[TechAssist] Re: Panasonic PT-51G4CA

  • From: "Electronics Service" <electronic.service@xxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Tue, 20 May 2003 13:17:39 -1000


Aloha Techs,

FBT is on back order. For temporary fix,
I took 32 volts off the sound Power supply and then adjusted vertical
settings.

So far so good.

Thanks for the inputs.

Aloha and thanks,

Kahuna
----- Original Message -----
From: "Frank Luu" <fkluu@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, May 19, 2003 6:49 AM
Subject: [TechAssist] Re: Panasonic PT-51G4CA


>
> 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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