Schematics

[gombary]

HELLO PLEASE I NEED A LITTLE FAVOR I NEED SSP-3100G schematic U THE TRANSISTOR THIS HAS BEEN LIGHTNING AND THANKS FOR EVERYTHING FRIENDS

[Vadim18]

Hi gombary!
And for now your detector did not work at all? Or still work, but without sound?
It seems like this transistor do on/off switch function, for me it all looks like somebody conect battery in wrong polarity.
This transistor may be BD140 or BD139 i dont know.

Need foto at bottom and top of pcb, only around burned transistor place.
And can you read marking code of this parts

[gombary]

you are very good vadim, yes it works, but without sound

and true the battery charger has been connected with the wrong polarity

[gombary]

see these

[6666]

If you google images of bd139 and 140 they show they end in a 9 or a 0 this tranny looks like it ends in a 2, can you measure anything with a multimeter between the two pins

[Vadim18]

Thanks gombay, thanks for your photos. Now we closer to proper answer.
Im take a try to understand.

[gombary]

let's hope Vadim

[gombary]

I don't understand what you mean 6666

[Vadim18]

Im not shure by 100%, but this secret transistor may be SD882 or SD772.


Check somehow speaker, maybe speaker driver also burned.

[gombary]

ok thanks Vadim, I try all 3 transistors and then I will let you know, you have been very kind, thanks

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speaker driver burned would be which one on the pcb

[Vadim18]

Ok, first check SD882. Likely most this is SD882 transistor, not SD772

Before you place new transistor can you measure voltage betwen "+Vcc" and "-Bat" points, i marked them on photo
This is Speaker driver
And be aware - I may be wrong. You still have all chances to fully damage your unit, dont rush.
So better if one of forum users confirm my conclusions.

[gombary]

measure the voltage between the points "+ Vcc" and "-Bat" --- and 10.81V
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[gombary]