25" Sharp TV blows fuse

[Randy]

I have a 25" Sharp TV that keeps blowing the fuse. I found a shorted
horizontal output transistor and replaced that. As soon as I hit the power
button on the set it shorted the horizontal output transistor again and blew
the fuse. There's a part right next to the horizontal output transistor that
looks like a diode but is listed on the schematic parts list as a "ferrite
bead". It also seems to be shorted out. What exactly is a ferrite bead?
Would this part be shorting out the horizontal transistor or is there
something downstream that I should check for that would be shorting out both
of these parts?

 

[David]

How can we politely say: From your posting it definitely appears that you
are in over your head at this point in time. It would benefit you greatly
to find some of the older books, library maybe, that covers the basics of tv
troubleshooting and repair. It would be of even greater benefit to have on
hand an experienced technician on hand as a mentor during your learning
curve.

Did you perform the basic standard tests and waveform analysis before
replacing the HOT to try and determine why it shorted in the first place?
i.e Flyback ring test, HOT drive waveform, Regulated B+ voltages, etc
I am sure that once you find the answer to this question with some research,
that you will be able to properly troubleshoot and find the root cause of
the failure.

BTW does this set have a hot chassis? Make sure you take the appropriate
safety precautions if it does. i.e. isolation transformer.

www.repairfaq.org has a nice section on safety plus troubleshooting
information and resource links.

David