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Since the horn wire is just a ground for the horn relay there must be a hole worn in the insulation of the horn wire and that is grounding to the chassis when you use the turn signal switch. no other explanation.
Check all the other components, at related SMPS circuit, for any loose solder terminals. Check and replace damaged component/s at it main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis.
Short circuited component/s at its min power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. http://electronicshelponline.blogspot.com/
Hello Dyan, Hi you can find one at any electrical or electronics shop that sells spare parts, But mind you the reason why the fuse blows in the first place, have the power supply board checked for shorts such as a shorted switching regulator. If in the event the replacement fuse blows again, there is definitely a shorted part. Have this checked by a technician.
check around your diodes near the voltage regulation area for either a very bad diode or a direct short sometimes its near the resistor pack and very hard to see. But if it were me I would just change out the power supply and be done with it.
you need to look on the right side of the set (facing the front of the set) for a small label that says model code... serial number.. version.. if the version number is blank or PW01 you have the L3 chassis. if it says PU02 then you have the L620 chassis also the L3 chassis has the ballast on a slight angle and the L620 has the ballast straight.
there is a short somewhere-try disconnecting all components on that circuit,put new fuse and try using one,if the fuse still blows,problem is in wiring or switch unit,if not,plug one component in and a time until the fuse blow,replace component
accordingly.make sure there is no slightly shaved wire touching the chassis,this will show when all if d/c'ed and fuse still blows,good luck