L&M Sola 3600 repair

[toto44182]

Hi everybody,

Due to cracks on the plastic cover of the light, this leaks during dive...
Not identified before...

So I will replace the body and I'm trying to repair the board.


I first remove the residue of oxydation thanks a paintbrush and a small component has unsoldered.
The ref is Q600 so I guess it's a transistor

On my second dive light, Q600 is marked "PA1EN".

Is somebody able to know what type of component Q600 is (Mosfet, NPN, PNP, or ??) ?

Thank you in advance

 

[esmIII]

Top markings on SMD compnents suck. If its a BJT you can figure out what it is using the diode mode of your multimeter. A PNP will have diodes pointing towards the base and a NPN will have diodes pointing away from the base. If its a mosfet it will be a bit harder. I usually use a Peak Atlas DCA55, to figure out what type of component I am looking at. The top pin looks like its going to a power rail. If I had to take a guess its a PNP or p channel fet being used to switch Q601. But its really hard to judge with out high resolution picks of the top and bottom

 

[runsongas]

did you talk to L&M about repair options first even if out of warranty?

 

[toto44182]

did you talk to L&M about repair options first even if out of warranty?

Yes I agree with your idea.

 

[toto44182]

Some news :
No information provided by L&M on the replacement part. "our lights are proprietary and we are not able to disclose sensitive information on assembly parts"
So I can understand their point.
The 3600+ are no longer produced and replaced by the 3800. As I'm in France, this is more complicated to replace the board and assumed expensive.

Anyway,

Thanks to the second light, I was able to measure electrical points around Q600.
1/ Q is for Transistor.
2/ 0.8V between Pins 1-3 and not between Pin 2 and another. So not possible to be a bipolar.
3/ The voltage on pin 1 changes from 3,3V to 0V. This indicates the switch is between 1 and 3. 2 is the command.
So I conclude, this is a PMOS with diode.

Then, using the marking code, I was able to confirm PA1EN
PA1 is for this DMG1013UW is SOT323 package.
E is for year 2017
N for November.

Next steps :
Order it
Test it