p719 Neckboard Transistor

cjberg

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Looking for a replacement p719 neck board, but in the mean time I think the transistor for the green might be bad? I have red & blue, but no green. Does anyone know the part number or specs for the transistor? I want to try to install a new one and see if I can get color.

The numbers on the transistor are C3782 d8f4 but I can not cross reference those to anything.

Cj
 
try swapping the blue for green first to see if the blue goes away. it could be something else.
 
the traces lift from the heat put out by these. eventually handling the chassis and the heatsinks flopping around you could possibly tear the solder pads off. I have a 719 guide in my signature, it's for showing how you can anchor the transistors in place so they don't flop around anymore, but you'll have to do your own trace repairs first if that's the case.

you can do diode checks with a meter, start from the 3 legs of each transistor and work your way outward. in fact, I would do the next points in the circuit just to make sure everything is working in-between.

when you're all done, there's 3 large resistors below those transistors. spreading them out so they're not on top of each other will reduce the heat I've found.
 
Thank you for your suggestions and help. I have located some of the transistors, so should be able to get those. I put my meter on the transistors, resistors and found that the green transistor is "bad". I need to pull the transistor to verify for sure.

The traces on the back of the board are fried, I have already had to put in jumper wires for the red. Im looking for a replacement board, but for now want to get this one up and running.
 
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