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 > > > > **************************************************************************** * > The Tech Address Book: > http://www.tech-assist.org/secure/tip/contact.html > Add a Repair Tip Here, or Change/Remove your Email Address: > http://www.tech-assist.org/secure/tip/main.html > Lost Password: > http://www.tech-assist.org and select "Lost your Login Info?". > Email Archives: > //www.freelists.org/archives/techassist/ ***************************************************************************** The Tech Address Book: http://www.tech-assist.org/secure/tip/contact.html Add a Repair Tip Here, or Change/Remove your Email Address: http://www.tech-assist.org/secure/tip/main.html Lost Password: http://www.tech-assist.org and select "Lost your Login Info?". Email Archives: //www.freelists.org/archives/techassist/