My cousin has a Toshiba tp48c50 rear projection tv that has a geometry
problem with the red tube. The picture is good in the center but twards the
edges the red is bent in like the trapazoid adjustment needs to be adjusted.
He called me thinking he needed a new red tube and I told him that it is
probably something else since it isn't dim and it is still in focus.

Does anybody have any ideas where to start with this?

- Mike

Michael Kennedy wrote:
My cousin has a Toshiba tp48c50 rear projection tv that has a geometry
problem with the red tube. The picture is good in the center but twards the
edges the red is bent in like the trapazoid adjustment needs to be adjusted.
He called me thinking he needed a new red tube and I told him that it is
probably something else since it isn't dim and it is still in focus.

Does anybody have any ideas where to start with this?

- Mike

Repair the convergence circuit, probably the red output, and realign
the convergence using a test pattern generator and alignment manual
procedure.

Does anybody have the service manual for this TV?

- Mike

Yes we all do.
"Michael Kennedy" wrote in message
...
Does anybody have the service manual for this TV?

- Mike

"kip" wrote in message
.. .
Yes we all do.

Okay.. maybe I should restate tha question.. Would anybody be nice enough to
give me the location of this service manual? If you didn' see my parrent
post it is a Toshiba tp48c50.

- Mike

You should try Toshiba parts distributors like Tritronics. The manuals are
very reasonable for these sets if it still available. I think this one was
only available on paper and you are unlikely to find it online. I don't
know of any scans of it on any of the sites I use for manuals.

Leonard

"Michael Kennedy" wrote in message
...

"kip" wrote in message
.. .
Yes we all do.

Okay.. maybe I should restate tha question.. Would anybody be nice enough
to give me the location of this service manual? If you didn' see my
parrent post it is a Toshiba tp48c50.

- Mike

Thanks..
I guess I'll be ordering it.
- Mike

"Leonard Caillouet" wrote in message
news:yFy4g.4184$B42.3133@dukeread05...
You should try Toshiba parts distributors like Tritronics. The manuals
are very reasonable for these sets if it still available. I think this
one was only available on paper and you are unlikely to find it online. I
don't know of any scans of it on any of the sites I use for manuals.

Leonard

"Michael Kennedy" wrote in message
...

"kip" wrote in message
.. .
Yes we all do.

Okay.. maybe I should restate tha question.. Would anybody be nice enough
to give me the location of this service manual? If you didn' see my
parrent post it is a Toshiba tp48c50.

- Mike

The C-line sets are very simple, analog convergence, and the Convergence
IC's are on a approx. 5x8 PCB held in with 5 screws located near the center
of the chassis. The board can be removed without disturbing anything else.
Look for the 2 large heatsinks and you'll find it. Be sure to note where
each connector goes as you unplug it, and check the electrolytic caps while
you have the board out. STK392-020 in these if I remember correctly. Replace
them both while you have the board out, cheap insurance. That should fix you
up. The convergence control PCB is in the front of the set, remove the
speaker grille and the plastic cover under it, Conv Ctrl panel is underneath
that. Pushbutton switch turns on the internal crosshatch generator, and the
pots on the board should be labeled. If you have done any pjtv
repair/convergence before this unit should be a cakewalk for you. I never
needed a manual on any of the C or D line sets.

Jammy

"Michael Kennedy" wrote in message
...
Thanks..
I guess I'll be ordering it.
- Mike

Well I havn't worked on any projection tvs before but it sounds relatively
easy..

- Mike
"ampdoc" wrote in message
. ..
The C-line sets are very simple, analog convergence, and the Convergence
IC's are on a approx. 5x8 PCB held in with 5 screws located near the
center of the chassis. The board can be removed without disturbing
anything else. Look for the 2 large heatsinks and you'll find it. Be sure
to note where each connector goes as you unplug it, and check the
electrolytic caps while you have the board out. STK392-020 in these if I
remember correctly. Replace them both while you have the board out, cheap
insurance. That should fix you up. The convergence control PCB is in the
front of the set, remove the speaker grille and the plastic cover under
it, Conv Ctrl panel is underneath that. Pushbutton switch turns on the
internal crosshatch generator, and the pots on the board should be
labeled. If you have done any pjtv repair/convergence before this unit
should be a cakewalk for you. I never needed a manual on any of the C or D
line sets.

Jammy

"Michael Kennedy" wrote in message
...
Thanks..
I guess I'll be ordering it.
- Mike