[TechAssist] Re: Panasonic CT-27G21U Chassis AEDP270 Shuts off (FIXED)?
- From: "Shaun" <satguy@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 3 Mar 2005 16:23:54 -0700
Found the service manual. The LA7836 has 2 vcc's, vcc1 comes from source 10
which is feed off pin 7 of the flyback and has C567 (1000 uf 35 volt) which
is 16.0 volt source and is clean no ripple. Vcc2 is source 9 (25.8 volt
source) which has 2 caps on the line C579 (220 uf) and C558 (220 uf). When I
scope the vertical IC everything is right on the money. If this tv had a
vertical linearity adjustment that's all it would take. I am getting all
these voltages from a Sams Photofact 3803.
Basically it looks ok except for when I adjust the vertical height to fill
the top completely then on the bottom it cuts off things like on CNN the
scrolling words are completely cut off on the bottom.
Shaun
Advanced Electronics
224 West Riverview Ave.
Fort Morgan, CO 80701
----- Original Message -----
From: "Shaun" <satguy@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, March 03, 2005 3:29 PM
Subject: [TechAssist] Re: Panasonic CT-27G21U Chassis AEDP270 Shuts off
(FIXED)?
> On the board pin 8 of flyback goes to R552 then to C581 (220 uf 16v) which
I
> checked and is good, but I still can't find C459. It's not really bowed
> allot on the sides just a little but my b+ seems to check ok but I don't
> have the service manual either I will look and see if I can find one.
Thanks
> for all your help.
>
>
> Shaun
>
> Advanced Electronics
> 224 West Riverview Ave.
> Fort Morgan, CO 80701
> ----- Original Message -----
> From: "Webster's TV" <webstertv@xxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, March 03, 2005 2:16 PM
> Subject: [TechAssist] Re: Panasonic CT-27G21U Chassis AEDP270 Shuts off
> (FIXED)?
>
>
> > Shaun,
> >
> > C459 should be on the voltage source line(vcc) to the Vert. IC, could be
> > located anywhere between Vert. IC and the Flyback. I don't have the
exact
> > schematic for your chassis, but have several that are close and the 26v
> > (vcc) to Vert. IC originates from pin 8 of flyback. I came across
another
> > vert. tip I have written down, but this was for only 3" of vert.
> deflection,
> > that cause was C403(2.2m) off of pin 40 of IC101. You say you have a
bowed
> > in side as well, maybe a regulator problem is causing all your problems.
> >
> > Dan Webster
> > Webster's TV
> > Shullsburg, Wi.
> >
> > ----- Original Message -----
> > From: "Shaun" <satguy@xxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Thursday, March 03, 2005 2:29 PM
> > Subject: [TechAssist] Re: Panasonic CT-27G21U Chassis AEDP270 Shuts off
> > (FIXED)?
> >
> >
> > > Dan, I replaced all the caps you listed except C459 I can't find it on
> the
> > > board. The other thing is the picture is bowed in a little on the side
> as
> > > well. I have checked and replaced several other caps as well in the
> power
> > > supply but still not enough height on the top.
> > >
> > > Shaun
> > >
> > > Advanced Electronics
> > > 224 West Riverview Ave.
> > > Fort Morgan, CO 80701
> > > ----- Original Message -----
> > > From: "Webster's TV" <webstertv@xxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Thursday, March 03, 2005 12:40 PM
> > > Subject: [TechAssist] Re: Panasonic CT-27G21U Chassis AEDP270 Shuts
off
> > > (FIXED)?
> > >
> > >
> > > > Shaun,
> > > >
> > > > Usually C451 & C455 around the Vert. IC cause most height and
> linearity
> > > > problems. Looks like there's four other caps in that circuit you may
> > want
> > > to
> > > > check, if those two don't solve your problem, C452, C453, C454, and
> > C459.
> > > >
> > > > HTH
> > > > Dan Webster
> > > > Webster's TV
> > > > Shullsburg,
Wi.
> > > >
> > > > ----- Original Message -----
> > > > From: "Shaun" <satguy@xxxxxxxxxxxxx>
> > > > To: <techassist@xxxxxxxxxxxxx>
> > > > Sent: Thursday, March 03, 2005 1:08 PM
> > > > Subject: [TechAssist] Re: Panasonic CT-27G21U Chassis AEDP270 Shuts
> off
> > > > (FIXED)?
> > > >
> > > >
> > > > > Yep you guys where right found a broken trace on the relay and now
> it
> > is
> > > > > staying on. I also noticed the vertical height is too far down on
> the
> > > > > bottom, if I try to adjust it with the pot it pulls it down too
much
> > > from
> > > > > the top. I am guessing bad caps in the vertical but I already
> replaced
> > > > most
> > > > > of them near the vertical IC are there any others that I am
missing?
> > > > >
> > > > > Shaun
> > > > >
> > > > > Advanced Electronics
> > > > > 224 West Riverview Ave.
> > > > > Fort Morgan, CO 80701
> > > > > ----- Original Message -----
> > > > > From: "Webster's TV" <webstertv@xxxxxxxx>
> > > > > To: <techassist@xxxxxxxxxxxxx>
> > > > > Sent: Thursday, March 03, 2005 11:44 AM
> > > > > Subject: [TechAssist] Re: Panasonic CT-27G21U Chassis AEDP270
Shuts
> > off
> > > > >
> > > > >
> > > > > > Shaun,
> > > > > >
> > > > > > Beings the menu is coming back on when the set comes back on,
that
> > > means
> > > > > its
> > > > > > lost AC. I've had problems with broken solder connections on the
> > relay
> > > > > > causing this.
> > > > > >
> > > > > > HTH
> > > > > > Dan
Webster
> > > > > > Webster's
TV
> > > > > >
Shullsburg,
> > Wi.
> > > > > >
> > > > > > ----- Original Message -----
> > > > > > From: "Shaun" <satguy@xxxxxxxxxxxxx>
> > > > > > To: "tech" <techassist@xxxxxxxxxxxxx>
> > > > > > Sent: Thursday, March 03, 2005 12:03 PM
> > > > > > Subject: [TechAssist] Panasonic CT-27G21U Chassis AEDP270 Shuts
> off
> > > > > >
> > > > > >
> > > > > > > This Panasonic CT-27G21U will sometimes play for a couple
> minutes
> > > then
> > > > > > shut
> > > > > > > off by itself and later come back on by itself. When it comes
> back
> > > on
> > > > it
> > > > > > > will have the main menu on the screen, then it might play for
> > hours
> > > or
> > > > > > only
> > > > > > > minutes again. I have replaced D805 and C805 in the power
supply
> > but
> > > > > find
> > > > > > no
> > > > > > > other bad parts or loose connections. Has anyone seen this
> problem
> > > in
> > > > a
> > > > > > > Panasonic before?
> > > > > > >
> > > > > > > Shaun
> > > > > > >
> > > > > > > Advanced Electronics
> > > > > > > 224 West Riverview Ave.
> > > > > > > Fort Morgan, CO 80701
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>
> --------------------------------------------------------------------------
> > > > > > ---
> > > > > > > This Email List is viewable to the Public.
> > > > > > > Lost Password:
> > > > > > > http://www.tech-assist.org and select "Login Problems?".
> > > > > > > Email Archives:
> > > > > > > //www.freelists.org/archives/techassist/
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>
> --------------------------------------------------------------------------
> > > > > ---
> > > > > > This Email List is viewable to the Public.
> > > > > > Lost Password:
> > > > > > http://www.tech-assist.org and select "Login Problems?".
> > > > > > Email Archives:
> > > > > > //www.freelists.org/archives/techassist/
> > > > >
> > > >
> > >
> >
>
> --------------------------------------------------------------------------
> > > > ---
> > > > > This Email List is viewable to the Public.
> > > > > Lost Password:
> > > > > http://www.tech-assist.org and select "Login Problems?".
> > > > > Email Archives:
> > > > > //www.freelists.org/archives/techassist/
> > > > >
> > > >
> > >
> >
>
> --------------------------------------------------------------------------
> > > ---
> > > > This Email List is viewable to the Public.
> > > > Lost Password:
> > > > http://www.tech-assist.org and select "Login Problems?".
> > > > Email Archives:
> > > > //www.freelists.org/archives/techassist/
> > >
> >
>
> --------------------------------------------------------------------------
> > ---
> > > This Email List is viewable to the Public.
> > > Lost Password:
> > > http://www.tech-assist.org and select "Login Problems?".
> > > Email Archives:
> > > //www.freelists.org/archives/techassist/
> > >
> >
>
> --------------------------------------------------------------------------
> ---
> > This Email List is viewable to the Public.
> > Lost Password:
> > http://www.tech-assist.org and select "Login Problems?".
> > Email Archives:
> > //www.freelists.org/archives/techassist/
>
> --------------------------------------------------------------------------
---
> This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
> Lost Password: http://www.tech-assist.org and select "Login Problems?".
> Email Archives: //www.freelists.org/archives/techassist/
-----------------------------------------------------------------------------
This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
Lost Password: http://www.tech-assist.org and select "Login Problems?".
Email Archives: //www.freelists.org/archives/techassist/
Other related posts:
