[TechAssist] Re: Panasonic CT-27G21U Chassis AEDP270 Shuts off (FIXED)?
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 03 Mar 2005 18:29:21 -0500
Is the vertical centering adjustments not in the service menu?
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
Shaun wrote:
> 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
>>>>>>>>
>>>>>>>
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