What's the part number for this transistor?

I'm working on my friend's 53" Sony TV and it needs a transistor. The model number is KP53S15. This transistor is on the E board. The location number of this part is Q913. I don't have the service manual for this tv so I can't look up the part number. The number on the transistor says C124 and below it says E.S U. All this tv does is turn on for a few seconds, not enough for the picture to come on, and shuts off. The standby light just blinks continously until the power button is pressed. When I manually trip the relays on the power board and the set turns on and only stays on when held - shuts off when let go. I'm guessing this transistor is part of a protection circuit. I have a electronics store a few miles from my house and it would be easier to get it from there instead of Sony Direct. Any help would be appreciated. Thanks.

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