TV vertical woes

[Peter E. Orban]

Happy New Year to Everyone!

I have two TVs with vertical problems.

The first one is a Toshiba CM915C ch# 8516, with the lower 15% of the
picture folded back.
I built an ESR meter during the break (555 timer and scope), and found
and replaced a number of electrolytic caps in the vertical stage. It did
not help. I also replaced the vertical IC (AN5515) from another TV,
still the same problem. Anything else to check? I will go through the
other components if someone could give the values for those. Anyone has
access to the schematics, the sample application circuit on the AN5515
data sheet seems to be different than the one used in that particular
TV?

The other TV is a Mitsubishi CS21SX1C ch# XL-B-CSX1, with no vertical
deflection. Nothing seems to be fried visually, the caps check out ok
for ESR, no obvious sign of leakage. What is the vertical IC used in
that TV? It is a 13 pin SIP IC, and no number on it. Again, I do not
have a schematics, and finding a data sheet on that IC might help
diagnosing the problem (the yoke is not open).

Thanks for the help,

Peter
--
Peter E. Orban
National Research Council of Canada
e-mail: peter.orban@nrc.ca

 

[Sofie]

Peter E Orban:
Did you use your search engine to try to find answers to your questions?
If you were to do a google group search with the phrase "Toshiba Vertical
Problems" you would find hundreds of useful repair suggestions including the
most likely overlooked suspect electrolytic ... C301 it is near the
jungle chip about 3 or 4 inches toward the center of the board away from the
AN5515. Also, other frequent culprits are C302, C305, C308 ..... and
others.
The same advice goes for your Mitsubishi television....... a lot of
different issues including conductive glue, faulty PIP smd electrolytics,
etc, etc.
Take some time now to do some of your own searching to find possible answers
and solutions.
Also you should visit the web site for this newsgroup at
http://www.repairfaq.org/
There you will find a wealth of information, troubleshooting tips, repair
procedures, etc..... but it will take a little search time on your part.
You will find that most of the time that your questions have already been
answered by someone's past repair experiences.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
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"Peter E. Orban" <peter.orban@nrc.ca> wrote in message
news:3FF98EC2.FA58805D@nrc.ca...

Happy New Year to Everyone!

I have two TVs with vertical problems.

The first one is a Toshiba CM915C ch# 8516, with the lower 15% of the
picture folded back.
I built an ESR meter during the break (555 timer and scope), and found
and replaced a number of electrolytic caps in the vertical stage. It did
not help. I also replaced the vertical IC (AN5515) from another TV,
still the same problem. Anything else to check? I will go through the
other components if someone could give the values for those. Anyone has
access to the schematics, the sample application circuit on the AN5515
data sheet seems to be different than the one used in that particular
TV?

The other TV is a Mitsubishi CS21SX1C ch# XL-B-CSX1, with no vertical
deflection. Nothing seems to be fried visually, the caps check out ok
for ESR, no obvious sign of leakage. What is the vertical IC used in
that TV? It is a 13 pin SIP IC, and no number on it. Again, I do not
have a schematics, and finding a data sheet on that IC might help
diagnosing the problem (the yoke is not open).

Thanks for the help,

Peter
--
Peter E. Orban
National Research Council of Canada
e-mail: peter.orban@nrc.ca

 

[Tim Marcus]

Those Toshibas usually have 2 dried out 2.2uf caps that cause some
trouble. Check c301 near the video chip (in the shielded area) and
c304 (?) near the Vertical IC. They are usually red, and small, and
you can smell them. If the numbers are off, check the numbers of the
Vertical circuit and loacate the 2.2uf cap near the Video chip, and
the 2.2uf chip near the Vert IC. Good Luck- Tim



"Peter E. Orban" <peter.orban@nrc.ca> wrote in message news:<3FF98EC2.FA58805D@nrc.ca>...

Happy New Year to Everyone!

I have two TVs with vertical problems.

The first one is a Toshiba CM915C ch# 8516, with the lower 15% of the
picture folded back.
I built an ESR meter during the break (555 timer and scope), and found
and replaced a number of electrolytic caps in the vertical stage. It did
not help. I also replaced the vertical IC (AN5515) from another TV,
still the same problem. Anything else to check? I will go through the
other components if someone could give the values for those. Anyone has
access to the schematics, the sample application circuit on the AN5515
data sheet seems to be different than the one used in that particular
TV?

The other TV is a Mitsubishi CS21SX1C ch# XL-B-CSX1, with no vertical
deflection. Nothing seems to be fried visually, the caps check out ok
for ESR, no obvious sign of leakage. What is the vertical IC used in
that TV? It is a 13 pin SIP IC, and no number on it. Again, I do not
have a schematics, and finding a data sheet on that IC might help
diagnosing the problem (the yoke is not open).

Thanks for the help,

Peter