I have an 8 input 8 output SMS controller that I got the other day (expensive) I got it all configured spot on then I decided to short out one of the outputs (output 1) of which made a cracking noise. Now the output is staying permanantly on.
I am wondering if this is repairable as of the below pictures (see red arrow going to component with hole in) the component thats blown is labelled J3Y of which might be a transistor?
I am not sure if these kinds of boards can be hand soldered or even if its possible to get a replacement component with the limited amount of info i.e J3Y and no circuit diagram etc
The controller is a RTU5011, 8 input, 8 output SMS controller made by the Chinese company King Pigeon
The other relay controlable outputs seem to work fine still its just output 1 (the rest are 0,2,3,4,5,6,7)
I need all 8 outputs to do with it what I have planned.
The said BC817 would be a perfect replacement, there are many others suited as well.
The transistor can be easily desoldered by heating and lifting the single collector pin first, then the others. Solder wick can help but isn't necessarily required. You mainly should take care not to overheat the board and lift of pads by pulling too much.
The said BC817 would be a perfect replacement, there are many others suited as well.
The transistor can be easily desoldered by heating and lifting the single collector pin first, then the others. Solder wick can help but isn't necessarily required. You mainly should take care not to overheat the board and lift of pads by pulling too much.
The transistor specification is very similar, but it hasn't to be exactly identical. It has to fulfill the current and voltage rating and minimum required current gain for your application. Suitable transistors can be get from an electronic DIY shop, or mail order and online suppliers in your region. The price of 10 is about a small postage stamp's equivalent.
The transistor specification is very similar, but it hasn't to be exactly identical. It has to fulfill the current and voltage rating and minimum required current gain for your application. Suitable transistors can be get from an electronic DIY shop, or mail order and online suppliers in your region. The price of 10 is about a small postage stamp's equivalent.
The SMD code J3Y is for transistor S8050 There is no problem to put BC817 instead. There is almost zero chance the microcontroller to be damaged - it's connected to the transistor through resistor.
You can easy desolder and solder a new BC817 transistor using an ordinary soldering iron.
In fact, any NPN transistor with SOT23 footprint would do the job.
I think the transistor is only use for I/O purpose.