Toshiba CF3060K TV dead

J

john KB5AG

Guest
After 10 years of exemplary service, my Toshiba TV died.
Seemed like a good excuse to buy a new one (and I did), but now I'd like to
fix this one if I can. I do a lot of radio repair, but haven't been much
for TV repair.

Nothing extraordinary happened, it just refused to turn on one day. Pushing
the power button activates a relay inside, and I can hear a switching power
supply whine, but the power light won't light, and there's no other sign of
life. I've looked inside and there's no sign of any smoky IC's or
transistors. All the fuses I can find are good.

So I have a couple of questions to help me get started:

1. Is this a fairly common failure symptom for this set, and is it "usually
that 2nd IC on the left", or shall I just get down to basic troublshooting?

2. What would be a good source for a service manual or schematic for this
one? I tried Tritronics but it seemed to be No Longer Available.

Any help will be appreciated!

John KB5AG
 
Probably want to check the obvious like power supply voltages, open fuses,
shorted components, etc. Due to the age you may find many of the
electrolytic caps that have just failed due to age, using an esr meter will
assist in checking them. Prime suspect initially would be to check the horiz
output for shorts and see if the power on relay at least clicks when
pressing the power button. The relay clicks indicate you at least have
standby, the rest will be a matter of finding what is causing the rest of
the set to not operate. If the picture quality was good before failure it
may be worth attempting to repair the set. 73"s
"john KB5AG" <notme@spam.not> wrote in message
news:Ao_nb.2196$cL5.639551556@twister2.starband.net...
After 10 years of exemplary service, my Toshiba TV died.
Seemed like a good excuse to buy a new one (and I did), but now I'd like
to
fix this one if I can. I do a lot of radio repair, but haven't been much
for TV repair.

Nothing extraordinary happened, it just refused to turn on one day.
Pushing
the power button activates a relay inside, and I can hear a switching
power
supply whine, but the power light won't light, and there's no other sign
of
life. I've looked inside and there's no sign of any smoky IC's or
transistors. All the fuses I can find are good.

So I have a couple of questions to help me get started:

1. Is this a fairly common failure symptom for this set, and is it
"usually
that 2nd IC on the left", or shall I just get down to basic
troublshooting?

2. What would be a good source for a service manual or schematic for this
one? I tried Tritronics but it seemed to be No Longer Available.

Any help will be appreciated!

John KB5AG
Click to expand...
 
This model has a high failure rate for the yoke.
The description you gave would lead me to this circuit area.
Unfortunately, the yoke is bonded for this model so it's off to the junk
pile unless you are lucky.
Take the back off and see if you can determine if the yoke is sizzling when
it tries to start up.

Good Luck,

Bill Jr


"Arthur Jernberg" <stubby@comcast.net> wrote in message
news:HNudnSUq4Np04j2iRVn-jw@comcast.com...
Probably want to check the obvious like power supply voltages, open fuses,
shorted components, etc. Due to the age you may find many of the
electrolytic caps that have just failed due to age, using an esr meter
will
assist in checking them. Prime suspect initially would be to check the
horiz
output for shorts and see if the power on relay at least clicks when
pressing the power button. The relay clicks indicate you at least have
standby, the rest will be a matter of finding what is causing the rest of
the set to not operate. If the picture quality was good before failure it
may be worth attempting to repair the set. 73"s
"john KB5AG" <notme@spam.not> wrote in message
news:Ao_nb.2196$cL5.639551556@twister2.starband.net...
After 10 years of exemplary service, my Toshiba TV died.
Seemed like a good excuse to buy a new one (and I did), but now I'd like
to
fix this one if I can. I do a lot of radio repair, but haven't been
much
for TV repair.

Nothing extraordinary happened, it just refused to turn on one day.
Pushing
the power button activates a relay inside, and I can hear a switching
power
supply whine, but the power light won't light, and there's no other sign
of
life. I've looked inside and there's no sign of any smoky IC's or
transistors. All the fuses I can find are good.

So I have a couple of questions to help me get started:

1. Is this a fairly common failure symptom for this set, and is it
"usually
that 2nd IC on the left", or shall I just get down to basic
troublshooting?

2. What would be a good source for a service manual or schematic for
this
one? I tried Tritronics but it seemed to be No Longer Available.

Any help will be appreciated!

John KB5AG
Click to expand...
 
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