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

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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Please reply in the news group

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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Please reply in the news group

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
---^----^---------------------------------------------------------------

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?

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?

There's a few connectors on the PS pcb that look like they be monitor and/or
control signals. I'll scope them and see what they do (tomorrow morning --
the next possible time for an error-inducing "cold" turn-on).

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?

I'm not sure it's due to a difference between the two power-on techniques. I
think it's just the fact that it is power cycled, period. Since the remote
control circuitry will not allow a power cycle until the error condition has
been cleared, the only way to power cycle is to use the mains switch. If
successive power-cycling were possible via the remote control, I think the
unit would power up and stay powered on. And I would not be asking for help.
If the only problem with the unit was that every time you turned it on for
the first time in the day you had to push the remote Power button twice, well
that would be a great day.

Also, I scoped the PS voltages.

http://i44.tinypic.com/rtzuyo.jpg

Is 0.5v noise excessive? Shown is 5v supply measured at test pin on PS pcb.
Others have similar noise except 139v: 12v (0.5v noise), 60v (0.5v noise),
139v (5.0v noise) 170v (0.5v noise).

I appreciate your thought-provoking questions.
--
DaveC

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On Sun, 3 May 2009 09:45:24 -0700, "William Sommerwerck"
wrote:

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?

It is part of a start up routine initiated by the remote cycling?

DaveC wrote:


Also, I scoped the PS voltages.

http://i44.tinypic.com/rtzuyo.jpg

Is 0.5v noise excessive? Shown is 5v supply measured at test pin on PS pcb.

I'd get friendly with some Pioneer tech support types and secure
a schematic.

Others have similar noise except 139v: 12v (0.5v noise), 60v (0.5v noise),
139v (5.0v noise) 170v (0.5v noise).

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.

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?

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.

DaveC wrote:


Also, I scoped the PS voltages.
http://i44.tinypic.com/rtzuyo.jpg

Is 0.5v noise excessive? Shown is 5v supply measured at test pin on PS
pcb.

I'd get friendly with some Pioneer tech support types and secure a
schematic.

Others have similar noise except 139v: 12v (0.5v noise), 60v (0.5v
noise), 139v (5.0v noise) 170v (0.5v noise).



Whoops. The same noise on all but one supply sounds like a
reference problem. Are you grounding your probe? This is where a
schematic becomes invaluable.

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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Please reply in the news group

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 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

"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

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

Low ESR is -good- for an electrolytic cap.

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

Thanks.
--
DaveC

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Please reply in the news group

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

Hey Dave, i've been trying to fix a hitachi 50" plasma with no VS and
Va (No pic audio works fine though). Initially i thought the power
supply was bust, i googled Vcago and Vcego on a hunch ( 2 pins on a
connector coming from logic pcb) and that led me to
http://www.justanswer.com/questions/...plasma-tv-main
This guy, John, seems to have a lot of experience on plasmas. Maybe
you could post one in there and see what he says.
Turned out that a blown panel driver on my Hitachi lower Y-buffer pcb
was ordering logic to shut down panel supplies in ps.
Jango

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 case you haven't noticed it, at
http://www.tradebit.com/filedetail.p...-v401e-plasma-
display
there is an offer of a manual for this thing for sale, $7.50.

Thanks for the pointer. But this is just a "technical manual", not service
(ie, repair) manual. Contains installation (including mounting on a stand),
picture adjustments, etc.. Nothing re. module or component troubleshooting.

This site is not alone; most of the sites with plasma manuals have this one,
and they all describe is as "service manual". I ask for a peek at the table
of contents before paying, and so far have come up with no service manual.

Thanks for the other ideas. I'll see how they pan out.
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DaveC

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Hey Dave, i've been trying to fix a hitachi 50" plasma with no VS and
Va (No pic audio works fine though). Initially i thought the power
supply was bust, i googled Vcago and Vcego on a hunch ( 2 pins on a
connector coming from logic pcb) and that led me to
http://www.justanswer.com/questions/...plasma-tv-main
This guy, John, seems to have a lot of experience on plasmas. Maybe
you could post one in there and see what he says.
Turned out that a blown panel driver on my Hitachi lower Y-buffer pcb
was ordering logic to shut down panel supplies in ps.
Jango

Thanks, Jango. I'll check it out.
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DaveC

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On Sat, 9 May 2009 22:50:11 -0700, DaveC put
finger to keyboard and composed:

In case you haven't noticed it, at
http://www.tradebit.com/filedetail.p...-v401e-plasma-
display
there is an offer of a manual for this thing for sale, $7.50.

Thanks for the pointer. But this is just a "technical manual", not service
(ie, repair) manual. Contains installation (including mounting on a stand),
picture adjustments, etc.. Nothing re. module or component troubleshooting.

This site is not alone; most of the sites with plasma manuals have this one,
and they all describe is as "service manual". I ask for a peek at the table
of contents before paying, and so far have come up with no service manual.

Thanks for the other ideas. I'll see how they pan out.

The manual you have is probably this one:
http://www.pioneerelectronics.com/pi...V401_tm_V2.PDF

FWIW, Pioneer's part number for that manual appears to be ARP2981.

Here is a collection of Pioneer service notes:
http://getmanual.ru/tv/sb/pioneer.pdf

I suspect that you may have a power sequencing issue.

FWIW, here is an ECO (Jan 25, 2001) that describes such an issue (page
227).

================================================== ================
SYMPTOM 1 PDP repeats turning on and off.

CAUSE 1 Power circuit will be reset because the secondary circuit
rarely works before the primary circuit works normally when the power
turns on.

SERVICE Change of two resistors in Main Power Assy; AWR1077.

Ref CURRENT PARTS CO NEW PARTS
* # SYMBOL/DESCRIPTION PART NUMBER DE PART NUMBER SYMBOL/DESCRIPTION
A 1 R3107 RD1/2PM473J RD1PM153J R3107
A 1 R3108 RD1/2PM563J RD1PM153J
================================================== ================

It appears that the above ECO calls for changing R3107 from 47K 1/2W
to 15K 1W, and R3108 from 56K 1/2W to 15K 1W.

FWIW, the service manual for the PDP-502MX has a section (page 58)
that talks about power sequencing:
http://www.go-gddq.com/upload/2009_0...2211238438.pdf

- Franc Zabkar
--
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I suspect that you may have a power sequencing issue.

Hi Franc,
Yes I have the technical manual which, sadly, is not the service manual. And
regarding the ECO describing the 2 resistors, I've changed them. No joy.

The 502MX manual does have a section on power sequencing that is very good.
If I had such a description for this monitor (V401) I'd have known long ago
what the problem was, exactly.

Thanks,
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DaveC

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