Zienth Vertical Squish (How do I find and test the Capacitor

K

Kevin Cornwell

Guest
I have read Sam's FAQ and found that the problem is the vertical capacitor.
Is the cap on the circuit board on the "delicate" end of the picture tube?
I see one blue cap and I tested it with my fluke and it reads 6.4 (cold) and
the value printed on the cap is 4.7. BTW, the TV picture is not as squished
once the TV is warm. Is this the right cap to test? I tested the
capacitance by finding the solder points on the opposite side of the board
and placed my leads there. Is this the right way to test it? Or do I have
to remove it from the board for isolation reasons?

Thanks in advance!
Kevin

Model Number: SJ2775BG
Serial Number: 191-43290769

PS- If this in fact the problem, where would you guys recommed I get a
replacement cap?
 
Suggest you get a qualified service technician to service the set.
"Kevin Cornwell" <kcornwell@cox.net> wrote in message
news:KhR0b.3866$j26.3820@lakeread02...
I have read Sam's FAQ and found that the problem is the vertical
capacitor.
Is the cap on the circuit board on the "delicate" end of the picture tube?
I see one blue cap and I tested it with my fluke and it reads 6.4 (cold)
and
the value printed on the cap is 4.7. BTW, the TV picture is not as
squished
once the TV is warm. Is this the right cap to test? I tested the
capacitance by finding the solder points on the opposite side of the board
and placed my leads there. Is this the right way to test it? Or do I
have
to remove it from the board for isolation reasons?

Thanks in advance!
Kevin

Model Number: SJ2775BG
Serial Number: 191-43290769

PS- If this in fact the problem, where would you guys recommed I get a
replacement cap?
Click to expand...
 
Ok... Pulled out a Nichicon 4.7uf 315v 105 C capacitor (H9112) and it
tested bad. Any recommendations on where to find a replacement? How
critical is the voltage for match up purposes? I cannot find this
particular unit. In fact the closest I could find was a 4.7uf 400v. Help
please... :)
Kevin
 
Thanks Sam. I appreciate the informative response. (great web site too!)
Kevin

"Sam Goldwasser" <sam@saul.cis.upenn.edu> wrote in message
news:6wlltl5ldt.fsf@saul.cis.upenn.edu...
"Kevin Cornwell" <kcornwell@cox.net> writes:

Ok... Pulled out a Nichicon 4.7uf 315v 105 C capacitor (H9112) and it
tested bad. Any recommendations on where to find a replacement? How
critical is the voltage for match up purposes? I cannot find this
particular unit. In fact the closest I could find was a 4.7uf 400v.
Help
please... :)

P.S. I do assume it's a normal polarized electrolytic. If by chance
it's a non-polarized cap, then a non-polarized replacement must be used.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work.
To
contact me, please use the Feedback Form at repairfaq.org. Thanks.
Click to expand...
 
"Kevin Cornwell" <kcornwell@cox.net> writes:

Ok... Pulled out a Nichicon 4.7uf 315v 105 C capacitor (H9112) and it
tested bad. Any recommendations on where to find a replacement? How
critical is the voltage for match up purposes? I cannot find this
particular unit. In fact the closest I could find was a 4.7uf 400v. Help
please... :)
Click to expand...
That would be fine. The 105 degree C would be desirable though.

In general, an electrolytic cap can be replaced with one that is modestly
higher without any problems as long as it fits. I wouldn't go 10 times
higher but up to at least 2X is OK.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the Feedback Form at repairfaq.org. Thanks.
 
"Kevin Cornwell" <kcornwell@cox.net> writes:

Ok... Pulled out a Nichicon 4.7uf 315v 105 C capacitor (H9112) and it
tested bad. Any recommendations on where to find a replacement? How
critical is the voltage for match up purposes? I cannot find this
particular unit. In fact the closest I could find was a 4.7uf 400v. Help
please... :)
Click to expand...
P.S. I do assume it's a normal polarized electrolytic. If by chance
it's a non-polarized cap, then a non-polarized replacement must be used.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the Feedback Form at repairfaq.org. Thanks.
 
The cap I tested was ok afterall. Just a bit higher microfarad than what is
printed (4.7 vs 5.8). I would like to test the cap(s) on the vertical
output IC however I don't know exactly which IC I should be looking for. Is
this part of the main board or is it one of the smaller ones? Is there some
landmark that gives it away? Is there a website that has components
visually marked out?
Thanks again...



"Sam Goldwasser" <sam@saul.cis.upenn.edu> wrote in message
news:6wlltl5ldt.fsf@saul.cis.upenn.edu...
"Kevin Cornwell" <kcornwell@cox.net> writes:

Ok... Pulled out a Nichicon 4.7uf 315v 105 C capacitor (H9112) and it
tested bad. Any recommendations on where to find a replacement? How
critical is the voltage for match up purposes? I cannot find this
particular unit. In fact the closest I could find was a 4.7uf 400v.
Help
please... :)

P.S. I do assume it's a normal polarized electrolytic. If by chance
it's a non-polarized cap, then a non-polarized replacement must be used.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work.
To
contact me, please use the Feedback Form at repairfaq.org. Thanks.
Click to expand...
 
The cap I tested was ok afterall. Just a bit higher microfarad than what
is
printed (4.7 vs 5.8). I would like to test the cap(s) on the vertical
output IC however I don't know exactly which IC I should be looking for.
Is
this part of the main board or is it one of the smaller ones? Is there
some
landmark that gives it away? Is there a website that has components
visually marked out?
Thanks again...
Click to expand...
 
"Kevin Cornwell" <kcornwell@cox.net> wrote in message news:<koN2b.11308$j26.3577@lakeread02>...
The cap I tested was ok afterall. Just a bit higher microfarad than what
is
printed (4.7 vs 5.8). I would like to test the cap(s) on the vertical
output IC however I don't know exactly which IC I should be looking for.
Is
this part of the main board or is it one of the smaller ones? Is there
some
landmark that gives it away? Is there a website that has components
visually marked out?
Thanks again...
Click to expand...
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
The following is 2 conversations with Donal Percival and myself. With
Donalds help I was able to fix my vertical squish problem. If anyone
needs the service schematics for a Zenith Model Number: SJ2775BG, send
me a note.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Radio Shack does not carry it so I ordered it from partsexpress.com so It
may be a few days till I get back to you on how it works out. -kc

-----Original Message-----
From: Donald Percival [mailto:mad:]
Sent: Friday, September 05, 2003 3:44 AM
To: Kevin Cornwell
Subject: Re: Zienth Vertical Squish (How do I find and test the
Capacitor?)


Yes a bad cap will cause your squish problem, and no I do not sell parts.
Sorry I did not get
back to you earllier to tell you this info.
Donald

----- Original Message -----
From: "Kevin Cornwell" <kcornwell@cox.net
To: "Donald Percival" <@
Sent: Wednesday, September 03, 2003 9:12 PM
Subject: RE: Zienth Vertical Squish (How do I find and test the
Capacitor?)


Hi again Donald,
The number of the IC that is mounted to the aluminum heat sink is
IC2100,
221-550 series.

I removed and tested the following caps:

Cap. Rated mf Actual mf

C2104 100 116
C2108 4.7 4.22 <---Notice this one.
CX2105 220 257
CX2109 2200 2350
CX2110 100 110

I now believe that C2108 is the culprit. Upon closer inspection I found
that the casing where the two leads come out of the cap is distorted a
little bit. (the top of the cap looks ok though). What do you think?

Take care,
Kevin










-----Original Message-----
From: Donald Percival [mailto:mad:]
Sent: Tuesday, September 02, 2003 8:28 AM
To: Kevin Cornwell
Subject: Re: Zienth Vertical Squish (How do I find and test the
Capacitor?)


From looking at the back of the TV, the vert IC is usually on the right

side
of the TV. So in
your case it will be on the right circuit board. I don't know how that
TV
is
set up. The chip
could be twards the back of the TV on the right ciruit board, or on the
side
middle of the
board, or in the front of the board by the front of the TV. Look in
their
and see if you can
see an IC chip monted to an aluminum heat sink. If you can give me the
number on the chip.
A typical vertical output # is AN5521, but that is probably not the one
in
yours. If you can
find some numbers I can look them up in my ECG cross reference
book.Another
way to
tell wher your vert section is, look for wires coming out of the circuit
board colored green
& yellow, those wires are for vertical. They come out of the main board
and
go to the
picture tube socket. Let me know. Goodluck.:)
Donald


----- Original Message -----
From: "Kevin Cornwell" <kcornwell@cox.net
To: "Donald Percival" <@
Sent: Monday, September 01, 2003 9:59 PM
Subject: RE: Zienth Vertical Squish (How do I find and test the
Capacitor?)


Hello Donald,

I have not received the manual, however I did look for the caps you
mentioned. I did not see any C301 C302 caps. I did see some C3xxx
and
CX3xxx caps. Lots of them. I don't know which is the one. I am not
sure
which area to go to. Looking at the back of the TV, down at the
motherboard(s) I see the following: The floor of the cabinet has 2
mainboards. On the left side you would hook up the cable, rca,
s-video
and
such. On the right side the 110V power is fed. The 2 large boards
are
nearly the same size and divided up the middle towards the front of
the
TV.
The board on the left has 3 small vertical boards attached at right
angles.
Does any of this help you help me?

Thanks,
Kevin Cornwell

-----Original Message-----
From: Donald Percival [mailto:mad:]
Sent: Monday, September 01, 2003 9:07 AM
To: Kevin Cornwell
Subject: Re: Zienth Vertical Squish (How do I find and test the
Capacitor?)


Hi Kevin, its me again, sorry the numbers will start with c, ie c301,
c302
and so on.
C meaning capacitor and they or it will be on the mother board or
board
on
the board
on the bottom of the TV. The caps will not be on the delicate part of
the
picture tube,
which is the picture tube socket. Well good luck with the service
manual,
if
you have
any questions let me know.
Donald

----- Original Message -----
From: "Kevin Cornwell" <kcornwell@cox.net
To: "Donald Percival" <@
Sent: Monday, September 01, 2003 1:56 AM
Subject: RE: Zienth Vertical Squish (How do I find and test the
Capacitor?)


Thanks for the advice. However I got tired of trying to find
information
on
the net and ordered a service manual to find the vertical cap. The
manual
costs $42 but it would still be cheaper than a TV repair shop, and I
can
sell it on ebay. Anyway I will look for those numbers you mentioned
and
check the manual too. I really appreciate the response, and will
post
another note to the newsgroup when I figure it all out.

Thanks and have a great day!
Kevin C

-----Original Message-----
From: Donald Percival [mailto:mad:]
Sent: Sunday, August 31, 2003 11:51 AM
To: Kevin Cornwell
Subject: Re: Zienth Vertical Squish (How do I find and test the
Capacitor?)


Hi Kevin, the best way to check any electrical part is out of the
ciruit
board.When its in the
circuit board, your reading other parts too. Anyways to find the
cap,and
most of the time its
a bad cap or two, find the number of the vertical output. If its say
300
or
302 or something
along those lines, your caps will be numbered with the same prefix,
such
as
301 302 .303.
Those are the caps for the vertical section, well I hope this helps,
and
good luck.
Donald


----- Original Message -----
From: "Kevin Cornwell" <kcornwell@cox.net
Newsgroups: sci.electronics.repair
Sent: Wednesday, August 20, 2003 2:58 PM
Subject: Zienth Vertical Squish (How do I find and test the
Capacitor?)


I have read Sam's FAQ and found that the problem is the vertical
capacitor.
Is the cap on the circuit board on the "delicate" end of the
picture
tube?
I see one blue cap and I tested it with my fluke and it reads 6.4
(cold)
and
the value printed on the cap is 4.7. BTW, the TV picture is not
as
squished
once the TV is warm. Is this the right cap to test? I tested the
capacitance by finding the solder points on the opposite side of
the
board
and placed my leads there. Is this the right way to test it? Or
do
I
have
to remove it from the board for isolation reasons?

Thanks in advance!
Kevin

Model Number: SJ2775BG
Serial Number: 191-43290769

PS- If this in fact the problem, where would you guys recommed I
get
a
Ř > > > > replacement cap?
Click to expand...




+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Other email conversation with Donald:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Yes a bad cap will cause your squish problem, and no I do not sell
parts.
Sorry I did not get
back to you earllier to tell you this info.
Donald

----- Original Message -----
From: "Kevin Cornwell" <kcornwell@cox.net>
To: "Donald Percival" <@>
Sent: Wednesday, September 03, 2003 9:12 PM
Subject: RE: Zienth Vertical Squish (How do I find and test the
Capacitor?)


Hi again Donald,
The number of the IC that is mounted to the aluminum heat sink is IC2100,
221-550 series.

I removed and tested the following caps:

Cap. Rated mf Actual mf

C2104 100 116
C2108 4.7 4.22 <---Notice this one.
CX2105 220 257
CX2109 2200 2350
CX2110 100 110

I now believe that C2108 is the culprit. Upon closer inspection I found
that the casing where the two leads come out of the cap is distorted a
little bit. (the top of the cap looks ok though). What do you think?

Take care,
Kevin










-----Original Message-----
From: Donald Percival [mailto:mad:]
Sent: Tuesday, September 02, 2003 8:28 AM
To: Kevin Cornwell
Subject: Re: Zienth Vertical Squish (How do I find and test the
Capacitor?)


From looking at the back of the TV, the vert IC is usually on the right
side
of the TV. So in
your case it will be on the right circuit board. I don't know how that TV
is
set up. The chip
could be twards the back of the TV on the right ciruit board, or on the
side
middle of the
board, or in the front of the board by the front of the TV. Look in their
and see if you can
see an IC chip monted to an aluminum heat sink. If you can give me the
number on the chip.
A typical vertical output # is AN5521, but that is probably not the one in
yours. If you can
find some numbers I can look them up in my ECG cross reference
book.Another
way to
tell wher your vert section is, look for wires coming out of the circuit
board colored green
& yellow, those wires are for vertical. They come out of the main board
and
go to the
picture tube socket. Let me know. Goodluck.:)
Donald


----- Original Message -----
From: "Kevin Cornwell" <kcornwell@cox.net
To: "Donald Percival" <@
Sent: Monday, September 01, 2003 9:59 PM
Subject: RE: Zienth Vertical Squish (How do I find and test the
Capacitor?)


Hello Donald,

I have not received the manual, however I did look for the caps you
mentioned. I did not see any C301 C302 caps. I did see some C3xxx and
CX3xxx caps. Lots of them. I don't know which is the one. I am not
sure
which area to go to. Looking at the back of the TV, down at the
motherboard(s) I see the following: The floor of the cabinet has 2
mainboards. On the left side you would hook up the cable, rca, s-video
and
such. On the right side the 110V power is fed. The 2 large boards are
nearly the same size and divided up the middle towards the front of the
TV.
The board on the left has 3 small vertical boards attached at right
angles.
Does any of this help you help me?

Thanks,
Kevin Cornwell

-----Original Message-----
From: Donald Percival [mailto:mad:]
Sent: Monday, September 01, 2003 9:07 AM
To: Kevin Cornwell
Subject: Re: Zienth Vertical Squish (How do I find and test the
Capacitor?)


Hi Kevin, its me again, sorry the numbers will start with c, ie c301,
c302
and so on.
C meaning capacitor and they or it will be on the mother board or board
on
the board
on the bottom of the TV. The caps will not be on the delicate part of
the
picture tube,
which is the picture tube socket. Well good luck with the service
manual,
if
you have
any questions let me know.
Donald

----- Original Message -----
From: "Kevin Cornwell" <kcornwell@cox.net
To: "Donald Percival" <@
Sent: Monday, September 01, 2003 1:56 AM
Subject: RE: Zienth Vertical Squish (How do I find and test the
Capacitor?)


Thanks for the advice. However I got tired of trying to find
information
on
the net and ordered a service manual to find the vertical cap. The
manual
costs $42 but it would still be cheaper than a TV repair shop, and I
can
sell it on ebay. Anyway I will look for those numbers you mentioned
and
check the manual too. I really appreciate the response, and will post
another note to the newsgroup when I figure it all out.

Thanks and have a great day!
Kevin C

-----Original Message-----
From: Donald Percival [mailto:mad:]
Sent: Sunday, August 31, 2003 11:51 AM
To: Kevin Cornwell
Subject: Re: Zienth Vertical Squish (How do I find and test the
Capacitor?)


Hi Kevin, the best way to check any electrical part is out of the
ciruit
board.When its in the
circuit board, your reading other parts too. Anyways to find the
cap,and
most of the time its
a bad cap or two, find the number of the vertical output. If its say
300
or
302 or something
along those lines, your caps will be numbered with the same prefix,
such
as
301 302 .303.
Those are the caps for the vertical section, well I hope this helps,
and
good luck.
Donald


----- Original Message -----
From: "Kevin Cornwell" <kcornwell@cox.net
Newsgroups: sci.electronics.repair
Sent: Wednesday, August 20, 2003 2:58 PM
Subject: Zienth Vertical Squish (How do I find and test the
Capacitor?)


I have read Sam's FAQ and found that the problem is the vertical
capacitor.
Is the cap on the circuit board on the "delicate" end of the picture
tube?
I see one blue cap and I tested it with my fluke and it reads 6.4
(cold)
and
the value printed on the cap is 4.7. BTW, the TV picture is not as
squished
once the TV is warm. Is this the right cap to test? I tested the
capacitance by finding the solder points on the opposite side of the
board
and placed my leads there. Is this the right way to test it? Or do
I
have
to remove it from the board for isolation reasons?

Thanks in advance!
Kevin

Model Number: SJ2775BG
Serial Number: 191-43290769

PS- If this in fact the problem, where would you guys recommed I get
a
replacement cap?
Click to expand...
 
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