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 > > > > > > > > > > > > > > > **************************************************************************** > > * > > > 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/ > > > __________________________________ > Do you Yahoo!? > The New Yahoo! Search - Faster. Easier. Bingo. > http://search.yahoo.com > **************************************************************************** * > 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/