jcmorrisii
Professional
Hello friends, sadly my Windy is suffering from vertical collapse. I know these PB6643-1 are prone to failure and eating HOTS but damn if it wasn't an amazing picture when working right! After powering on, the screen would increasing shrink as it continued to warm up. After 30min or so the screen would hold at a very small size and shake horribly when any explosions happened on screen etc.
So I have replaced every electrolytic capacitor on board (including filter cap) and the Vertical IC and HOT (LA7838 and C5143 respectively). Nothing looks suspect, no lifted pad/cut traces etc. There are hot spots on board where the vertical and HOT sections are (darker color PCB from heat).
Now When I power on, there is nothing but a single small vertical line going up the center of the screen (Tate ).
So I thought, well maybe one of the "new" ICs was bad so I put back in the original LA7838, test, same issue. I then replace the original HOT, test, same issue occurs
Now Im at a loss, and hoping someone can provide some input as to why I am now suffering full vertical collapse and where to go from here?
I have some spare Nanao MS9s I could splice in if I had the right yoke connectors but was really hoping to save this chassis! When working it had a PERFECT picture, and this would be the second PB6643 going into a box in the closet if I cant get it running
So I have replaced every electrolytic capacitor on board (including filter cap) and the Vertical IC and HOT (LA7838 and C5143 respectively). Nothing looks suspect, no lifted pad/cut traces etc. There are hot spots on board where the vertical and HOT sections are (darker color PCB from heat).
Now When I power on, there is nothing but a single small vertical line going up the center of the screen (Tate ).
So I thought, well maybe one of the "new" ICs was bad so I put back in the original LA7838, test, same issue. I then replace the original HOT, test, same issue occurs
Now Im at a loss, and hoping someone can provide some input as to why I am now suffering full vertical collapse and where to go from here?
I have some spare Nanao MS9s I could splice in if I had the right yoke connectors but was really hoping to save this chassis! When working it had a PERFECT picture, and this would be the second PB6643 going into a box in the closet if I cant get it running