Duo R Left audio transistor burned out. Is this fixable?

[Sega90s]

I noticed no audio was coming from the left channel on the Duo R so I opened it up and found this.

Is this fixable?

[kamiboy]

Wow, but yeah, if you trace the connections you can fix it.

[Sega90s]

I guess its time to break out the fiberglass pen. Does this transistor need to be specific and if so how do I find the value?

[maxtherabbit]

I guess its time to break out the fiberglass pen. Does this transistor need to be specific and if so how do I find the value?

Hope someone who has a duo sees this thread and can open theirs up and tell you what q604 is

[FBX]

I guess its time to break out the fiberglass pen. Does this transistor need to be specific and if so how do I find the value?

Hope someone who has a duo sees this thread and can open theirs up and tell you what q604 is

I would just look at the transistor for the right channel. Logically it should be the same as the left channel's.

[Sega90s]

I will try and take a better picture(less blurry) to get the number of the right channel transistor. I guess I would want to make sure the gains match between both channels.

[Sega90s]

The number I got off the other transistor is a Motorola p50 . Unfortunately I can not find a data sheet and no way to source it. Does anyone know of another suitable replacement? For now I just have it routed directly to the out put off the R607 resistor and besides being lower volume it doesn’t sound bad.

[arithmaldor]

I've narrowed it down to the correct package (I think) and specs (maybe):
https://www.mouser.com/Semiconductors/D ... =Pricing|0
I don't know what impact any of the other characteristics have, but hopefully it's enough to get you started.

[Sega90s]

I guess I will try and prob the voltage values to see if I can get something close to the original and order one of those
from the link. Fixing the torn/lifted traces is going to be a whole other pleasurable experience. At least for now I have audio just not the right volume. Times like this I wish I had taken electrical engineering instead of computer science.

[FBX]

Fixing the torn/lifted traces is going to be a whole other pleasurable experience. At least for now I have audio just not the right volume. Times like this I wish I had taken electrical engineering instead of computer science.

I'm sure it's just a matter of repairing the 'road work'. You may end up having to solder some wires to the last stable areas of the traces if burnt material goes through the board. In which case, it might be worth designing a small patch board in Eagle. It just depends on how bad it is. Show us a pic after you remove the burnt transistor (if you can).

[Sega90s]

The transistor pretty much disintegrated, and after cleaning some of the charred area the traces / pads lifted off the board. Your probably right in that I’ll have to build a separate circuit and wire it to points further back. I waiting on a fiberglass pen to remove the remaining burned black area and will take a picture after it’s cleaned. I will also take a picture after it’s fixed and document all components needed.