Hi Lwandile,
Yes, usually would not blow a fuse, it only cause power supply not to start up (shutdown mode). If there is a protection fuse along the B+ line then it would usually open circuit.

Jestine

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Am I correct if I say that the Horizontal Output Transistor (HOT) has nothing to do with a blowing fuse of a Cathode Ray Tube television's (CRT TV) SMPS, sir?

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Hi Tyrone,

The part number is written on top of the transformer. Please visit the link below to check why HOT always burnt:

https://jestineyong.com/why-horizontal-output-transistor-in-crt-monitor-get-shorted/

Jestine

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Hi Bizimungu,

I suggest that you check all the components in the power primary and secondary output side. If all components checked to be good then direct replace the power IC and retest.

Jestine

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my crt tv(sharp) fails to turn on.for the first time,the fuse blew out,,when i replaced another it also had blown as well,,,then i started troubleshooting,(in SMPS power supply) i saw a switching transistor whose pins were shorted, i replaced it,as well as it's closest transistor(high beta) but then,the fuse could no longer blow out,as it was before,,,but still the tv is not yet on,,,a smoothing capacitor has no symptoms.

i wonder your help please

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Hi Dalganjan,

Vertical shaking can be caused by many factors. If I did not see the TV display problem myself, it is hard to tell where should start first. It can be caused by bad vertical oscillator ic, unstable dc supply output voltage from power supply, dry joints, bad components and etc.

Jestine

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Hi Kayden,
Yes, only the replacement of the transformer solved the problem and no other components found to be faulty.

Jestine

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