[TechAssist] Re: Panasonic PT-51G4CA

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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