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| Science Forum Index » Electronics - Repair Forum » Sony Tv Wont Power Up... |
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Message |
| David B.... |
 Posted: Sat Nov 07, 2009 11:12 am |
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Guest
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I have a sony KV34 HS 510 tv that wont power on . The protector circuit
kicks out and stanby light flashes 7 times.
Does anyone knowwhat would cause the above issue and how I could fix it?
Thanks Dave |
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| b... |
| Posted: Sat Nov 07, 2009 11:12 am |
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Guest
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On 7 nov, 17:12, "David B." <db... at (no spam) glis.net> wrote:stanby light
flashes 7 times.
[quote]Does anyone knowwhat would cause the above issue and how I could fix it?
[/quote]
yeah. it's broken.
seriously now, you will need to get in there and measure a few
voltages , test a few components and at least give us the chassis
reference if you expect any more detailed help than the above!
Flashing LEDs can mean almost anything, from a dry joint to a
transformer failure, and are not a relaible guide. If I were you, I
would take the set to a local repair place and get a quote, based on
proper diagnosis rather than any internet guesswork. The inside of a
TV is no place to be if you have no electroncis experience.
best of luck.
-B |
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| Moi... |
| Posted: Sat Nov 07, 2009 2:19 pm |
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Guest
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[quote]Flashing LEDs can mean almost anything, from a dry joint to a
transformer failure, and are not a relaible guide. If I were you, I
would take the set to a local repair place and get a quote, based on
proper diagnosis rather than any internet guesswork. The inside of a
TV is no place to be if you have no electroncis experience.
[/quote]
And at the very least the diagnosis of a pro will tell you what part needs
replacement and you can then ask us here how involved it might be to DIY.
Heck, someone may also know the particular component on that board that has
failed, based on their history with that model.
good luck! |
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| Mark Zacharias... |
| Posted: Sat Nov 07, 2009 3:48 pm |
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Guest
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"David B." <dbeau at (no spam) glis.net> wrote in message
news:f329b$4af59c68$d8ea78d0$1639 at (no spam) 123.NET...
[quote]I have a sony KV34 HS 510 tv that wont power on . The protector circuit
kicks out and stanby light flashes 7 times.
Does anyone knowwhat would cause the above issue and how I could fix it?
Thanks Dave
[/quote]
Are you a technician?
Mark Z. |
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| Jim Yanik... |
| Posted: Sat Nov 07, 2009 5:21 pm |
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Guest
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"David B." <dbeau at (no spam) glis.net> wrote in
news:f329b$4af59c68$d8ea78d0$1639 at (no spam) 123.NET:
[quote]I have a sony KV34 HS 510 tv that wont power on . The protector circuit
kicks out and stanby light flashes 7 times.
Does anyone knowwhat would cause the above issue and how I could fix it?
Thanks Dave
[/quote]
probably bad electrolytic caps.(ESR)
--
Jim Yanik
jyanik
at
localnet
dot com |
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| David B.... |
| Posted: Sat Nov 07, 2009 7:44 pm |
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Guest
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"Jim Yanik" <jyanik at (no spam) abuse.gov> wrote in message
news:Xns9CBCB08B73C56jyaniklocalnetcom at (no spam) 216.168.3.44...
[quote]"David B." <dbeau at (no spam) glis.net> wrote in
news:f329b$4af59c68$d8ea78d0$1639 at (no spam) 123.NET:
I have a sony KV34 HS 510 tv that wont power on . The protector circuit
kicks out and stanby light flashes 7 times.
Does anyone knowwhat would cause the above issue and how I could fix it?
Thanks Dave
probably bad electrolytic caps.(ESR)
--
Jim Yanik
jyanik
at
localnet
dot com
[/quote]
Thanks for the replies. The tv has a DA-4 chassis. I'm not a tech but have
done some work on guitar tube amps. Tube circuitry is pretty straight
forward makes tracing, reading voltages etc easy work . The only real
trouble shooting I've done on ic's involved switches and solder joints.
Dave |
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| Arfa Daily... |
| Posted: Sat Nov 07, 2009 8:41 pm |
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Guest
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"b" <reverend_rogers at (no spam) yahoo.com> wrote in message
news:2a47cb00-6c48-4f8d-94e4-18c7b532def6 at (no spam) d21g2000yqn.googlegroups.com...
[quote]On 7 nov, 17:12, "David B." <db... at (no spam) glis.net> wrote:stanby light
flashes 7 times.
Does anyone knowwhat would cause the above issue and how I could fix it?
yeah. it's broken.
seriously now, you will need to get in there and measure a few
voltages , test a few components and at least give us the chassis
reference if you expect any more detailed help than the above!
Flashing LEDs can mean almost anything, from a dry joint to a
transformer failure, and are not a relaible guide. If I were you, I
would take the set to a local repair place and get a quote, based on
proper diagnosis rather than any internet guesswork. The inside of a
TV is no place to be if you have no electroncis experience.
best of luck.
-B
[/quote]
With Sony TV sets, the number of times that the LED blinks, is generally a
code to refer you to the faulty area. ISTR that 7 flashes indicates a
horizontal deflection failure, so I guess that the first favourite would
have to be the HOP transistor short circuit, although be aware that there
are issues which can cause transistor failure.
Arfa |
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| Jim Yanik... |
| Posted: Sat Nov 07, 2009 11:17 pm |
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Guest
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"David B." <dbeau at (no spam) glis.net> wrote in
news:a7c2a$4af61490$d8ea65a1$27772 at (no spam) 123.NET:
[quote]
"Jim Yanik" <jyanik at (no spam) abuse.gov> wrote in message
news:Xns9CBCB08B73C56jyaniklocalnetcom at (no spam) 216.168.3.44...
"David B." <dbeau at (no spam) glis.net> wrote in
news:f329b$4af59c68$d8ea78d0$1639 at (no spam) 123.NET:
I have a sony KV34 HS 510 tv that wont power on . The protector
circuit kicks out and stanby light flashes 7 times.
Does anyone knowwhat would cause the above issue and how I could fix
it?
Thanks Dave
probably bad electrolytic caps.(ESR)
--
Jim Yanik
jyanik
at
localnet
dot com
Thanks for the replies. The tv has a DA-4 chassis. I'm not a tech but
have done some work on guitar tube amps. Tube circuitry is pretty
straight forward makes tracing, reading voltages etc easy work . The
only real trouble shooting I've done on ic's involved switches and
solder joints. Dave
[/quote]
modern TVs use high frequency switching power supplies that depend on low-
ESR 105degF electrolytic caps.When the caps ESR climbs,they load supply
lines and eventually,the PS control IC current limits,or goes into "burst"
mode,where it tries to start,current limits,then retries to start
repeatedly.
Sometimes,you get lucky and the bad cap(s) are discolored or swollen,easily
spotted.Other times,you need an ESR meter like the Dick Smith meter.
Now,the bad caps can be on the secondary side,or they can be on the primary
side(or both!),particularly the "housekeeping" supply for the PS controller
IC.
Replacement caps -must- be low-ESR 105DegF,or they don't last very long.
To learn about your TV's power supply,find the power supply control IC(it
will be near the big line-input electrolytic caps,or near a heatsinked
transistor),then Google the datasheet for it.It can tell you a lot.
Sam Goldwasser also has a nice site for troubleshooting.
--
Jim Yanik
jyanik
at
localnet
dot com |
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| Meat Plow... |
| Posted: Sun Nov 08, 2009 7:51 am |
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Guest
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On Sun, 8 Nov 2009 01:41:13 -0000, "Arfa Daily"
<arfa.daily at (no spam) ntlworld.com>wrote:
[quote]
"b" <reverend_rogers at (no spam) yahoo.com> wrote in message
news:2a47cb00-6c48-4f8d-94e4-18c7b532def6 at (no spam) d21g2000yqn.googlegroups.com...
On 7 nov, 17:12, "David B." <db... at (no spam) glis.net> wrote:stanby light
flashes 7 times.
Does anyone knowwhat would cause the above issue and how I could fix it?
yeah. it's broken.
seriously now, you will need to get in there and measure a few
voltages , test a few components and at least give us the chassis
reference if you expect any more detailed help than the above!
Flashing LEDs can mean almost anything, from a dry joint to a
transformer failure, and are not a relaible guide. If I were you, I
would take the set to a local repair place and get a quote, based on
proper diagnosis rather than any internet guesswork. The inside of a
TV is no place to be if you have no electroncis experience.
best of luck.
-B
With Sony TV sets, the number of times that the LED blinks, is generally a
code to refer you to the faulty area. ISTR that 7 flashes indicates a
horizontal deflection failure, so I guess that the first favourite would
have to be the HOP transistor short circuit, although be aware that there
are issues which can cause transistor failure.
[/quote]
Like the driver/driver coupling. |
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| Mark Zacharias... |
| Posted: Sun Nov 08, 2009 9:40 am |
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Guest
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"David B." <dbeau at (no spam) glis.net> wrote in message
news:a7c2a$4af61490$d8ea65a1$27772 at (no spam) 123.NET...
[quote]
"Jim Yanik" <jyanik at (no spam) abuse.gov> wrote in message
news:Xns9CBCB08B73C56jyaniklocalnetcom at (no spam) 216.168.3.44...
"David B." <dbeau at (no spam) glis.net> wrote in
news:f329b$4af59c68$d8ea78d0$1639 at (no spam) 123.NET:
I have a sony KV34 HS 510 tv that wont power on . The protector circuit
kicks out and stanby light flashes 7 times.
Does anyone knowwhat would cause the above issue and how I could fix it?
Thanks Dave
probably bad electrolytic caps.(ESR)
--
Jim Yanik
jyanik
at
localnet
dot com
Thanks for the replies. The tv has a DA-4 chassis. I'm not a tech but have
done some work on guitar tube amps. Tube circuitry is pretty straight
forward makes tracing, reading voltages etc easy work . The only real
trouble shooting I've done on ic's involved switches and solder joints.
Dave
[/quote]
Check the small fusible resistors (0.1 ohm Micron fusible) along the edge of
the power supply / deflection board, about 1/3 of the way from the edge of
the board nearest the front of the set. They are near 1 or 2 larger black
capacitors. Probably the resistors are OK, indicating the FET switchers are
OK.
At this point your most likely culprit is IC 8002, an MCZ3001D or DB.
Replace only with the DB version. This is a common problem.
Mark Z. |
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| Arfa Daily... |
| Posted: Sun Nov 08, 2009 7:55 pm |
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Guest
|
"Meat Plow" <meat at (no spam) petitmorte.net> wrote in message
news:3934cr.df2.17.16 at (no spam) news.alt.net...
[quote]On Sun, 8 Nov 2009 01:41:13 -0000, "Arfa Daily"
arfa.daily at (no spam) ntlworld.com>wrote:
"b" <reverend_rogers at (no spam) yahoo.com> wrote in message
news:2a47cb00-6c48-4f8d-94e4-18c7b532def6 at (no spam) d21g2000yqn.googlegroups.com...
On 7 nov, 17:12, "David B." <db... at (no spam) glis.net> wrote:stanby light
flashes 7 times.
Does anyone knowwhat would cause the above issue and how I could fix
it?
yeah. it's broken.
seriously now, you will need to get in there and measure a few
voltages , test a few components and at least give us the chassis
reference if you expect any more detailed help than the above!
Flashing LEDs can mean almost anything, from a dry joint to a
transformer failure, and are not a relaible guide. If I were you, I
would take the set to a local repair place and get a quote, based on
proper diagnosis rather than any internet guesswork. The inside of a
TV is no place to be if you have no electroncis experience.
best of luck.
-B
With Sony TV sets, the number of times that the LED blinks, is generally a
code to refer you to the faulty area. ISTR that 7 flashes indicates a
horizontal deflection failure, so I guess that the first favourite would
have to be the HOP transistor short circuit, although be aware that there
are issues which can cause transistor failure.
Like the driver/driver coupling.
[/quote]
Yes, quite so. Anything in the base coupling circuit which slows the
transition of the drive waveform will do it. Also bad joints on the driver
transformer when one is used, bad joints on the driver transistor, faulty
flyback tuning caps, faulty HOPTx, and incorrect HT volts to name a few more
common ones.
Arfa |
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| Back to top |
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| Mark Zacharias... |
| Posted: Mon Nov 09, 2009 6:55 am |
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Guest
|
"Arfa Daily" <arfa.daily at (no spam) ntlworld.com> wrote in message
news:QLJJm.146835$R52.67855 at (no spam) newsfe24.ams2...
[quote]
"Meat Plow" <meat at (no spam) petitmorte.net> wrote in message
news:3934cr.df2.17.16 at (no spam) news.alt.net...
On Sun, 8 Nov 2009 01:41:13 -0000, "Arfa Daily"
arfa.daily at (no spam) ntlworld.com>wrote:
"b" <reverend_rogers at (no spam) yahoo.com> wrote in message
news:2a47cb00-6c48-4f8d-94e4-18c7b532def6 at (no spam) d21g2000yqn.googlegroups.com...
On 7 nov, 17:12, "David B." <db... at (no spam) glis.net> wrote:stanby light
flashes 7 times.
Does anyone knowwhat would cause the above issue and how I could fix
it?
yeah. it's broken.
seriously now, you will need to get in there and measure a few
voltages , test a few components and at least give us the chassis
reference if you expect any more detailed help than the above!
Flashing LEDs can mean almost anything, from a dry joint to a
transformer failure, and are not a relaible guide. If I were you, I
would take the set to a local repair place and get a quote, based on
proper diagnosis rather than any internet guesswork. The inside of a
TV is no place to be if you have no electroncis experience.
best of luck.
-B
With Sony TV sets, the number of times that the LED blinks, is generally
a
code to refer you to the faulty area. ISTR that 7 flashes indicates a
horizontal deflection failure, so I guess that the first favourite would
have to be the HOP transistor short circuit, although be aware that there
are issues which can cause transistor failure.
Like the driver/driver coupling.
Yes, quite so. Anything in the base coupling circuit which slows the
transition of the drive waveform will do it. Also bad joints on the driver
transformer when one is used, bad joints on the driver transistor, faulty
flyback tuning caps, faulty HOPTx, and incorrect HT volts to name a few
more common ones.
Arfa
[/quote]
Worked on quite a few of these the past couple years. IC8002 is a frequent
offender. These models are quite different from the standard issue type
we've seen for so many years. I'm actually a relative newbie on TV's, having
been "promoted" to working on them in-shop with the other guys always out on
service calls, but just to give you an idea how different these sets are
from the norm, I can tell you the high voltage is a complete separate
circuit from the 200 volt line. This is because of the different scan rates
supported.
IC8002 provides the PWM drive for the high voltage. IC6501 relates to the
200 volt line. The typical failure mode is that sometimes the set will fire
up just fine, then maybe not for days on end, then mysteriously start
working again, sometimes for up to a couple months.
If the white 0.1 ohm Micron resistors are OK, then IC8002 is by far the most
likely suspect. If the 0.1 resistor associated with that set of FET
switchers is open, then of course those transistors are bad. This seems to
be the case only very rarely, mainly if the flyback(LOPT) goes tango
uniform.
The IC's involved, again are generically known as MCZ3001D and should be
replaced with the newer DB suffix model.
Mark Z. |
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| Arfa Daily... |
| Posted: Mon Nov 09, 2009 8:44 pm |
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Guest
|
"Mark Zacharias" <mark_zacharias at (no spam) sbclobal.net> wrote in message
news:0073d7ee$0$23684$c3e8da3 at (no spam) news.astraweb.com...
[quote]"Arfa Daily" <arfa.daily at (no spam) ntlworld.com> wrote in message
news:QLJJm.146835$R52.67855 at (no spam) newsfe24.ams2...
"Meat Plow" <meat at (no spam) petitmorte.net> wrote in message
news:3934cr.df2.17.16 at (no spam) news.alt.net...
On Sun, 8 Nov 2009 01:41:13 -0000, "Arfa Daily"
arfa.daily at (no spam) ntlworld.com>wrote:
"b" <reverend_rogers at (no spam) yahoo.com> wrote in message
news:2a47cb00-6c48-4f8d-94e4-18c7b532def6 at (no spam) d21g2000yqn.googlegroups.com...
On 7 nov, 17:12, "David B." <db... at (no spam) glis.net> wrote:stanby light
flashes 7 times.
Does anyone knowwhat would cause the above issue and how I could fix
it?
yeah. it's broken.
seriously now, you will need to get in there and measure a few
voltages , test a few components and at least give us the chassis
reference if you expect any more detailed help than the above!
Flashing LEDs can mean almost anything, from a dry joint to a
transformer failure, and are not a relaible guide. If I were you, I
would take the set to a local repair place and get a quote, based on
proper diagnosis rather than any internet guesswork. The inside of a
TV is no place to be if you have no electroncis experience.
best of luck.
-B
With Sony TV sets, the number of times that the LED blinks, is generally
a
code to refer you to the faulty area. ISTR that 7 flashes indicates a
horizontal deflection failure, so I guess that the first favourite would
have to be the HOP transistor short circuit, although be aware that
there
are issues which can cause transistor failure.
Like the driver/driver coupling.
Yes, quite so. Anything in the base coupling circuit which slows the
transition of the drive waveform will do it. Also bad joints on the
driver transformer when one is used, bad joints on the driver transistor,
faulty flyback tuning caps, faulty HOPTx, and incorrect HT volts to name
a few more common ones.
Arfa
Worked on quite a few of these the past couple years. IC8002 is a frequent
offender. These models are quite different from the standard issue type
we've seen for so many years. I'm actually a relative newbie on TV's,
having been "promoted" to working on them in-shop with the other guys
always out on service calls, but just to give you an idea how different
these sets are from the norm, I can tell you the high voltage is a
complete separate circuit from the 200 volt line. This is because of the
different scan rates supported.
IC8002 provides the PWM drive for the high voltage. IC6501 relates to the
200 volt line. The typical failure mode is that sometimes the set will
fire up just fine, then maybe not for days on end, then mysteriously start
working again, sometimes for up to a couple months.
If the white 0.1 ohm Micron resistors are OK, then IC8002 is by far the
most likely suspect. If the 0.1 resistor associated with that set of FET
switchers is open, then of course those transistors are bad. This seems to
be the case only very rarely, mainly if the flyback(LOPT) goes tango
uniform.
The IC's involved, again are generically known as MCZ3001D and should be
replaced with the newer DB suffix model.
Mark Z.
[/quote]
Aha ! I bow to your definitely superior knowledge on this chassis then Mark.
It's not one that I've had cause to work on I think - in fact nowadays, I
try to steer clear of TV sets altogether. I was just thinking back to all
the Sony models with the LED flash codes, and remembering (I think) that 7
flashes was a H def failure, when the HOP and HV were all part and parcel of
the same stage.
Arfa |
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| Meat Plow... |
| Posted: Tue Nov 10, 2009 8:11 am |
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Guest
|
On Tue, 10 Nov 2009 01:44:14 -0000, "Arfa Daily"
<arfa.daily at (no spam) ntlworld.com>wrote:
[quote]
"Mark Zacharias" <mark_zacharias at (no spam) sbclobal.net> wrote in message
news:0073d7ee$0$23684$c3e8da3 at (no spam) news.astraweb.com...
"Arfa Daily" <arfa.daily at (no spam) ntlworld.com> wrote in message
news:QLJJm.146835$R52.67855 at (no spam) newsfe24.ams2...
"Meat Plow" <meat at (no spam) petitmorte.net> wrote in message
news:3934cr.df2.17.16 at (no spam) news.alt.net...
On Sun, 8 Nov 2009 01:41:13 -0000, "Arfa Daily"
arfa.daily at (no spam) ntlworld.com>wrote:
"b" <reverend_rogers at (no spam) yahoo.com> wrote in message
news:2a47cb00-6c48-4f8d-94e4-18c7b532def6 at (no spam) d21g2000yqn.googlegroups.com...
On 7 nov, 17:12, "David B." <db... at (no spam) glis.net> wrote:stanby light
flashes 7 times.
Does anyone knowwhat would cause the above issue and how I could fix
it?
yeah. it's broken.
seriously now, you will need to get in there and measure a few
voltages , test a few components and at least give us the chassis
reference if you expect any more detailed help than the above!
Flashing LEDs can mean almost anything, from a dry joint to a
transformer failure, and are not a relaible guide. If I were you, I
would take the set to a local repair place and get a quote, based on
proper diagnosis rather than any internet guesswork. The inside of a
TV is no place to be if you have no electroncis experience.
best of luck.
-B
With Sony TV sets, the number of times that the LED blinks, is generally
a
code to refer you to the faulty area. ISTR that 7 flashes indicates a
horizontal deflection failure, so I guess that the first favourite would
have to be the HOP transistor short circuit, although be aware that
there
are issues which can cause transistor failure.
Like the driver/driver coupling.
Yes, quite so. Anything in the base coupling circuit which slows the
transition of the drive waveform will do it. Also bad joints on the
driver transformer when one is used, bad joints on the driver transistor,
faulty flyback tuning caps, faulty HOPTx, and incorrect HT volts to name
a few more common ones.
Arfa
Worked on quite a few of these the past couple years. IC8002 is a frequent
offender. These models are quite different from the standard issue type
we've seen for so many years. I'm actually a relative newbie on TV's,
having been "promoted" to working on them in-shop with the other guys
always out on service calls, but just to give you an idea how different
these sets are from the norm, I can tell you the high voltage is a
complete separate circuit from the 200 volt line. This is because of the
different scan rates supported.
IC8002 provides the PWM drive for the high voltage. IC6501 relates to the
200 volt line. The typical failure mode is that sometimes the set will
fire up just fine, then maybe not for days on end, then mysteriously start
working again, sometimes for up to a couple months.
If the white 0.1 ohm Micron resistors are OK, then IC8002 is by far the
most likely suspect. If the 0.1 resistor associated with that set of FET
switchers is open, then of course those transistors are bad. This seems to
be the case only very rarely, mainly if the flyback(LOPT) goes tango
uniform.
The IC's involved, again are generically known as MCZ3001D and should be
replaced with the newer DB suffix model.
Mark Z.
Aha ! I bow to your definitely superior knowledge on this chassis then Mark.
It's not one that I've had cause to work on I think - in fact nowadays, I
try to steer clear of TV sets altogether. I was just thinking back to all
the Sony models with the LED flash codes, and remembering (I think) that 7
flashes was a H def failure, when the HOP and HV were all part and parcel of
the same stage.
[/quote]
Leave it to Sony to screw things up  |
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| Fleetie... |
| Posted: Tue Nov 10, 2009 2:57 pm |
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Guest
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Does anyone have the Sony blink codes list for a KV-25F1U ?
Mine gave me a fright yesterday afternoon when I got back from work.
I switched it on and it just blinked at me. I *think* it was 27 times,
but I am not sure.
It died in October 2006 and I had it repaired. Back then I did find
a list of the blink code meanings on the net using Google, I think,
but this time I could not.
Anyway, I switched the TV RIGHT off (it usually stays on "standby"),
let the room warm up (yesterday was easily the coldest day so far this
winter), and tried again, and it was fine. No problem today, either.
But I'd be interested to see the list, if anyone can post a copy.
Thanks.
Martin |
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