toshiba CF2765K vertical deflection problem

G

Gary L. Woodruff

Guest
howdy, I have a Toshiba TV model #CF2765K. It has sound and HV but no
vertical deflection. I have a solid blue line 1/2+ thick in the middle
with thinner lines on the top 1/2 of the screen, bottom 1/2 is dark. I
have replaced the vertical IC as well as C308 & C305. I verified R308. I
still have the same symptoms!! Any and all help is greatly appreciated.

Gary
 
On Tue, 10 Nov 2009 13:17:35 -0500, "Gary L. Woodruff"
<woodruffrepair@frontiernet.net> put finger to keyboard and composed:

howdy, I have a Toshiba TV model #CF2765K. It has sound and HV but no
vertical deflection. I have a solid blue line 1/2+ thick in the middle
with thinner lines on the top 1/2 of the screen, bottom 1/2 is dark. I
have replaced the vertical IC as well as C308 & C305. I verified R308. I
still have the same symptoms!! Any and all help is greatly appreciated.

Gary
Click to expand...
IIRC, some Toshiba chassis had a small electro (1uF or 2.2uF, 50V)
near the jungle IC (TA8xxx ?) go bad.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
howdy, The two caps I changed were 1.0uf and 220uf both near the
vertical IC AN5221. I am not familiar with the term jungle IC! Any and
all help is greatly appreciated.

Thanks, Gary


Franc Zabkar wrote:
On Tue, 10 Nov 2009 13:17:35 -0500, "Gary L. Woodruff"
woodruffrepair@frontiernet.net> put finger to keyboard and composed:

howdy, I have a Toshiba TV model #CF2765K. It has sound and HV but no
vertical deflection. I have a solid blue line 1/2+ thick in the middle
with thinner lines on the top 1/2 of the screen, bottom 1/2 is dark. I
have replaced the vertical IC as well as C308 & C305. I verified R308. I
still have the same symptoms!! Any and all help is greatly appreciated.

Gary

IIRC, some Toshiba chassis had a small electro (1uF or 2.2uF, 50V)
near the jungle IC (TA8xxx ?) go bad.

- Franc Zabkar
Click to expand...
 
On Wed, 11 Nov 2009 15:36:43 -0500, "Gary L. Woodruff"
<woodruffrepair@frontiernet.net> put finger to keyboard and composed:

howdy, The two caps I changed were 1.0uf and 220uf both near the
vertical IC AN5221. I am not familiar with the term jungle IC! Any and
all help is greatly appreciated.
Click to expand...
This thread suggests replacing C301 (1uF, 50V) as well as the two you
have already changed:
http://www.plcdrives.com/forum/f34/toshiba-model-cf2765k-chassis-9010-vertical-problem-20545/

AFAICT, the jungle IC is a TA8680N. I believe it's called a "jungle"
because it's a one-chip-does-everything solution.

These datasheets may help:
http://www.datasheetarchive.com/pdf-datasheets/Datasheets-39/DSA-764764.pdf
http://www.nteinc.com/specs/7000to7099/pdf/nte7010.pdf

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
Thanks all, I thought I had already verified C301, when I went to check
it again it was bad.(I had never checked it). It was the problem, Thanks
again to all that replied.

Gary




Franc Zabkar wrote:
On Wed, 11 Nov 2009 15:36:43 -0500, "Gary L. Woodruff"
woodruffrepair@frontiernet.net> put finger to keyboard and composed:

howdy, The two caps I changed were 1.0uf and 220uf both near the
vertical IC AN5221. I am not familiar with the term jungle IC! Any and
all help is greatly appreciated.

This thread suggests replacing C301 (1uF, 50V) as well as the two you
have already changed:
http://www.plcdrives.com/forum/f34/toshiba-model-cf2765k-chassis-9010-vertical-problem-20545/

AFAICT, the jungle IC is a TA8680N. I believe it's called a "jungle"
because it's a one-chip-does-everything solution.

These datasheets may help:
http://www.datasheetarchive.com/pdf-datasheets/Datasheets-39/DSA-764764.pdf
http://www.nteinc.com/specs/7000to7099/pdf/nte7010.pdf

- Franc Zabkar
Click to expand...
 
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