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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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25" Sharp TV blows fuse
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? |
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25" Sharp TV blows fuse
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 Randy wrote in message ... 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? |
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