That 12v to pin 1 is used to run the vert oscillator, I've seen a 0.2 volt change cause vert jittering, varying that voltage can cause shrinkage and possibly collapse, verify it is EXACTLY what it's supposed to be. Also , check trace continuity, especially on pins 3 , 4, and 5 as these components are for the vert ramp generator. Damon Brunger damon101@xxxxxxxxxxxxxx Telrad Electronic Services Ft Wayne, IN 46815 ----- Original Message ----- From: "Larry" <schntv@xxxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Tuesday, June 25, 2002 3:45 PM Subject: [TechAssist] Panasonic CTP-3189 apedc214 no vertical > > help please! I know this sounds easy but, > I dont understand what I am missing. > I have replaced the vert. IC, 2 times, LA7838. > I have 12 v to pin 1 and 28v to pin 8 and 13, supply voltages. > I have vertical drive pulse at Pin 2 input. > lifted and checked 12 resistors and checked lytics. > yoke return path checks continuity. > cant get any vertical output. > I even injected drive to pin 2 and still nothing. > The schematic shows no voltages for most of the pins. > I dont know where to turn. > Thank you, > Larry > > > > -- > Schneider TV & Electronic Inc. > 5415 N. Wooster ave. > Dover, Ohio 44622 www.geocities.com/schntv2000/ > 330-343-0768 FCC. first class & Extra class K8WLY > ------------------------------------------ > To REMOVE your email address, click here: > http://www.tech-assist.org/unsubb.html > To CHANGE your email address, click here: > http://www.tech-assist.org/change.html > ------------------------------------------ > ***NEW*** Tips Added Instantly!!!*** > Submit Repair Tips here: > http://www.tech-assist.org/secure/tip/ > ------------------------------------------ To REMOVE your email address, click here: http://www.tech-assist.org/unsubb.html To CHANGE your email address, click here: http://www.tech-assist.org/change.html ------------------------------------------ ***NEW*** Tips Added Instantly!!!*** Submit Repair Tips here: http://www.tech-assist.org/secure/tip/