|
'taint the flyback - most likely a filter cap in the B+, particularly the cap(s) feeding the horizontal driver/output and boost filter. Those Zenith flys usually arced internally when they fail, causing snivets and tearing in the picture.
What signal source are you using? RF Modulators in VCRs can cause this, as well as your humble cross-hatch generator.
I've also seen bad IF cables cause jailbars - usually the result of someone jerking too hard when removing them. Really bad on lowband VHF, which is what we use with most modulated signals now (Channels 3 or 4). It could be an IF cable isn't plugged in all the way , leaving a ground loop.
Check the caps first, then the IF Cables.
Cheers,
__________________
Brian
USN RET 22YRS (Avionics/Cal)
CET-Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
|