The board has likely become conductive and will have to be partially cut away to break the conduction. There are many ways to do that, milling bit, drilling, acrylic scoring knife, razor knife...
Q124 and Q125 are in parallel so both of those will need to be replaced as they always should. Install Q124/5 with long leads so that the body of the transistors will be close to the fan, for better cooling.
Q124 and Q125 are in parallel so both of those will need to be replaced as they always should. Install Q124/5 with long leads so that the body of the transistors will be close to the fan, for better cooling.
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What is D114 part number on the same audio driver board?
The transistors I removed checked fine on the multimeter and the resistor even though heavy discolored (burnt), it was still in tolerance, any given reason for that?
What noticed on these boards also the board legend as C191 for the resistor in that area, any specify reason for this?
The transistors I removed checked fine on the multimeter and the resistor even though heavy discolored (burnt), it was still in tolerance, any given reason for that?
What noticed on these boards also the board legend as C191 for the resistor in that area, any specify reason for this?
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It's generally a 5.6vZ (1N5232) but is sometimes a 6.2v Zener. They rarely fail. Did the one in your amp fail?
Look at how it's being used in the circuit. It's connected to the same components as in the other driver board. Look ad D8 in the following diagram (same basic circuit).
http://www.bcae1.com/temp/sony - XM-D400P5_Car Power Amplifier SM.pdf
http://www.bcae1.com/temp/sony - XM-D400P5_Car Power Amplifier SM.pdf