T'shooting Dead 595 -- Found a Smoked Transistor

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T'shooting Dead 595 -- Found a Smoked Transistor

Postby lothian » July 21st, 2018, 12:11 pm

My 595 collided with a water bowl. The thing went quiet after the crash, and that got my attention. I found the Roomba completely unresponsive, and with curl of smoke rising from the control bezel. Smash-cut to a fully-disassembled Roomba strewn across my work table.

With the help of a magnifying glass, I believe I've identified one--and only one--obviously smoked component: a transistor, Q79 on the mobo (see attached images).

Image

Image

My plan, of course, is to replace this transistor with identical--hopefully, that effort is all that's necessary to revive this appliance in lieu of doing a wholesale mobo swap. I have no idea what the specs are for this component. And so I turn to this forum. Any assistance is appreciated.
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Re: T'shooting Dead 595 -- Found a Smoked Transistor

Postby a1robotrepair » July 21st, 2018, 1:14 pm

That board is water damaged.
Highly unlikely you will be able to resurrect it.
Q79 is the switched transistor for the vacuum bin.
Replacing it will not cure your problems.
A 560 light early 650 main board may fix your problems.
Search this forum for testing the modules, CHM, Wheel, Bin and Side Brush / Front Brush.
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Re: T'shooting Dead 595 -- Found a Smoked Transistor

Postby lothian » July 26th, 2018, 9:10 am

Thanks for the response.

I'd like to swap in a new transistor prior to t'shooting the board. Do you happen to know the specs for this specific component? Optionally, do you have one laying about you can offer?
lothian
 
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Re: T'shooting Dead 595 -- Found a Smoked Transistor

Postby a1robotrepair » July 29th, 2018, 12:56 pm

It is the bin power transistor.
Your picture shows at least 1 bad capacitor.
The traces from the power diodes look bad.
Q79 is a S8050.
Roses are red Violets are blue Poems are hard Flowers and Chocolate
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