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Picture Tube

Picture Tube

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Picture Tube

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Presentation Transcript

  1. Picture Tube

  2. Other names • CRT cathode ray tube • Screen • Picture tube • Picture bulb

  3. Materials used • Glass • Phosphor • Stainless plate • Steel • Iron • Tungsten • Aluminum

  4. Television Phosphor number designation • P 22 designated for color • P 4 for black and white • P 7 greenish-yellow light output • P 1 CRT for oscilloscope • P 11 for photographic application that emit blue light

  5. Worldwide type designation system (WTDS) • Type A – for television • Type M – monitor • AAA-DZZ designation for US tubes • EAA-HZZ – European tubes • JAA-MZZ – Japanese Tubes • X – represent a color picture tube example of WTDS A6AAAOOX

  6. Picture tube length and deflection Angle • Length 9 – 25 inches • 50- 114 degrees deflection angle • 105 degrees horizontal deflection angle

  7. Picture tube bases

  8. Picture tube parts

  9. Electrostatic focus

  10. Picture tube PS

  11. Flat picture tube

  12. Porta TV

  13. Gun Arrangement

  14. Problem and Symptoms • Low picture clarity • No picture filament light ok high voltage ok • Picture tube face turn to white • Black spot on the middle of the picture tube • Low phosphor • Blurred picture

  15. Tube testing • Isolation technique • Picture tube tester • Variable Filament voltage supply • Observation and analysis • Second opinion

  16. Picture Tube Replacement • Cost effectiveness • Availability • Substitution (use tube manual) • Picture tube size • Brand • Model number or serial numbers • Structure and mounting • Make or production code