Pioneer plasma turns off: update

"DaveC" wrote in message
obal.net...
Pioneer plasma model PDP-V401. Original symptom: shut off after seconds or
minutes or hours of operation. Power LED blinked error code 6 (as best I
can
determine the meaning of this code from Googling (I have no manual) this
means PS fault).

Replaced 16 electrolytic caps in the main PS that measured high ESR.

Now when first powered on after an overnight rest, it will shut off
immediately (stays on for maybe 5 seconds). After power cycling the main
switch (can't be done via remote -- must use the switch on the back), it
will
run all day without problem.

All PS voltages are OK (factory sticker inside lists them); all are a few
tenths high (ie, 5v = 5.04).

What next step would you take in troubleshooting this PS?

Thanks.
--
DaveC

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Stick it in the vise lad!


I am Kirk Johnson
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"William Sommerwerck" wrote in
:

"Bert Hyman" wrote in message
...
In "William Sommerwerck"
wrote:

Now when first powered on after an overnight rest, it will shut off
immediately (stays on for maybe 5 seconds). After power cycling
the main switch (can't be done via remote -- must use the switch
on the back), it will run all day without problem.

That might very well be the defining symptom. What is the circuit
difference in the way the unit turns on and off via remote, and by
flipping the switch?

When it's turned off by the switch in the back, it's really off, just as
if you'd pulled the plug.

When you turn it off with the remote, some parts of the set are still
on, at least enough to allow it react to the remote. This means that the
power supply is still doing something, or at least trying to.

Okay, so let's go from there. What is or is not happening when the remote
control is used that causes the near-instant shutoff, that is not or is
happening when the main power switch is cycled?




I'd suspect caps in the housekeeping supply for the switcher IC/circuit.

--
Jim Yanik
jyanik
at
kua.net

DaveC wrote in
obal.net:

Were any of the caps bulging? Perhaps electrolytic spilled on the
circuit traces causing a sneak path?

No spilled caps. Just low measurement on ESR meter.

Low ESR is -good- for an electrolytic cap.

--
Jim Yanik
jyanik
at
kua.net

On May 3, 6:36*pm, "Dirt Johnson" wrote:
"DaveC" wrote in message

obal.net...





Pioneer plasma model PDP-V401. Original symptom: shut off after seconds or
minutes or hours of operation. Power LED blinked error code 6 (as best I
can
determine the meaning of this code from Googling (I have no manual) this
means PS fault).

Replaced 16 electrolytic caps in the main PS that measured high ESR.

Now when first powered on after an overnight rest, it will shut off
immediately (stays on for maybe 5 seconds). After power cycling the main
switch (can't be done via remote -- must use the switch on the back), it
will
run all day without problem.

All PS voltages are OK (factory sticker inside lists them); all are a few
tenths high (ie, 5v = 5.04).

What next step would you take in troubleshooting this PS?

Thanks.
--
DaveC

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Please reply in the news group

Stick it in the vise lad!

I am Kirk Johnson
"Anal Stretching Specialist"http://www.imagefap.com/image.php?id=1988478267- Hide quoted text -

- Show quoted text -

YOU ARE BY FAR THE WORSE OF THE DIRTY LOW DOWN TROLLS HERE

YOU FAGGOT

YOU NEVER HAVE ANYTHING MANLY OR EVEN ON TOPIC TO CONTRIBUTE TO THIS
GROUP
YOUR LIVING PRIDE SEEMS TO BE YOUR RANDY PARTIALLY DESTROYED ANUS
STILL SUCKING OFF TEENIES ?

MOVE TO MARS HOMO & GET A LIFE

I AM PROTEUS

Low ESR is -good- for an electrolytic cap.

Uh, right. They were *high* ESR...

Thanks.
--
DaveC

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DaveC wrote:
Low ESR is -good- for an electrolytic cap.

Uh, right. They were *high* ESR...

So, hopefully, you replaced them all...?

--
W
. | ,. w , "Some people are alive only because
\|/ \|/ it is illegal to kill them." Perna condita delenda est
---^----^---------------------------------------------------------------

DaveC wrote in
obal.net:

Low ESR is -good- for an electrolytic cap.

Uh, right. They were *high* ESR...

Thanks.

one other thing may be to measure the actual capacitance of each
electrolytic cap;I've had some that measured much below their nominal
rating.

and if -some- supplies are high,that could show that another one is being
loaded and the PS is driving harder to pull it up,raising the other
supplies in the process. Seen a lot of that in TEK WFM monitors.
--
Jim Yanik
jyanik
at
kua.net

In message .net,
DaveC writes
Now when first powered on after an overnight rest, it will shut off
immediately (stays on for maybe 5 seconds). After power cycling the main
switch (can't be done via remote -- must use the switch on the back), it will
run all day without problem.
You've missed a capacitor or an open circuit resistor in the PSU
primary, specifically in the startup supply that feed an SMPS controller
chip before the main PSU starts.

Check the high value resistors and the low value capacitors (usually
under 100uF) in the primary circuits.

If you feel happy working on energised mains fed equipment then while
the PSU is in the faulting state, check for voltages on the outputs (if
you know the voltages expected then a bunch of LEDs with appropriate
series resistors can be very useful for missing voltage checks)

Power cycle it and then check again.

Bets are that it's not one single PSU, but a couple or more possibly on
the same board. Probably one of them isn't starting up correctly after
being off for a few hours and/or cooling down.

All PS voltages are OK (factory sticker inside lists them); all are a few
tenths high (ie, 5v = 5.04).
That's within 1% and the accuracy of your meter comes into play as well
at that sort of margin, I'd expect the voltages to be +/- a couple of
percent minimum, possibly up to 10% and still be OK so I don't think
there's anything to be concerned about there.

What next step would you take in troubleshooting this PS?
Go back and check the rest of the components one at a time.

Thanks.

--
Clint Sharp

wrote in message
...
On May 3, 6:36 pm, "Dirt Johnson" wrote:
"DaveC" wrote in message

obal.net...





Pioneer plasma model PDP-V401. Original symptom: shut off after seconds
or
minutes or hours of operation. Power LED blinked error code 6 (as best I
can
determine the meaning of this code from Googling (I have no manual) this
means PS fault).

Replaced 16 electrolytic caps in the main PS that measured high ESR.

Now when first powered on after an overnight rest, it will shut off
immediately (stays on for maybe 5 seconds). After power cycling the main
switch (can't be done via remote -- must use the switch on the back), it
will
run all day without problem.

All PS voltages are OK (factory sticker inside lists them); all are a
few
tenths high (ie, 5v = 5.04).

What next step would you take in troubleshooting this PS?

Thanks.
--
DaveC

This is an invalid return address
Please reply in the news group

Stick it in the vise lad!

I am Kirk Johnson
"Anal Stretching
Specialist"http://www.imagefap.com/image.php?id=1988478267- Hide quoted
text -

- Show quoted text -

YOU ARE BY FAR THE WORSE OF THE DIRTY LOW DOWN TROLLS HERE

YOU FAGGOT

YOU NEVER HAVE ANYTHING MANLY OR EVEN ON TOPIC TO CONTRIBUTE TO THIS
GROUP
YOUR LIVING PRIDE SEEMS TO BE YOUR RANDY PARTIALLY DESTROYED ANUS
STILL SUCKING OFF TEENIES ?

MOVE TO MARS HOMO & GET A LIFE

I AM PROTEUS


Stretch me out lad!

I Am Kirk Johnson
"Anal Expander"

On May 6, 3:16*am, "Kirk John's Son" wrote:
wrote in message

...
On May 3, 6:36 pm, "Dirt Johnson" wrote:





"DaveC" wrote in message

lobal.net...

Pioneer plasma model PDP-V401. Original symptom: shut off after seconds
or
minutes or hours of operation. Power LED blinked error code 6 (as best I
can
determine the meaning of this code from Googling (I have no manual) this
means PS fault).

Replaced 16 electrolytic caps in the main PS that measured high ESR.

Now when first powered on after an overnight rest, it will shut off
immediately (stays on for maybe 5 seconds). After power cycling the main
switch (can't be done via remote -- must use the switch on the back), it
will
run all day without problem.

All PS voltages are OK (factory sticker inside lists them); all are a
few
tenths high (ie, 5v = 5.04).

What next step would you take in troubleshooting this PS?

Thanks.
--
DaveC

This is an invalid return address
Please reply in the news group

Stick it in the vise lad!

I am Kirk Johnson
"Anal Stretching
Specialist"http://www.imagefap.com/image.php?id=1988478267-Hide quoted
text -

- Show quoted text -

YOU ARE BY FAR THE WORSE OF THE DIRTY LOW DOWN *TROLLS HERE

YOU FAGGOT

YOU NEVER HAVE ANYTHING MANLY OR EVEN ON TOPIC TO CONTRIBUTE TO THIS
GROUP
YOUR LIVING PRIDE SEEMS TO BE YOUR RANDY PARTIALLY DESTROYED ANUS
STILL SUCKING OFF TEENIES ?

MOVE TO MARS HOMO & GET A LIFE

I AM PROTEUS

Stretch me out lad!

I Am Kirk Johnson
"Anal Expander"- Hide quoted text -

- Show quoted text -

YOU ARE DONE

I AM PROTEUS