[TechAssist] Re: Panasonic PT-51G4CA
- From: Frank Luu <fkluu@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 19 May 2003 09:49:41 -0700 (PDT)
HI:
If the vertical fluctuates depend on the brightness
level then you may have to check ripple on B+ and all
power supplies. Some of the filter capacitors may be
bad.
Frank Luu
AF Electronics
Austin,TX
--- tvservice@xxxxxxxxxxxxx wrote:
>
> Why not substitute a Bias voltage from external
> source?
> Robert
> tvservice@xxxxxxxxxxxxx
> H & H Electronics Inc
> Dallas, TX
> ----- Original Message -----
> From: "Electronics Service"
> <electronic.service@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, May 16, 2003 6:48 PM
> Subject: [TechAssist] Panasonic PT-51G4CA
>
>
> >
> > Aloha Techs,
> >
> > This projection TV's vertical stretches out
> intermittently .I discovered
> that on LA7838,pin 6,ramp generator input varies its
> voltage everytime the
> vertical stretches.
> >
> > I traced that bias voltage coming from pin 12 of
> FBT varying from 120vdc
> to 40vdc,when vetical stretches.
> >
> > Normal vertical size happens at 40vdc on pin 12 of
> FBT.
> >
> > I am about to change the flyback,$86.00 ouch!
> >
> > Any advice before I proceed?
> >
> > Have replaced la7838,q1571,q1572 and all the
> electrolytics around la7838
> and associated electrolytics.
> >
> > Aloha and mahalo,
> > Kahuna
> >
> >
> >
> >
>
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