Fuse blows when plugged in. Found a bad transistor, guess it is the horizontal output. it is stamped p5nk50zfp gk180 v6 chn 607. The #'s don't seem to match when I try to search to get a replacement. I need the part # and or where I can purchase a replacement transistor.
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Replace its Horizontal output Transistor. If the base-emitter junction has a leak inside it, this type of fault will occur. Before replacing it, check the main DC voltage to LOT [Line Output Transformer]. It should come around 102VDC. If there is not this much voltage, check the electrolytic filter capacitor connected across thie supply line to main negative for open or value developed. Replace the same is good. Till there is low voltage found, check the retifier diode that rectifies this 102 volt DC. If all the above are OK and still you get a stamp like raster, check the heat of the Horizontal Output Transistor described above. if it overheats, LOT is defective and should be replaced with same type and number. OK.
The only suggestion i have is that you could have a defective flyback transformer if still not turning ON.
You should check B+ voltage and see if it gets to the horizontal transistor, if it does; chances are that the flyback is defective on this TV.
I looked for an schematic, but no luck find one. Looks like they do not exist.
I could not find anything schematic for your TV.
I would suggest to check the horizontal transistor, if the transistor is OK; check the voltage at the collector. NOTE: be very careful when measuring this voltage, you should get about 130 VDC.
If that voltage is present, you might have a defective flyback transformer.
I will say that this part is shorted if it measures continuity on all the leads regardless on how you tested.
Was this mosfet nearby the power supply circuitry?
You can also check the horizontal output transistor that is mounted on a heatsink near the flyback transformer.
do not put another fuse because there is a shorted in either the power supply circuit or the horizontal deflection circuit. in power supply try to check the rectifier, filter capacitor, or the regulator ic/transistor. in horizontal, try to check the horizontal driver/
output transistor or the flyback transformer. good luck! but if u dont know anything about this much better to bring it to a qualified service technician. good luck!
A 10 year old RCa most likly has a bad Horizontal output transistor as well as the main High Voltage transformer and The transformer is no lonmger available from RCA. The replacement wont last longer then a year if your lucky. My advice on a set this old ?? Buy a newer one!!