Question about RCA Televison & Video
No filement on rca f36668 pix tube
I assume you have either looked into the rear cover, or removed it. The worst case scenario is an open heater (filament) in the crt itself although this is not real common. If you can use an ohmmeter/continuity tester you can see on the crt pc board which pins are the filaments. Pull the socket off and check for low resistance between these two crt pins if low then odds are the filament is ok. The next thing is to check the solder at the filament connections on the crt board as often you will find "ring cracks" around them and they need re-soldering. The filament circuit is supplied from the IHVT (flyback). Generally with the socket unplugged from the tube you should find low resistance across these two connections also. You read back through the transformer winding if it is ok. If it tests open you may have an open fuse resistor or a bad solder connection at the flyback. The filament (heater) terminals are usually labeled on the main board at the transformer.
Posted on Nov 19, 2009
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Posted on Jan 02, 2017
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