[TechAssist] Re: Panasonic CT27G20T chassis AEDP246 series NA3D No Vertical
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 23 Oct 2003 15:12:20 -0400
I just finishing repairing a 13" Sansui TV which had a vertical
deflection problem. I replaced the output IC plus caps, and a zener
diode but still had intermittant deflection. Then I needed to clean the
resin off the board so I could see the traces better and from then on,
the deflection worked fine. It's been running for a few days now ok.
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
"John @ Myers TV" wrote:
>
> This is a Long shot; One of my worst vertical problems was the rosin on the
> board. Onece we cleaned the board, the problem dissapeared.
>
> Go Figure
>
> John Myers
> Myers TV Service Co. Since 1984
> Alliance, OH
> Voice: 330-821-6545
> myerstv@xxxxxxxx
> http://members.ebay.com/aboutme/tvguy07/
> http://members.ebay.com/aboutme/threads_r_us/
>
> ----- Original Message -----
> From: <tvservice@xxxxxxxxxxxxx>
> To: "Tech-Assist" <techassist@xxxxxxxxxxxxx>
> Sent: October 23, 2003 10:51 AM
> Subject: [TechAssist] Panasonic CT27G20T chassis AEDP246 series NA3D No
> Vertical
>
> > OK Group
> > Please tell me what I am NOT doing
> > This set came from another shop with no vertical deflection
> > Have relaced...
> > IC451 LA7836
> > D451 NTE552
> > D557 5.1 volt zener
> > D545 12 volt zener
> > C451 220mfd
> > C455 100mfd
> > C457 .1mfd
> > C453 2.2mfd
> > C452 1mfd
> > All resistors are within tolerance. IC451 voltages are...
> > Pin 1 +12.3 volt VCC1
> > Pin 2 4.4 volt with .3v 5ms input should be 4.4v (suspect low caused
> by
> > IC not working) or maybe IC101 jungle bad??
> > Pin 3 6 volt (size)
> > Pin 4 gnd
> > Pin 5 11 volt schem says 6 volt (ramp gen)
> > Pin 6 .3 volt schem says 6.5 v (drive/feedback)
> > Pin 7 +26 volt VCC2
> > Pin 8 0 schem says 2.6 v (pump up)
> > Pin 9 n/c 2.7v
> > Pin10 gnd
> > Pin11 .5 volt schem says 15.4 v (output)
> > Pin12 26 volt
> > Pin13 5.1 volt
> > Have also subbed yoke
> > still no Vertical deflection
> >
> > Please any advice appreciated
> >
> > Robert
> > tvservice@xxxxxxxxxxxxx
> > H & H Electronics Inc
> > Dallas, TX
> >
> >
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