Toshiba TV29C90 problem; Image fades to black...

Peter Pan wrote:

Always thought the singing to be related to the harmonics due from
phase control (the sound isn't 60 Hz), so the capacitors might not like
seeing all that harmonic current.

Also putting a capacitor parallel to the load shouldn't make it dc. The
capacitor had to be rather large, not to mention the need for some
rectifiers. This could be a way to filter out the harmonics on the
lamp.
Click to expand...
Going further back in the thread, the discussion was on filtering
rectified AC.

bud--
 
Jenwin <jenniwinter@hotmail.com> wrote in message
news:1148999108.868260.236230@38g2000cwa.googlegroups.com...
I have Sharp VC-MH704 thats been working fine for the last 4/5 years
through the RF sockets, but never through scart.
It has even been used on 2 different TVs in this way with no problem.

However, now we have just purchased a JVC AV-28E50SK Digital Tv. (Also
purchased a DVD recorder and recently changed it to another model, but
problems occurs with both and without the dvd plugged in).

The problem is.....

The VCR will happily tune and playback the TV through both RF and Scart
sockets, but with either scart or RF plugged in, as well as both
plugged in, the video playback is distorted.

The picture is fine for about 5 seconds then it distorts diagonally
along and goes black and white with sound problems for about 3 seconds
and then is fine again and repeats.

We have tried every type of tv configuration in case of interferance
as well as playing using just the RF to connect as well as just the
Scart, but playback still has the same issue.

Tracking makes no difference.

We thought it may be interference, but no combination seems to help. Is
it a problem with the VCR or with the TV?

As i said the tv will happily use the ariel signal from the vcr to show
the tv channels.

It happens with all pre recorded videos, although we have no tried a
home recorded one, or even tried to record on the vcr.

Any ideas please? This is sending us nuts!!!! Will happily get the VCR
repaired or buy a new one if the problem is with it and not the new TV.


Cheers!!
Click to expand...
Have you tried changing the output RF modulation frequency on the VCR RF out
and tuning in the TV to match ? Diagonal patterning is often due to beating
of harmonics from the local modulator "transmitter" frequency and some
internal or external freequency

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
 
Couldn't that only happen if the clock frequency slowed due to a faulty
crystal or loose loading cap or related fault.
Click to expand...
I suppose it could be that or even a mechanical failure (servo motor
problem,
not enough lubrication, spindle off center, spindle bent), power supply
rails at the motor or controller not to spec (too low or too high). I'm
just wondering what the most likely causes are for the scenario that
I've presented.

Mike

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
Click to expand...
 
Bloody Give up Mate!!
"Weatherlawyer" <Weatherlawyer@hotmail.com> wrote in message
news:1148989231.861903.112930@r44g2000cwb.googlegroups.com...
Art top posted:

Maybe it would be a good idea to at least post the manufacturere and
model
number of the applicable device. Generic questions seem to mandate
generic
answers.
You want me to post all the serial numbers too?
For all the computer hardware that doesn't have any photographs of
people taking them apart?

Really?
Radio Shack items may need the service literature once marketed by Tandy
Corporation, the parent company of Radio Shack.
At least, when you post the make and model we would be a bit more
informed
also.
Hang on. I'll just see if there are any on Google images that I can see
the specs to.

Just wait right there. I won't be long.
"Weatherlawyer" <Weatherlawyer@hotmail.com> wrote in message
news:1148983519.902314.13800@y43g2000cwc.googlegroups.com...

n cook wrote:

If it was tube/amp stuff with 400V on anodes you could understand
being
very
cautious to the point of not even removing the covers , but pc
ancilliary
kit out of bounds ?

So give me some links to these exploits. It has occured to me that in
this day and age the sons of destruction engineering aught to have
pictures of more than scanner anatomies online.

Or are the pip squeaks only capable of copying and pasting the
anatomies of tennis players?
Click to expand...
 
Art wrote:
Bloody Give up Mate!!
Click to expand...
Never!

Not while there is a lamer still to be taught about NOT FUCKING TOP
POSTING YOU WANKER.

Or shouting.
 
eljainc@sbcglobal.net wrote:
Couldn't that only happen if the clock frequency slowed due to a
faulty crystal or loose loading cap or related fault.

I suppose it could be that or even a mechanical failure (servo motor
problem,
not enough lubrication, spindle off center, spindle bent), power
supply rails at the motor or controller not to spec (too low or too
high). I'm just wondering what the most likely causes are for the
scenario that I've presented.

Mike


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
Click to expand...
A regular CD player can only slow down a small bit and still get
intelligible audio. As it slows down a bit, the sound may get static-y and
at some point probably cut out. Decoder IC's are locked to the incoming
signal via a crystal oscillator. If the frame drop-out exceeds a certain
amount, they just mute or stop playing.
Don't adjust the potentiometer on the pickup - this is a laser power
adjustment and at best it would accomplish nothing for you, at worst it
would destroy the laser diode.
Wouldn't hurt to clean the lens and lube the spindle motor top bearing - but
don't expect any miracles.

Mark Z.
 
Mark D. Zacharias <spammenot@nonsense.net> wrote in message
news:5Vefg.110661$F_3.36513@newssvr29.news.prodigy.net...
eljainc@sbcglobal.net wrote:
Couldn't that only happen if the clock frequency slowed due to a
faulty crystal or loose loading cap or related fault.

I suppose it could be that or even a mechanical failure (servo motor
problem,
not enough lubrication, spindle off center, spindle bent), power
supply rails at the motor or controller not to spec (too low or too
high). I'm just wondering what the most likely causes are for the
scenario that I've presented.

Mike


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

A regular CD player can only slow down a small bit and still get
intelligible audio. As it slows down a bit, the sound may get static-y and
at some point probably cut out. Decoder IC's are locked to the incoming
signal via a crystal oscillator. If the frame drop-out exceeds a certain
amount, they just mute or stop playing.
Don't adjust the potentiometer on the pickup - this is a laser power
adjustment and at best it would accomplish nothing for you, at worst it
would destroy the laser diode.
Wouldn't hurt to clean the lens and lube the spindle motor top bearing -
but
don't expect any miracles.

Mark Z.
Click to expand...
I would have thought a bit of braking would have no effect until its run out
of repeat redundant code and then drop out rather than drop pitch.
Next time I have one open I will try loading the timing crystal and see if
that drops the pitch even if only for 1/2 second or so.
I've come across a cracked crystal from being dropped causing intermittent
problems, not in a CD though.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
 
n cook wrote:
Mark D. Zacharias <spammenot@nonsense.net> wrote in message
news:5Vefg.110661$F_3.36513@newssvr29.news.prodigy.net...
eljainc@sbcglobal.net wrote:
Couldn't that only happen if the clock frequency slowed due to a
faulty crystal or loose loading cap or related fault.

I suppose it could be that or even a mechanical failure (servo motor
problem,
not enough lubrication, spindle off center, spindle bent), power
supply rails at the motor or controller not to spec (too low or too
high). I'm just wondering what the most likely causes are for the
scenario that I've presented.

Mike


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

A regular CD player can only slow down a small bit and still get
intelligible audio. As it slows down a bit, the sound may get
static-y and at some point probably cut out. Decoder IC's are locked
to the incoming signal via a crystal oscillator. If the frame
drop-out exceeds a certain amount, they just mute or stop playing.
Don't adjust the potentiometer on the pickup - this is a laser power
adjustment and at best it would accomplish nothing for you, at worst
it would destroy the laser diode.
Wouldn't hurt to clean the lens and lube the spindle motor top
bearing - but don't expect any miracles.

Mark Z.



I would have thought a bit of braking would have no effect until its
run out of repeat redundant code and then drop out rather than drop
pitch.
Next time I have one open I will try loading the timing crystal and
see if that drops the pitch even if only for 1/2 second or so.
I've come across a cracked crystal from being dropped causing
intermittent problems, not in a CD though.
Click to expand...

I've tried the old "drag down the rotation a bit by placing your finger
along the edge of the spinning disc" on a number of players over the years.
You have to be pretty careful about how much drag you impart to the disc,
but the effects are pretty readily observable. It's rare that you'd really
get any useful info from this technique, I'll admit. Mostly just testing for
borderline playing problems, like decoder IC's which seem to be putting out
a bad duty cycle for the spindle drive. You can observe the spindle motor
drive waveform during startup (100%), during disc run (around 50%), and vary
it a bit by the method I described. You can get a pretty good idea if your
problem is mechanical or a circuit problem. Of course, these days players
are so cheap, and test points so difficult to find or get to, that this type
of troubleshooting isn't done much anymore.


Mark Z.
 
"Mark D. Zacharias" <spammenot@nonsense.net> wrote in message
news:IYAfg.36979$4L1.29236@newssvr11.news.prodigy.com...
n cook wrote:
Mark D. Zacharias <spammenot@nonsense.net> wrote in message
news:5Vefg.110661$F_3.36513@newssvr29.news.prodigy.net...
eljainc@sbcglobal.net wrote:
Couldn't that only happen if the clock frequency slowed due to a
faulty crystal or loose loading cap or related fault.

I suppose it could be that or even a mechanical failure (servo motor
problem,
not enough lubrication, spindle off center, spindle bent), power
supply rails at the motor or controller not to spec (too low or too
high). I'm just wondering what the most likely causes are for the
scenario that I've presented.

Mike


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

A regular CD player can only slow down a small bit and still get
intelligible audio. As it slows down a bit, the sound may get
static-y and at some point probably cut out. Decoder IC's are locked
to the incoming signal via a crystal oscillator. If the frame
drop-out exceeds a certain amount, they just mute or stop playing.
Don't adjust the potentiometer on the pickup - this is a laser power
adjustment and at best it would accomplish nothing for you, at worst
it would destroy the laser diode.
Wouldn't hurt to clean the lens and lube the spindle motor top
bearing - but don't expect any miracles.

Mark Z.



I would have thought a bit of braking would have no effect until its
run out of repeat redundant code and then drop out rather than drop
pitch.
Next time I have one open I will try loading the timing crystal and
see if that drops the pitch even if only for 1/2 second or so.
I've come across a cracked crystal from being dropped causing
intermittent problems, not in a CD though.


I've tried the old "drag down the rotation a bit by placing your finger
along the edge of the spinning disc" on a number of players over the
years. You have to be pretty careful about how much drag you impart to the
disc, but the effects are pretty readily observable. It's rare that you'd
really get any useful info from this technique, I'll admit. Mostly just
testing for borderline playing problems, like decoder IC's which seem to
be putting out a bad duty cycle for the spindle drive. You can observe the
spindle motor drive waveform during startup (100%), during disc run
(around 50%), and vary it a bit by the method I described. You can get a
pretty good idea if your problem is mechanical or a circuit problem. Of
course, these days players are so cheap, and test points so difficult to
find or get to, that this type of troubleshooting isn't done much anymore.


Mark Z.
Click to expand...
A couple of years back, I had in a boombox type player for repair - Pan as I
recall - and it had had a " Disco " mod put in it. This comprised a VCO IC
and a remote pot. It was a professionally made item, and had a proper
silk-screened self-adhesive panel foil to go around the pot on the outside
of the case. This foil carried the legend " Pitch ". The system clock
crystal had been removed, and the output from this VCO substituted by wire,
directly into one of the vacated print holes. Rotation of the pot provided a
very effective and smooth pitch variation, which easily matched the +/- 16%
that you see on the semi-pro bedroom studio units.

As far as I can see, variation of the servo clock frequency, is the only way
that the OP's problem can be occuring. I agree with everyone else, that as
soon as the data rate falls below the minimum buffer memory 'evening out'
capability, the result will be data dropout initially, followed by full
muting, as the servos drop out of lock.

Arfa
 
Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:8ULfg.10$lQ.2@newsfe3-gui.ntli.net...
"Mark D. Zacharias" <spammenot@nonsense.net> wrote in message
news:IYAfg.36979$4L1.29236@newssvr11.news.prodigy.com...
n cook wrote:
Mark D. Zacharias <spammenot@nonsense.net> wrote in message
news:5Vefg.110661$F_3.36513@newssvr29.news.prodigy.net...
eljainc@sbcglobal.net wrote:
Couldn't that only happen if the clock frequency slowed due to a
faulty crystal or loose loading cap or related fault.

I suppose it could be that or even a mechanical failure (servo motor
problem,
not enough lubrication, spindle off center, spindle bent), power
supply rails at the motor or controller not to spec (too low or too
high). I'm just wondering what the most likely causes are for the
scenario that I've presented.

Mike


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

A regular CD player can only slow down a small bit and still get
intelligible audio. As it slows down a bit, the sound may get
static-y and at some point probably cut out. Decoder IC's are locked
to the incoming signal via a crystal oscillator. If the frame
drop-out exceeds a certain amount, they just mute or stop playing.
Don't adjust the potentiometer on the pickup - this is a laser power
adjustment and at best it would accomplish nothing for you, at worst
it would destroy the laser diode.
Wouldn't hurt to clean the lens and lube the spindle motor top
bearing - but don't expect any miracles.

Mark Z.



I would have thought a bit of braking would have no effect until its
run out of repeat redundant code and then drop out rather than drop
pitch.
Next time I have one open I will try loading the timing crystal and
see if that drops the pitch even if only for 1/2 second or so.
I've come across a cracked crystal from being dropped causing
intermittent problems, not in a CD though.


I've tried the old "drag down the rotation a bit by placing your finger
along the edge of the spinning disc" on a number of players over the
years. You have to be pretty careful about how much drag you impart to
the
disc, but the effects are pretty readily observable. It's rare that
you'd
really get any useful info from this technique, I'll admit. Mostly just
testing for borderline playing problems, like decoder IC's which seem to
be putting out a bad duty cycle for the spindle drive. You can observe
the
spindle motor drive waveform during startup (100%), during disc run
(around 50%), and vary it a bit by the method I described. You can get a
pretty good idea if your problem is mechanical or a circuit problem. Of
course, these days players are so cheap, and test points so difficult to
find or get to, that this type of troubleshooting isn't done much
anymore.


Mark Z.


A couple of years back, I had in a boombox type player for repair - Pan as
I
recall - and it had had a " Disco " mod put in it. This comprised a VCO IC
and a remote pot. It was a professionally made item, and had a proper
silk-screened self-adhesive panel foil to go around the pot on the outside
of the case. This foil carried the legend " Pitch ". The system clock
crystal had been removed, and the output from this VCO substituted by
wire,
directly into one of the vacated print holes. Rotation of the pot provided
a
very effective and smooth pitch variation, which easily matched the +/-
16%
that you see on the semi-pro bedroom studio units.

As far as I can see, variation of the servo clock frequency, is the only
way
that the OP's problem can be occuring. I agree with everyone else, that as
soon as the data rate falls below the minimum buffer memory 'evening out'
capability, the result will be data dropout initially, followed by full
muting, as the servos drop out of lock.

Arfa
Click to expand...
When I've some time I'm going to mod one in such a manner just for fun.
So to re-cap, to the OP, then a faulty crystal could lead to the observed
effect ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
 
"n cook" <diverse8@gazeta.pl> wrote in message
news:e5p05e$ffv$1@inews.gazeta.pl...
Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:8ULfg.10$lQ.2@newsfe3-gui.ntli.net...

"Mark D. Zacharias" <spammenot@nonsense.net> wrote in message
news:IYAfg.36979$4L1.29236@newssvr11.news.prodigy.com...
n cook wrote:
Mark D. Zacharias <spammenot@nonsense.net> wrote in message
news:5Vefg.110661$F_3.36513@newssvr29.news.prodigy.net...
eljainc@sbcglobal.net wrote:
Couldn't that only happen if the clock frequency slowed due to a
faulty crystal or loose loading cap or related fault.

I suppose it could be that or even a mechanical failure (servo motor
problem,
not enough lubrication, spindle off center, spindle bent), power
supply rails at the motor or controller not to spec (too low or too
high). I'm just wondering what the most likely causes are for the
scenario that I've presented.

Mike


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

A regular CD player can only slow down a small bit and still get
intelligible audio. As it slows down a bit, the sound may get
static-y and at some point probably cut out. Decoder IC's are locked
to the incoming signal via a crystal oscillator. If the frame
drop-out exceeds a certain amount, they just mute or stop playing.
Don't adjust the potentiometer on the pickup - this is a laser power
adjustment and at best it would accomplish nothing for you, at worst
it would destroy the laser diode.
Wouldn't hurt to clean the lens and lube the spindle motor top
bearing - but don't expect any miracles.

Mark Z.



I would have thought a bit of braking would have no effect until its
run out of repeat redundant code and then drop out rather than drop
pitch.
Next time I have one open I will try loading the timing crystal and
see if that drops the pitch even if only for 1/2 second or so.
I've come across a cracked crystal from being dropped causing
intermittent problems, not in a CD though.


I've tried the old "drag down the rotation a bit by placing your
finger
along the edge of the spinning disc" on a number of players over the
years. You have to be pretty careful about how much drag you impart to
the
disc, but the effects are pretty readily observable. It's rare that
you'd
really get any useful info from this technique, I'll admit. Mostly just
testing for borderline playing problems, like decoder IC's which seem
to
be putting out a bad duty cycle for the spindle drive. You can observe
the
spindle motor drive waveform during startup (100%), during disc run
(around 50%), and vary it a bit by the method I described. You can get
a
pretty good idea if your problem is mechanical or a circuit problem. Of
course, these days players are so cheap, and test points so difficult
to
find or get to, that this type of troubleshooting isn't done much
anymore.


Mark Z.


A couple of years back, I had in a boombox type player for repair - Pan
as
I
recall - and it had had a " Disco " mod put in it. This comprised a VCO
IC
and a remote pot. It was a professionally made item, and had a proper
silk-screened self-adhesive panel foil to go around the pot on the
outside
of the case. This foil carried the legend " Pitch ". The system clock
crystal had been removed, and the output from this VCO substituted by
wire,
directly into one of the vacated print holes. Rotation of the pot
provided
a
very effective and smooth pitch variation, which easily matched the +/-
16%
that you see on the semi-pro bedroom studio units.

As far as I can see, variation of the servo clock frequency, is the only
way
that the OP's problem can be occuring. I agree with everyone else, that
as
soon as the data rate falls below the minimum buffer memory 'evening out'
capability, the result will be data dropout initially, followed by full
muting, as the servos drop out of lock.

Arfa



When I've some time I'm going to mod one in such a manner just for fun.
So to re-cap, to the OP, then a faulty crystal could lead to the observed
effect ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



Yep, that's my feeling.
Click to expand...

Arfa
 
When I've some time I'm going to mod one in such a manner just for
fun. So to re-cap, to the OP, then a faulty crystal could lead to
the observed effect ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



Yep, that's my feeling.

Arfa
Click to expand...
Sometimes we also see simple bad solder connections at the crystals...

Mark Z.
 
"Mark D. Zacharias" <spammenot@nonsense.net> wrote in message
news:HDcgg.130553$F_3.29082@newssvr29.news.prodigy.net...
When I've some time I'm going to mod one in such a manner just for
fun. So to re-cap, to the OP, then a faulty crystal could lead to
the observed effect ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



Yep, that's my feeling.

Arfa

Sometimes we also see simple bad solder connections at the crystals...

Mark Z.

That's a fact, Mark - particularly since the manufacturers have been forced
Click to expand...
down this nonsense lead-free path ...

Arfa
 
"Doc" <docsavage20@xhotmail.comx> wrote in message
news:ZVmhg.2472$lf4.2379@newsread1.news.pas.earthlink.net...
Hitchy Compaq Deskpro PIII, is there a way to definitively test the CPU to
see if it could be the culprit?
Click to expand...
reposting to hit the other groups.
 
Put it into another motherboard, having video card, minimual memory, a
mouse, and keyboard. If you want, hook up a floppy to load a simple
diagnostic programme. The cpu, being functional should allow access to the
bios, as well as produce positive results to the diagnostics.
"Doc" <docsavage20@xhotmail.comx> wrote in message
news:rXmhg.2475$lf4.569@newsread1.news.pas.earthlink.net...
"Doc" <docsavage20@xhotmail.comx> wrote in message
news:ZVmhg.2472$lf4.2379@newsread1.news.pas.earthlink.net...
Hitchy Compaq Deskpro PIII, is there a way to definitively test the CPU
to
see if it could be the culprit?

reposting to hit the other groups.
Click to expand...
 
I found this pic of a processor that's the same as my 933

http://idg.allegro.pl/show_item.php?item=107506882

The printing on mine is somewhat different, but the specs are the same -
Mine says INTEL '81 Costa Rica 933 /256/133/1.75V on the top edge and on the
bottom edge is 3116A390-0627 SL52Q

What would you call this processor? If I'm looking for a mobo to fit it,
what should I look for?

Thanks for all input
 
That is a Socket 370 Pentium III processor. A motherboard to support it MUST
provide 1.75v and MUST support 133MHz front-side bus. Boards with Intel
chipsets and supporting this CPU would use the 810E or an 815 chipset.

.... Ben Myers

On Wed, 07 Jun 2006 02:24:11 GMT, "Doc" <docsavage20@xhotmail.comx> wrote:

I found this pic of a processor that's the same as my 933

http://idg.allegro.pl/show_item.php?item=107506882

The printing on mine is somewhat different, but the specs are the same -
Mine says INTEL '81 Costa Rica 933 /256/133/1.75V on the top edge and on the
bottom edge is 3116A390-0627 SL52Q

What would you call this processor? If I'm looking for a mobo to fit it,
what should I look for?

Thanks for all input
Click to expand...
 
On Wed, 07 Jun 2006 02:24:11 GMT, "Doc"
<docsavage20@xhotmail.comx> wrote:

I found this pic of a processor that's the same as my 933

http://idg.allegro.pl/show_item.php?item=107506882

The printing on mine is somewhat different, but the specs are the same -
Mine says INTEL '81 Costa Rica 933 /256/133/1.75V on the top edge and on the
bottom edge is 3116A390-0627 SL52Q

What would you call this processor? If I'm looking for a mobo to fit it,
what should I look for?

Thanks for all input
Click to expand...
It is a Coppermine P3.

You need a socket 370 motherboard, a later model that is
capable of 133MHz FSB. The most desirable chipsets tended
to be Intel 815 (except that it can support only 512MB total
memory) or Via 694 (or 694T). There were 815 boards with
integrated video or PLE133 was the Via version with
integrated video.

Sis 630(?) supported it too but Sis chipsets were often a
real PITA, some of them didn't even support all the ATA
modes properly and would end up in PIO mode instead.

Since the boards are now mostly at surplus 'sites, you might
choose based on cost and "newness"... a new board would be
highly preferred over a used one but how much money did you
want to 'sink into a system at this point? Sometimes you
can find barebones systems that include the case, power,
motherboard for under $60, but then again sometimes these
also include the CPU for little if any addt'l cost.
 
"Doc" <docsavage20@xhotmail.comx> wrote in message
news:rXmhg.2475$lf4.569@newsread1.news.pas.earthlink.net...
"Doc" <docsavage20@xhotmail.comx> wrote in message
news:ZVmhg.2472$lf4.2379@newsread1.news.pas.earthlink.net...
Hitchy Compaq Deskpro PIII, is there a way to definitively test the CPU
to
see if it could be the culprit?
Click to expand...
'Hitchy' is a pretty vague symptom. If you could clarify the problem you're
having, you'll get better feedback.

There isn't a practical way to test the processor outside of the PC. There
also isn't a practical way to test the processor in a PC that is
troublesome. The most widely used diagnostic procedure in a case where a
faulty processor is suspected is to simply swap in a known good processor or
swap the suspect processor into a known good system. Either process
involves having additional hardware on hand to do the test. I suppose if
you have an advanced understanding of processor architecture, you could
scope test the pins during a failure condition. But the $1 / hr labor rate
rule applies here. How much does a P III processor cost?

Most processors operate erratically due to cooling problems - loose or
inoperational heat sink / fan assemblies. Most intermittently dead PCs are
caused by motherboard problems. Almost all problems associated with poor
performance / degraded performance are related to software.

Of course - any peripheral that is running off the system is a potential
failure that can drag the whole thing down with it - intermittently OR
consistently. That's why you'll always see reccomendations to remove ALL
equipment except the motherboard, the processor, 1 stick of memory, the
power supply, and the video card. NOTHING else is required for the machine
to POST. If it doesn't POST at that point, you've narrowed the field of
possibilities greatly and can swap out parts in that small group. If it
does POST, adding components back into the mix one at a time is a good way
to test for re-appearance of the failure.

Also - FWIW - In 10 + years of building / repairing / maintaining PCs, I've
only seen two bad processors. Both were AMDs Athlons pulled off severely
blown mainboards. I'd bet a bottle of Jack that the problem is NOT a bad
PIII processor if the mainboard board is still running.
 
If I have one machine set up to capture/edit video and another for music
production, what would be a good way to transfer files between them? Say, a
musical piece I've created that I want to use in a video.

If both machines have Firewire or USB 2, can those be used for rapid data
transmission between machines? If so, how would it be done? Is there more to
it than simply running a cable between machines?

The reasons for doing this are if the video machine is rendering, I can
still be working on recording, and also so I can use the DVD burners in one
machine for everything.

Thanks for all input.
 
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