Quote:
Originally Posted by vortalexfan
The picture went to a black blank screen, and no audio.
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Is there HV? A problem in the tuner or IF will still leave a raster if the brightness is midrange or higher.
Maybe tapping around the tuner is causing a sympathetic vibration somewhere in the sweep section and restoring deflection and/or HV.
Again, troubleshoot this forgetting everything you know about the TV (other than it worked after being recapped).
Quote:
Originally Posted by vortalexfan
Maybe I should try checking those tubes and replacing them with new ones?
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I'm not one of those guys that says never use a tube tester; I have several and find them useful to a degree. But what you need instead of a tube tester at this point is a good meter and a good scope (and an iso trans if it's a hot chassis).
I would start with the basics. Check the HV. Arc the cap of the HV rect to the cage. Scope the horiz drive to the horiz output. Check DC voltages at the CRT. If it has raster, scope the video from the detector back through the IFs.
A signal generator or a dedicated device like a B&K 1070/1077B or Sencore VA48/62 will allow you substitute drive and low level signals to see what's good and what's not.
John