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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

Zenith Sentry 2 TV



 
 
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  #1  
Old August 20th 03, 08:13 PM
Patch
external usenet poster
 
Posts: n/a
Default Zenith Sentry 2 TV


"glasnostJDC" JDC@(NO SPAM)cnyconnect.net wrote in message
...
Hello, I have a Zenith Sentry 2 model sj2063s5 that I picked up for
free. I've repaired monitor's and TV's before but nothing so far with this
problem. If I leave the TV off for a day when I turn it on it shows a good
picture for about 30 seconds, then horizontal lines of distrotion distort
the picture (look like this:
---___________
---___________
---___________
there distrotions of the image being put on screen) and any graghic menus.
There is a high pitched noise from the unit, If I turn it right back on

the
picture still has distrotion. I did a light hit test for joints and it
didn't affect it, I still have to go through and check joints (will do
soon). If I'm right this is a problem in the verticle circuit of this TV?
Really all I'm woundering is a direction to go and any one who may have

had
a similar problem with this unit. I've not found exactly this problem on a
group search through google. Any help and information would be great and

I
thank all who reply.
--
-glasnostJDC


Sounds like the Horizontal oscillator is going off frequency. Most likely

a bad electrolytic cap. If you have an ESR meter you might be able to locate
it.


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  #2  
Old August 20th 03, 10:46 PM
David
external usenet poster
 
Posts: n/a
Default Zenith Sentry 2 TV

Has been addressed many times here. Do a Google groups search for
horizontal sawtooth and Zenith (possibly search by chassis or module
number). C2212 maybe? a 22uf on the 9v line to the jungle ic.

Of if it is really bright, the classic way the Zenith tubes short
internally.

A specific chassis number and year of manufacture will help a lot in
narrowing down other possibilities. Model numbers mean very little
for tv repair.

David

"glasnostJDC" JDC@(NO SPAM)cnyconnect.net wrote in message . ..
Hello, I have a Zenith Sentry 2 model sj2063s5 that I picked up for
free. I've repaired monitor's and TV's before but nothing so far with this
problem. If I leave the TV off for a day when I turn it on it shows a good
picture for about 30 seconds, then horizontal lines of distrotion distort
the picture (look like this:
---___________
---___________
---___________
there distrotions of the image being put on screen) and any graghic menus.
There is a high pitched noise from the unit, If I turn it right back on the
picture still has distrotion. I did a light hit test for joints and it
didn't affect it, I still have to go through and check joints (will do
soon). If I'm right this is a problem in the verticle circuit of this TV?
Really all I'm woundering is a direction to go and any one who may have had
a similar problem with this unit. I've not found exactly this problem on a
group search through google. Any help and information would be great and I
thank all who reply.

  #3  
Old August 21st 03, 03:06 AM
David
external usenet poster
 
Posts: n/a
Default Zenith Sentry 2 TV

So please give more details. Which is brighter? Is one too bright or too
dark?
That set may have a limited service menu, early Zenith service menus did
have eeprom value settings for rf brightness and video brightness.

If the video input is low, you could have a weak capacitor in the video
path. Too weak and the picture will roll.

David

glasnostJDC JDC@(NO SPAM)cnyconnect.net wrote in message
...
Oh for starters the modual number is 9-1118 and was made August 1991
the chassis I've read is the same as the model # for this series? I tryed

to
find it any way but no such luck. My last major problem is brightness
differences between line level and coax inputs. Any suggestions? The
capacitor was the fix (C2212) for my posted problem. But for this
brightness difference problem I'm not sure, I've seen something posted
before but it was all dead ends. I've got a couple of work arounds but I
want to know if there is a knowen componant or componants that break down
that cause that problem. Any help would be great and thanks to all agian

who
have helped this far.

-glasnostJDC

"David" wrote in message
om...
Has been addressed many times here. Do a Google groups search for
horizontal sawtooth and Zenith (possibly search by chassis or module
number). C2212 maybe? a 22uf on the 9v line to the jungle ic.

Of if it is really bright, the classic way the Zenith tubes short
internally.

A specific chassis number and year of manufacture will help a lot in
narrowing down other possibilities. Model numbers mean very little
for tv repair.

David

"glasnostJDC" JDC@(NO SPAM)cnyconnect.net wrote in message

. ..
Hello, I have a Zenith Sentry 2 model sj2063s5 that I picked up for
free. I've repaired monitor's and TV's before but nothing so far with

this
problem. If I leave the TV off for a day when I turn it on it shows a

good
picture for about 30 seconds, then horizontal lines of distrotion

distort
the picture (look like this:
---___________
---___________
---___________
there distrotions of the image being put on screen) and any graghic

menus.
There is a high pitched noise from the unit, If I turn it right back

on
the
picture still has distrotion. I did a light hit test for joints and it
didn't affect it, I still have to go through and check joints (will do
soon). If I'm right this is a problem in the verticle circuit of this

TV?
Really all I'm woundering is a direction to go and any one who may

have
had
a similar problem with this unit. I've not found exactly this problem

on
a
group search through google. Any help and information would be great

and I
thank all who reply.






  #4  
Old August 22nd 03, 05:12 PM
glasnostJDC
external usenet poster
 
Posts: n/a
Default Zenith Sentry 2 TV

If the brightness is adjusted correctly for the line level input, the
coax input will be darker by a large amount. Is there a setting for this in
the serivce menu, how is it accessed on this model? The screen does not roll
at all. Thank you very much for all your help so far.

-glasnostJDC

"David" wrote in message
...
So please give more details. Which is brighter? Is one too bright or too
dark?
That set may have a limited service menu, early Zenith service menus did
have eeprom value settings for rf brightness and video brightness.

If the video input is low, you could have a weak capacitor in the video
path. Too weak and the picture will roll.

David

glasnostJDC JDC@(NO SPAM)cnyconnect.net wrote in message
...
Oh for starters the modual number is 9-1118 and was made August 1991
the chassis I've read is the same as the model # for this series? I

tryed
to
find it any way but no such luck. My last major problem is brightness
differences between line level and coax inputs. Any suggestions? The
capacitor was the fix (C2212) for my posted problem. But for this
brightness difference problem I'm not sure, I've seen something posted
before but it was all dead ends. I've got a couple of work arounds but I
want to know if there is a knowen componant or componants that break

down
that cause that problem. Any help would be great and thanks to all agian

who
have helped this far.

-glasnostJDC

"David" wrote in message
om...
Has been addressed many times here. Do a Google groups search for
horizontal sawtooth and Zenith (possibly search by chassis or module
number). C2212 maybe? a 22uf on the 9v line to the jungle ic.

Of if it is really bright, the classic way the Zenith tubes short
internally.

A specific chassis number and year of manufacture will help a lot in
narrowing down other possibilities. Model numbers mean very little
for tv repair.

David

"glasnostJDC" JDC@(NO SPAM)cnyconnect.net wrote in message

. ..
Hello, I have a Zenith Sentry 2 model sj2063s5 that I picked up for
free. I've repaired monitor's and TV's before but nothing so far

with
this
problem. If I leave the TV off for a day when I turn it on it shows

a
good
picture for about 30 seconds, then horizontal lines of distrotion

distort
the picture (look like this:
---___________
---___________
---___________
there distrotions of the image being put on screen) and any graghic

menus.
There is a high pitched noise from the unit, If I turn it right

back
on
the
picture still has distrotion. I did a light hit test for joints and

it
didn't affect it, I still have to go through and check joints (will

do
soon). If I'm right this is a problem in the verticle circuit of

this
TV?
Really all I'm woundering is a direction to go and any one who may

have
had
a similar problem with this unit. I've not found exactly this

problem
on
a
group search through google. Any help and information would be

great
and I
thank all who reply.









  #5  
Old August 22nd 03, 06:13 PM
glasnostJDC
external usenet poster
 
Posts: n/a
Default Zenith Sentry 2 TV

If the brightness is adjusted correctly for the line level input, the
coax input will be darker by a large amount. Is there a setting for this in
the serivce menu, how is it accessed on this model? The screen does not roll
at all. Thank you very much for all your help so far.

-glasnostJDC

"David" wrote in message
...
So please give more details. Which is brighter? Is one too bright or too
dark?
That set may have a limited service menu, early Zenith service menus did
have eeprom value settings for rf brightness and video brightness.

If the video input is low, you could have a weak capacitor in the video
path. Too weak and the picture will roll.

David




 




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