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

Er, make that "all are a few hundredths high"...
--
DaveC

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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?

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.

--
Bert Hyman St. Paul, MN

"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?

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 presume that when the remote is used, some monitoring circuit detects an
out-of-spec PS voltage immediately after power-on. Using the mains switch
removes power from even the monitor circuits and clears the error code.
--
DaveC

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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 presume that when the remote is used, some monitoring circuit
detects an out-of-spec PS voltage immediately after power-on. Using
the mains switch removes power from even the monitor circuits and
clears the error code.

That's plausible. So how would you troubleshoot that?

Next question -- Assuming this analysis is correct, why does the presumed
out-of-spec voltage -- or its detection -- NOT occur when there's a "hard"
power cycling?

"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

On Sun, 3 May 2009 08:03:17 -0700, "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?


One is a start up from a sleep mode, and the other is a hard power
switch.

This is a common sense prediction. You can bet that the remote operates
a relay though.

DaveC wrote:
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?

Not really my area of expertise, but you've obviously got a cold fault.
Maybe the inrush-limiting thermister?

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

On Sun, 3 May 2009 07:32:08 -0700, DaveC wrote:

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.


Check the feed ins to the main controller board. Some watchdog is not
getting the same rail voltage you are reading at the PS.

So, even though your PS is good, it is not making it into the board
correctly.

DaveC wrote:
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.


What's happening to the power supply voltages when it shuts down? Are
there any error codes or does it just turn off? Once it's on and
running, can you turn it off then back on with the remote?

I've seen a very similar problem with an old PC power supply that had
some bad capacitors, could you have additional bad caps? I've had a few
cases where a capacitor was in parallel with something else that caused
the ESR meter to read good even when the cap was bad.

It may also be a thermal problem as someone else suggested, freeze spray
is handy for this sort of thing, you can also use a can of that air
duster stuff held upside down.

What's happening to the power supply voltages when it shuts down? Are
there any error codes or does it just turn off? Once it's on and
running, can you turn it off then back on with the remote?

First time (ie, in the morning) it is turned on, it turns off after 5
seconds. "PD" (auto Power Down) LED lights on PS pcb. Power LED (on front
panel) flashes error code = 6. (A TV tech I e-mailed with says this is
frequently a PS failure code for Pioneer, but he does't have the exact
service manual for this model (PDP-V401) so cannot confirm.)

During error condition, must use mains switch to power off (which clears
error condition) and back on. Remote is ineffective while error condition
exists.

Once this is done, can then use remote to power it on and off all day. No
issues. Only after sitting off overnight will error condition occur again.

Do not know what voltages are doing when error condition occurs. I will guess
that they are OK, because I get a normal picture on the screen. It's a bit
time-consuming to do these V checks; I can only get an error condition once a
day ( x 5 voltages...)

Thanks.
--
DaveC

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Please reply in the news group

DaveC wrote:

What's happening to the power supply voltages when it shuts down? Are
there any error codes or does it just turn off? Once it's on and
running, can you turn it off then back on with the remote?


First time (ie, in the morning) it is turned on, it turns off after 5
seconds. "PD" (auto Power Down) LED lights on PS pcb. Power LED (on front
panel) flashes error code = 6. (A TV tech I e-mailed with says this is
frequently a PS failure code for Pioneer, but he does't have the exact
service manual for this model (PDP-V401) so cannot confirm.)

During error condition, must use mains switch to power off (which clears
error condition) and back on. Remote is ineffective while error condition
exists.

Once this is done, can then use remote to power it on and off all day. No
issues. Only after sitting off overnight will error condition occur again.

Do not know what voltages are doing when error condition occurs. I will guess
that they are OK, because I get a normal picture on the screen. It's a bit
time-consuming to do these V checks; I can only get an error condition once a
day ( x 5 voltages...)

Thanks.
Sounds like a bad cap in the delay timing circuit that detects valleys
in the voltage/Peaks in surge currents.
This normally shuts down the unit in the event of a voltage sage due
to an excessive unexpected load on the PS.

This problem would also cause it not to start properly if the main
caps are totally discharged and there for, is taking to long on the start
to charge them for what the current existing delay is at due to a faulty
cap in the delay protection circuit.

This cap is normally a small type. You may want to look into that.

It's a common problem is power supply protection in many of designs..


http://webpages.charter.net/jamie_5"

Sounds like a bad cap in the delay timing circuit that detects valleys
in the voltage/Peaks in surge currents.
This normally shuts down the unit in the event of a voltage sage due
to an excessive unexpected load on the PS.

This problem would also cause it not to start properly if the main
caps are totally discharged and there for, is taking to long on the start
to charge them for what the current existing delay is at due to a faulty
cap in the delay protection circuit.

-=-=-=-

Turn-off after 5 seconds is a bit long for a surge or slow cap-charge error,
isn't it?

This cap is normally a small type. You may want to look into that.

Without wiring diagrams, how would one go about locating such a cap?
--
DaveC

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DaveC wrote:
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.

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

--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Use only Genuine Interocitor Parts" Tom Servo ;-P

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.
--
DaveC

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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

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

"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

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

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

wrote in message
...
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 LIMPDICK

It'll stretch a yard before it tears a inch lad

I am Kirk Johnson.

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