Sorry if this is a bit of a novice question...

I have a SMPS in Plsama tv which upon powering up starts clicking... It
seems to do it as it warms up or the load changes on the psu (screen going
dark or getting light)

As far as I can tell it isnt any relay doing this, even though It sounds
like a relay.

Ticking alone I could live with, although a bit annoying but the PSU also
occasionally shuts down when cold. I am not 100% sure what is clicking.. The
clicking noise seems to be coming from different locations at dfferent
times, even possibly the X or Y sus boards.

I have sprayed the whole thing down with freeze spray to no avail... It is
built with PBF solder, so I guess bad solder joints are likely issue also.

I have changed the obvious capacitors near heat sources excpet the two large
400v 250uf filter caps.. Removed and checked the filter caps and they
checked good on my ESR meter.

Any Idea what would be clikcing? Here is the board layout
https://sites.google.com/site/chibamikey/PSU.JPG

"Michael Kennedy" mike@com wrote in message
...
Sorry if this is a bit of a novice question...

I have a SMPS in Plsama tv which upon powering up starts clicking... It
seems to do it as it warms up or the load changes on the psu (screen going
dark or getting light)

As far as I can tell it isnt any relay doing this, even though It sounds
like a relay.

Ticking alone I could live with, although a bit annoying but the PSU also
occasionally shuts down when cold. I am not 100% sure what is clicking..
The clicking noise seems to be coming from different locations at dfferent
times, even possibly the X or Y sus boards.

I have sprayed the whole thing down with freeze spray to no avail... It is
built with PBF solder, so I guess bad solder joints are likely issue also.

I have changed the obvious capacitors near heat sources excpet the two
large 400v 250uf filter caps.. Removed and checked the filter caps and
they checked good on my ESR meter.

Any Idea what would be clikcing? Here is the board layout
https://sites.google.com/site/chibamikey/PSU.JPG



I have seen similar issues on Samsung plasmas resulting from bad solder
connections at some switching transistors near the middle of the board. The
eyelets are too small and need to be scraped a bit to enlarge them before
resoldering. The board does look similar to yours. Maybe you'll get lucky.
If not solder connections in there somewhere, failing capacitors would be
the likely culprit, although this problem has been much more common on LCD
sets. Plasmas I've seen don't seem to use the really cheap caps.

Mark Z.

"Mark Zacharias" wrote in message
b.com...
"Michael Kennedy" mike@com wrote in message
...
Sorry if this is a bit of a novice question...

I have a SMPS in Plsama tv which upon powering up starts clicking... It
seems to do it as it warms up or the load changes on the psu (screen
going dark or getting light)

As far as I can tell it isnt any relay doing this, even though It sounds
like a relay.

Ticking alone I could live with, although a bit annoying but the PSU also
occasionally shuts down when cold. I am not 100% sure what is clicking..
The clicking noise seems to be coming from different locations at
dfferent times, even possibly the X or Y sus boards.

I have sprayed the whole thing down with freeze spray to no avail... It
is built with PBF solder, so I guess bad solder joints are likely issue
also.

I have changed the obvious capacitors near heat sources excpet the two
large 400v 250uf filter caps.. Removed and checked the filter caps and
they checked good on my ESR meter.

Any Idea what would be clikcing? Here is the board layout
https://sites.google.com/site/chibamikey/PSU.JPG



I have seen similar issues on Samsung plasmas resulting from bad solder
connections at some switching transistors near the middle of the board.
The eyelets are too small and need to be scraped a bit to enlarge them
before resoldering. The board does look similar to yours. Maybe you'll get
lucky.
If not solder connections in there somewhere, failing capacitors would be
the likely culprit, although this problem has been much more common on LCD
sets. Plasmas I've seen don't seem to use the really cheap caps.

Mark Z.


Thanks you suggested that before.. I will get a closer look at the
transistors and check out those eyelits.. I havent doent that yet, and
probably would have forgot had you not replied.



About the ticking.. It doesn't stop even with the power removed. It is
almost if something is expanding and contracting, but makes the sound
equilivant of a relay?!

The really strange part is it doesn't seem to come from one consistant
place..

On Thu, 7 Oct 2010 23:49:25 +0900, "Michael Kennedy"
wrote:


"Mark Zacharias" wrote in message
eb.com...
"Michael Kennedy" mike@com wrote in message
...
Sorry if this is a bit of a novice question...

I have a SMPS in Plsama tv which upon powering up starts clicking... It
seems to do it as it warms up or the load changes on the psu (screen
going dark or getting light)

As far as I can tell it isnt any relay doing this, even though It sounds
like a relay.

Ticking alone I could live with, although a bit annoying but the PSU also
occasionally shuts down when cold. I am not 100% sure what is clicking..
The clicking noise seems to be coming from different locations at
dfferent times, even possibly the X or Y sus boards.

I have sprayed the whole thing down with freeze spray to no avail... It
is built with PBF solder, so I guess bad solder joints are likely issue
also.

I have changed the obvious capacitors near heat sources excpet the two
large 400v 250uf filter caps.. Removed and checked the filter caps and
they checked good on my ESR meter.

Any Idea what would be clikcing? Here is the board layout
https://sites.google.com/site/chibamikey/PSU.JPG



I have seen similar issues on Samsung plasmas resulting from bad solder
connections at some switching transistors near the middle of the board.
The eyelets are too small and need to be scraped a bit to enlarge them
before resoldering. The board does look similar to yours. Maybe you'll get
lucky.
If not solder connections in there somewhere, failing capacitors would be
the likely culprit, although this problem has been much more common on LCD
sets. Plasmas I've seen don't seem to use the really cheap caps.

Mark Z.


Thanks you suggested that before.. I will get a closer look at the
transistors and check out those eyelits.. I havent doent that yet, and
probably would have forgot had you not replied.



About the ticking.. It doesn't stop even with the power removed. It is
almost if something is expanding and contracting, but makes the sound
equilivant of a relay?!

The really strange part is it doesn't seem to come from one consistant
place..

Power removed or TV turned off? If it continues long after the set is
turned off (but still connected to AC power) it is something in the
standby power section of the main power supply.

If it continues for hours after the set is unplugged, it's probably a
cricket.

PlainBill

On 2010-10-07 07:55:49 +0200, "Michael Kennedy" mike@com said:

Sorry if this is a bit of a novice question...

I have a SMPS in Plsama tv which upon powering up starts clicking...
It seems to do it as it warms up or the load changes on the psu (screen
going dark or getting light)

As far as I can tell it isnt any relay doing this, even though It
sounds like a relay.

Ticking alone I could live with, although a bit annoying but the PSU
also occasionally shuts down when cold. I am not 100% sure what is
clicking.. The clicking noise seems to be coming from different
locations at dfferent times, even possibly the X or Y sus boards.

I have sprayed the whole thing down with freeze spray to no avail... It
is built with PBF solder, so I guess bad solder joints are likely issue
also.

I have changed the obvious capacitors near heat sources excpet the two
large 400v 250uf filter caps.. Removed and checked the filter caps and
they checked good on my ESR meter.

Any Idea what would be clikcing? Here is the board layout
https://sites.google.com/site/chibamikey/PSU.JPG

I would change the main 400v capacitor
clicks means this capacitor is almost dry ...
regards,
--
-
Jean-Yves

Its got to stop sometime after its been unplugged. I do not think there are
any relays in todays plasma power boards, so the ticking is likely coming
from a transformer. Its a ' special effect ' that happens when the power
supply is loaded down somewhere, usually on one of the main DC outputs. The
overload condition triggers an imbalance in the feedback circuirty, and the
power supply cannot sustain itself with this condition present. You may want
to check the temperature of the big heat sinks on the X-sus board at the
peak of the problem, could be they are very hot.

About the ticking.. It doesn't stop even with the power removed. It is
almost if something is expanding and contracting, but makes the sound
equilivant of a relay?!

The really strange part is it doesn't seem to come from one consistant
place..

wrote in message
...
On Thu, 7 Oct 2010 23:49:25 +0900, "Michael Kennedy"
wrote:


"Mark Zacharias" wrote in message
web.com...
"Michael Kennedy" mike@com wrote in message
...
Sorry if this is a bit of a novice question...

I have a SMPS in Plsama tv which upon powering up starts clicking...
It
seems to do it as it warms up or the load changes on the psu (screen
going dark or getting light)

As far as I can tell it isnt any relay doing this, even though It
sounds
like a relay.

Ticking alone I could live with, although a bit annoying but the PSU
also
occasionally shuts down when cold. I am not 100% sure what is
clicking..
The clicking noise seems to be coming from different locations at
dfferent times, even possibly the X or Y sus boards.

I have sprayed the whole thing down with freeze spray to no avail... It
is built with PBF solder, so I guess bad solder joints are likely issue
also.

I have changed the obvious capacitors near heat sources excpet the two
large 400v 250uf filter caps.. Removed and checked the filter caps and
they checked good on my ESR meter.

Any Idea what would be clikcing? Here is the board layout
https://sites.google.com/site/chibamikey/PSU.JPG



I have seen similar issues on Samsung plasmas resulting from bad solder
connections at some switching transistors near the middle of the board.
The eyelets are too small and need to be scraped a bit to enlarge them
before resoldering. The board does look similar to yours. Maybe you'll
get
lucky.
If not solder connections in there somewhere, failing capacitors would
be
the likely culprit, although this problem has been much more common on
LCD
sets. Plasmas I've seen don't seem to use the really cheap caps.

Mark Z.


Thanks you suggested that before.. I will get a closer look at the
transistors and check out those eyelits.. I havent doent that yet, and
probably would have forgot had you not replied.



About the ticking.. It doesn't stop even with the power removed. It is
almost if something is expanding and contracting, but makes the sound
equilivant of a relay?!

The really strange part is it doesn't seem to come from one consistant
place..

Power removed or TV turned off? If it continues long after the set is
turned off (but still connected to AC power) it is something in the
standby power section of the main power supply.

If it continues for hours after the set is unplugged, it's probably a
cricket.

PlainBill


No its not hours, but at least 3 or 4 minutes.. Sounds like a realy clicking
sometimes.. Other times not so loud.. Makes me think of expanding and
contracting metal, although I cant see how that is possible given the low
tempatures.

"Michael Kennedy" mike@com wrote in message
...

wrote in message
...
On Thu, 7 Oct 2010 23:49:25 +0900, "Michael Kennedy"
wrote:


"Mark Zacharias" wrote in message
aweb.com...
"Michael Kennedy" mike@com wrote in message
...
Sorry if this is a bit of a novice question...

I have a SMPS in Plsama tv which upon powering up starts clicking...
It
seems to do it as it warms up or the load changes on the psu (screen
going dark or getting light)

As far as I can tell it isnt any relay doing this, even though It
sounds
like a relay.

Ticking alone I could live with, although a bit annoying but the PSU
also
occasionally shuts down when cold. I am not 100% sure what is
clicking..
The clicking noise seems to be coming from different locations at
dfferent times, even possibly the X or Y sus boards.

I have sprayed the whole thing down with freeze spray to no avail...
It
is built with PBF solder, so I guess bad solder joints are likely
issue
also.

I have changed the obvious capacitors near heat sources excpet the two
large 400v 250uf filter caps.. Removed and checked the filter caps and
they checked good on my ESR meter.

Any Idea what would be clikcing? Here is the board layout
https://sites.google.com/site/chibamikey/PSU.JPG



I have seen similar issues on Samsung plasmas resulting from bad solder
connections at some switching transistors near the middle of the board.
The eyelets are too small and need to be scraped a bit to enlarge them
before resoldering. The board does look similar to yours. Maybe you'll
get
lucky.
If not solder connections in there somewhere, failing capacitors would
be
the likely culprit, although this problem has been much more common on
LCD
sets. Plasmas I've seen don't seem to use the really cheap caps.

Mark Z.


Thanks you suggested that before.. I will get a closer look at the
transistors and check out those eyelits.. I havent doent that yet, and
probably would have forgot had you not replied.



About the ticking.. It doesn't stop even with the power removed. It is
almost if something is expanding and contracting, but makes the sound
equilivant of a relay?!

The really strange part is it doesn't seem to come from one consistant
place..

Power removed or TV turned off? If it continues long after the set is
turned off (but still connected to AC power) it is something in the
standby power section of the main power supply.

If it continues for hours after the set is unplugged, it's probably a
cricket.

PlainBill


No its not hours, but at least 3 or 4 minutes.. Sounds like a realy
clicking sometimes.. Other times not so loud.. Makes me think of expanding
and contracting metal, although I cant see how that is possible given the
low tempatures.

Hope it isn't the PDP. I've read horror stories about those expanding and
contracting (they do get VERY hot), and finally cracking.

wrote in message
...
On Thu, 7 Oct 2010 23:49:25 +0900, "Michael Kennedy"
wrote:


"Mark Zacharias" wrote in message
eb.com...
"Michael Kennedy" mike@com wrote in message
...
Sorry if this is a bit of a novice question...

I have a SMPS in Plsama tv which upon powering up starts clicking...
It
seems to do it as it warms up or the load changes on the psu (screen
going dark or getting light)

As far as I can tell it isnt any relay doing this, even though It
sounds
like a relay.

Ticking alone I could live with, although a bit annoying but the PSU
also
occasionally shuts down when cold. I am not 100% sure what is
clicking..
The clicking noise seems to be coming from different locations at
dfferent times, even possibly the X or Y sus boards.

I have sprayed the whole thing down with freeze spray to no avail...
It
is built with PBF solder, so I guess bad solder joints are likely
issue
also.

I have changed the obvious capacitors near heat sources excpet the two
large 400v 250uf filter caps.. Removed and checked the filter caps and
they checked good on my ESR meter.

Any Idea what would be clikcing? Here is the board layout
https://sites.google.com/site/chibamikey/PSU.JPG



I have seen similar issues on Samsung plasmas resulting from bad solder
connections at some switching transistors near the middle of the board.
The eyelets are too small and need to be scraped a bit to enlarge them
before resoldering. The board does look similar to yours. Maybe you'll
get
lucky.
If not solder connections in there somewhere, failing capacitors would
be
the likely culprit, although this problem has been much more common on
LCD
sets. Plasmas I've seen don't seem to use the really cheap caps.

Mark Z.


Thanks you suggested that before.. I will get a closer look at the
transistors and check out those eyelits.. I havent doent that yet, and
probably would have forgot had you not replied.



About the ticking.. It doesn't stop even with the power removed. It is
almost if something is expanding and contracting, but makes the sound
equilivant of a relay?!

The really strange part is it doesn't seem to come from one consistant
place..


Power removed or TV turned off? If it continues long after the set is
turned off (but still connected to AC power) it is something in the
standby power section of the main power supply.

If it continues for hours after the set is unplugged, it's probably a
cricket.

PlainBill


In the UK there is some bug that clicks , regular clicks when active, but
not continuously, comes and goes at random. If , when it is in tapping mood,
you tap near wherever it is hiding, it stops abrubtly, presumably thinking
its found a mate. Not death-watch beatle as not in timber

wrote in
:

On Thu, 7 Oct 2010 23:49:25 +0900, "Michael Kennedy"
wrote:


"Mark Zacharias" wrote in message
web.com...
"Michael Kennedy" mike@com wrote in message
...
Sorry if this is a bit of a novice question...

I have a SMPS in Plsama tv which upon powering up starts
clicking... It seems to do it as it warms up or the load changes on
the psu (screen going dark or getting light)

As far as I can tell it isnt any relay doing this, even though It
sounds like a relay.

Ticking alone I could live with, although a bit annoying but the
PSU also occasionally shuts down when cold. I am not 100% sure what
is clicking.. The clicking noise seems to be coming from different
locations at dfferent times, even possibly the X or Y sus boards.

I have sprayed the whole thing down with freeze spray to no
avail... It is built with PBF solder, so I guess bad solder joints
are likely issue also.

I have changed the obvious capacitors near heat sources excpet the
two large 400v 250uf filter caps.. Removed and checked the filter
caps and they checked good on my ESR meter.

Any Idea what would be clikcing? Here is the board layout
https://sites.google.com/site/chibamikey/PSU.JPG



I have seen similar issues on Samsung plasmas resulting from bad
solder connections at some switching transistors near the middle of
the board. The eyelets are too small and need to be scraped a bit to
enlarge them before resoldering. The board does look similar to
yours. Maybe you'll get lucky.
If not solder connections in there somewhere, failing capacitors
would be the likely culprit, although this problem has been much
more common on LCD sets. Plasmas I've seen don't seem to use the
really cheap caps.

Mark Z.


Thanks you suggested that before.. I will get a closer look at the
transistors and check out those eyelits.. I havent doent that yet, and
probably would have forgot had you not replied.



About the ticking.. It doesn't stop even with the power removed. It
is almost if something is expanding and contracting, but makes the
sound equilivant of a relay?!

The really strange part is it doesn't seem to come from one consistant
place..

Power removed or TV turned off? If it continues long after the set is
turned off (but still connected to AC power) it is something in the
standby power section of the main power supply.

If it continues for hours after the set is unplugged, it's probably a
cricket.

PlainBill


the ticking could be the PS current limiting and restarting:I've heard that
in lots of TEKTRONIX switchers. It should only last as long as the charge
in the mains filter caps.

--
Jim Yanik
jyanik
at
localnet
dot com

N_Cook wrote in message
...
wrote in message
...
On Thu, 7 Oct 2010 23:49:25 +0900, "Michael Kennedy"
wrote:


"Mark Zacharias" wrote in message
eb.com...
"Michael Kennedy" mike@com wrote in message
...
Sorry if this is a bit of a novice question...

I have a SMPS in Plsama tv which upon powering up starts
clicking...
It
seems to do it as it warms up or the load changes on the psu (screen
going dark or getting light)

As far as I can tell it isnt any relay doing this, even though It
sounds
like a relay.

Ticking alone I could live with, although a bit annoying but the PSU
also
occasionally shuts down when cold. I am not 100% sure what is
clicking..
The clicking noise seems to be coming from different locations at
dfferent times, even possibly the X or Y sus boards.

I have sprayed the whole thing down with freeze spray to no avail...
It
is built with PBF solder, so I guess bad solder joints are likely
issue
also.

I have changed the obvious capacitors near heat sources excpet the
two
large 400v 250uf filter caps.. Removed and checked the filter caps
and
they checked good on my ESR meter.

Any Idea what would be clikcing? Here is the board layout
https://sites.google.com/site/chibamikey/PSU.JPG



I have seen similar issues on Samsung plasmas resulting from bad
solder
connections at some switching transistors near the middle of the
board.
The eyelets are too small and need to be scraped a bit to enlarge
them
before resoldering. The board does look similar to yours. Maybe
you'll
get
lucky.
If not solder connections in there somewhere, failing capacitors
would
be
the likely culprit, although this problem has been much more common
on
LCD
sets. Plasmas I've seen don't seem to use the really cheap caps.

Mark Z.


Thanks you suggested that before.. I will get a closer look at the
transistors and check out those eyelits.. I havent doent that yet, and
probably would have forgot had you not replied.



About the ticking.. It doesn't stop even with the power removed. It is
almost if something is expanding and contracting, but makes the sound
equilivant of a relay?!

The really strange part is it doesn't seem to come from one consistant
place..


Power removed or TV turned off? If it continues long after the set is
turned off (but still connected to AC power) it is something in the
standby power section of the main power supply.

If it continues for hours after the set is unplugged, it's probably a
cricket.

PlainBill


In the UK there is some bug that clicks , regular clicks when active, but
not continuously, comes and goes at random. If , when it is in tapping
mood,
you tap near wherever it is hiding, it stops abrubtly, presumably thinking
its found a mate. Not death-watch beatle as not in timber



perhaps the insect that does this is called a tick

"jeanyves" wrote in message
...
On 2010-10-07 07:55:49 +0200, "Michael Kennedy" mike@com said:

Sorry if this is a bit of a novice question...

I have a SMPS in Plsama tv which upon powering up starts clicking... It
seems to do it as it warms up or the load changes on the psu (screen
going dark or getting light)

As far as I can tell it isnt any relay doing this, even though It sounds
like a relay.

Ticking alone I could live with, although a bit annoying but the PSU also
occasionally shuts down when cold. I am not 100% sure what is clicking..
The clicking noise seems to be coming from different locations at
dfferent times, even possibly the X or Y sus boards.

I have sprayed the whole thing down with freeze spray to no avail... It
is built with PBF solder, so I guess bad solder joints are likely issue
also.

I have changed the obvious capacitors near heat sources excpet the two
large 400v 250uf filter caps.. Removed and checked the filter caps and
they checked good on my ESR meter.

Any Idea what would be clikcing? Here is the board layout
https://sites.google.com/site/chibamikey/PSU.JPG

I would change the main 400v capacitor
clicks means this capacitor is almost dry ...
regards,
--
-
Jean-Yves


Well thats good advice, but it appears that they are good. I checked them
with my esr meter out of circuit and they both have an esr of 0.12 ohms.

On Fri, 08 Oct 2010 07:54:51 -0500, Jim Yanik
wrote:

wrote in
:

On Thu, 7 Oct 2010 23:49:25 +0900, "Michael Kennedy"
wrote:


"Mark Zacharias" wrote in message
aweb.com...
"Michael Kennedy" mike@com wrote in message
...
Sorry if this is a bit of a novice question...

I have a SMPS in Plsama tv which upon powering up starts
clicking... It seems to do it as it warms up or the load changes on
the psu (screen going dark or getting light)

As far as I can tell it isnt any relay doing this, even though It
sounds like a relay.

Ticking alone I could live with, although a bit annoying but the
PSU also occasionally shuts down when cold. I am not 100% sure what
is clicking.. The clicking noise seems to be coming from different
locations at dfferent times, even possibly the X or Y sus boards.

I have sprayed the whole thing down with freeze spray to no
avail... It is built with PBF solder, so I guess bad solder joints
are likely issue also.

I have changed the obvious capacitors near heat sources excpet the
two large 400v 250uf filter caps.. Removed and checked the filter
caps and they checked good on my ESR meter.

Any Idea what would be clikcing? Here is the board layout
https://sites.google.com/site/chibamikey/PSU.JPG



I have seen similar issues on Samsung plasmas resulting from bad
solder connections at some switching transistors near the middle of
the board. The eyelets are too small and need to be scraped a bit to
enlarge them before resoldering. The board does look similar to
yours. Maybe you'll get lucky.
If not solder connections in there somewhere, failing capacitors
would be the likely culprit, although this problem has been much
more common on LCD sets. Plasmas I've seen don't seem to use the
really cheap caps.

Mark Z.


Thanks you suggested that before.. I will get a closer look at the
transistors and check out those eyelits.. I havent doent that yet, and
probably would have forgot had you not replied.



About the ticking.. It doesn't stop even with the power removed. It
is almost if something is expanding and contracting, but makes the
sound equilivant of a relay?!

The really strange part is it doesn't seem to come from one consistant
place..

Power removed or TV turned off? If it continues long after the set is
turned off (but still connected to AC power) it is something in the
standby power section of the main power supply.

If it continues for hours after the set is unplugged, it's probably a
cricket.

PlainBill


the ticking could be the PS current limiting and restarting:I've heard that
in lots of TEKTRONIX switchers. It should only last as long as the charge
in the mains filter caps.
Agreed. The mains filter cap can easily hold a charge for 5 minutes
if there is no load. I have observed an SMPS clicking as it trys to
start, but fails due to a bad Vcc cap (10-47 µF). I am unable to
comprehend a circumstance that would allow that to be the source of
the noise on a functional power supply.

PlainBill

wrote in
:

On Fri, 08 Oct 2010 07:54:51 -0500, Jim Yanik
wrote:

wrote in
m:

On Thu, 7 Oct 2010 23:49:25 +0900, "Michael Kennedy"
wrote:


"Mark Zacharias" wrote in message
raweb.com...
"Michael Kennedy" mike@com wrote in message
...
Sorry if this is a bit of a novice question...

I have a SMPS in Plsama tv which upon powering up starts
clicking... It seems to do it as it warms up or the load changes
on the psu (screen going dark or getting light)

As far as I can tell it isnt any relay doing this, even though It
sounds like a relay.

Ticking alone I could live with, although a bit annoying but the
PSU also occasionally shuts down when cold. I am not 100% sure
what is clicking.. The clicking noise seems to be coming from
different locations at dfferent times, even possibly the X or Y
sus boards.

I have sprayed the whole thing down with freeze spray to no
avail... It is built with PBF solder, so I guess bad solder
joints are likely issue also.

I have changed the obvious capacitors near heat sources excpet
the two large 400v 250uf filter caps.. Removed and checked the
filter caps and they checked good on my ESR meter.

Any Idea what would be clikcing? Here is the board layout
https://sites.google.com/site/chibamikey/PSU.JPG



I have seen similar issues on Samsung plasmas resulting from bad
solder connections at some switching transistors near the middle
of the board. The eyelets are too small and need to be scraped a
bit to enlarge them before resoldering. The board does look
similar to yours. Maybe you'll get lucky.
If not solder connections in there somewhere, failing capacitors
would be the likely culprit, although this problem has been much
more common on LCD sets. Plasmas I've seen don't seem to use the
really cheap caps.

Mark Z.


Thanks you suggested that before.. I will get a closer look at the
transistors and check out those eyelits.. I havent doent that yet,
and probably would have forgot had you not replied.



About the ticking.. It doesn't stop even with the power removed. It
is almost if something is expanding and contracting, but makes the
sound equilivant of a relay?!

The really strange part is it doesn't seem to come from one
consistant place..

Power removed or TV turned off? If it continues long after the set
is turned off (but still connected to AC power) it is something in
the standby power section of the main power supply.

If it continues for hours after the set is unplugged, it's probably
a cricket.

PlainBill


the ticking could be the PS current limiting and restarting:I've heard
that in lots of TEKTRONIX switchers. It should only last as long as
the charge in the mains filter caps.
Agreed. The mains filter cap can easily hold a charge for 5 minutes
if there is no load. I have observed an SMPS clicking as it trys to
start, but fails due to a bad Vcc cap (10-47 µF). I am unable to
comprehend a circumstance that would allow that to be the source of
the noise on a functional power supply.

PlainBill


some cap or caps(electrolytics,usually) may be marginal,and adding up to
right near the current limit point,or maybe a resistor divider that sets
the reference for that limit has changed value. any condition that draws
extra power from the supply causes it to go into current limit.

it sure sounds like a cap problem.

--
Jim Yanik
jyanik
at
localnet
dot com

"Jim Yanik" wrote in message
4...
wrote in
:

On Fri, 08 Oct 2010 07:54:51 -0500, Jim Yanik
wrote:

wrote in
:

On Thu, 7 Oct 2010 23:49:25 +0900, "Michael Kennedy"
wrote:


"Mark Zacharias" wrote in message
traweb.com...
"Michael Kennedy" mike@com wrote in message
...
Sorry if this is a bit of a novice question...

I have a SMPS in Plsama tv which upon powering up starts
clicking... It seems to do it as it warms up or the load changes
on the psu (screen going dark or getting light)

As far as I can tell it isnt any relay doing this, even though It
sounds like a relay.

Ticking alone I could live with, although a bit annoying but the
PSU also occasionally shuts down when cold. I am not 100% sure
what is clicking.. The clicking noise seems to be coming from
different locations at dfferent times, even possibly the X or Y
sus boards.

I have sprayed the whole thing down with freeze spray to no
avail... It is built with PBF solder, so I guess bad solder
joints are likely issue also.

I have changed the obvious capacitors near heat sources excpet
the two large 400v 250uf filter caps.. Removed and checked the
filter caps and they checked good on my ESR meter.

Any Idea what would be clikcing? Here is the board layout
https://sites.google.com/site/chibamikey/PSU.JPG



I have seen similar issues on Samsung plasmas resulting from bad
solder connections at some switching transistors near the middle
of the board. The eyelets are too small and need to be scraped a
bit to enlarge them before resoldering. The board does look
similar to yours. Maybe you'll get lucky.
If not solder connections in there somewhere, failing capacitors
would be the likely culprit, although this problem has been much
more common on LCD sets. Plasmas I've seen don't seem to use the
really cheap caps.

Mark Z.


Thanks you suggested that before.. I will get a closer look at the
transistors and check out those eyelits.. I havent doent that yet,
and probably would have forgot had you not replied.



About the ticking.. It doesn't stop even with the power removed. It
is almost if something is expanding and contracting, but makes the
sound equilivant of a relay?!

The really strange part is it doesn't seem to come from one
consistant place..

Power removed or TV turned off? If it continues long after the set
is turned off (but still connected to AC power) it is something in
the standby power section of the main power supply.

If it continues for hours after the set is unplugged, it's probably
a cricket.

PlainBill


the ticking could be the PS current limiting and restarting:I've heard
that in lots of TEKTRONIX switchers. It should only last as long as
the charge in the mains filter caps.
Agreed. The mains filter cap can easily hold a charge for 5 minutes
if there is no load. I have observed an SMPS clicking as it trys to
start, but fails due to a bad Vcc cap (10-47 $B%*(BF). I am unable to
comprehend a circumstance that would allow that to be the source of
the noise on a functional power supply.

PlainBill


some cap or caps(electrolytics,usually) may be marginal,and adding up to
right near the current limit point,or maybe a resistor divider that sets
the reference for that limit has changed value. any condition that draws
extra power from the supply causes it to go into current limit.

it sure sounds like a cap problem.

--
Jim Yanik
jyanik
at
localnet
dot com


Thanks, Im going to give this another once over again and check any caps
possibly overlooked. I reflowed a lot of marginal looking soler joints. But
this being PBF construction they all look marginal.. Have been removing the
bad solder and replacing with standard solder.


Someone else suggested that the problem may lay in the x or y sus boards.
The y sus board's heat sink gets much hotter than the x sus even though the
contrustion between the two is very similar. It is hot enough that it is
uncomfortable to hold your hand on.

So maybe the noise I hear is the PSU current limiting and the cause is the
y sus board sucking too much juce...

It had some very small capacitors which were possibly bad. I forget their
value, but were in the 6 ohm range when tested with my esr meter, althouh
unphased by freezer spray.

"circuit" wrote in message
...
Its got to stop sometime after its been unplugged. I do not think there
are any relays in todays plasma power boards, so the ticking is likely
coming from a transformer. Its a ' special effect ' that happens when the
power supply is loaded down somewhere, usually on one of the main DC
outputs. The overload condition triggers an imbalance in the feedback
circuirty, and the power supply cannot sustain itself with this condition
present. You may want to check the temperature of the big heat sinks on
the X-sus board at the peak of the problem, could be they are very hot.



I think you hit the problem dead on. The Y sus board is getting quite hot
but the x sus isnt. Any idea what would cause the board to consume more
wattage and therefore get hot?

The components being heat-sinked are probably drawing too much power, either
because they are about to quit and go total short condition, or whatever
they are supplying drive power to is causing them to draw too much power. I
have seen X-sus main output components with the large heat sinks short out,
but so far never the Y-sys. A lot of the time the components being heat
sinked are proprietary, and seem to have these heat sinks sonicly welded to
them permanently. The only way to do a repair is to do a board swap with a
known good board. Good luck.

I think you hit the problem dead on. The Y sus board is getting quite hot
but the x sus isnt. Any idea what would cause the board to consume more
wattage and therefore get hot?

"circuit" wrote in message
...

I think you hit the problem dead on. The Y sus board is getting quite hot
but the x sus isnt. Any idea what would cause the board to consume more
wattage and therefore get hot?

The components being heat-sinked are probably drawing too much power,
either because they are about to quit and go total short condition, or
whatever they are supplying drive power to is causing them to draw too
much power. I have seen X-sus main output components with the large heat
sinks short out, but so far never the Y-sys. A lot of the time the
components being heat sinked are proprietary, and seem to have these heat
sinks sonicly welded to them permanently. The only way to do a repair is
to do a board swap with a known good board. Good luck.


Hmm.. I will have to have a look at the transistors and see if they are
propritary. They are attached by bolts and this board is designed to be
reparied judging by the detail of the service manual.

This tv was quite expensive when new and seems as if built in a different
era.. Say 25 years ago back when thigs were buit with repair in mind. The SM
actually lists individual components and how to troubleshoot them.