Toshiba Projection TV Help.

[PiNhEaD]

I have a Toshiba model TP5580A projection TV that was given to me by a
friend. This is a older unit manufactured in 1992. I was told the picture
was blurry so I cleaned the lenses and the mirror before plugging it in and
the picture is nice and bright and crisp believe it or not. But when I turn
it on there is a horizontal line in the center of the TV. It looks like the
picture is getting sucked into the line. After it warms up for about 5
minutes the line moves upward about 12 inches above center and becomes very
faint. At this point nothing is being sucked into it anymore and it is just
a couple of small faint lines. You can only see the lines when the TV has a
light picture on it. Anyway most people don't even see the lines at this
point but it is driving me crazy. I have never worked on a projection TV
before but I do repair arcade monitors on a regular basis. Based on my
experience with arcade monitors I would think the problem lies with the
horizontal output transistor either starting to go bad or a cold solder
joint. But I do not have any schematics or service manual to work from.
Unlike an arcade monitor which has one circuit board this has several pcb's
as well as 3 crt's. Can anyone point me in the right direction or better
yet tell me where I can obtain a service manual and schematics, preferably
in adobe acrobat format. I have been searching google for the last 2 days
in my free time looking for anything related to this issue and found
nothing. I did see many posts about fluid leaking out onto the boards
causing a variety of problems but nothing like this.


Thanks, in advance

Pat

 

[David]

If the service manual is still available, you need to buy it from any
Toshiba authorized parts dealer. Toshiba has a pretty strict policy of only
selling service information to servicers for what they call legal liability
issues.

As to your problem, you need to look for high ESR capacitors in the vertical
deflection circuit and power supplies. If you are not sure how to do this,
you are probably better off having the unit repaired by an experienced
technician. Most repairs if the set is mostly working and you can take it
in on a set like this come in well under $250 total.

David

PiNhEaD <heypatsales@wideopenwest.com> wrote in message
news:Jm6dnZa4rcxgssCiXTWJhg@wideopenwest.com...

I have a Toshiba model TP5580A projection TV that was given to me by a
friend. This is a older unit manufactured in 1992. I was told the picture
was blurry so I cleaned the lenses and the mirror before plugging it in
and
the picture is nice and bright and crisp believe it or not. But when I
turn
it on there is a horizontal line in the center of the TV. It looks like
the
picture is getting sucked into the line. After it warms up for about 5
minutes the line moves upward about 12 inches above center and becomes
very
faint. At this point nothing is being sucked into it anymore and it is
just
a couple of small faint lines. You can only see the lines when the TV has
a
light picture on it. Anyway most people don't even see the lines at this
point but it is driving me crazy. I have never worked on a projection TV
before but I do repair arcade monitors on a regular basis. Based on my
experience with arcade monitors I would think the problem lies with the
horizontal output transistor either starting to go bad or a cold solder
joint. But I do not have any schematics or service manual to work from.
Unlike an arcade monitor which has one circuit board this has several
pcb's
as well as 3 crt's. Can anyone point me in the right direction or better
yet tell me where I can obtain a service manual and schematics, preferably
in adobe acrobat format. I have been searching google for the last 2 days
in my free time looking for anything related to this issue and found
nothing. I did see many posts about fluid leaking out onto the boards
causing a variety of problems but nothing like this.


Thanks, in advance

Pat

 

[heypat1]

"David" <dkuhajda@locl.net.spam> wrote in message news:<3f5d5efd@news.greennet.net>...

If the service manual is still available, you need to buy it from any
Toshiba authorized parts dealer. Toshiba has a pretty strict policy of only
selling service information to servicers for what they call legal liability
issues.

As to your problem, you need to look for high ESR capacitors in the vertical
deflection circuit and power supplies. If you are not sure how to do this,
you are probably better off having the unit repaired by an experienced
technician. Most repairs if the set is mostly working and you can take it
in on a set like this come in well under $250 total.

David


PiNhEaD <heypatsales@wideopenwest.com> wrote in message

Well there is no way im taking it in for repair, what fun would that be.
If I were that lazy I would just go buy a new one money is not the
issue. I am more than capable of testing and replacing capacitors, every
monitor I rebuild gets a complete cap kit. Since I know the problem
dissipates when the set is warm I will start tonight with a can of
freeze spray to try and isolate the component. I still want to get my
hands on a service manual, I can find the bad component and replace it
if I poke around enough but lets face it life is much easier with a
manual and a set of schematics. Sure would be nice to check my voltages
and make sure they are O.K.

As always any help is appreciated. Still looking for a service manual.

Thanks,

Pat

 

[john]

You dont need a service manual to ESR caps ...

kip

--

As always any help is appreciated. Still looking for a service manual.

Thanks,

Pat

 

[David]

You should have no problem identifying the vertical output circuit as it
likely will be an IC or a couple of transistors on heatsink nearly directly
connected to one side of the deflection yokes.

Then there is the jungle ic which does most of the signal processing and
sync processing, 64 pin or so ic.

Toshiba may still have been labeling the boards in 92 with the general
locations of the circuits.

The service manual will be a tough one to find. In 92 Toshiba had
relatively few authorized servicer which would have had the manual. Since
then many independent servicers have simply gone out of business. You might
get lucky and find a local servicer that is willing to sell you the old copy
(if they have one) as odds are very low they will ever see that model again
due to the extreme old age.

David

heypat1 <heypat1@comcast.net> wrote in message
news:8674e8b9.0309090330.1fcaaf36@posting.google.com...

"David" <dkuhajda@locl.net.spam> wrote in message
news:<3f5d5efd@news.greennet.net>...
If the service manual is still available, you need to buy it from any
Toshiba authorized parts dealer. Toshiba has a pretty strict policy of
only
selling service information to servicers for what they call legal
liability
issues.

As to your problem, you need to look for high ESR capacitors in the
vertical
deflection circuit and power supplies. If you are not sure how to do
this,
you are probably better off having the unit repaired by an experienced
technician. Most repairs if the set is mostly working and you can take
it
in on a set like this come in well under $250 total.

David


PiNhEaD <heypatsales@wideopenwest.com> wrote in message

Well there is no way im taking it in for repair, what fun would that be.
If I were that lazy I would just go buy a new one money is not the
issue. I am more than capable of testing and replacing capacitors, every
monitor I rebuild gets a complete cap kit. Since I know the problem
dissipates when the set is warm I will start tonight with a can of
freeze spray to try and isolate the component. I still want to get my
hands on a service manual, I can find the bad component and replace it
if I poke around enough but lets face it life is much easier with a
manual and a set of schematics. Sure would be nice to check my voltages
and make sure they are O.K.

As always any help is appreciated. Still looking for a service manual.

Thanks,

Pat

 

[PiNhEaD]

Very little time to look at it tonight, had to work late and open house
(meet the teachers) at my sons school. I did have about 45 minutes when I
got home from work earlier. I followed the wires back from the yoke to the
board knowing this would get me in the general area then I looked for the
transistor on the heat sink and started spraying components one at a time
with the freeze spray. Knowing the problem went away when the set heated up
I let it warm up first until the problem was almost gone. Then when I hit
cap # 332 and 315 with the freeze spray the problem comes back right away
and 10 x worse. Just to confirm I heated it back up with my heat gun and the
problem went right away. These 2 caps are right next to each other and it
was hard to spray one cap with the freeze spray and not the other, same goes
for the heat gun. I do not have a esr meter so this was a quick way for me
to find the bad component while the board was still in the TV. I pulled the
board and wrote down the capacitor values so I can pick them up tomorrow.
Figures I have hundreds of caps around that I use all the time on arcade
monitors but I did not have a 160V 220 mf anywhere. I hope to have time
tomorrow to pull my out my scope and function generator so I can check the
esr on the rest of the caps. Only makes sense to check all of them and
replace any bad ones while the board is out.


It would still be nice to run across a service manual. There is so much more
to these then arcade monitors I wanted to get the service manual so I could
take a good look at the circuits and any material related to the lenses and
the fluid in the lenses etc. Always looking to learn more

Thanks for the help and I will keep you posted.

Pat




"David" <dkuhajda@locl.net.spam> wrote in message
news:3f5ea74e@news.greennet.net...

You should have no problem identifying the vertical output circuit as it
likely will be an IC or a couple of transistors on heatsink nearly
directly
connected to one side of the deflection yokes.

Then there is the jungle ic which does most of the signal processing and
sync processing, 64 pin or so ic.

Toshiba may still have been labeling the boards in 92 with the general
locations of the circuits.

The service manual will be a tough one to find. In 92 Toshiba had
relatively few authorized servicer which would have had the manual. Since
then many independent servicers have simply gone out of business. You
might
get lucky and find a local servicer that is willing to sell you the old
copy
(if they have one) as odds are very low they will ever see that model
again
due to the extreme old age.

David

heypat1 <heypat1@comcast.net> wrote in message
news:8674e8b9.0309090330.1fcaaf36@posting.google.com...
"David" <dkuhajda@locl.net.spam> wrote in message
news:<3f5d5efd@news.greennet.net>...
If the service manual is still available, you need to buy it from any
Toshiba authorized parts dealer. Toshiba has a pretty strict policy
of
only
selling service information to servicers for what they call legal
liability
issues.

As to your problem, you need to look for high ESR capacitors in the
vertical
deflection circuit and power supplies. If you are not sure how to do
this,
you are probably better off having the unit repaired by an experienced
technician. Most repairs if the set is mostly working and you can
take
it
in on a set like this come in well under $250 total.

David


PiNhEaD <heypatsales@wideopenwest.com> wrote in message

Well there is no way im taking it in for repair, what fun would that be.
If I were that lazy I would just go buy a new one money is not the
issue. I am more than capable of testing and replacing capacitors, every
monitor I rebuild gets a complete cap kit. Since I know the problem
dissipates when the set is warm I will start tonight with a can of
freeze spray to try and isolate the component. I still want to get my
hands on a service manual, I can find the bad component and replace it
if I poke around enough but lets face it life is much easier with a
manual and a set of schematics. Sure would be nice to check my voltages
and make sure they are O.K.

As always any help is appreciated. Still looking for a service manual.

Thanks,

Pat

 

[PiNhEaD]

Replaced the 2 caps I hit with the freeze spray and found 2 more that needed
to be replaced. Fired it up and it works great, picture is even better then
before. It has been running for about 3 hours now with no issues.

Thanks for the help

Pat


"PiNhEaD" <heypatsales@wideopenwest.com> wrote in message
news:epydnfX5etj3EcOiU-KYgw@wideopenwest.com...

Very little time to look at it tonight, had to work late and open house
(meet the teachers) at my sons school. I did have about 45 minutes when I
got home from work earlier. I followed the wires back from the yoke to the
board knowing this would get me in the general area then I looked for the
transistor on the heat sink and started spraying components one at a time
with the freeze spray. Knowing the problem went away when the set heated
up
I let it warm up first until the problem was almost gone. Then when I hit
cap # 332 and 315 with the freeze spray the problem comes back right away
and 10 x worse. Just to confirm I heated it back up with my heat gun and
the
problem went right away. These 2 caps are right next to each other and it
was hard to spray one cap with the freeze spray and not the other, same
goes
for the heat gun. I do not have a esr meter so this was a quick way for me
to find the bad component while the board was still in the TV. I pulled
the
board and wrote down the capacitor values so I can pick them up tomorrow.
Figures I have hundreds of caps around that I use all the time on arcade
monitors but I did not have a 160V 220 mf anywhere. I hope to have time
tomorrow to pull my out my scope and function generator so I can check the
esr on the rest of the caps. Only makes sense to check all of them and
replace any bad ones while the board is out.


It would still be nice to run across a service manual. There is so much
more
to these then arcade monitors I wanted to get the service manual so I
could
take a good look at the circuits and any material related to the lenses an
d
the fluid in the lenses etc. Always looking to learn more

Thanks for the help and I will keep you posted.

Pat




"David" <dkuhajda@locl.net.spam> wrote in message
news:3f5ea74e@news.greennet.net...
You should have no problem identifying the vertical output circuit as it
likely will be an IC or a couple of transistors on heatsink nearly
directly
connected to one side of the deflection yokes.

Then there is the jungle ic which does most of the signal processing and
sync processing, 64 pin or so ic.

Toshiba may still have been labeling the boards in 92 with the general
locations of the circuits.

The service manual will be a tough one to find. In 92 Toshiba had
relatively few authorized servicer which would have had the manual.
Since
then many independent servicers have simply gone out of business. You
might
get lucky and find a local servicer that is willing to sell you the old
copy
(if they have one) as odds are very low they will ever see that model
again
due to the extreme old age.

David

heypat1 <heypat1@comcast.net> wrote in message
news:8674e8b9.0309090330.1fcaaf36@posting.google.com...
"David" <dkuhajda@locl.net.spam> wrote in message
news:<3f5d5efd@news.greennet.net>...
If the service manual is still available, you need to buy it from
any
Toshiba authorized parts dealer. Toshiba has a pretty strict policy
of
only
selling service information to servicers for what they call legal
liability
issues.

As to your problem, you need to look for high ESR capacitors in the
vertical
deflection circuit and power supplies. If you are not sure how to
do
this,
you are probably better off having the unit repaired by an
experienced
technician. Most repairs if the set is mostly working and you can
take
it
in on a set like this come in well under $250 total.

David


PiNhEaD <heypatsales@wideopenwest.com> wrote in message

Well there is no way im taking it in for repair, what fun would that
be.
If I were that lazy I would just go buy a new one money is not the
issue. I am more than capable of testing and replacing capacitors,
every
monitor I rebuild gets a complete cap kit. Since I know the problem
dissipates when the set is warm I will start tonight with a can of
freeze spray to try and isolate the component. I still want to get my
hands on a service manual, I can find the bad component and replace it
if I poke around enough but lets face it life is much easier with a
manual and a set of schematics. Sure would be nice to check my
voltages
and make sure they are O.K.

As always any help is appreciated. Still looking for a service manual.

Thanks,

Pat