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NotTaR of Television Sets : No picture/dark picture/erratic picture
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1994-2007, Samuel M. Goldwasser. All Rights Reserved. Reproduction of this document in whole or in part is permitted if both of the following conditions are satisfied: 1. This notice is included in its entirety at the beginning. 2. There is no charge except to cover the costs of copying.
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If everything else works - there is sound and high voltage (static on the
screen) - but there is no picture (including no on-screen menus), this limits
the likely area of problems is the video output circuitry or CRT filament
connections. Check to see if the CRT filaments are glowing. If they are
not glowing, check for bad soldering on the CRT neck board and around
the flyback transformer.
Where the picture is erratic - coming and going entirely or changing brightness
suddenly, with power off, remove the picture tube socket (carefully!) and
clean the pins with fine sandpaper and use contact cleaner on the socket.
This source of bad connections can result in a variety of erratic symptoms.
Check for bad solder connections on the CRT neck board.