auton wrote:
hhc314@yahoo.com (Harry Conover) wrote:
[snip]

My point was that a PC power suppy is designed to supply only minimal
currents at 12-volts, certainly much less than you want want for a
battery charger for 12-volt lead-acid batteries.

Mine provides 26A. Hardly what I'd call minimal.

26 amps at 12 volts? That is not your common garden variety PC power
supply.

It's a decent quality one, but not very exceptional and not even the
biggest in the range. It's an Enermax EG365:

http://www.enermax.com.tw/products_page.php?Tid=1&gon=231&Gid=18&Gid2=22

Enermax do provide more current on the +12V line than many PSUs, but
you'd be hard pressed to find one that'll provide less than 10A, most
providing 15A+. The 350W no-name PSU in my other PC provides 16A.

A recent P4 burns the best part of 100W and gets that from the 12V
line (via a regulator of course) - that's 8A before you've even
installed a drive, and they are another 1-3A (spin-up) each.

Not that it matters - this is still not a good way to charge batteries.

No, I can't argue with that


Tim
--
My last .sig was rubbish too.

 

[Mike]

In article <7ce4e226.0407031906.ab6d598@posting.google.com>,
Harry Conover <hhc314@yahoo.com> wrote:

Also, as you correctly point out, the PC supply does not put out
sufficient voltage to do the job properly, since you need between 14
and 16 volts to do that.

.... and some level of current limiting to stop the battery getting destroyed
(which a PC power supply won't give you -- it'll work, or overload and
shutdown).

12-volt battery charger are incredibly inexpensive, so why not use the
correct tool to do the job?

Also, 12V L-A batteries are not exactly a cheap throwaway item, so why
not use the correct tool to do the job? What you are saving on bodging up
an inadequate PSU to charge the battery, you will more than lose in broken
batteries!
--
--------------------------------------+------------------------------------
Mike Brown: mjb[at]pootle.demon.co.uk | http://www.pootle.demon.co.uk/

 

[Watson A.Name - \"Watt Su]

"Harry Conover" <hhc314@yahoo.com> wrote in message
news:7ce4e226.0407031906.ab6d598@posting.google.com...

"G. R. L. Cowan" <gcowan@eagle.ca> wrote in message
news:<40E5EBAA.860508CC@eagle.ca>...
Harry Conover wrote:

Rick <fonebone154@earthlink.net> wrote in message
news:<6t36e0d23usfthtft7lrhc073l8sj2igpg@4ax.com>...
On Wed, 30 Jun 2004 18:05:48 GMT, fannyrogers@nc.rr.com wrote:
Unfortunatly this appears to be a retail page. I need
information on
how to connect a PC powersupply to a lead-acid batter to use it
as a
charger. I wouldn't know where to begin to try to find a book
about
it. That's why I tried to use the newsgroups.

Perhaps it's problematic on my part, but the notion of someone
attempting to adapt a PC power supply to charge lead-acid
batteries
strikes me as being beyond even the ridiculous.

Maybe slightly beyond. PC power supplies include 12-V lines;
car batteries are 12-volt. It might just barely work,
although to charge a 12-V battery you really want a volt or two
more.

I thought of trying it recently but had a broken
battery charger as such, and found it could be made to work.

My point was that a PC power suppy is designed to supply only minimal
currents at 12-volts, certainly much less than you want want for a

BZZT! Wrong! Oh, that's right, you're never wrong.

This one is typical and supplies 12V at 15A.
http://www.keypower.com/proddetail.asp?category=Switching+Power+Supply&s
ubcategory=PFC%2CATX%2C+PS2&linenumber=55

DOH!

[snip]

Harry C.

 

[Harry Conover]

"Watson A.Name - \"Watt Sun, the Dark Remover\"" <NOSPAM@dslextreme.com> wrote in message news:<10ek2ojltc3f35a@corp.supernews.com>...

"Harry Conover" <hhc314@yahoo.com> wrote in message
news:7ce4e226.0407031906.ab6d598@posting.google.com...
"G. R. L. Cowan" <gcowan@eagle.ca> wrote in message
news:<40E5EBAA.860508CC@eagle.ca>...
Harry Conover wrote:

Rick <fonebone154@earthlink.net> wrote in message
news:<6t36e0d23usfthtft7lrhc073l8sj2igpg@4ax.com>...
On Wed, 30 Jun 2004 18:05:48 GMT, fannyrogers@nc.rr.com wrote:
Unfortunatly this appears to be a retail page. I need
information on
how to connect a PC powersupply to a lead-acid batter to use it
as a
charger. I wouldn't know where to begin to try to find a book
about
it. That's why I tried to use the newsgroups.

Perhaps it's problematic on my part, but the notion of someone
attempting to adapt a PC power supply to charge lead-acid
batteries
strikes me as being beyond even the ridiculous.

Maybe slightly beyond. PC power supplies include 12-V lines;
car batteries are 12-volt. It might just barely work,
although to charge a 12-V battery you really want a volt or two
more.

I thought of trying it recently but had a broken
battery charger as such, and found it could be made to work.

My point was that a PC power suppy is designed to supply only minimal
currents at 12-volts, certainly much less than you want want for a

BZZT! Wrong! Oh, that's right, you're never wrong.

This one is typical and supplies 12V at 15A.
http://www.keypower.com/proddetail.asp?category=Switching+Power+Supply&s
ubcategory=PFC%2CATX%2C+PS2&linenumber=55

DOH!

[snip]

Harry C.

Actually no PC supply of which I'm aware is capable of putting out 12V
at more than a couple of amps.

Perhaps you fail to grasp the distinction between a PC, AT, and ATX
type power supplies? Do you think that's possible? Notwithstanding,
none will function well in the proposed application.

Then too, you may also not realize that more than 12V is required to
properly charge a 12V lead-acid battery to capacity. Try starting with
a current limited source of 16V or so, and then taper the charging
current as the battery approaches fully charged condition.

Do you believe that a desktop computer power supply will do this for
you without making substantial internal design changes and additions?

Duh!

Harry C.

 

[Duane C. Johnson]

Hi Harry;

Harry Conover wrote:

Actually no PC supply of which I'm aware is capable
of putting out 12V at more than a couple of amps.

Perhaps you fail to grasp the distinction between a
PC, AT, and ATX type power supplies? Do you think
that's possible? Notwithstanding, none will function
well in the proposed application.

Then too, you may also not realize that more than 12V
is required to properly charge a 12V lead-acid battery
to capacity. Try starting with a current limited source
of 16V or so, and then taper the charging current as
the battery approaches fully charged condition.

Do you believe that a desktop computer power supply
will do this for you without making substantial
internal design changes and additions?

Duh!
Harry C.

I agree!
Not to mention that usually this type of supply only
hard regulates one main channel and the rest are slave
or side channels. Generally the main channel has the
best regulation.

The 12V side channel current is dependent on how much
current is being drawn by the main channel. This is
kind of wasteful if you have to put a dummy load on
the main channel in order to get the side channel to
work.

These computer supplies are just too specialized for
this application without a lot of modifications.

Duane

--
Home of the $35 Solar Tracker Receiver
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http://www.redrok.com (Web site) ===

 

[Jean-Yves]

In article <40f4c4e0$1@news.alphalink.com.au>,
Andrew Tweddle <sarason@alphalink.com.au> wrote:

I have one of these machines (its really a SONY inside, no idea which
model). Anyway the fault is it turns off after 2 seconds when connected
to a PC. I have found one dying cap CP78 on the power supply board, but
can't seem to make much headway.
The second question is, does this model work in normal operation on the
PC 640*480 VGA mode or did Apple not allow this in this model. The Apple
data sheet isn't particularly explicit.

Thanks Andrew

this unit supports other resolutions than 640x480
but you need a computer which supports multiple frequencies monitors

on (very) old macs, this display is black.
does it turn really off or does only the led comes yellow after 2 secs ?
if it is, it's probably not a power supply fault, but a logic (video
fault) as the monitor detects the video and comes green only if it has
video it can display.

dont know also which sony model it is..

--
Jean-Yves.

 

[Andy Cuffe]

On Wed, 14 Jul 2004 19:19:26 +0200, Jean-Yves <jypochez_nopub@free.fr>
wrote:

In article <40f4c4e0$1@news.alphalink.com.au>,
Andrew Tweddle <sarason@alphalink.com.au> wrote:

I have one of these machines (its really a SONY inside, no idea which
model). Anyway the fault is it turns off after 2 seconds when connected
to a PC. I have found one dying cap CP78 on the power supply board, but
can't seem to make much headway.
The second question is, does this model work in normal operation on the
PC 640*480 VGA mode or did Apple not allow this in this model. The Apple
data sheet isn't particularly explicit.

Thanks Andrew

this unit supports other resolutions than 640x480
but you need a computer which supports multiple frequencies monitors

on (very) old macs, this display is black.
does it turn really off or does only the led comes yellow after 2 secs ?
if it is, it's probably not a power supply fault, but a logic (video
fault) as the monitor detects the video and comes green only if it has
video it can display.

dont know also which sony model it is..

This monitor uses a sony CRT, but was designed by apple. I don't
think there's any way to get a schematic of it. Apple only supplies
enough information for board swapping.
Andy Cuffe
baltimora@psu.edu

 

[Wes Golden]

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