Help with Toshiba TV

[David DiBattista]

I have an older (1992) Toshiba 26" TV (Model No. CF2668B), which had the
well documented vertical problems: black band at the bottom of the picture,
compressed lower half of the screen, etc.

I replaced capacitors C301 & C305, as previously suggested in some archive
threads, with high temperature Tantalums I found at Digikey. There does not
appear to be a C308 on this set.

The vertical linearity seems to be pretty good now, except for a narrow
bouncing white line near the bottom of the screen for the first five minutes
or so until the set warms up.

The problem now is that there are nearly horizontal white lines running up
the entire screen about an inch or so apart, and the picture, text in
particular, seems to be a bit fuzzy.

Possibly related, but doubtful, is that the speakers on the set are not
working, although the audio-out jack on the back works if hooked up to a
separate amp and speakers.

Any suggestions would be greatly appreciated.

 

[Sofie]

David DiBattista:
You should replace the ALL rest of the C3xx series capacitors.... all of
these are in and around the vertical deflection circuitry...... and be
certain to re-solder the connections to the vertical output chip.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
-------------------------


"David DiBattista" <Dabappa@cox.net> wrote in message
news:nMJKb.26344$WQ3.8170@lakeread05...

I have an older (1992) Toshiba 26" TV (Model No. CF2668B), which had the
well documented vertical problems: black band at the bottom of the
picture,
compressed lower half of the screen, etc.

I replaced capacitors C301 & C305, as previously suggested in some archive
threads, with high temperature Tantalums I found at Digikey. There does
not
appear to be a C308 on this set.

The vertical linearity seems to be pretty good now, except for a narrow
bouncing white line near the bottom of the screen for the first five
minutes
or so until the set warms up.

The problem now is that there are nearly horizontal white lines running up
the entire screen about an inch or so apart, and the picture, text in
particular, seems to be a bit fuzzy.

Possibly related, but doubtful, is that the speakers on the set are not
working, although the audio-out jack on the back works if hooked up to a
separate amp and speakers.

Any suggestions would be greatly appreciated.

 

[David]

Thanks for the advice. I was hoping for something simpler, but at least
this shouldn't be expensive.

Could you tell me what type of capacitors these would be, or if it would be
okay to stick with the Tantalums; this would make it easier for me to find
them in the catalog (I'm a mechanical engineer).

Also, are there any "usual suspects" I could investigate to fix speakers. I
assume since the audio out jack is functioning, it must be something in the
amplification circuit.

--

Regards,
David DiBattista
Sales Engineer
Standard Bellows Company
David@std-bellows.com


"Sofie" <sofie@olypen.com> wrote in message
news:vvmsn6nsih8ie6@corp.supernews.com...

David DiBattista:
You should replace the ALL rest of the C3xx series capacitors.... all of
these are in and around the vertical deflection circuitry...... and be
certain to re-solder the connections to the vertical output chip.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
-------------------------


"David DiBattista" <Dabappa@cox.net> wrote in message
news:nMJKb.26344$WQ3.8170@lakeread05...
I have an older (1992) Toshiba 26" TV (Model No. CF2668B), which had the
well documented vertical problems: black band at the bottom of the
picture,
compressed lower half of the screen, etc.

I replaced capacitors C301 & C305, as previously suggested in some
archive
threads, with high temperature Tantalums I found at Digikey. There does
not
appear to be a C308 on this set.

The vertical linearity seems to be pretty good now, except for a narrow
bouncing white line near the bottom of the screen for the first five
minutes
or so until the set warms up.

The problem now is that there are nearly horizontal white lines running
up
the entire screen about an inch or so apart, and the picture, text in
particular, seems to be a bit fuzzy.

Possibly related, but doubtful, is that the speakers on the set are not
working, although the audio-out jack on the back works if hooked up to a
separate amp and speakers.

Any suggestions would be greatly appreciated.

 

[David DiBattista]

I read through the FAQ at www.repairfaq.org and found the section on
"White/grey retrace lines" and adjusted the Screen control as suggested.
The picture is quite good now.


"Sofie" <sofie@olypen.com> wrote in message
news:vvmsn6nsih8ie6@corp.supernews.com...

David DiBattista:
You should replace the ALL rest of the C3xx series capacitors.... all of
these are in and around the vertical deflection circuitry...... and be
certain to re-solder the connections to the vertical output chip.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
-------------------------


"David DiBattista" <Dabappa@cox.net> wrote in message
news:nMJKb.26344$WQ3.8170@lakeread05...
I have an older (1992) Toshiba 26" TV (Model No. CF2668B), which had the
well documented vertical problems: black band at the bottom of the
picture,
compressed lower half of the screen, etc.

I replaced capacitors C301 & C305, as previously suggested in some
archive
threads, with high temperature Tantalums I found at Digikey. There does
not
appear to be a C308 on this set.

The vertical linearity seems to be pretty good now, except for a narrow
bouncing white line near the bottom of the screen for the first five
minutes
or so until the set warms up.

The problem now is that there are nearly horizontal white lines running
up
the entire screen about an inch or so apart, and the picture, text in
particular, seems to be a bit fuzzy.

Possibly related, but doubtful, is that the speakers on the set are not
working, although the audio-out jack on the back works if hooked up to a
separate amp and speakers.

Any suggestions would be greatly appreciated.

 

[David DiBattista]

I tracked down the audio problem, again with the help of www.repairfaq.org.
It turns out both of the speakers are blown.




"David" <spam@spam.com> wrote in message
news:2H%Kb.37454$F22.3282@lakeread02...

Thanks for the advice. I was hoping for something simpler, but at least
this shouldn't be expensive.

Could you tell me what type of capacitors these would be, or if it would
be
okay to stick with the Tantalums; this would make it easier for me to find
them in the catalog (I'm a mechanical engineer).

Also, are there any "usual suspects" I could investigate to fix speakers.
I
assume since the audio out jack is functioning, it must be something in
the
amplification circuit.

--

Regards,
David DiBattista
Sales Engineer
Standard Bellows Company
David@std-bellows.com


"Sofie" <sofie@olypen.com> wrote in message
news:vvmsn6nsih8ie6@corp.supernews.com...
David DiBattista:
You should replace the ALL rest of the C3xx series capacitors.... all
of
these are in and around the vertical deflection circuitry...... and be
certain to re-solder the connections to the vertical output chip.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
-------------------------


"David DiBattista" <Dabappa@cox.net> wrote in message
news:nMJKb.26344$WQ3.8170@lakeread05...
I have an older (1992) Toshiba 26" TV (Model No. CF2668B), which had
the
well documented vertical problems: black band at the bottom of the
picture,
compressed lower half of the screen, etc.

I replaced capacitors C301 & C305, as previously suggested in some
archive
threads, with high temperature Tantalums I found at Digikey. There
does
not
appear to be a C308 on this set.

The vertical linearity seems to be pretty good now, except for a
narrow
bouncing white line near the bottom of the screen for the first five
minutes
or so until the set warms up.

The problem now is that there are nearly horizontal white lines
running
up
the entire screen about an inch or so apart, and the picture, text in
particular, seems to be a bit fuzzy.

Possibly related, but doubtful, is that the speakers on the set are
not
working, although the audio-out jack on the back works if hooked up to
a
separate amp and speakers.

Any suggestions would be greatly appreciated.