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When the two wires touched the short overheated and blew the output transistor or transistors. The unit needs to be repaired or replaced. It only takes a momentary touch of the wires to blow the output transistor. It is not a fault of your particular amp. It is common to all Solid State amps. Tube amps that have output transformers are not susceptible to this problem. Always shut off the amp when connecting or disconnecting the wires.
gwm_inc, Please verify all speakers work or are not shorting the outputs of this Yamaha 100w/ch amp. Also this unit could have bad capacitors and or failed output transistors if the speaker terminals or connecting cables get shorted. I would guess that the power supply is detecting a FAULT condition and is shutting itself down to prevent a catastrpohic, nonrecoverable failure event!! Best shot would be to have a technician evaluate unit. 12fixlouie
If you are sure your speakers are good. This unit has a protect circuit keeping the unit from turning on. This recevier uses an ic instead of output transistors. A ic incorperates transistors,resistors,capactors in one assembly for size and costs. There is a number right on the front of the ic ,you can go on-line to buy the ic is is fairly easy to put in as long as you can desolder and solder in.
This usually means an output transistor is shorted and the amp is protecting itself. There are usually 2 8 amp fuses GMA type (glass tube) that are located near the large transformer on the main board that also get blown. You can try the fuses and see if it fixes it (10% of the time it will). If they blow again, it will be one or more output transistors are shorted, and the unit will need professional repair.
This is an inverter board problem. The inverter supplies the high voltage and frequency to run the CCFL backlights. The board has a sensing circuit to shut down the output if too much current is going to the backlights or it will shut down if the transistors overheat. I have replaced transistors on some boards with higher rated transistors and they have worked great for years. Sometimes it is just a cold solder joint on the inverter board. Replacement boards are expensive but not too difficult to replace. Repair requires some ability with electronic boards and should not be attempted if you do not posess the skill. You could end up damging other parts that cost more.
If the set runs at all, your flyback and output transistor are good. If the set shuts down after a few seconds and the sides are wavy, it usually means that the main B+ in your power supply is too high and not regulating properly. I do not know what kind of power supply that model uses, but if has an old-style STR regulator (like the STR30130) then it is probably shorted, and if the set uses a switching power supply then look for an open or leaky electrolytic cap on the primary side. If the power supply is working correctly and the set shuts down, check for an open safety cap (the large 1.6 - 2Kv cap connected to the collector of the horizontal output transistor).
The audio output ICs or transistors are blown. Solid state elctronics are not very forgiving when they are shorted. it takes one tiny instantance and the componets will fry. sorry to be the bearer of bad news but you will need to have this unit serviced or replaced, And never ever work on any type of electronics with the power still on. Good Luck