[TechAssist] Panasonic PT-51G4CA
- From: "Electronics Service" <electronic.service@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 16 May 2003 13:48:06 -1000
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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